NetSec-Analyst Troubleshooting — 15 Questions

Question 1

If an administrator needs to check the status of a physical interface to see if it is 'up/up', which CLI command is most appropriate?

Accepted Answer

show interface all. The 'show interface' command provides the link state and operational status of physical interfaces.

Answer

show network interface

Answer

show chassis status

Answer

show system status

Question 2

You are troubleshooting an issue where a site-to-site VPN tunnel is 'up' but no traffic passes. Which tool is best suited to verify if the packets are being encapsulated correctly?

Accepted Answer

show vpn flow. The 'test vpn tunnel' commands (and checking counters) allow you to verify the encapsulation and state of the tunnel interface.

Answer

debug ike global

Answer

show routing route

Answer

ping host from tunnel interface

Question 3

A administrator is troubleshooting an intermittent application failure. The Traffic log shows the session is aging out due to 'tcp-rst-from-client'. What is the most effective way to determine if the Palo Alto Networks firewall is prematurely closing the session?

Accepted Answer

Monitor 'show counter global filter packet-filter yes' while performing a test. Running a debug flow filter and then observing the output via 'show counter global' helps identify if the firewall is dropping the packet due to internal resource exhaustion or state mismatches.

Answer

Increase the TCP session timeout in the Application override

Answer

View the ACC tab for TCP reset trends

Answer

Disable hardware offload

Question 4

An administrator observes that traffic from the internal network to a specific external server is being dropped. The Traffic Log shows 'drop' with the 'policy-deny' reason. Which tool should the administrator use to identify which security policy is causing this drop?

Accepted Answer

Policy Optimizer. The Policy Optimizer within the Security Policy view is specifically designed to identify which rule matches the traffic flow.

Answer

GlobalProtect Log

Answer

ACC (Application Command Center)

Answer

Packet Capture (pcap)

Question 5

A administrator needs to monitor traffic throughput on a specific sub-interface. Which command provides real-time throughput data?

Accepted Answer

show interface. The 'show session info' or interface statistics commands are used, but 'show interface <interface>' displays real-time throughput metrics.

Answer

show counter interface

Answer

show system resources

Answer

show session all

Question 6

An administrator has configured a new NAT rule, but traffic is not traversing it. Which column in the NAT logs is the most useful for verifying the NAT translation is occurring?

Accepted Answer

Translated Address. The NAT logs show the 'Source Translated' and 'Destination Translated' addresses, confirming if the rule was applied.

Answer

Application

Answer

Action

Answer

Rule Name

Question 7

An administrator needs to perform a packet capture to troubleshoot a slow application. Which stage is most appropriate to capture the packet to ensure it is being decrypted?

Accepted Answer

Decrypt stage. The 'decrypt' stage in the packet capture configuration allows the administrator to see the traffic after the firewall has decrypted it.

Answer

Transmit stage

Answer

Firewall stage

Answer

Receive stage

Question 8

Which CLI command is used to verify the current status of the high availability (HA) pair?

Accepted Answer

show high-availability state. The 'show high-availability state' command provides the current operational status and role of each firewall in the HA pair.

Answer

show ha status

Answer

show system ha

Answer

show system info

Question 9

A DHCP server configured on the firewall is not assigning IPs to clients. Which tool is best to troubleshoot the DHCP relay/server process?

Accepted Answer

debug dhcp. The 'debug dhcp' commands allow the administrator to see the DHCP request/offer process in the logs.

Answer

show network interface

Answer

show system stats

Answer

Packet capture on the interface

Question 10

If you are unable to ping a management interface from a remote subnet, what is the first setting you should check?

Accepted Answer

Management Interface Settings. The 'Management Interface Settings' control which services (like Ping/HTTPS) are allowed on the management port.

Answer

Routing table

Answer

NAT rules

Answer

Security Policy rules

Question 11

Which THREE CLI commands help in diagnosing routing issues?

Accepted Answer

show network arp. Option C, 'show network arp', is correct because it displays the ARP cache, revealing IP-to-MAC mappings that are essential for verifying Layer 2/Layer 3 adjacency and detecting stale or missing entries that break routing. Option D, 'show routing route', is correct because it dumps the device's routing table, letting you confirm that expected routes exist, check their next hops, metrics, and flags, and spot missing or misconfigured entries. Option E, 'test routing fib-lookup', is correct because it performs a lookup in the forwarding information base for a given destination, showing exactly which route and egress interface the device would use, which directly validates routing decisions. The unmarked options do not belong: 'show session info' (A) reports management session details such as user, timeout, and connection type, and 'show system info' (B) reports platform, uptime, and resource data, neither of which exposes routing or forwarding state.

Answer

show session info

Answer

show system info

Question 12

Which TWO of the following logs are most useful when troubleshooting a potential Denial of Service (DoS) attack?

Accepted Answer

System Log. The System Log (C) is correct because it records system-level events such as resource exhaustion, high CPU or session-table utilization, and daemon restarts, which are classic symptoms of a DoS attack overwhelming a firewall or security appliance. The Threat Log (E) is correct because it captures security events like flood, scan, and DoS signatures generated by the zone protection or DoS protection profiles, directly identifying the attack traffic and its source. The URL Filtering Log (A) only records web-browsing URL category decisions and cannot reveal volumetric or resource-exhaustion attack patterns. The Traffic Log (B) shows session details such as source, destination, and application, but it is a general connectivity record rather than a dedicated indicator of DoS conditions. The Data Filtering Log (D) only reports file and data pattern matches, which are unrelated to detecting a denial-of-service condition.

Answer

URL Filtering Log

Answer

Traffic Log

Answer

Data Filtering Log

Question 13

Which THREE of the following are components of the dataplane in the Palo Alto Networks architecture?

Accepted Answer

Session Management. The dataplane in Palo Alto Networks architecture handles the actual traffic processing, and Session Management (A) is a core dataplane function that tracks and maintains flow state for every session traversing the firewall. Hardware Acceleration (D) using FPGA/ASIC is also a dataplane component, offloading cryptographic and pattern-matching operations to dedicated hardware for line-rate performance. Security Processing (E) with App-ID and Content-ID is performed in the dataplane, where the firewall identifies applications and inspects content inline. The Management UI process (B) and Configuration database (C) belong to the management plane, which handles administration, configuration, and logging rather than packet forwarding or inspection.

Answer

Management UI process

Answer

Configuration database

Question 14

Which TWO of the following actions in a security policy will result in an entry in the Threat Log?

Accepted Answer

Drop. In a Palo Alto Networks security policy, the Threat Log records security events generated by the Content-ID and threat-prevention engines, and the action taken on the session determines whether such an event is logged. Option A, Drop, is correct because when a security profile (such as Antivirus, Anti-Spyware, or Vulnerability Protection) is set to drop a malicious session, the corresponding threat event is written to the Threat Log. Option E, Alert, is correct because the alert action generates a threat log entry while allowing the session to continue, which is the classic behavior for monitoring threats without blocking. Options B (Bypass) and D (Allow) do not produce Threat Log entries because they do not invoke a threat-prevention action that generates a threat event, and Option C (Reset-both) is a session-termination action that does not itself create a Threat Log entry in the same way as a threat-prevention profile action.

Answer

Bypass

Answer

Reset-both

Answer

Allow

Question 15

A network security analyst is investigating why a user's web browsing session is being blocked by the firewall. The analyst runs a packet capture and sees that the firewall is resetting the connection after the TLS handshake. The analyst suspects that SSL decryption is failing. Which of the following is the most likely cause?

Accepted Answer

The certificate used for SSL decryption is not trusted by the client, causing the client to terminate the connection.. The reset after the TLS handshake indicates that the client rejected the firewall's certificate during SSL decryption. This happens when the client does not trust the certificate authority that signed the firewall's decryption certificate. The forward trust certificate is used by the firewall to sign forged certificates, but the client must trust that CA. If not, the client aborts the connection, causing a reset.

Answer

The firewall's SSL decryption license has expired.

Answer

The SSL decryption policy is not applied to the user's traffic.

Answer

The forward trust certificate is not installed on the firewall.