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Network segment A portion of a network on which all the traffic is shared through a shared hub or through shared-wire technologies such as coax (10Base-2 Ethernet)
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Standard switches are multiport bridges, which means they selectively broadcast packets according to their Ethernet hardware address They are also called layer 2 switches because the network card s hardware address is within the second layer of the OSI/ISO model However, because the majority of the traffic on these networks is IP based, it makes sense to use IP as the basis for the routing and distribution of network packets Layer 3 switches, therefore, improve on the Layer 2 model by allowing the switch to route and redirect packets according to their destination IP address, which allows the router to make more specific decisions about the best port over which to send the packet
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Seven-layer model The OSI/ISO seven-layer model for networking defines different layers for different aspects of the network, from the physical right up to the application level protocols Interestingly, although the lower levels (one to three) are easily defined, protocols in the upper levels (four through seven) are not so easily pigeonholed into a specific layer Because the routing is handled in hardware, the overall throughput is very fast, easily matching the underlying transmission speed Nonlayer 3 traffic is still forwarded, but its destination is determined by the layer 3 routing
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CHAPTER 4 Planning, Implementing, and Maintaining a Network Infrastructure
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The benefit of the layer 3 switch is that it can be used to help route and redirect IP traffic at a network level without the specific use of routers This makes a layer 3 switch a multiport router, but at a much more affordable price than the normal router-based solutions used with multiport networks Layer 3 switches are currently used on corporate backbones to route and separate traffic between large network groups and segments They can also route foreign network traffic (such as branch offices and the Internet) without expensive routers or computer-based routing solutions In addition, layer 3 switches help interconnect and support virtual LANs
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Virtual LANs (VLANs) build on the facilities offered by switches, and particularly layer 3 switches, to provide a virtual LAN within the confines of a large hardware network For example, imagine a network with 20 nodes that you want to separate into two networks, completely isolating and localizing the network traffic but still allowing communication between the two networks You could do this by using switches and a router to separate the networks, or you could use one big switch that supported virtual LANs Because the switch creates one-to-one communication channels between the devices, it s already acting as a router With some additional software built into the switch, it can create logical networks made up of any number of devices connected to the switch See Figure 41 for an example Each device within the virtual LAN can be part of the same broadcast domain, and the VLAN as a whole can have its traffic monitored and controlled just as if it were a stand-alone network Other benefits include
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More bandwidth Because the LANs are physically separate networks, you get all the benefits of a separate switch, including segmented broadcast and multicast traffic
FIGURE 41
Virtual LANs in practice
MCSE Planning a Windows Server 2003 Network Infrastructure
Easier to manage The devices are connected to the same switch and you can reconfigure device membership on-the-fly, so devices can be moved to different VLANs as required Removes physical limitations In a complex network, it can be difficult to logically separate or combine networks that are otherwise physically separate For example, an administration department would normally share a network, but what if they are in two different buildings With a VLAN they can be logically organized, irrespective of their location Easier resource sharing Any device can be a member of more than one VLAN, so you can share a server over more than one network segment without having to use complex routing, metric, or hardware setups Performance management You can easily upgrade performance by separating clients into new VLANs without adding complexity or hardware to your network
VLANs are still a relatively new technology, but they are gaining acceptance because of the benefits just listed In particular, the ability to simply connect machines together in large corporate environments through one or more central hardware points while still being able to reconfigure and manage the network structure through software provides a significant advantage
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