ITM 301 Chapter 3: Chapter 3

• School: Ryerson University
• Department: Information Technology Management
• Course: ITM 301
• Professor: Franklyn Prescod

Document Summary

Tcp/ip a suite of protocols including: Tcp, ip, udp, arp, and many others. Protocols add a header to data inherited from the layer above. Layers 7,6, and 5 data and instructions, known as payload, are generated by applications running on source host. Layer 4 usually tcp or udp adds a header to the payload. Includes a port number to identify the receiving app. Layer 3 network layer adds it own header and becomes a packet. Layer 2 packet is passed to data link layer on nic, which encapsulates data with its own header and trailer, creating a frame. Layer 1 physical layer on the nic receives the frame and places the transmission on the network. Receiving host de-encapsulates the message at each layer in reverse order and presents the payload to the receiving applications. Connectivity devices are specialized devices that allow two or more networks or multiple parts of one network to connect and exchange data.