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300-410 Practice Question: Runs the following command to troubleshoot an…
A network engineer runs the following command to troubleshoot an ERSPAN issue:
R1# show monitor session 3 detail
Session 3 --------- Type : ERSPAN Source Session Source Ports : Both : Gi0/0 Destination IP : 10.1.1.1 ERSPAN ID : 100
What does this output indicate?
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 session is correctly configured as an ERSPAN source session.
The output shows an ERSPAN source session with source port Gi0/0, destination IP 10.1.1.1, and ERSPAN ID 100. This is the source side of an ERSPAN configuration.
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 session is correctly configured as an ERSPAN source session.
Why this is correct
The output confirms an ERSPAN source session with a destination IP and ERSPAN ID.
- ✗
The session is misconfigured because the destination must be a VLAN, not an IP.
Why it's wrong here
ERSPAN uses an IP address as the destination for remote monitoring.
- ✗
The session is misconfigured because the source port must be a VLAN.
Why it's wrong here
Source ports can be physical interfaces in ERSPAN.
- ✗
The session is misconfigured because the ERSPAN ID must match on both source and destination.
Why it's wrong here
The ERSPAN ID must match, but this output does not indicate a misconfiguration.
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Same concept, more angles
3 more ways this is tested on 300-410
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A network engineer runs the following command to troubleshoot an ERSPAN issue: R1# show monitor session 5 detail Session 5 --------- Type : ERSPAN Destination Session Source IP : 10.1.1.2 ERSPAN ID : 100 Destination Ports : Gi0/3 Encapsulation : Native Ingress : Disabled What does this output indicate?
medium- ✓ A.The session is correctly configured as an ERSPAN destination session.
- B.The session is misconfigured because the source must be a VLAN, not an IP.
- C.The session is misconfigured because the destination port must have ingress enabled.
- D.The session is misconfigured because the ERSPAN ID must be different from the source session.
Why A: The output shows an ERSPAN destination session with source IP 10.1.1.2, ERSPAN ID 100, and destination port Gi0/3. This is the destination side of an ERSPAN configuration.
Variation 2. A network engineer runs the following command to troubleshoot an ERSPAN issue: R1# show monitor session 6 detail Session 6 --------- Type : ERSPAN Source Session Source VLANs : Both : 10-20 Destination IP : 10.1.1.3 ERSPAN ID : 200 What does this output indicate?
hard- ✓ A.The session is correctly configured to monitor VLANs 10 through 20.
- B.The session is misconfigured because ERSPAN cannot use VLANs as source.
- C.The session is misconfigured because the ERSPAN ID must be less than 100.
- D.The session is misconfigured because the destination IP must be on the same subnet.
Why A: The output shows an ERSPAN source session with source VLANs 10-20, destination IP 10.1.1.3, and ERSPAN ID 200. This is a valid ERSPAN source session using VLANs as the source.
Variation 3. A network engineer runs the following command to troubleshoot an ERSPAN issue: R1# show ip interface brief | include Gi0/0 GigabitEthernet0/0 10.1.1.1 YES NVRAM up up R1# show monitor session 7 detail Session 7 --------- Type : ERSPAN Source Session Source Ports : Both : Gi0/1 Destination IP : 10.1.1.2 ERSPAN ID : 300 What does this output indicate?
hard- ✓ A.The ERSPAN session is correctly configured and the destination IP is reachable.
- B.The ERSPAN session is misconfigured because the source port must have an IP address.
- C.The ERSPAN session is misconfigured because the destination IP must be on the same subnet as the source.
- D.The ERSPAN session is misconfigured because the ERSPAN ID must be unique across all sessions.
Why A: The output shows that interface Gi0/0 has IP address 10.1.1.1 and is up/up, and ERSPAN session 7 has destination IP 10.1.1.2. This indicates that the ERSPAN source session is configured to send traffic to 10.1.1.2, which is reachable via Gi0/0.
JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 300-410 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 300-410 exam.