350-601 Network Practice Question
A network engineer notices that when a host sends a packet to a destination on a different VTEP, the packet is flooded to all VTEPs even though the destination MAC is known. What is the most likely cause?
⚠ Common exam trap
Watch out — candidates often confuse flooding due to an unknown MAC (which is normal) with flooding due to a missing EVPN route, or they incorrectly attribute the issue to ARP suppression or MTU problems, which are unrelated to the data-plane flooding of a known MAC across VTEPs.
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 BGP EVPN route table is missing the MAC/IP route for the destination.
In a BGP EVPN VXLAN fabric, when a host sends a packet to a known destination MAC on a different VTEP, the ingress VTEP should perform MAC/IP route lookup in the BGP EVPN route table to determine the correct remote VTEP. If the MAC/IP route for the destination is missing (e.g., not advertised or withdrawn), the ingress VTEP has no mapping to a remote VTEP and must flood the packet to all VTEPs in the VNI, causing unnecessary broadcast traffic. This is the most likely cause of the described behavior.
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 BGP EVPN route table is missing the MAC/IP route for the destination.
Why this is correct
Without the route, the VTEP has no forwarding information and floods.
- ✗
The VNI is misconfigured.
Why it's wrong here
VNI misconfiguration would cause connectivity failure, not flooding.
- ✗
The MTU exceeds 1500 bytes.
Why it's wrong here
MTU issues cause packet drops, not flooding.
- ✗
ARP suppression is disabled.
Why it's wrong here
ARP suppression reduces broadcast ARP, not known unicast flooding.
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.