Question 2,129 of 2,152

Network Logging and Syslog →mediumMultiple ChoiceObjective-mapped

Syslog Server Not Receiving Messages Due to Missing 'logging on'

This 300-410 practice question tests your understanding of network logging and syslog. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.

A network engineer notices that the syslog server at 10.1.1.100 is not receiving any log messages from a Cisco router running IOS-XE 16.9. The engineer has configured 'logging host 10.1.1.100' and 'logging trap debugging'. The router can ping the syslog server successfully. What is the most likely cause of the missing syslog messages?

Clue words in this question

Noticing these words before you look at the options changes how you read each choice.

Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.

A
The 'logging on' command is not configured globally.
Correct because 'logging on' must be enabled to allow any syslog messages to be sent to a remote server. Without it, all syslog output is suppressed.
B
The syslog server is using UDP port 514, but the router is sending over TCP.
Why wrong: Incorrect because by default, Cisco IOS uses UDP port 514 for syslog unless explicitly configured with 'logging host <ip> transport tcp'.
C
The 'logging source-interface' is set to a loopback that is not advertised in the routing table.
Why wrong: Incorrect because while a missing source-interface can cause reachability issues, the default behavior uses the outgoing interface IP, which is reachable if the ping succeeds. The primary issue is more fundamental.
D
The 'logging buffered' command is overriding the remote logging configuration.
Why wrong: Incorrect because 'logging buffered' only affects local buffer logging and does not disable remote syslog; both can coexist.

Full breakdown with real-world context →

Quick Answer

The answer is the missing 'logging on' command globally disables syslog output on the router. Without this command, even when you have correctly configured 'logging host 10.1.1.100' and 'logging trap debugging', the router will not send any log messages to the syslog server, regardless of reachability or severity levels. This is a common oversight because 'logging on' acts as the master switch for all syslog generation, while the other commands only define where and what to send. On the Cisco CCNP ENARSI 300-410 exam, this scenario tests your understanding of the foundational syslog architecture, often appearing as a trap where candidates focus on interface selection or ACLs instead of the global enable. A reliable memory tip is to think of 'logging on' as the light switch—without it, no amount of wiring (host or trap configuration) will light the bulb.

Answer choices

Why each option matters

Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.

Correct answer & explanation

✓

The 'logging on' command is not configured globally.

The 'logging on' command is required globally to enable syslog message generation on Cisco IOS-XE devices. Without it, the router will not send any log messages to any destination, including the configured syslog server at 10.1.1.100, even though the 'logging host' and 'logging trap debugging' commands are present. The successful ping confirms IP connectivity, so the issue is that logging is disabled at the global level.

Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

✓
The 'logging on' command is not configured globally.
Why this is correct
Correct because 'logging on' must be enabled to allow any syslog messages to be sent to a remote server. Without it, all syslog output is suppressed.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The syslog server is using UDP port 514, but the router is sending over TCP.
Why it's wrong here
Incorrect because by default, Cisco IOS uses UDP port 514 for syslog unless explicitly configured with 'logging host <ip> transport tcp'.
✗
The 'logging source-interface' is set to a loopback that is not advertised in the routing table.
Why it's wrong here
Incorrect because while a missing source-interface can cause reachability issues, the default behavior uses the outgoing interface IP, which is reachable if the ping succeeds. The primary issue is more fundamental.
✗
The 'logging buffered' command is overriding the remote logging configuration.
Why it's wrong here
Incorrect because 'logging buffered' only affects local buffer logging and does not disable remote syslog; both can coexist.

Common exam traps

Common exam trap: answer the scenario, not the keyword

Cisco often tests the 'logging on' command as a hidden prerequisite that candidates overlook, assuming that configuring 'logging host' alone is sufficient to start sending syslog messages.

Detailed technical explanation

How to think about this question

The 'logging on' command enables the syslog process on the router, which is responsible for generating and forwarding messages based on severity levels (e.g., debugging). Without it, the router's logging subsystem is inactive, and no messages are sent to any destination, including console, monitor, buffer, or remote servers. This is a common misconfiguration because engineers often focus on the destination and severity commands while forgetting the global enable.

KKey Concepts to Remember

Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.

TExam Day Tips

Watch for words such as best, first, most likely and least administrative effort.
Review why wrong options are wrong, not only why the correct option is correct.

Key takeaway

Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.

Real-world example

How this comes up in practice

A practitioner preparing for the 300-410 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.

What to study next

Got this wrong? Here's your next step.

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

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FAQ

Questions learners often ask

What does this 300-410 question test?

Network Logging and Syslog — This question tests Network Logging and Syslog — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: The 'logging on' command is not configured globally. — The 'logging on' command is required globally to enable syslog message generation on Cisco IOS-XE devices. Without it, the router will not send any log messages to any destination, including the configured syslog server at 10.1.1.100, even though the 'logging host' and 'logging trap debugging' commands are present. The successful ping confirms IP connectivity, so the issue is that logging is disabled at the global level.

What should I do if I get this 300-410 question wrong?

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

Are there clue words in this question I should notice?

Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

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