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Basic Switch Configuration
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4 C The ip default-gateway command is a Global configuration mode command A is incorrect because the Interface mode is used to assign an IP address to a VLAN interface B is incorrect because Line mode is used to restrict User EXEC access to the switch D is a nonexistent configuration mode 5 Here is how to configure the switch to allow it to reach other subnets:
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interface vlan 5 ip address 1921681125 255255255128 exit ip default-gateway 1921681126 Notice that the subnet mask is not /24, but /25!
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6 show mac-address-table allows you to see the contents of the port address table 7 A Unknown unicast destination MAC addresses are flooded B is true of routers, not switches C and D are incorrect because the frame is flooded since the destination is unknown
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8 A Port security is used to prevent unauthorized access to a LAN B is incorrect because 8021Q is a VLAN trunking protocol C and D are used to restrict access to the switch, not to the LAN for which the switch provides connectivity 9 C Dynamic, not sticky, learning is the default A, B, and D are defaults and thus incorrect 10 D You should statically define MAC addresses of servers and routers when using port security A and C are used for user ports B is a nonexistent learning mode
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1301 1302 1303 VLAN Overview VLAN Connections VLAN Trunk Protocol 1304 VLAN Configuration Two-Minute Drill Self Test
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13: VLANs and Trunks
s was mentioned in s 2 and 4, layer 2 devices, including bridges and switches, always propagate certain kinds of traffic in the broadcast domain: broadcasts, multicasts, and unknown destination traffic This process impacts every machine in the broadcast domain (layer 2 network) It impacts the bandwidth of these devices connections as well as their local processing If you were using bridges, the only solution available to solve this problem would be to break up the broadcast domain into multiple broadcast domains and interconnect these domains with a router With this approach, each new broadcast domain would be a new logical segment and would need a unique network number to differentiate it from the other layer 3 logical segments Unfortunately, this is a costly solution, since each broadcast domain, each logical segment, needs its own port on a router The more broadcast domains that you have from bridges, the bigger the router required: an interface for each broadcast domain As you will see in this chapter, switches also have the same problem with traffic that must be flooded You will see, however, that switches have a unique solution to reduce the number of router ports required and thus the cost of the layer 3 device that you need to obtain: virtual LANs and trunking
CERTIFICATION OBJECTIVE 1301
VLAN Overview
A virtual LAN (VLAN) is a logical grouping of network devices in the same broadcast domain that can span multiple physical segments The top part of Figure 13-1 shows an example of a simple VLAN, where every device is in both the same collision and broadcast domains In this example, a hub is providing the connectivity, which represents, to the devices connected to it, that the segment is a logical segment The bottom part of Figure 13-1 shows an example of a switch with four PCs connected to it One major difference between the switch and the hub is that all devices connected to the hub are in the same collision domain, whereas in the switch example, each port of the switch is a separate collision domain By default, all ports on a switch are in the same broadcast domain In this example, however, the configuration of the switch places PC-E and PC-F in one broadcast domain (VLAN) and PC-G and PC-H in another broadcast domain Switches are used to create VLANs, or separate broadcast domains VLANs are not restricted to any physical boundary in the switched network, assuming that all
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