NE NE Network Virtualization 1

Question 1

What does SDN (Software-Defined Networking) fundamentally separate within a network architecture?

Accepted Answer

Control plane from the data plane

Answer

SDN separates the control plane (decision-making logic) from the data plane (packet forwarding), enabling centralized, programmable network management.

Question 2

Which protocol is most commonly used as the southbound API in SDN for communication between an SDN controller and network forwarding devices?

Accepted Answer

OpenFlow

Answer

OpenFlow is the primary southbound API protocol that allows SDN controllers to program the forwarding tables of network devices.

Question 3

What is the primary purpose of VXLAN (Virtual Extensible LAN)?

Accepted Answer

To extend Layer 2 networks over a Layer 3 infrastructure

Answer

VXLAN encapsulates Layer 2 Ethernet frames in UDP packets, allowing Layer 2 network segments to span a Layer 3 routed infrastructure.

Question 4

What is the IANA-assigned standard UDP destination port used by VXLAN?

Accepted Answer

4789

Answer

IANA assigned UDP port 4789 as the standard VXLAN destination port, though some early implementations used 8472.

Question 5

What does NFV (Network Functions Virtualization) primarily aim to achieve?

Accepted Answer

Run network functions as software on commodity hardware

Answer

NFV enables network functions such as firewalls, load balancers, and routers to run as software (VNFs) on standard commodity servers instead of dedicated proprietary appliances.

NE - Network Engineer Practice Test

NE - Network Engineer Practice Test

NE NE Network Virtualization 1