Question 1hardmultiple choice
Full question →hardmultiple choiceObjective-mapped
A network administrator configures a router to send syslog messages to a central log server. The administrator can ping the server from the router, but the server is not receiving any logs. What is the most likely cause?
Answer choices
Why each option matters
Good practice is not just finding the correct option. The wrong answers often show the exact trap the exam wants you to fall into.
A
Distractor review
The syslog server is using the wrong protocol (TCP instead of UDP)
While some syslog implementations support TCP, by default syslog uses UDP. The issue is more likely a firewall blocking the port.
B
Best answer
UDP port 514 is blocked between the router and the server
The router can reach the server (ping works), so the path is up. Syslog relies on UDP 514; if that port is blocked, logs will not be delivered.
C
Distractor review
The syslog service on the server is not running
If the service were not running, the server would not respond, but that would not prevent the router from sending the messages; the server simply would not log them. The lack of receipt indicates a delivery problem.
D
Distractor review
The router's clock is not synchronized with the server
Time synchronization affects log timestamps but does not prevent the router from sending syslog messages.
Common exam trap
Common exam trap: ACLs stop at the first match
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
Technical deep dive
How to think about this question
ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.
KKey Concepts to Remember
- Standard ACLs match source addresses.
- Extended ACLs can match source, destination, protocol and ports.
- The first matching ACL entry is used.
- There is usually an implicit deny at the end.
TExam Day Tips
- Check inbound versus outbound direction.
- Read the ACL from top to bottom.
- Look for a broader permit or deny above the intended line.
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More questions from this exam
Keep practising from the same exam bank, or move into a focused topic page if this question exposed a weak area.
Question 1
A network engineer needs to connect two switches located 400 meters apart. The cable run includes high electromagnetic interference from nearby machinery. The engineer decides to use fiber optic cabling. Which transceiver type and fiber combination should be used to ensure the link reaches 400 meters while remaining cost-effective?
Question 2
A network engineer is designing a new switched network and needs to ensure that broadcast traffic from one department does not reach another department's workstations. The engineer plans to use VLANs. Which of the following must be configured on the switches to isolate broadcast domains as intended?
Question 3
A security engineer is configuring a site-to-site VPN between two branch offices. The requirement is to encrypt all traffic between the two networks using IPsec. Which IPsec mode should be used to encrypt the entire IP packet including the original header?
Question 4
A network administrator is connecting two switches to increase bandwidth and provide redundancy. Which technology should be used to combine multiple physical links into a single logical link?
Question 5
A network administrator is experiencing issues where unauthorized devices are offering IP addresses to clients, causing connectivity problems. Which security feature should be enabled on switches to prevent this?
Question 6
A network administrator is troubleshooting a connectivity issue and suspects the problem is related to the physical cabling. At which layer of the OSI model should the administrator begin their investigation?
FAQ
Questions learners often ask
What does this N10-009 question test?
Standard ACLs match source addresses.
What is the correct answer to this question?
The correct answer is: UDP port 514 is blocked between the router and the server — Syslog messages are typically sent using UDP port 514. If a firewall or access list is blocking UDP 514, the messages will not reach the server even though ICMP (ping) is allowed. This is a common issue when syslog is not working but connectivity exists.
What should I do if I get this N10-009 question wrong?
Then try more questions from the same exam bank and focus on understanding why the wrong options are tempting.
Discussion
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