Question 1,131 of 2,015

SPAN and RSPAN →hardMultiple SelectObjective-mapped

Quick Answer

The correct statement is that RSPAN source sessions and local SPAN sessions count toward the same session limit on a switch. This is true because Cisco switches impose a combined hardware resource limit for all SPAN and RSPAN source sessions, typically allowing up to two local SPAN sessions and one RSPAN source session, meaning you cannot exceed that total regardless of type. On the ENCOR 350-401 exam, this concept tests your understanding of switch monitoring constraints and often appears as a trap where candidates assume RSPAN sessions are separate from local SPAN limits. A common pitfall is forgetting that a destination port can only belong to one session at a time, while a source port can be reused across multiple sessions. For memory, think “2+1 equals the total limit” — two local SPAN sessions plus one RSPAN source session share the same pool, so you cannot run three local SPAN sessions even if you have no RSPAN configured.

350-401 SPAN and RSPAN Practice Question

This 350-401 practice question tests your understanding of span and rspan. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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.

Which two statements about SPAN and RSPAN configuration limits are true? (Choose two.)

Question 1hardmulti select

Full question →

A
A single port can be a SPAN source for multiple SPAN sessions simultaneously.
Correct because a source port can be monitored by multiple SPAN sessions.
B
A SPAN destination port can be used in multiple SPAN sessions at the same time.
Why wrong: Incorrect because a destination port can only be used in one SPAN session at a time.
C
RSPAN source sessions and local SPAN sessions count toward the same session limit on a switch.
Correct because the session limit (e.g., 2) applies to both local and RSPAN source sessions combined.
D
The maximum number of SPAN sessions on a switch is always 4.
Why wrong: Incorrect because the maximum varies by platform; many Catalyst switches support only 2 sessions.
E
A SPAN source VLAN can be used in both a local SPAN and an RSPAN session at the same time.
Why wrong: Incorrect because a VLAN can be a source in only one SPAN session (local or RSPAN) at a time.

Full breakdown with real-world context →

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

✓

A single port can be a SPAN source for multiple SPAN sessions simultaneously.

Cisco switches have limits on the number of SPAN/RSPAN sessions, typically up to 2 local SPAN sessions and 1 RSPAN source session. A single port can be a source for multiple sessions, but a destination port can only be used in one session at a time. The source and destination ports must be on the same switch for local SPAN.

Key principle: A trunk being up does not mean the VLAN is allowed across it. Always verify the allowed VLAN list and whether the VLAN exists on both switches.

Answer analysis

Option-by-option breakdown

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

✓
A single port can be a SPAN source for multiple SPAN sessions simultaneously.
Why this is correct
Correct because a source port can be monitored by multiple SPAN sessions.
Related concept
Access ports place end devices into a single VLAN.
✗
A SPAN destination port can be used in multiple SPAN sessions at the same time.
Why it's wrong here
Incorrect because a destination port can only be used in one SPAN session at a time.
✓
RSPAN source sessions and local SPAN sessions count toward the same session limit on a switch.
Why this is correct
Correct because the session limit (e.g., 2) applies to both local and RSPAN source sessions combined.
Related concept
Access ports place end devices into a single VLAN.
✗
The maximum number of SPAN sessions on a switch is always 4.
Why it's wrong here
Incorrect because the maximum varies by platform; many Catalyst switches support only 2 sessions.
✗
A SPAN source VLAN can be used in both a local SPAN and an RSPAN session at the same time.
Why it's wrong here
Incorrect because a VLAN can be a source in only one SPAN session (local or RSPAN) at a time.

Common exam traps

Common exam trap: an active trunk can still block the VLAN you need

A trunk being up does not prove every VLAN is crossing it. Check allowed VLAN lists, native VLAN mismatch, VLAN existence and access-port assignment.

Detailed technical explanation

How to think about this question

VLAN questions usually combine access-port and trunking clues. The key is to identify whether the issue is local to one switchport, caused by the trunk, or caused by the VLAN not existing where it needs to exist.

KKey Concepts to Remember

Access ports place end devices into a single VLAN.
Trunk ports carry multiple VLANs between switches.
Allowed VLAN lists decide which VLANs can cross a trunk.
Native VLAN mismatch can create confusing symptoms.

TExam Day Tips

Use show vlan brief to verify access VLANs.
Use show interfaces trunk to verify trunk state and allowed VLANs.
Do not treat every same-VLAN issue as a routing problem.

Key takeaway

A trunk being up does not mean the VLAN is allowed across it. Always verify the allowed VLAN list and whether the VLAN exists on both switches.

Real-world example

How this comes up in practice

A help-desk technician troubleshoots why a newly connected PC cannot reach shared printers on the same floor. The cable is good, the switch port is active, but the PC is in VLAN 20 and the printers are in VLAN 10. The uplink trunk only allows VLAN 10. A trunk being up does not mean every VLAN crosses it.

What to study next

Got this wrong? Here's your next step.

Review VLAN allowed lists, native VLAN mismatch detection, and how to verify VLAN membership with show vlan brief and show interfaces trunk. Then practise related 350-401 questions on switching, trunking, and access-port configuration.

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FAQ

Questions learners often ask

What does this 350-401 question test?

SPAN and RSPAN — This question tests SPAN and RSPAN — Access ports place end devices into a single VLAN..

What is the correct answer to this question?

The correct answer is: A single port can be a SPAN source for multiple SPAN sessions simultaneously. — Cisco switches have limits on the number of SPAN/RSPAN sessions, typically up to 2 local SPAN sessions and 1 RSPAN source session. A single port can be a source for multiple sessions, but a destination port can only be used in one session at a time. The source and destination ports must be on the same switch for local SPAN.

What should I do if I get this 350-401 question wrong?

What is the key concept behind this question?

Access ports place end devices into a single VLAN.

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Last reviewed: Jun 18, 2026

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