Network Layer Protocols
The Network Layer is essentially the routing layer, where the main purpose is to get packets (datagrams) from one network to another. Within the same network (LAN or wireless LAN [WLAN]), Layer 2 addressing can be used to forward a frame to its destination. However, when a frame is addressed to a host on another network, the frame must be handed up to Layer 3 and prepared for transmission on a LAN, WAN, or the Internet.
Much of the work performed by network administrators and technicians involves IP addressing, subnetting or supernetting, routing protocols, firewall rules, access control lists (ACLs), and quality of service (QoS). IP is the best known of the Layer 3 protocols, because it defines internetwork addressing; ...
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