CCSM Advanced VPN Troubleshooting — All Questions With Answers

Question 1hardmultiple choice

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During site-to-site VPN troubleshooting, you suspect Phase 1 IKEv2 negotiations fail due to unsupported proposal parameters. Which debug command isolates IKEv2 negotiation failures in Gaia OS?

Question 2mediummultiple choice

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A remote access VPN user authenticates successfully via RADIUS, but fails to reach resources behind the Security Gateway. SmartView Tracker shows traffic dropped due to 'Encrypt rule match'. What is the most likely cause?

Question 3mediummultiple choice

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When troubleshooting a certificate-based VPN tunnel, the Security Gateway rejects the peer certificate. Which command verifies the certificate revocation status and trust chain on Gaia OS?

Question 4mediummulti select

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Which TWO of the following are valid ways to verify that a site-to-site VPN tunnel is up?

Question 5mediummulti select

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Which THREE of these are common causes for VPN tunnel re-key failures?

Question 6mediummultiple choice

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Refer to the exhibit. After running these commands, where should the administrator check for the captured IKE debug information?

Exhibit

vpn debug ikeon
vpn debug filter 10.10.10.5
vpn debug on

Question 7mediummulti select

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Which THREE factors must be identical on both VPN peers for a successful IKE Phase 1 negotiation?

Question 8hardmultiple choice

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A Security Gateway in a large enterprise manages several hundred IPsec site-to-site tunnels. After enabling a new policy package, the administrator notices that a specific remote peer's tunnel repeatedly drops and re-establishes every few minutes, while other tunnels remain stable. The logs show 'IKE: Quick Mode completion' followed shortly by 'IKE: SA deleted' for that peer only. The peer's VPN domain overlaps with a newly added internal network object. What is the most likely cause of the repeated tunnel teardown?

Question 9mediummultiple choice

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A Check Point R81 gateway is configured with a route-based VPN (VTI) to a remote peer. The tunnel is up, but traffic from the local network is not being encrypted. The administrator confirms that the VTI interface is up and the static route to the remote network points to the VTI. Which additional configuration is required on the Check Point gateway to encrypt traffic over the VTI?

Question 10mediummultiple choice

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A Check Point administrator is troubleshooting a VPN where some packets are being dropped due to 'IPsec packet replay' errors. The VPN is between two Check Point gateways, and the administrator has verified that the Phase 1 and Phase 2 settings match. What is the most likely cause?

Question 11hardmulti select

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A Check Point Security Gateway is configured for route-based VPN with multiple tunnels to different peers. Users report intermittent connectivity to resources across the VPN. The administrator suspects that the issue is related to tunnel selection or routing. Which two actions should the administrator take to troubleshoot the tunnel selection process? (Choose two.)

Question 12hardmulti select

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A Check Point administrator is troubleshooting a VPN where a site-to-site tunnel fails to establish. The logs show 'IKE Phase 1 Main Mode failed'. Which TWO actions should the administrator take to troubleshoot this issue? (Choose two.)

Question 13hardmultiple choice

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A Check Point R81 cluster is configured for permanent site-to-site VPN tunnels to three branch offices. The administrator notices that one tunnel is constantly flapping and the logs show repeated 'IKE: Quick Mode completion' followed by 'IKE: SA deleted' messages. The branch office firewall is a different vendor. Which action is the most appropriate first troubleshooting step?

Question 14mediummultiple choice

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A Check Point administrator notices that a site-to-site VPN tunnel between two gateways rekeys successfully but then drops data traffic for several seconds during each rekey. The administrator wants to reduce or eliminate this interruption. Which action is most appropriate?

Question 15hardmultiple choice

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A Check Point Security Gateway is configured for route-based VPN with a third-party peer. Traffic is not passing through the tunnel, and the administrator suspects an issue with the routing or the virtual tunnel interface. Which command should the administrator use to verify that packets are being routed into the VPN tunnel?

Question 16mediummultiple choice

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A Check Point Security Gateway logs IKE Phase 2 Quick Mode failures on a route-based VPN to a Cisco peer. The Phase 1 tunnel is up. The administrator suspects a mismatch in the Proxy IDs. Which Check Point command should be used to inspect the negotiated Phase 2 selectors for this tunnel?

Question 17mediummulti select

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An administrator is troubleshooting a site-to-site VPN where Phase 1 negotiations are failing intermittently. The logs show 'IKE Phase 1: Received notification INVALID_COOKIE'. Which two actions should the administrator take to resolve this issue? (Choose two.)

Question 18easymultiple choice

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A Check Point Security Gateway is configured for a star VPN community. The administrator needs to verify that the VPN tunnel to a satellite gateway is up and which encryption algorithms are in use. Which command should the administrator run on the Security Gateway?

Question 19hardmulti select

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A Check Point gateway in a Meshed VPN community intermittently fails to establish tunnels with one specific peer. The administrator suspects that the peer's IKE traffic is being dropped before it reaches the VPN daemon. Which TWO diagnostic steps should the administrator perform to confirm that IKE packets are arriving at the gateway and being processed? (Choose two.)

Question 20hardmultiple choice

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A Check Point Security Gateway is configured for Remote Access VPN with Office Mode. Users authenticate via LDAP and receive IP addresses from a pool. Some users report that they cannot access internal web servers, but they can access file shares. The administrator suspects that the issue is related to the Office Mode IP address assignment or routing. Which of the following should the administrator check first?

Question 21mediummultiple choice

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An administrator notices intermittent VPN tunnel drops between two Security Gateways. Phase 2 negotiations fail every 3600 seconds precisely. Which parameter mismatch most likely causes this behavior?

Question 22hardmulti select

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Which TWO actions should an administrator perform to troubleshoot a site-to-site VPN tunnel where traffic is dropped by Anti-Spoofing? (Choose TWO)

Question 23mediummulti select

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Which TWO logs or diagnostic outputs are most effective when troubleshooting Phase 1 VPN negotiation failures? (Choose TWO)

Question 24mediummultiple choice

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A remote access user is unable to connect via Mobile Access VPN. The logs show 'IKE Phase 1 Main Mode negotiations failed'. Which action should be taken to isolate the issue?

Question 25hardmultiple choice

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Refer to the exhibit. An administrator sees this log entry while troubleshooting a site-to-site VPN. What is the most efficient way to resolve this error?

Exhibit

IKE_DEBUG: [VPN] Proposal mismatch: Proposed: AES256-SHA256-DH14, Configured: AES128-SHA1-DH2

Question 26mediummulti select

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A user reports they can connect via Remote Access VPN but cannot access internal web servers. Which TWO steps should the administrator take to troubleshoot this routing or policy issue?

Question 27hardmultiple choice

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Refer to the exhibit. A user is getting this log. What is the most likely cause?

Exhibit

FW_Log: 'Encryption failure: Packet is dropped because of a Security Association mismatch.'

Question 28mediummultiple choice

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You are troubleshooting a VPN issue and need to verify if the packets are being encrypted by the gateway. Which tool is the most appropriate for this task?

Question 29hardmulti select

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Which THREE conditions must be met for a successful Site-to-Site VPN tunnel establishment?

Question 30mediummultiple choice

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What is the primary function of the 'vpn tu' command in a troubleshooting scenario?

Question 31hardmultiple choice

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Refer to the exhibit. Why would an administrator use these two commands together?

Exhibit

vpn debug ikeon
vpn debug on TDERROR_ALL_ALL=5

Question 32hardmultiple choice

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Refer to the exhibit. What is the most likely reason for this error?

Exhibit

IKE_DEBUG: [VPN] Peer identity mismatch: Expected: 192.168.1.1, Received: 10.0.0.5

Question 33mediummultiple choice

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What is the role of Perfect Forward Secrecy (PFS) in a VPN tunnel?

Question 34hardmultiple choice

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Refer to the exhibit. What is the most effective way to troubleshoot this IKE Phase 1 failure?

Exhibit

IKE_DEBUG: [VPN] IKE Phase 1: No proposal chosen.

Question 35mediummultiple choice

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A remote access VPN client reports intermittent connection drops. The gateway logs show 'IKE failure: Phase 2 proposal mismatch'. What is the most likely cause?

Question 36hardmulti select

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Which TWO of the following troubleshooting commands are most effective for isolating VPN traffic flow issues in the kernel?

Question 37hardmultiple choice

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A user is experiencing 'No valid SA' errors when attempting to send traffic over a site-to-site VPN. What is the most likely cause?

Question 38mediummultiple choice

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A VPN gateway is failing to initiate a tunnel. You suspect the peer is unreachable. Which command is most appropriate to verify connectivity at the network level before troubleshooting the tunnel?

Question 39hardmultiple choice

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Refer to the exhibit. The 'vpn tu' utility shows an IPsec SA status of 'Initializing'. What does this state indicate?

Exhibit

vpn tu
1. List all IPsec SAs
2. List all IKE SAs
3. Delete all IPsec SAs
4. Delete all IKE SAs
Select option: 1

Result:
Peer: 1.2.3.4
Status: Initializing

Question 40mediummultiple choice

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What is the primary purpose of the 'Perfect Forward Secrecy' (PFS) feature in Check Point VPN configurations?

Question 41hardmultiple choice

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During a VPN migration, a new gateway is failing to decrypt traffic from a legacy peer. The legacy peer uses older algorithms. How should you troubleshoot this?

Question 42mediummulti select

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Which TWO of the following are common reasons for VPN tunnel packet fragmentation?

Question 43hardmultiple choice

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A Check Point security gateway terminates an IPsec site-to-site VPN to a third-party peer. Phase 1 completes, but Phase 2 fails with 'Quick Mode completion failed'. The third-party peer requires AES-256/SHA-256 for Phase 2, but the Check Point gateway's IPsec VPN community is configured with AES-128/SHA-1. Which action resolves the mismatch?

Question 44hardmultiple choice

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A Check Point R81 cluster uses a route-based VPN with a VTI interface to a remote peer. Users report that tunnel traffic intermittently fails, and the administrator observes that the VTI interface state is DOWN even though IKE Phase 1 and Phase 2 report success in 'vpn tu'. Which action is the most appropriate next step?

Question 45mediummulti select

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An administrator is troubleshooting a Check Point Remote Access VPN where users authenticate via LDAP but are not getting an IP address from the gateway's IP pool. The logs show 'user authenticated' but no 'IP assigned' message. Which TWO actions should the administrator take to resolve this? (Choose two.)

Question 46mediummultiple choice

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An administrator notices that a site-to-site VPN tunnel between two Check Point gateways frequently renegotiates Phase 2, causing brief interruptions. The log shows 'IKE Phase 2 rekey failed' messages. Which of the following is the most likely cause?

Question 47easymultiple choice

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A Check Point administrator needs to verify whether IPsec traffic from a specific remote peer is being decrypted and passed to the internal network. The administrator has access to the gateway's command line. Which command provides a real-time capture of packets on the gateway's external interface, showing both encrypted and decrypted traffic?

Question 48hardmultiple choice

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A Check Point gateway is configured for Mobile Access VPN with Office Mode. Remote users authenticate successfully but cannot access internal resources; the logs show 'encryption failure' for packets from the Office Mode IP pool. Which of the following is the most likely cause?

Question 49hardmultiple choice

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A Check Point gateway is configured for IPsec VPN with a peer. The administrator notices that the tunnel goes down periodically and re-establishes. The logs show 'IKE Phase 2 rekey failed' followed by 'Tunnel down'. The administrator suspects a lifetime mismatch. Which action should be taken to resolve the recurring rekey failures?

Question 50mediummultiple choice

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A Check Point administrator is troubleshooting an IPsec VPN where Phase 2 negotiations fail with the error 'No proposal chosen'. The peer is a Cisco ASA. Both gateways are configured with AES-256 and SHA-256 for Phase 2. What is the most likely cause?

Question 51hardmultiple choice

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A Security Administrator has configured a permanent site-to-site VPN between two Security Gateways. The tunnel is up, but large file transfers intermittently stall while small pings and HTTP requests succeed. The administrator notices the peer gateways advertise an MSS of 1460 on their external interfaces, and no NAT is involved. Which Check Point action is the most appropriate to resolve this?

Question 52mediummultiple choice

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A Check Point Security Gateway in a site-to-site VPN environment is configured with multiple external interfaces. After a recent ISP change, the VPN tunnel intermittently fails to establish, and the logs show 'Received notification from peer: INVALID-ID-INFORMATION'. Which action should you take first to resolve this issue?

Question 53mediummultiple choice

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A security administrator is troubleshooting a site-to-site VPN between two Check Point Security Gateways. Phase 1 completes successfully, but Phase 2 fails with the error 'Quick Mode failed: no matching proposal'. The administrator has verified that the encryption and hash algorithms match on both peers. Which action should the administrator take next to resolve the Phase 2 failure?

Question 54mediummultiple choice

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An administrator is troubleshooting a site-to-site VPN where Phase 1 completes but Phase 2 fails. The log shows 'Quick Mode failed: no proposal chosen'. Which of the following is the most likely cause?

Question 55hardmultiple choice

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An administrator notices that a site-to-site VPN tunnel between two Check Point gateways intermittently drops and re-establishes. The logs show 'IKE Phase 2 rekey failed' followed by 'Tunnel deleted'. What is the most likely cause?

Question 56mediummultiple choice

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A remote access VPN user authenticates successfully with a certificate, and IKE Phase 1 completes, but the tunnel drops immediately after Phase 2 starts. The gateway logs show that the user's certificate has been revoked. Which Check Point component should the administrator verify first to confirm the revocation status?

Question 57hardmultiple choice

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A Check Point Security Gateway is configured for route-based VPN using VTI interfaces. Users report that traffic to a remote subnet is not being encrypted, even though the VPN tunnel is up. The routing table shows the correct route pointing to the VTI interface. Which tool would you use to verify whether packets are being encrypted and sent through the tunnel?

Question 58easymultiple choice

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A remote access VPN user reports that they can connect to the Check Point Mobile Access portal but cannot access internal resources. The administrator checks the logs and sees that the user is assigned an IP address from the VPN pool, but no traffic is being decrypted. Which tool should the administrator use to verify whether the user's traffic is being encrypted and decrypted correctly?

Question 59hardmulti select

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An administrator is troubleshooting a Check Point VPN where a site-to-site tunnel is up, but some traffic is not being encrypted and is sent in clear text. The administrator suspects that the encryption domain is misconfigured. Which two actions should the administrator take to verify and resolve this issue? (Choose two.)

Question 60mediummultiple choice

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A Check Point Security Gateway is configured for a site-to-site VPN with a third-party gateway. The tunnel is up, but users cannot access resources across the VPN. You suspect a Phase 2 (IPsec) issue. Which of the following would you check first to ensure that the encryption domains are correctly configured?

Question 61hardmultiple choice

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A Check Point Security Gateway is experiencing intermittent VPN tunnel failures. The logs show 'Phase 2 completion failed' with the reason 'No proposal chosen'. Which of the following is the most likely cause?

Question 62hardmultiple choice

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An administrator is troubleshooting a site-to-site VPN between two Security Gateways. Phase 1 completes, but Phase 2 fails immediately. The administrator runs 'vpn debug ikeon', reproduces the failure, and inspects $FWDIR/log/ike.elg. The log shows 'Received notification from peer: NO_PROPOSAL_CHOSEN'. Which action should the administrator take next?

Question 63mediummulti select

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A Check Point Security Gateway is configured for a site-to-site VPN with a Cisco ASA. The tunnel is up, but traffic is not passing. You suspect a Phase 2 issue. Which TWO of the following should you check to resolve the problem? (Choose two.)

Question 64mediummultiple choice

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A remote access user reports that the Mobile Access VPN client connects, but internal web applications are unreachable. The administrator confirms the user authenticates successfully and receives an IP address from the Office Mode pool. Which action should the administrator take to diagnose why traffic is not reaching internal resources?

Question 65easymultiple choice

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A Check Point administrator needs to verify that VPN traffic is being encrypted and decrypted correctly on a Security Gateway. Which command should the administrator use to view the current IPsec SA details?

Question 66hardmulti select

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An administrator is troubleshooting an IPsec VPN that intermittently drops large file transfers while small pings succeed. The gateways are Check Point Security Gateways running R81.20. Which TWO actions should the administrator take to identify and resolve the issue? (Choose two.)

Question 67mediummultiple choice

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A remote access VPN user authenticates successfully with a certificate but cannot access internal resources. The Security Gateway logs show 'IKE Phase 2: No valid SA' and the user's client reports 'Failed to establish tunnel'. The gateway's VPN community uses AES-256 and SHA-256 for Phase 2. Which of the following is the most likely cause?

Question 68hardmultiple choice

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An administrator is troubleshooting a VPN where the Security Gateway logs show 'encryption failure: packet is dropped' for traffic from a specific subnet. The administrator confirms that the subnet is included in the VPN domain and that the firewall rule allows the traffic. Which action should the administrator take next to identify the cause?

Question 69hardmultiple choice

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An administrator configures a Star VPN community between a Check Point R81 gateway and a third-party peer. Phase 1 and Phase 2 complete, but the remote peer reports receiving packets with a source IP that does not match the negotiated selector, causing them to be dropped. The Check Point gateway shows the tunnel as up. Which Check Point mechanism is most likely rewriting the source address before encryption?

Question 70mediummultiple choice

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Users on a Check Point Remote Access VPN intermittently lose connectivity. The gateway logs show 'Phase 2 completion' followed shortly by 'rekey' messages, and the issue correlates with periods of high latency. Which Check Point setting should the administrator adjust to reduce the frequency of rekey-related drops on high-latency links?

Question 71easymultiple choice

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A Check Point administrator needs to confirm which encryption and hashing algorithms were actually negotiated for an established site-to-site VPN tunnel, because the peer reports a weaker algorithm than expected. Which Check Point command provides the negotiated IPsec SA parameters?

Question 72mediummultiple choice

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A Check Point Security Gateway is configured with a site-to-site VPN to a third-party gateway. The administrator notices that the VPN tunnel goes down and comes back up every hour. The logs show 'IKE Phase 2 rekey failed' just before the tunnel drops. Which of the following is the most likely cause of this rekey failure?

Question 1hardmultiple choice

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During site-to-site VPN troubleshooting, you suspect Phase 1 IKEv2 negotiations fail due to unsupported proposal parameters. Which debug command isolates IKEv2 negotiation failures in Gaia OS?

Question 2mediummultiple choice

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A remote access VPN user authenticates successfully via RADIUS, but fails to reach resources behind the Security Gateway. SmartView Tracker shows traffic dropped due to 'Encrypt rule match'. What is the most likely cause?

Question 3mediummultiple choice

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When troubleshooting a certificate-based VPN tunnel, the Security Gateway rejects the peer certificate. Which command verifies the certificate revocation status and trust chain on Gaia OS?

Question 4mediummulti select

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Which TWO of the following are valid ways to verify that a site-to-site VPN tunnel is up?

Question 5mediummulti select

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Which THREE of these are common causes for VPN tunnel re-key failures?

Question 6mediummultiple choice

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Refer to the exhibit. After running these commands, where should the administrator check for the captured IKE debug information?

Exhibit

vpn debug ikeon
vpn debug filter 10.10.10.5
vpn debug on

Question 7mediummulti select

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Which THREE factors must be identical on both VPN peers for a successful IKE Phase 1 negotiation?

Question 8hardmultiple choice

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A Security Gateway in a large enterprise manages several hundred IPsec site-to-site tunnels. After enabling a new policy package, the administrator notices that a specific remote peer's tunnel repeatedly drops and re-establishes every few minutes, while other tunnels remain stable. The logs show 'IKE: Quick Mode completion' followed shortly by 'IKE: SA deleted' for that peer only. The peer's VPN domain overlaps with a newly added internal network object. What is the most likely cause of the repeated tunnel teardown?

Question 9mediummultiple choice

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A Check Point R81 gateway is configured with a route-based VPN (VTI) to a remote peer. The tunnel is up, but traffic from the local network is not being encrypted. The administrator confirms that the VTI interface is up and the static route to the remote network points to the VTI. Which additional configuration is required on the Check Point gateway to encrypt traffic over the VTI?

Question 10mediummultiple choice

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A Check Point administrator is troubleshooting a VPN where some packets are being dropped due to 'IPsec packet replay' errors. The VPN is between two Check Point gateways, and the administrator has verified that the Phase 1 and Phase 2 settings match. What is the most likely cause?

Question 11hardmulti select

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A Check Point Security Gateway is configured for route-based VPN with multiple tunnels to different peers. Users report intermittent connectivity to resources across the VPN. The administrator suspects that the issue is related to tunnel selection or routing. Which two actions should the administrator take to troubleshoot the tunnel selection process? (Choose two.)

Question 12hardmulti select

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A Check Point administrator is troubleshooting a VPN where a site-to-site tunnel fails to establish. The logs show 'IKE Phase 1 Main Mode failed'. Which TWO actions should the administrator take to troubleshoot this issue? (Choose two.)

Question 13hardmultiple choice

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A Check Point R81 cluster is configured for permanent site-to-site VPN tunnels to three branch offices. The administrator notices that one tunnel is constantly flapping and the logs show repeated 'IKE: Quick Mode completion' followed by 'IKE: SA deleted' messages. The branch office firewall is a different vendor. Which action is the most appropriate first troubleshooting step?

Question 14mediummultiple choice

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A Check Point administrator notices that a site-to-site VPN tunnel between two gateways rekeys successfully but then drops data traffic for several seconds during each rekey. The administrator wants to reduce or eliminate this interruption. Which action is most appropriate?

Question 15hardmultiple choice

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A Check Point Security Gateway is configured for route-based VPN with a third-party peer. Traffic is not passing through the tunnel, and the administrator suspects an issue with the routing or the virtual tunnel interface. Which command should the administrator use to verify that packets are being routed into the VPN tunnel?

Question 16mediummultiple choice

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A Check Point Security Gateway logs IKE Phase 2 Quick Mode failures on a route-based VPN to a Cisco peer. The Phase 1 tunnel is up. The administrator suspects a mismatch in the Proxy IDs. Which Check Point command should be used to inspect the negotiated Phase 2 selectors for this tunnel?

Question 17mediummulti select

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An administrator is troubleshooting a site-to-site VPN where Phase 1 negotiations are failing intermittently. The logs show 'IKE Phase 1: Received notification INVALID_COOKIE'. Which two actions should the administrator take to resolve this issue? (Choose two.)

Question 18easymultiple choice

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A Check Point Security Gateway is configured for a star VPN community. The administrator needs to verify that the VPN tunnel to a satellite gateway is up and which encryption algorithms are in use. Which command should the administrator run on the Security Gateway?

Question 19hardmulti select

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A Check Point gateway in a Meshed VPN community intermittently fails to establish tunnels with one specific peer. The administrator suspects that the peer's IKE traffic is being dropped before it reaches the VPN daemon. Which TWO diagnostic steps should the administrator perform to confirm that IKE packets are arriving at the gateway and being processed? (Choose two.)

Question 20hardmultiple choice

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A Check Point Security Gateway is configured for Remote Access VPN with Office Mode. Users authenticate via LDAP and receive IP addresses from a pool. Some users report that they cannot access internal web servers, but they can access file shares. The administrator suspects that the issue is related to the Office Mode IP address assignment or routing. Which of the following should the administrator check first?

Question 21mediummultiple choice

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An administrator notices intermittent VPN tunnel drops between two Security Gateways. Phase 2 negotiations fail every 3600 seconds precisely. Which parameter mismatch most likely causes this behavior?

Question 22hardmulti select

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Which TWO actions should an administrator perform to troubleshoot a site-to-site VPN tunnel where traffic is dropped by Anti-Spoofing? (Choose TWO)

Question 23mediummulti select

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Which TWO logs or diagnostic outputs are most effective when troubleshooting Phase 1 VPN negotiation failures? (Choose TWO)

Question 24mediummultiple choice

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A remote access user is unable to connect via Mobile Access VPN. The logs show 'IKE Phase 1 Main Mode negotiations failed'. Which action should be taken to isolate the issue?

Question 25hardmultiple choice

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Refer to the exhibit. An administrator sees this log entry while troubleshooting a site-to-site VPN. What is the most efficient way to resolve this error?

Exhibit

IKE_DEBUG: [VPN] Proposal mismatch: Proposed: AES256-SHA256-DH14, Configured: AES128-SHA1-DH2

Question 26mediummulti select

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A user reports they can connect via Remote Access VPN but cannot access internal web servers. Which TWO steps should the administrator take to troubleshoot this routing or policy issue?

Question 27hardmultiple choice

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Refer to the exhibit. A user is getting this log. What is the most likely cause?

Exhibit

FW_Log: 'Encryption failure: Packet is dropped because of a Security Association mismatch.'

Question 28mediummultiple choice

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You are troubleshooting a VPN issue and need to verify if the packets are being encrypted by the gateway. Which tool is the most appropriate for this task?

Question 29hardmulti select

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Which THREE conditions must be met for a successful Site-to-Site VPN tunnel establishment?

Question 30mediummultiple choice

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What is the primary function of the 'vpn tu' command in a troubleshooting scenario?

Question 31hardmultiple choice

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Refer to the exhibit. Why would an administrator use these two commands together?

Exhibit

vpn debug ikeon
vpn debug on TDERROR_ALL_ALL=5

Question 32hardmultiple choice

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Refer to the exhibit. What is the most likely reason for this error?

Exhibit

IKE_DEBUG: [VPN] Peer identity mismatch: Expected: 192.168.1.1, Received: 10.0.0.5

Question 33mediummultiple choice

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What is the role of Perfect Forward Secrecy (PFS) in a VPN tunnel?

Question 34hardmultiple choice

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Refer to the exhibit. What is the most effective way to troubleshoot this IKE Phase 1 failure?

Exhibit

IKE_DEBUG: [VPN] IKE Phase 1: No proposal chosen.

Question 35mediummultiple choice

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A remote access VPN client reports intermittent connection drops. The gateway logs show 'IKE failure: Phase 2 proposal mismatch'. What is the most likely cause?

Question 36hardmulti select

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Which TWO of the following troubleshooting commands are most effective for isolating VPN traffic flow issues in the kernel?

Question 37hardmultiple choice

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A user is experiencing 'No valid SA' errors when attempting to send traffic over a site-to-site VPN. What is the most likely cause?

Question 38mediummultiple choice

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A VPN gateway is failing to initiate a tunnel. You suspect the peer is unreachable. Which command is most appropriate to verify connectivity at the network level before troubleshooting the tunnel?

Question 39hardmultiple choice

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Refer to the exhibit. The 'vpn tu' utility shows an IPsec SA status of 'Initializing'. What does this state indicate?

Exhibit

vpn tu
1. List all IPsec SAs
2. List all IKE SAs
3. Delete all IPsec SAs
4. Delete all IKE SAs
Select option: 1

Result:
Peer: 1.2.3.4
Status: Initializing

Question 40mediummultiple choice

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What is the primary purpose of the 'Perfect Forward Secrecy' (PFS) feature in Check Point VPN configurations?

Question 41hardmultiple choice

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During a VPN migration, a new gateway is failing to decrypt traffic from a legacy peer. The legacy peer uses older algorithms. How should you troubleshoot this?

Question 42mediummulti select

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Which TWO of the following are common reasons for VPN tunnel packet fragmentation?

Question 43hardmultiple choice

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A Check Point security gateway terminates an IPsec site-to-site VPN to a third-party peer. Phase 1 completes, but Phase 2 fails with 'Quick Mode completion failed'. The third-party peer requires AES-256/SHA-256 for Phase 2, but the Check Point gateway's IPsec VPN community is configured with AES-128/SHA-1. Which action resolves the mismatch?

Question 44hardmultiple choice

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A Check Point R81 cluster uses a route-based VPN with a VTI interface to a remote peer. Users report that tunnel traffic intermittently fails, and the administrator observes that the VTI interface state is DOWN even though IKE Phase 1 and Phase 2 report success in 'vpn tu'. Which action is the most appropriate next step?

Question 45mediummulti select

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An administrator is troubleshooting a Check Point Remote Access VPN where users authenticate via LDAP but are not getting an IP address from the gateway's IP pool. The logs show 'user authenticated' but no 'IP assigned' message. Which TWO actions should the administrator take to resolve this? (Choose two.)

Question 46mediummultiple choice

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An administrator notices that a site-to-site VPN tunnel between two Check Point gateways frequently renegotiates Phase 2, causing brief interruptions. The log shows 'IKE Phase 2 rekey failed' messages. Which of the following is the most likely cause?

Question 47easymultiple choice

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A Check Point administrator needs to verify whether IPsec traffic from a specific remote peer is being decrypted and passed to the internal network. The administrator has access to the gateway's command line. Which command provides a real-time capture of packets on the gateway's external interface, showing both encrypted and decrypted traffic?

Question 48hardmultiple choice

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A Check Point gateway is configured for Mobile Access VPN with Office Mode. Remote users authenticate successfully but cannot access internal resources; the logs show 'encryption failure' for packets from the Office Mode IP pool. Which of the following is the most likely cause?

Question 49hardmultiple choice

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A Check Point gateway is configured for IPsec VPN with a peer. The administrator notices that the tunnel goes down periodically and re-establishes. The logs show 'IKE Phase 2 rekey failed' followed by 'Tunnel down'. The administrator suspects a lifetime mismatch. Which action should be taken to resolve the recurring rekey failures?

Question 50mediummultiple choice

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A Check Point administrator is troubleshooting an IPsec VPN where Phase 2 negotiations fail with the error 'No proposal chosen'. The peer is a Cisco ASA. Both gateways are configured with AES-256 and SHA-256 for Phase 2. What is the most likely cause?

Question 51hardmultiple choice

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A Security Administrator has configured a permanent site-to-site VPN between two Security Gateways. The tunnel is up, but large file transfers intermittently stall while small pings and HTTP requests succeed. The administrator notices the peer gateways advertise an MSS of 1460 on their external interfaces, and no NAT is involved. Which Check Point action is the most appropriate to resolve this?

Question 52mediummultiple choice

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A Check Point Security Gateway in a site-to-site VPN environment is configured with multiple external interfaces. After a recent ISP change, the VPN tunnel intermittently fails to establish, and the logs show 'Received notification from peer: INVALID-ID-INFORMATION'. Which action should you take first to resolve this issue?

Question 53mediummultiple choice

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A security administrator is troubleshooting a site-to-site VPN between two Check Point Security Gateways. Phase 1 completes successfully, but Phase 2 fails with the error 'Quick Mode failed: no matching proposal'. The administrator has verified that the encryption and hash algorithms match on both peers. Which action should the administrator take next to resolve the Phase 2 failure?

Question 54mediummultiple choice

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An administrator is troubleshooting a site-to-site VPN where Phase 1 completes but Phase 2 fails. The log shows 'Quick Mode failed: no proposal chosen'. Which of the following is the most likely cause?

Question 55hardmultiple choice

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An administrator notices that a site-to-site VPN tunnel between two Check Point gateways intermittently drops and re-establishes. The logs show 'IKE Phase 2 rekey failed' followed by 'Tunnel deleted'. What is the most likely cause?

Question 56mediummultiple choice

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A remote access VPN user authenticates successfully with a certificate, and IKE Phase 1 completes, but the tunnel drops immediately after Phase 2 starts. The gateway logs show that the user's certificate has been revoked. Which Check Point component should the administrator verify first to confirm the revocation status?

Question 57hardmultiple choice

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A Check Point Security Gateway is configured for route-based VPN using VTI interfaces. Users report that traffic to a remote subnet is not being encrypted, even though the VPN tunnel is up. The routing table shows the correct route pointing to the VTI interface. Which tool would you use to verify whether packets are being encrypted and sent through the tunnel?

Question 58easymultiple choice

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A remote access VPN user reports that they can connect to the Check Point Mobile Access portal but cannot access internal resources. The administrator checks the logs and sees that the user is assigned an IP address from the VPN pool, but no traffic is being decrypted. Which tool should the administrator use to verify whether the user's traffic is being encrypted and decrypted correctly?

Question 59hardmulti select

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An administrator is troubleshooting a Check Point VPN where a site-to-site tunnel is up, but some traffic is not being encrypted and is sent in clear text. The administrator suspects that the encryption domain is misconfigured. Which two actions should the administrator take to verify and resolve this issue? (Choose two.)

Question 60mediummultiple choice

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A Check Point Security Gateway is configured for a site-to-site VPN with a third-party gateway. The tunnel is up, but users cannot access resources across the VPN. You suspect a Phase 2 (IPsec) issue. Which of the following would you check first to ensure that the encryption domains are correctly configured?

Question 61hardmultiple choice

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A Check Point Security Gateway is experiencing intermittent VPN tunnel failures. The logs show 'Phase 2 completion failed' with the reason 'No proposal chosen'. Which of the following is the most likely cause?

Question 62hardmultiple choice

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An administrator is troubleshooting a site-to-site VPN between two Security Gateways. Phase 1 completes, but Phase 2 fails immediately. The administrator runs 'vpn debug ikeon', reproduces the failure, and inspects $FWDIR/log/ike.elg. The log shows 'Received notification from peer: NO_PROPOSAL_CHOSEN'. Which action should the administrator take next?

Question 63mediummulti select

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A Check Point Security Gateway is configured for a site-to-site VPN with a Cisco ASA. The tunnel is up, but traffic is not passing. You suspect a Phase 2 issue. Which TWO of the following should you check to resolve the problem? (Choose two.)

Question 64mediummultiple choice

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A remote access user reports that the Mobile Access VPN client connects, but internal web applications are unreachable. The administrator confirms the user authenticates successfully and receives an IP address from the Office Mode pool. Which action should the administrator take to diagnose why traffic is not reaching internal resources?

Question 65easymultiple choice

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A Check Point administrator needs to verify that VPN traffic is being encrypted and decrypted correctly on a Security Gateway. Which command should the administrator use to view the current IPsec SA details?

Question 66hardmulti select

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An administrator is troubleshooting an IPsec VPN that intermittently drops large file transfers while small pings succeed. The gateways are Check Point Security Gateways running R81.20. Which TWO actions should the administrator take to identify and resolve the issue? (Choose two.)

Question 67mediummultiple choice

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A remote access VPN user authenticates successfully with a certificate but cannot access internal resources. The Security Gateway logs show 'IKE Phase 2: No valid SA' and the user's client reports 'Failed to establish tunnel'. The gateway's VPN community uses AES-256 and SHA-256 for Phase 2. Which of the following is the most likely cause?

Question 68hardmultiple choice

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An administrator is troubleshooting a VPN where the Security Gateway logs show 'encryption failure: packet is dropped' for traffic from a specific subnet. The administrator confirms that the subnet is included in the VPN domain and that the firewall rule allows the traffic. Which action should the administrator take next to identify the cause?

Question 69hardmultiple choice

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An administrator configures a Star VPN community between a Check Point R81 gateway and a third-party peer. Phase 1 and Phase 2 complete, but the remote peer reports receiving packets with a source IP that does not match the negotiated selector, causing them to be dropped. The Check Point gateway shows the tunnel as up. Which Check Point mechanism is most likely rewriting the source address before encryption?

Question 70mediummultiple choice

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Users on a Check Point Remote Access VPN intermittently lose connectivity. The gateway logs show 'Phase 2 completion' followed shortly by 'rekey' messages, and the issue correlates with periods of high latency. Which Check Point setting should the administrator adjust to reduce the frequency of rekey-related drops on high-latency links?

Question 71easymultiple choice

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A Check Point administrator needs to confirm which encryption and hashing algorithms were actually negotiated for an established site-to-site VPN tunnel, because the peer reports a weaker algorithm than expected. Which Check Point command provides the negotiated IPsec SA parameters?

Question 72mediummultiple choice

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A Check Point Security Gateway is configured with a site-to-site VPN to a third-party gateway. The administrator notices that the VPN tunnel goes down and comes back up every hour. The logs show 'IKE Phase 2 rekey failed' just before the tunnel drops. Which of the following is the most likely cause of this rekey failure?