350-601 Network Practice Question
When configuring BGP EVPN on spine switches functioning as route reflectors, which two address families must be configured? (Choose two.)
⚠ Common exam trap
Cisco often tests the misconception that only the EVPN address family is needed, but the ipv4 unicast family is also required on the route reflector to advertise the underlay loopback routes that serve as VXLAN tunnel endpoints.
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
✓
address-family l2vpn evpn
B is correct because BGP EVPN (Ethernet VPN) uses the L2VPN address family (l2vpn evpn) to carry MAC/VXLAN routing information between spine and leaf switches. This address family is mandatory for EVPN control plane operation in a VXLAN fabric, enabling MAC address learning and advertisement via MP-BGP.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
address-family link-state
Why it's wrong here
Link-state is not a standard BGP address family for this context.
- ✓
address-family l2vpn evpn
Why this is correct
Required for EVPN route exchange.
- ✗
address-family ipv6 unicast
Why it's wrong here
Not required unless IPv6 underlay is used.
- ✗
address-family vpnv4
Why it's wrong here
vpnv4 is for MPLS Layer 3 VPNs, not VXLAN EVPN.
- ✓
address-family ipv4 unicast
Why this is correct
Needed for underlay routing (e.g., loopback reachability).
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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