CCNP CCNP Data Center 1 — Questions and Answers
Question 1: What is the default VTP mode on a Cisco Nexus switch?
- Transparent (Correct answer)
- Server
- Client
- Off
Correct answer: Transparent
Cisco Nexus switches default to VTP Transparent mode, which means they do not participate in VTP domain synchronization.
Question 2: What is the primary purpose of a vPC (Virtual Port Channel) in a Cisco data center?
- Allow a device to connect to two Nexus switches as a single logical port channel (Correct answer)
- Enable VXLAN encapsulation across the fabric
- Provide out-of-band management for Nexus switches
- Replace Spanning Tree Protocol entirely
Correct answer: Allow a device to connect to two Nexus switches as a single logical port channel
vPC allows a downstream device to connect to two Nexus switches simultaneously using a single logical port channel, eliminating blocked ports.
Question 3: Which link in a vPC setup carries control plane traffic between the two vPC peers?
- vPC peer keepalive link (Correct answer)
- vPC peer link
- Management link
- Fabric uplink
Correct answer: vPC peer keepalive link
The vPC peer keepalive link carries heartbeat messages to detect if the peer switch is alive, while the peer link carries data and control plane traffic.
Question 4: What is the role of the vPC peer link in a Cisco Nexus vPC pair?
- Carries BPDUs, multicast traffic, and orphan port traffic between peers (Correct answer)
- Provides out-of-band management connectivity
- Forwards all unicast traffic between the two switches
- Establishes the vPC domain ID
Correct answer: Carries BPDUs, multicast traffic, and orphan port traffic between peers
The vPC peer link carries BPDUs, multicast, and traffic destined for orphan ports, acting as the inter-switch link for control and some data plane functions.
Question 5: Which command is used to verify the vPC status and role on a Cisco Nexus switch?
- show vpc (Correct answer)
- show port-channel summary
- show vpc peer-keepalive
- show lacp neighbor
Correct answer: show vpc
The 'show vpc' command displays the vPC domain ID, role (primary/secondary), peer link status, and per-vPC consistency status.
Question 6: What happens to traffic on a vPC member port if the vPC peer link goes down but the peer keepalive link remains up?
- The secondary switch suspends its vPC member ports to avoid a split-brain scenario (Correct answer)
- Both switches continue forwarding traffic normally
- The primary switch suspends its vPC member ports
- All vPC ports on both switches are suspended
Correct answer: The secondary switch suspends its vPC member ports to avoid a split-brain scenario
When the peer link fails but the keepalive is up, the secondary switch suspends its vPC member ports to prevent dual-active forwarding loops.
CCNP CCNP Data Center 1
What is the default VTP mode on a Cisco Nexus switch?