Review of TCP/IP Internetworking Chapter 3

Single Network: applications, client and server hosts, switches, access links, trunk links, frames, path Path Frame Server Host Client Host Trunk Link Access Link Server Host Mobile Client Host

Frame Organization Frame Trailer Data Field Header Destination Address Other Header Field Destination Address Field Message Structure

Switching Decision Switch receives A frame, sends It back out Based on Destination Address 1 2 3 4 5 6 Switch Frame with Station C In the destination Address field Station A Station B Station C Station D

Figure 3-1: Internet An internet is two or more individual switched networks connected by routers Switched Network 1 Switched Network 3 Router Switched Network 2

Figure 1.11: An Internet Multiple Networks Connected by Routers Path of a Packet is its Route Single Network Routers Packet Route Single Network

Figure 1.13: The Internet The global Internet has thousands of networks Figure 1.13: The Internet Network Webserver Software Browser Packet Packet Router Route Router Router Packet

Figure 3-6: Frames and Packets Carrying Packet in Network 1 Packet Router A Frame 2 Carrying Packet in Network 2 Switch Client PC Frame 3 Carrying Packet in Network 3 Packet Switch Router B Server

Figure 1.12: Frames and Packets Like passing a shipment (the packet) from a truck (frame) to an airplane (frame) at an airport. Receiver Shipper Same Shipment Airport Airport Truck Truck Airplane