Cisco ENCOR Network Virtualization 3

Question 1

Which header field uniquely identifies a VXLAN segment and is carried in the VXLAN header?

Accepted Answer

VNI (VXLAN Network Identifier)

Answer

The 24-bit VNI in the VXLAN header identifies the individual virtual network segment.

Question 2

In Cisco SD-WAN, which protocol is used between vSmart controllers and WAN Edge routers to exchange routes and policies?

Accepted Answer

OMP

Answer

OMP (Overlay Management Protocol) is Cisco's proprietary SD-WAN control plane protocol used between vSmart and WAN Edge devices.

Question 3

What is a key advantage of using VXLAN over traditional VLANs in large data centers?

Accepted Answer

Support for up to 16 million segments vs 4,096 VLANs

Answer

VXLAN's 24-bit VNI supports ~16 million segments compared to the 4,094 usable VLANs in 802.1Q.

Question 4

Which component in an NFV architecture is responsible for lifecycle management of VNFs?

Accepted Answer

VNFM

Answer

The VNF Manager (VNFM) handles instantiation, scaling, update, and termination of VNF instances.

Question 5

In LISP, what does the ITR do when it cannot find an EID-to-RLOC mapping in its cache?

Accepted Answer

Sends a Map-Request to the Map Resolver

Answer

When the ITR has a cache miss, it sends a Map-Request to the Map Resolver to obtain the EID-to-RLOC mapping.

Cisco ENCOR Practice Test