- A
EVPN IRB (Integrated Routing and Bridging) enables both Layer 2 and Layer 3 forwarding over the same EVPN instance using an anycast gateway.
Correct. IRB provides L2 and L3 with anycast gateway.
- B
Aliasing allows a PE to forward traffic to a multi-homed site even if it has not learned the MAC address, based on the ESI knowledge.
Correct. Aliasing uses ESI to forward.
- C
The Ethernet Segment Identifier (ESI) is a unique identifier for a multi-homed site, used to detect multi-homing and for split-horizon filtering.
Correct. ESI identifies the Ethernet segment.
- D
EVPN VPWS (Virtual Private Wire Service) uses a single EVPN instance for both point-to-point and multipoint services.
Why wrong: Incorrect. EVPN VPWS is point-to-point only.
- E
Designated Forwarder (DF) election is performed per (ESI, VLAN) to avoid duplicate traffic from multiple PEs to the CE.
Correct. DF per VLAN prevents duplicates.
350-501 MPLS and Segment Routing Practice Question
This 350-501 practice question tests your understanding of mpls and segment routing. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.
When deploying EVPN with SR-MPLS or SRv6, which THREE statements about EVPN multi-homing and related concepts are correct? (Choose three.)
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
EVPN IRB (Integrated Routing and Bridging) enables both Layer 2 and Layer 3 forwarding over the same EVPN instance using an anycast gateway.
EVPN multi-homing uses ESI to identify the Ethernet segment. DF election per (ESI, VLAN) ensures only one PE forwards traffic for a given VLAN. Aliasing allows load balancing to any PE even if not advertised all MACs. Options A, B, and D are correct.
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.
- ✓
EVPN IRB (Integrated Routing and Bridging) enables both Layer 2 and Layer 3 forwarding over the same EVPN instance using an anycast gateway.
- ✓
Aliasing allows a PE to forward traffic to a multi-homed site even if it has not learned the MAC address, based on the ESI knowledge.
Why this is correct
Correct. Aliasing uses ESI to forward.
Related concept
Access ports place end devices into a single VLAN.
- ✓
The Ethernet Segment Identifier (ESI) is a unique identifier for a multi-homed site, used to detect multi-homing and for split-horizon filtering.
Why this is correct
Correct. ESI identifies the Ethernet segment.
Related concept
Access ports place end devices into a single VLAN.
- ✗
EVPN VPWS (Virtual Private Wire Service) uses a single EVPN instance for both point-to-point and multipoint services.
Why it's wrong here
Incorrect. EVPN VPWS is point-to-point only.
- ✓
Designated Forwarder (DF) election is performed per (ESI, VLAN) to avoid duplicate traffic from multiple PEs to the CE.
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.
Visual reference
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 350-501 questions on switching, trunking, and access-port configuration.
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FAQ
Questions learners often ask
What does this 350-501 question test?
MPLS and Segment Routing — This question tests MPLS and Segment Routing — Access ports place end devices into a single VLAN..
What is the correct answer to this question?
The correct answer is: EVPN IRB (Integrated Routing and Bridging) enables both Layer 2 and Layer 3 forwarding over the same EVPN instance using an anycast gateway. — EVPN multi-homing uses ESI to identify the Ethernet segment. DF election per (ESI, VLAN) ensures only one PE forwards traffic for a given VLAN. Aliasing allows load balancing to any PE even if not advertised all MACs. Options A, B, and D are correct.
What should I do if I get this 350-501 question wrong?
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 350-501 questions on switching, trunking, and access-port configuration.
What is the key concept behind this question?
Access ports place end devices into a single VLAN.
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Last reviewed: Jul 4, 2026
This 350-501 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 350-501 exam.
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