Layer Function Data Link Transmits data across a single network. This layer also receives data routed from the Internet layer and transmits the data to its destination. Internet Moves data around the internetwork. The Internet Protocol routes packets across networks independently of the network medium. It also encapsulates datagram headers, sends ICMP error and control messages, and maps ARP address conversions.
Transport Provides a flow of data between two hosts.
Finger utility to display user information.