Most-Asked SD-WAN Interview Questions

SD-WAN (Software-Defined Wide Area Network) is a transformative approach to networking that simplifies management, enhances performance, and reduces costs compared to traditional WAN architectures. Below are the 50 most common interview questions about SD-WAN, followed by practical insights and commands.

You Should Know:

1. Basic SD-WAN Commands (Cisco vManage/vEdge)

Check device status:
```
show device status
```
View OMP peers:
```
show omp peers
```
Verify tunnel establishment:
```
show tunnel statistics
```
Check control connections:
```
show control connections
```

2. Zero-Touch Provisioning (ZTP) Setup

Configure ZTP on vEdge:

config-transaction
ztp interface eth0
commit

Verify ZTP status:
```
show ztp status
```

3. Dynamic Path Selection & Policies

Create an application-aware routing policy:

policy app-route POLICY_NAME
sequence 10
match app-list BUSINESS_APPS
action accept
set preferred-color MPLS
commit

Monitor path selection:
```
show policy service-path
```

4. Troubleshooting SD-WAN

Check dropped packets:
```
show interface packets
```
Debug OMP routes:
```
debug omp routes
```

Capture traffic on vEdge:

monitor capture CAPTURE_NAME interface eth0

5. Security & Segmentation

Enable IPsec encryption:

security ipsec profile IPSEC_PROFILE
encryption aes256
authentication sha512

Apply segmentation with VRFs:

vrf definition VRF_NAME
rd 100:1
route-target export 100:1
route-target import 100:1

What Undercode Say:

SD-WAN revolutionizes enterprise networking by decoupling control and data planes, enabling automation, and improving cloud performance. Mastering CLI commands (vManage, vEdge) is crucial for deployment and troubleshooting. Key takeaways:
– Use `show` commands for real-time monitoring.
– Leverage `ZTP` for scalable deployments.
– Implement `application-aware routing` for optimal performance.
– Secure traffic with `IPsec` and VRF segmentation.

Expected Output:

show omp routes 
show policy service-path 
debug sdwan packet-drop

For further reading, refer to:

References:

Reported By: Shamseer Siddiqui – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅

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