AwildaVazquez CET2607-12 Week1

O the port may be on blocking state compare and

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o The port may be on blocking state Compare and contrast a bridge and a switch. Switches (Layer-2 Switching) are a lot smarter than hubs and operate on the second layer of the OSI model. What this means is that a switch won't simply receive data and transmit it throughout every port, but it will read the data and find out the packet's destination by checking the MAC address. The destination MAC address is located always at the beginning of the packet so once the switch reads it, it is forwarded to the appropriate port so no other node or computer connected to the switch will see the packet. Switches use Application Specific Integrated Circuits (ASIC's) to build and maintain filter tables. Layer-2 switches are alot faster than routers cause they dont look at the Network Layer (thats Layer-3) header or if you like, information. Instead all they look at is the frame's hardware address (MAC address) to determine where the frame needs to be forwarded or if it needs to be dropped. If we had to point a few features of switches we would say: They provide hardware based bridging (MAC addresses) They work at wire speed, therefor have low latency They come in 3 different types: Store & Forward, Cut-Through and Fragment Free (Analysed later) Bridges are really just like switches, but there are a few differences which we will mention, but not expand upon. These are the following: Bridges are software based, while switches are hardware based because they use an ASICs chip to help them make filtering decisions. Bridges can only have one spanning-tree instance per bridge, while switches can have many. Bridges can only have upto 16 ports, while a switch can have hundreds !
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  • Summer '13
  • Network switch, MAC address, switch, Switches, CCNA Study Guide.

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