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350-401 Practice Question: An architect is designing an SD-Access fabric for…
An architect is designing an SD-Access fabric for a campus that requires high availability. The design must ensure that if one fabric edge node fails, endpoints can be re-homed to another edge node without manual intervention. Which feature should be implemented?
⚠ Common exam trap
Cisco often tests the misconception that traditional FHRPs like HSRP or VRRP are sufficient for high availability in SD-Access, but the trap is that these protocols introduce failover delays and active/standby limitations, whereas SD-Access requires anycast Layer 2 gateway for instantaneous, protocol-free re-homing across multiple active edge nodes.
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
✓
Anycast Layer 2 gateway
Anycast Layer 2 gateway is the correct feature because it allows multiple fabric edge nodes to share the same anycast IP and MAC address for a given VLAN. If one edge node fails, endpoints simply continue using the same gateway address, and their traffic is automatically forwarded to a surviving edge node via the fabric's underlay routing, requiring no manual intervention or protocol convergence.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Anycast Layer 2 gateway
Why this is correct
Anycast L2 gateway provides high availability by allowing multiple edge nodes to serve the same gateway.
- ✗
HSRP
Why it's wrong here
HSRP is a first-hop redundancy protocol but is not used in SD-Access fabric; anycast gateway is preferred.
- ✗
VRRP
Why it's wrong here
VRRP is similar to HSRP and not used in SD-Access fabric.
- ✗
GLBP
Why it's wrong here
GLBP is another FHRP not used in SD-Access; anycast gateway is the standard.
Visual reference
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 |
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Last reviewed: Jun 24, 2026
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