Cisco ENCOR Network Virtualization 1 — Questions and Answers
Question 1: Which protocol is used as the data plane encapsulation in VXLAN overlays?
- GRE
- UDP (Correct answer)
- TCP
- ESP
Correct answer: UDP
VXLAN encapsulates Layer 2 frames inside UDP packets, using destination port 4789 by default.
Question 2: What is the VXLAN Network Identifier (VNI) field size?
- 8 bits
- 16 bits
- 24 bits (Correct answer)
- 32 bits
Correct answer: 24 bits
The VNI is a 24-bit field, allowing up to 16 million unique overlay segments.
Question 3: In a Cisco SD-WAN fabric, which component is responsible for centralized policy and management?
- vEdge
- vSmart
- vBond
- vManage (Correct answer)
Correct answer: vManage
vManage is the centralized NMS/orchestrator for Cisco SD-WAN, handling policy, monitoring, and configuration.
Question 4: Which Cisco SD-WAN component acts as the orchestrator and facilitates initial authentication of WAN Edge routers?
- vManage
- vSmart
- vBond (Correct answer)
- vAnalytics
Correct answer: vBond
vBond is the orchestration plane component that authenticates and redirects WAN Edge devices to vSmart and vManage.
Question 5: What technology does LISP use to separate host identity from its location?
- EID and RLOC (Correct answer)
- VNI and VTEP
- VRF and RD
- MPLS and LDP
Correct answer: EID and RLOC
LISP separates the Endpoint Identifier (EID) from the Routing Locator (RLOC) to enable scalable mobility.
Question 6: Which plane in an SD-WAN architecture distributes OMP routing information between WAN Edge devices?
- vBond (orchestration plane)
- vManage (management plane)
- vSmart (control plane) (Correct answer)
- vEdge (data plane)
Correct answer: vSmart (control plane)
vSmart controllers form the control plane, running OMP to distribute routing, policy, and key information to WAN Edge routers.
Cisco ENCOR Network Virtualization 1
Which protocol is used as the data plane encapsulation in VXLAN overlays?