350-601 Network Practice Question
An engineer is troubleshooting a BGP EVPN issue where leaf switches are not learning remote MAC addresses. The underlay is reachable and BGP sessions are established. What is a likely cause?
⚠ Common exam trap
Cisco often tests the distinction between a BGP session being 'established' and the specific address family being activated, leading candidates to overlook the missing 'address-family l2vpn evpn' under the neighbor configuration.
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
✓
Missing 'address-family l2vpn evpn' under the BGP neighbor configuration
Even when the underlay is reachable and BGP sessions are established, the BGP EVPN control plane requires the 'address-family l2vpn evpn' to be explicitly activated under the BGP neighbor configuration. Without this, the leaf switch will not exchange EVPN routes (Type-2 MAC/IP advertisement routes) with its peers, so remote MAC addresses are never learned. This is a common misconfiguration because BGP sessions may appear up but are not carrying the necessary EVPN address family.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Missing 'address-family l2vpn evpn' under the BGP neighbor configuration
Why this is correct
This address family must be activated to exchange EVPN routes.
- ✗
NVE interface not enabled
Why it's wrong here
NVE interface is needed for data plane, not control plane.
- ✗
Incorrect VNI configuration
Why it's wrong here
VNI mismatch would affect traffic but not BGP route learning.
- ✗
MTU mismatch on the underlay
Why it's wrong here
MTU could cause packet drops but not specific to EVPN routes.
Quick reference
Access Control Model Comparison
| Model | Acronym | Who Controls Access? | Best For |
|---|---|---|---|
| Discretionary Access Control | DAC | Resource owner | Small teams, file shares |
| Mandatory Access Control | MAC | System / security labels | Classified govt / military |
| Role-Based Access Control | RBAC | Administrator (via roles) | Enterprise environments |
| Attribute-Based Access Control | ABAC | Policy engine (user + resource attributes) | Fine-grained, dynamic policies |
| Rule-Based Access Control | RuBAC | System rules / ACLs | Firewall rules, network ACLs |
Go deeper
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 350-601 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 350-601 exam.