Networking network layer
From wikinotes
Routes packets to ip addresses.
Unlike the physical/datalink layers which get stripped off and replaced as the information passes through different networks, the network layer always stays the same.
The network layer speaks a specific protocol. The internet (the one that serves you websites) uses TCP/IP. All nodes in a TCP/IP network are assigned a globally unique address (within that network) so that other hosts can find it.
Tools
ping traceroute tcpdump
Protocols
ipv4 ipv6
