350-501 Architecture Practice Question
A service provider is implementing EVPN for its VPLS replacement. They have configured BGP EVPN on all PEs and have set up an EVPN instance for a customer requiring broadcast, unknown unicast, and multicast (BUM) traffic. The customer reports that broadcast traffic from one site is not being received at another site. The engineer checks the EVPN configuration and finds that the EVI is configured correctly, the route-target matches, and the BGP sessions are established. The engineer also checks the MAC address table on the receiving PE and sees that the source MAC of the broadcast frame is learned on the local interface, but not from the remote VTEP. The engineer suspects an issue with the IMET (Inclusive Multicast Ethernet Tag) route. Which action should the engineer take to verify the IMET route?
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
✓
Check the BGP EVPN route table for IMET (route-type 3) routes using 'show bgp l2vpn evpn route-type 3'.
'show bgp l2vpn evpn route-type 3' displays the IMET (Inclusive Multicast Ethernet Tag) routes, which are necessary for forwarding BUM traffic between VTEPs. Option A is incorrect because 'show evpn instance detail' shows local EVI configuration but not remote IMET routes. Option C is incorrect because route-type 2 is for MAC/IP advertisement, not IMET. Option D is incorrect because 'show l2vpn vfi' is used for VPLS, not EVPN.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Use 'show evpn instance detail' to check the EVI configuration.
Why it's wrong here
This shows local EVPN instance details but does not validate remote IMET routes.
- ✓
Check the BGP EVPN route table for IMET (route-type 3) routes using 'show bgp l2vpn evpn route-type 3'.
Why this is correct
IMET routes are route-type 3 in EVPN; checking their presence and reachability is essential for BUM traffic.
- ✗
Use 'show bgp l2vpn evpn route-type 2' to verify MAC/IP routes.
Why it's wrong here
Route-type 2 is for MAC/IP advertisement, not for BUM flooding.
- ✗
Use 'show l2vpn vfi' to verify the VPLS forwarding instance.
Why it's wrong here
VFI is used for VPLS, not EVPN.
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
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