This letcture will explore the Transport layer protocols TCP and UDP in detail. It will also look at the use of port numbers as layer 4 addressing.

This lecture will examine the ICMP, a helper protocol which supports IP in error reporting and simple network queries.

This lecture will use wireshark to examine the the TCP header fields using ftp and the UDP header fields using tftp.

This lab will use Wireshark to examine the 3-Way Handshake.