JNCIA-SEC Monitoring And Troubleshooting — Timed 20 Questions

Question 1

You need to verify the operational status of an IPsec VPN tunnel on an SRX Series device. Which command provides detailed tunnel status including Phase 1 and Phase 2 associations?

Accepted Answer

show security ipsec security-associations. On Juniper SRX Series devices, `show security ipsec security-associations` displays the IPsec security associations (SAs) for both Phase 1 (IKE) and Phase 2 (IPsec) tunnels, including SPI, encryption/authentication algorithms, and tunnel status. This is the standard operational command to verify that an IPsec VPN tunnel is up and to inspect its association details.

Answer

show security flow vpn-status

Answer

show security ike sa-detail

Answer

show vpn ipsec active

Question 2

You suspect that Network Address Translation (NAT) is misconfigured for a server pool. Which command should you use to examine active NAT translation entries?

Accepted Answer

show security nat translation. The command 'show security nat translation' displays active NAT translation entries on an SRX, including source and destination translations. It is the correct operational command to examine current NAT mappings for troubleshooting misconfigurations.

Answer

show route forwarding-table destination-nat

Answer

show security alg status

Answer

show security flow active-nat

Question 3

An engineer needs to troubleshoot asymmetric routing issues where return traffic bypasses the SRX firewall. Which flow option can be enabled to handle asymmetric paths?

Accepted Answer

set security flow tcp-session no-syn-check. Enabling syn-flood-protection or stateless-flow options can help, but flow-based setting 'tcp-session no-syn-check' allows sessions to establish without seeing the initial SYN packet.

Answer

set security flow asymmetric-routing permit

Answer

set routing-options instance-type virtual-router

Answer

set security policies bypass-reverse-path

Question 4

Which command is used to display current CPU and memory utilization on an SRX Series services gateway?

Accepted Answer

show system processes summary. The show system्ह resource or show system processes command family provides resource utilization, with show system information or show chassis routing-engine being standard.

Answer

show security resource-utilization

Answer

show route summary-statistics

Answer

show chassis cpu-memory

Question 5

When troubleshooting a high CPU condition caused by security processing, which command helps identify which traffic flows or features are consuming resources?

Accepted Answer

show security flow statistics. The 'show security flow statistics' command displays flow-related counters, session creation rates, and per-feature processing statistics that help identify which traffic or security features are driving CPU load. It provides visibility into flow processing activity, including session setup rates and packet counts across security features, making it the right tool to correlate high CPU with specific flow activity.

Answer

show system cpu-accounting

Answer

show firewall filter cpu-usage

Answer

show security packet-processing load

Question 6

You suspect that a specific security policy rule is shadowing another rule. How can you review the evaluated order of security policies?

Accepted Answer

show security policies from-zone trust to-zone untrust detail. The show security policies detail or show security policies from-zone ... to-zone ... commands show exact policy ordering.

Answer

show firewall filter sequence

Answer

show security flow policy-order

Answer

show security rule-evaluation order

Question 7

An administrator wants to inspect packet flow drops specifically caused by security policies. Which command displays policy drop counters?

Accepted Answer

show security flow statistics. The show security policies hit-count command combined with checking flow statistics helps, but show security flow statistics also tracks policy drops.

Answer

show firewall counter policy-drops

Answer

show system drop-statistics

Answer

show security policy drop-counters

Question 8

Which command confirms whether the Security Intelligence (SecIntel) feeds or threat feeds are actively updating on an SRX device?

Accepted Answer

show security intelligence status. 'show security intelligence status' is the Junos command that reports the state of Security Intelligence feeds, including whether they are enabled, their update status, and last update time. It confirms active feed updates on the SRX.

Answer

show firewall intelligence-status

Answer

show system threat-feeds

Answer

show security threat-feed active

Question 9

An administrator needs to verify whether IDP (Intrusion Detection and Prevention) is actively inspecting traffic. Which operational command should be used?

Accepted Answer

show security idp status. The command 'show security idp status' is the correct operational command on Junos/SRX to verify whether the IDP (Intrusion Detection and Prevention) engine is enabled and actively inspecting traffic. It reports the IDP status, including whether inspection is running, the policy in use, and detection mode. This directly answers the administrator's need to confirm active inspection.

Answer

show idp policy active

Answer

show security flow idp-stats

Answer

show firewall idp-inspection

Question 10

An administrator wants to clear all inactive sessions from the security session table to free up resources. Which command achieves this?

Accepted Answer

clear security flow session all. The command 'clear security flow session all' clears all sessions from the SRX security flow session table, including inactive ones, freeing resources. This is the standard operational command to flush the session table when troubleshooting or recovering from resource exhaustion.

Answer

request security flow flush

Answer

delete security flow session inactive

Answer

reset security session-table

Question 11

You are troubleshooting an issue where security logging is failing to reach the remote syslog server. Which command allows you to test syslog connectivity and queue status?

Accepted Answer

show system logging status. The show system syslog command or checking system processes / messages helps, but show system logging status or checking syslog error counters via operational commands provides diagnostic visibility.

Answer

show security log statistics

Answer

show network syslog connection

Answer

show syslog remote-status

Question 12

Which TWO methods can an administrator use to monitor real-time traffic passing through a specific firewall interface? (Choose two)

Accepted Answer

show interfaces ge-0/0/1 statistics. Option A, `show interfaces ge-0/0/1 statistics`, is correct because it displays real-time counters (packets, bytes, errors) for the specified interface, letting an administrator observe live traffic volume passing through that interface. Option D, `monitor traffic interface ge-0/0/1`, is correct because it uses the Junos packet-capture utility to display live packets traversing the interface in real time, which is the standard method for real-time traffic monitoring. Option B is not a valid Junos command, so it cannot be used. Option C is incorrect because `show firewall filter interface` is not a valid syntax for monitoring interface traffic. Option E is incorrect because `show security flow session interface ge-0/0/1` displays existing session information rather than real-time traffic statistics or live packet flow.

Answer

request security monitoring interface ge-0/0/1

Answer

show firewall filter interface ge-0/0/1

Answer

show security flow session interface ge-0/0/1

Question 13

Which TWO commands can be used to view IPsec VPN security associations on an SRX Series device? (Choose two)

Accepted Answer

show security ipsec security-associations. Option D, 'show security ipsec security-associations', is correct because it is the Junos command that directly lists the IPsec Phase 2 security associations (SAs) on an SRX, including the SPI, peer gateway, and encryption/authentication algorithms in use. Option E, 'show security ike security-associations', is correct because it displays the IKE Phase 1 security associations that establish the IPsec tunnels, showing the peer address, IKE state, and Phase 1 parameters. Together these two commands cover both phases of IPsec SA verification on the SRX. Option A, 'show security flow vpn-table', is not a valid Junos command for viewing IPsec SAs, and Option B, 'show security policies vpn', is not a valid command syntax for this purpose. Option C, 'show vpn ipsec active', is not a valid SRX operational command for displaying IPsec security associations.

Answer

show security flow vpn-table

Answer

show security policies vpn

Answer

show vpn ipsec active

Question 14

Which THREE parameters can be used to filter output when executing the 'show security flow session' command? (Choose three)

Accepted Answer

destination-prefix. The 'show security flow session' command on Junos SRX devices supports filtering by traffic identifiers, and destination-prefix (A), destination-port (C), and source-prefix (E) are all valid filter parameters that narrow the session output to sessions matching a specific destination subnet, destination port number, or source subnet respectively. These filters let an administrator quickly isolate sessions of interest, for example 'show security flow session destination-prefix 10.1.1.0/24' or 'show security flow session destination-port 443'. The remaining options are not session-filter parameters: chassis-slot (B) is used with commands that target a specific chassis slot (such as 'show chassis fpc' or 'show interfaces ... | display chassis-slot'), and routing-engine-core (D) is not a valid filter for this command either, as core selection is not part of session filtering.

Answer

chassis-slot

Answer

routing-engine-core

Question 15

Which TWO commands provide system-level resource utilization data on an SRX Series device? (Choose two)

Accepted Answer

show chassis environment. Option C, 'show chassis environment', is correct because it reports system-level hardware resource data on an SRX Series device, including chassis temperature, fan status, power supply status, and other environmental/health metrics that reflect physical resource utilization. Option E, 'show system processes summary', is correct because it provides system-level CPU and memory utilization data for the processes running on the device, which is exactly the kind of resource utilization information the question asks for. Option A, 'show route summary', is not correct because it only displays routing table statistics such as route counts per protocol, not system resource utilization. Option B, 'show security flow session summary', is not correct because it reports session counts and flow-related statistics, not system-level resource usage. Option D, 'show security policies summary', is not correct because it only shows policy counts and related policy statistics, not CPU, memory, or hardware resource utilization.

Answer

show route summary

Answer

show security flow session summary

Answer

show security policies summary

Question 16

Which TWO commands help verify security zone configurations and interface memberships? (Choose two)

Accepted Answer

show security zones security-zone trust. Option A, `show security zones security-zone trust`, is correct because it displays the detailed configuration of the named security zone, including its assigned interfaces, so you can verify that the correct interfaces are bound to the trust zone. Option B, `show security zones`, is correct because it lists all configured security zones along with their interface memberships, giving a complete overview of zone-to-interface binding. Option C, `show route security-zones`, is not a valid Junos operational command for zone verification; it does not exist for this purpose. Option D, `show interfaces security-status`, is not a valid command for checking zone membership. Option E, `show firewall zone-membership`, is not a valid Junos command for verifying security zone configuration or interface membership.

Answer

show route security-zones

Answer

show interfaces security-status

Answer

show firewall zone-membership

Question 17

Which THREE metrics are displayed when monitoring security screening statistics? (Choose three)

Accepted Answer

IP spoofing drop counts. Security screening statistics focus on traffic anomalies and attack signatures handled by the screening/anti-DDoS function, so IP spoofing drop counts (B) are correct because spoofed-source packets are dropped and counted as a screening metric. SYN flood attack detection counts (D) are correct because SYN flood detection is a core screening statistic reported by the security screening module. ICMP flood violation counters (E) are also correct since ICMP flood violations are tracked as part of the same flood-protection screening statistics. BGP prefix withdrawal rates (A) belong to routing/BGP monitoring, not security screening, and IPsec re-key failure counts (C) belong to IPsec VPN/IKE monitoring rather than screening statistics.

Answer

BGP prefix withdrawal rates

Answer

IPsec re-key failure counts

Question 18

An engineer notices that specific traffic is being dropped silently by the SRX Series device. To capture detailed log messages about security policy evaluations, where should traceoptions be configured?

Accepted Answer

[edit security policies traceoptions]. Security policy evaluation logging and traceoptions are configured under the [edit security policies] hierarchy.

Answer

[edit security flow traceoptions]

Answer

[edit system services traceoptions]

Answer

[edit security zone traceoptions]

Question 19

You need to monitor dropped packets in real-time on an SRX Series device without disrupting production traffic. Which tool is best suited for identifying drop counters across security features?

Accepted Answer

show security flow statistics. The show security flow statistics command displays various internal drop counters such as policy drops, session drops, and screen drops.

Answer

monitor traffic interface ge-0/0/0

Answer

show security alg statistics

Answer

show system alarms

Question 20

An administrator wants to view log messages generated by security policies. Which syslog facility is typically used by Junos security policies for logging event messages?

Accepted Answer

local0 through local7. Security policies log events to the user facility or daemon facility depending on configuration, but security-specific log messages are typically directed to security-related facilities like RT_FLOW.

Answer

kernel

Answer

auth

Answer

security