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CCNA Troubleshooting Questions

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76
MCQmedium

You are troubleshooting a packet drop issue on an SRX Series device and need to trace packets for a specific source IP address. Which feature should you configure to capture detailed packet flow logs?

A.set system syslog file packet-log
B.set security flow traceoptions file flow-debug
C.request security app-firewall log clear
D.set firewall filter debug term 1 then count
AnswerB

Correct. Flow traceoptions are specifically designed to log packet processing and drop reasons within the security flow engine.

Why this answer

Security flow traceoptions allow administrators to track packet processing steps through the security engine, capturing drop reasons and state changes.

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77
MCQmedium

An administrator suspects that a specific security policy is not being hit because traffic is being silently dropped by an earlier policy. Which feature should be enabled under security policies to generate a log entry whenever a session is created matching that policy?

A.configure security flow packet-log enable
B.configure security policies ... then { ... syslog alert; }
C.configure security policies ... then { ... log { session-init; } }
D.configure system syslog facility security packet-log
AnswerC

Configuring session-init inside the policy log statement generates a syslog message when the session is created.

Why this answer

To log when a session is created or closed, administrators configure session logging options within the security policy configuration.

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78
MCQhard

During session table analysis, you notice a session stuck in the 'SynSent' state. What does this state indicate about the traffic flow?

A.The TCP session has timed out and is waiting to be purged from memory.
B.The server has reset the connection via a RST packet.
C.The three-way handshake has completed successfully and data transfer is underway.
D.The SRX has received a SYN packet from the source, but no SYN-ACK has been returned from the destination.
AnswerD

SynSent means the forward SYN was processed, but the reverse SYN-ACK has not traversed the security device yet.

Why this answer

In Junos security flow, TCP session states track the handshake. SynSent indicates the SRX has seen a TCP SYN packet from the client, but has not yet seen the SYN-ACK from the server.

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79
MCQhard

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?

A.monitor traffic interface ge-0/0/0
B.show security alg statistics
C.show system alarms
D.show security flow statistics
AnswerD

This command displays a rich set of counters including active sessions, failed session allocations, and packet drop reasons.

Why this answer

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

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80
MCQeasy

An administrator needs to monitor CPU and memory utilization of the Routing Engine and Forwarding Plane on an SRX device. Which command provides this hardware health overview?

A.show chassis hardware
B.show security flow status
C.show system resources
D.show security monitoring resources
AnswerC

This command displays CPU utilization, memory usage, and load averages for the device.

Why this answer

The show system statistics or show chassis routing-engine commands display CPU and memory health, but show system resources provides a quick snapshot of system processes.

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81
Multi-Selecteasy

Which TWO methods or tools are available in Junos OS for monitoring active security sessions in real time? (Choose two)

Select 2 answers
A.show chassis routing-engine
B.show security flow session
C.show system processes
D.show security zone statistics
E.show security flow session summary
AnswersB, E

Lists active security sessions.

Why this answer

Active sessions can be monitored using show security flow session and its variants (summary, detail).

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82
MCQmedium

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

A.show security flow statistics
B.show system cpu-accounting
C.show firewall filter cpu-usage
D.show security packet-processing load
AnswerA

Correct. Flow statistics provide insights into session creation rates, active session counts, and packet processing metrics.

Why this answer

The show security flow statistics and show security monitoring commands help understand flow processing loads.

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83
MCQhard

While analyzing packet flow using security flow traceoptions, you see the message: "ALG: and AlgOpen() failed". What does this indicate?

A.The primary security policy denied the initial control connection.
B.The NAT pool was exhausted during source translation.
C.The Application Layer Gateway failed to allocate necessary resources or set up dynamic data channels.
D.The destination host refused the TCP connection via a RST packet.
AnswerC

This trace message indicates an internal failure within the ALG subsystem while attempting to parse or set up dynamic helper sessions.

Why this answer

Application Layer Gateways (ALGs) handle complex protocols like FTP, SIP, or TFTP. An AlgOpen() failure means the specific ALG failed to allocate resources or open secondary dynamic pinholes.

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84
MCQhard

An administrator enables traceoptions for IKE to troubleshoot a failing VPN negotiation. Where are these trace files stored by default on the SRX Series device?

A./var/tmp/traces/
B./etc/log/ike/
C./var/log/
D./config/sec/
AnswerC

Correct. Junos traceoutput files are saved in /var/log/.

Why this answer

Traceoptions files are stored in the /var/log/ directory by default on Junos OS devices.

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85
MCQmedium

An administrator suspects that a security policy is not applying logs because the log configuration syntax was entered incorrectly. Where should the logging keyword be attached within a security policy?

A.Inside the zone configuration
B.Within the then statement of the policy rule
C.At the global [edit security log] hierarchy only
D.Within the match statement of the policy rule
AnswerB

Logging actions (session-init or session-close) are defined as part of the action clause ('then') in a security policy.

Why this answer

Security policy logging options (such as log { init session-close; }) are specified inside the then statement of a policy rule.

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86
MCQmedium

An administrator needs to verify whether source NAT pool addresses are being exhausted. Which command should they execute?

A.show route pool-address
B.show security translation pool-exhaustion
C.show security nat source pool
D.show security flow pool-status
AnswerC

Correct. This command shows source NAT pool usage and available translation addresses.

Why this answer

The show security nat source pool command displays pool utilization statistics and active allocation counts.

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87
Multi-Selecthard

An administrator is analyzing the active session table using the 'show security flow session' command to diagnose asymmetric routing. Which TWO pieces of information are displayed in the session table output that help identify this issue? (Choose two)

Select 2 answers
A.The exact CPU core processing the session flow.
B.Packet and byte counters incrementing for both the client-to-server and server-to-client directions.
C.The complete BGP path attribute list for the session route.
D.Incoming and outgoing interface names for both forward and reverse traffic directions.
E.The administrative distance of the route used to establish the session.
AnswersB, D

Viewing counters for both directions helps verify if return traffic is reaching the expected interface.

Why this answer

Session tables display reverse and forward flow paths, interface names, and packet/byte counters which highlight asymmetric routing paths.

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88
MCQhard

While debugging NAT, you notice that session creation fails due to port block allocation failure. Which command helps inspect dynamic IP and port (DIPP) NAT usage?

A.show route forwarding-table dipp
B.show security flow dipp-status
C.show security nat source pool detail
D.show security translation port-blocks
AnswerC

Correct. Detailed pool output shows allocated port blocks and client mappings for DIPP NAT.

Why this answer

DIPP NAT usage and port block allocations can be inspected using show security nat source pool detail or DIPP-specific monitoring commands.

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89
Multi-Selecthard

Which THREE parameters are typically included in security flow traceoptions output when troubleshooting dropped packets? (Choose three)

Select 3 answers
A.Packet reception and interface context
B.Chassis power supply voltage levels
C.BGP AS path recomputation steps
D.Security policy lookup and match results
E.Reason for packet drop (if applicable, such as policy deny or screen violation)
AnswersA, D, E

Correct. Traces record ingress interface and packet details.

Why this answer

Flow traceoptions capture packet reception, policy lookup results, session allocation, and drop reasons.

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90
MCQmedium

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?

A.show security ipsec security-associations
B.show security flow vpn-status
C.show security ike sa-detail
D.show vpn ipsec active
AnswerA

Correct. This command shows Phase 2 IPsec security associations and traffic statistics.

Why this answer

The show security ike security-associations and show security ipsec security-associations commands are used to inspect VPN tunnels.

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