5.0 Introduction

Question 1

NETWORK LAYER

Answer 1

The network layer, or OSI Layer 3, provides services to allow end devices to exchange data across networks.

Question 2

NETWORK LAYER PROTOCOLS

Answer 2

IPv4 and IPv6 are the principal network layer communication protocols.
Network layer protocols perform four operations:
addressing end devices,
encapsulation,
routing
de-encapsulation.