Switches can replace the hub, breaking up collision domains.
Keep in mind that the hub used in the figure just extended the one collision domain from the switch port.
Here’s a list of some of the things that commonly cause LAN traffic congestion:
- Too many hosts in a broadcast domain
- Broadcast storms
- Multicasting
- Low bandwidth
- Adding hubs for connectivity to the network
- A bunch of ARP or IPX traffic (IPX is a Novell protocol that is like IP, but really, really chatty. Typically not used in today’s networks.)
Routers create an internetwork.There are two advantages of using routers in your network:
- They don’t forward broadcasts by default.
- They can filter the network based on layer 3 (Network layer) information (e.g., IP address).
Four router functions in your network can be listed as follows:
- Packet switching
- Packet filtering
- Internetwork communication
- Path selection
Internetworking devices
Switched networks creating an internetwork
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