ITM 301 Lecture : Chapter 5 The Network Layer

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

Document Summary

Network layer: is concerned with getting packets from the source all the way to destination. The network layer is the lowest layer that deals with end to end transmissions. The major components of the network are the isps equipment (routers connected by transmission lines). Store-and-forward packet switching: a host with a packet to send transmits it to the nearest router, either on its own lan or over a point to point link to the isp. The packet is stored there until it has fully arrived and the link has finished its processing by verifying the checksum. Then it is forwarded to the next router along the path until it reaches the destination host, where it is delivered. The network layer provides services to the transport layer at the network layer/transport layer interface. If connectionless services are offered, packets are injected into the network individually and routed independently of each other; no setup is needed.