NE NE Network Virtualization 3

Question 1

What is the VNI (VXLAN Network Identifier) used for in a VXLAN deployment?

Accepted Answer

Uniquely identifying a VXLAN segment, similar in concept to a VLAN ID

Answer

The VNI is a 24-bit identifier in the VXLAN header that uniquely identifies the virtual network segment, supporting up to approximately 16 million unique segments.

Question 2

What does EVPN (Ethernet VPN) provide in a VXLAN-based network virtualization environment?

Accepted Answer

A BGP-based control plane for distributing MAC and IP reachability information

Answer

EVPN provides a standards-based BGP control plane for distributing MAC address and IP reachability information, enabling efficient operation of VXLAN overlays.

Question 3

What is Service Function Chaining (SFC) used for in NFV architectures?

Accepted Answer

Defining an ordered sequence of virtual network functions that traffic must traverse

Answer

Service Function Chaining (SFC) allows network engineers to define and enforce an ordered sequence of VNFs (e.g., firewall → IDS → load balancer) that specific traffic flows must pass through.

Question 4

In VXLAN, how is BUM (Broadcast, Unknown unicast, Multicast) traffic typically handled?

Accepted Answer

It is replicated to all VTEPs via multicast groups or ingress replication

Answer

BUM traffic in VXLAN is handled using either IP multicast (mapping VNIs to multicast groups) or ingress replication (head-end replication), where the sending VTEP sends a copy to each known remote VTEP.

Question 5

In a leaf-spine data center fabric architecture, what is the primary role of leaf switches?

Accepted Answer

Connecting servers and end devices to the network fabric

Answer

Leaf switches serve as the access layer in a leaf-spine architecture, connecting servers, storage, and other endpoints to the spine layer for any-to-any connectivity.

NE - Network Engineer Practice Test

NE - Network Engineer Practice Test

NE NE Network Virtualization 3