350-501 Architecture Practice Question
A service provider is deploying EVPN-MPLS for L2VPN services. The customer requires that MAC addresses learned from one PE are not advertised to other PEs unless they are active. Which EVPN route type is used for MAC address withdrawal?
⚠ Common exam trap
Cisco often tests the distinction between Route Type 2 for individual MAC withdrawal and Route Type 1 for mass Ethernet segment withdrawal, leading candidates to confuse the two when the question specifies 'MAC addresses learned from one PE' rather than a segment-level failure.
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
✓
Route Type 2: MAC/IP Advertisement
EVPN Route Type 2 (MAC/IP Advertisement) carries both MAC addresses and their associated IP addresses, and it supports a 'sticky' or 'withdraw' mechanism via the BGP Withdraw message. When a MAC address becomes inactive on a PE, the PE sends a BGP Withdraw for the specific Route Type 2 route, effectively removing that MAC from the control plane of other PEs. This ensures that only active MAC addresses are advertised, meeting the customer requirement.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Route Type 5: IP Prefix
Why it's wrong here
Type 5 is for inter-subnet forwarding, not MAC withdrawal.
- ✗
Route Type 1: Ethernet Auto-Discovery (A-D)
Why it's wrong here
A-D routes are used for redundancy and aliasing, not MAC withdrawal.
- ✓
Route Type 2: MAC/IP Advertisement
Why this is correct
MAC addresses are advertised in Type 2 routes; withdrawal is done by withdrawing the route.
- ✗
Route Type 3: Inclusive Multicast Ethernet Tag
Why it's wrong here
Type 3 is for multicast forwarding, not MAC withdrawal.
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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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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