1. Internetworking Introduction How Networks Differ How Networks Can Be Connected Concatenated Virtual Circuits Connectionless Internetworking Tunneling Fragmentation

2. Connecting Networks A collection of interconnected networks.

3. How Networks Differ Some of the many ways networks can differ. 5-43

4. How Networks Can Be Connected (a) Two Ethernets connected by a switch. (b) Two Ethernets connected by routers. In Physical layer, networks can be connected by repeater or hubs, which just move the bits from one network to an identical network. In data link layer, network can be connected by switch and bridge. They can accept frames, examine the MAC address, and forward the frames to a different network. In the network (IP) layer, we have routers that can connect two networks. In the transport and application we have gateways.

5. Concatenated Virtual Circuits Internetworking using concatenated virtual circuits.

6. Connectionless Internetworking A connectionless internet.

7. Tunneling Tunneling a packet from Paris to London.

8. Fragmentation (a) Transparent fragmentation. (b) Nontransparent fragmentation.