350-601 Network Practice Question
Which protocol is used to carry VXLAN encapsulation and facilitates the exchange of MAC reachability information between VTEPs in a VXLAN EVPN fabric?
⚠ Common exam trap
Cisco often tests the distinction between the control plane (MP-BGP) and the data plane (VXLAN) or underlay protocols (OSPF, PIM), leading candidates to mistakenly choose OSPF or PIM for MAC reachability exchange.
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
✓
MP-BGP
In a VXLAN EVPN fabric, MP-BGP (Multiprotocol BGP) is the control plane protocol used to advertise MAC reachability information between VTEPs. It carries VXLAN encapsulation information via the BGP EVPN address family (AFI L2VPN / SAFI EVPN), enabling VTEPs to learn remote MAC addresses and VNI mappings without relying on data-plane flooding.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
eBGP
Why it's wrong here
eBGP can be used for underlay routing but MP-BGP is the overlay control plane for EVPN.
- ✗
OSPF
Why it's wrong here
OSPF is an IGP, not used for VXLAN control plane.
- ✓
MP-BGP
Why this is correct
MP-BGP with EVPN address family carries MAC/VNI routes between VTEPs.
- ✗
PIM
Why it's wrong here
PIM is used for multicast, not for MAC reachability in VXLAN 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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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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