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But these loops also create problems For instance, a bridge always floods traffic that has a destination address that is an unknown unicast, a broadcast, or a multicast address And this traffic will continually circle around the loop possibly forever For example, in Figure 4-1, assume that a PC generates a broadcast on Segment1 When BridgeA and BridgeB receive the broadcast, they flood it out all of their remaining ports This means that the same broadcast will appear twice on Segment2 Each bridge sees the other s broadcast on Segment2 and forwards this back to Segment1 This process will go on ad infinitum This process not only wastes bandwidth on your LAN segments but also affects the CPU cycles of all devices on these segments, since all NICs will accept the broadcast and pass it up the protocol stack for further processing STP is used to remove loops in your layer 2 network When STP runs, one of the ports of the bridges in a loop is disabled in software In Figure 4-1, this is the port on BridgeB that is connected to Segment2 Any user traffic is ignored if it is received on this port and is not forwarded out of this port Going back to our broadcast example, if a PC on Segment1 generated a broadcast, both bridges, again, would receive it BridgeA would flood the broadcast to Segment2, but BridgeB would not, since the port is in a blocked state STP is discussed in much more depth in 14

Switches, like bridges, operate at the data link layer The three main functions of a bridge are also true of a switch: they learn, forward, and remove loops However, switches have many more features than bridges; for instance, they make their switching decisions in hardware by using application-specific integrated circuits (ASICs) ASICs are specialized processors built to perform very few specific tasks Because they do only a few things, ASICs are much more cost-effective than a generic processor, such as the one in your PC Cisco, like most networking vendors, extensively uses ASICs throughout its switching products

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The main function of bridges and switches is to solve bandwidth, or collision, problems Remember that in Ethernet, multiple devices can share the same segment, so there is a chance that more than one device might try to transmit at the same

time, creating a collision and a retransmission The more devices you have in a shared medium, the more likely collisions will occur In the old days of networking you used hubs to connect devices together or used 10Base5 or 10Base2 cabling (where many devices would share one wire) If you experienced constant or excessive amounts of collisions, you could use bridges (and later on, switches) to break up the user devices to multiple physical segments, where each segment would have fewer users and thus fewer collisions You could also use a router to perform this function; however, the disadvantage of a router is that it costs a lot more than a bridge or switch This section provides a brief overview of bridges and switches

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Hubs cannot solve bandwidth or collision problems Bridges and switches, on the other hand, can Bridges and switches take one large collision domain and split it into a bunch of smaller ones In this sense, they create extra

collision domains, since each interface of the layer 2 device is a separate collision domain This process is called microsegmentation Routers, at the network layer, can also solve collision problems, but they cost more than bridges or switches

Even though bridges and switches both operate at layer 2, there are many differences between them Switches have many advantages over bridges, including the following:

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ous examples In both Figures 212 and 213, fourteen points to which we could connect test leads are numbered As we troubleshoot the circuit, we will connect our test light to pairs of these points to see whether voltage is present

Full-duplex support to allow a device to send and receive simultaneously Support for different Ethernet speeds on different switch ports, such as

Fragment-free switching is a modified form of cut-through switching Whereas cut-through switching reads up to the destination MAC address field in the frame before making a switching decision, fragment-free switching makes sure that the frame is at least 64 bytes long before switching it (64 bytes is the minimum legal size of an Ethernet frame) The goal of fragment-free switching is to reduce the number

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