1. Review of TCP/IP Internetworking
Chapter 3

2. 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

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

4. 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

5. 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

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

7. 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

8. 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

9. 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