mediumMultiple Choice
300-410 Practice Question: Runs the following command to troubleshoot a SPAN…
A network engineer runs the following command to troubleshoot a SPAN issue:
R1# show monitor session 1 detail
Session 1 --------- Type : Local Session Source Ports : Both : Gi0/0 Destination Ports : Gi0/1
Encapsulation : Native
Ingress : Disabled
What does this output indicate?
⚠ Common exam trap
The trap is treating optional SPAN parameters (ingress, encapsulation type, VLAN source) as mandatory, causing candidates to flag a correctly configured session as misconfigured.
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 to send traffic from Gi0/0 to Gi0/1.
The output shows a valid local SPAN session: source Gi0/0 (both directions) is copied to destination Gi0/1 with native encapsulation. Ingress on the destination is disabled by default and is not required for a working SPAN session, so the configuration is correct.
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 to send traffic from Gi0/0 to Gi0/1.
Why this is correct
The output shows a local session with Gi0/0 as the source (both directions) and Gi0/1 as the destination, using native encapsulation with ingress disabled. That combination is a valid, functioning SPAN configuration, so traffic from Gi0/0 is copied to Gi0/1.
- ✗
The session is misconfigured because the destination port should have ingress enabled.
Why it's wrong here
Ingress is disabled by default on the destination port and is not required for SPAN to function; only ingress traffic from the source is mirrored. Enabling ingress is used when the destination also needs to receive its own traffic, not for basic monitoring.
- ✗
The session is misconfigured because the source port must be a VLAN.
Why it's wrong here
Source ports can be physical interfaces, so Gi0/0 is valid; VLAN sources are only required for VLAN-based SPAN, not local sessions. It tempts engineers who confuse RSPAN VLAN monitoring with local port mirroring, where a VLAN is the correct source.
- ✗
The session is misconfigured because encapsulation must be set to 'replicate'.
Why it's wrong here
Native encapsulation is valid for local SPAN; 'replicate' applies to RSPAN or ERSPAN remote sessions that tunnel mirrored frames. It tempts candidates who assume all SPAN traffic must be encapsulated for transport across a network.
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official Cisco exam blueprint
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