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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 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?
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 ERSPAN session is correctly configured and the destination IP is reachable.
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.
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 ERSPAN session is correctly configured and the destination IP is reachable.
Why this is correct
The interface is up and the destination IP is likely reachable.
- ✗
The ERSPAN session is misconfigured because the source port must have an IP address.
Why it's wrong here
The source port does not need an IP address for ERSPAN.
- ✗
The ERSPAN session is misconfigured because the destination IP must be on the same subnet as the source.
Why it's wrong here
The destination IP can be on a different subnet.
- ✗
The ERSPAN session is misconfigured because the ERSPAN ID must be unique across all sessions.
Why it's wrong here
ERSPAN IDs must be unique per session, but this output does not indicate a conflict.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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