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At the backbone of your network, or at least where your critical resources are located, you ll probably incorporate some type of redundancy in your design This might include redundancy with your switches at layer 2, creating layer 2 loops in your network as shown in Figure 4-9 The problem with loops in your network is that when the switch floods certain types of traffic, such as broadcasts or multicasts, you don t want this traffic going around and around the loop forever, creating serious utilization problems Plus, for unknown destinations, as the frame is going around the loop, the switches update their CAM tables with the source address, which eventually shows up as connected to another connected switch, creating confusion about where the source device really is located For example, if a device is connected to Switch 3,

If you don t like the results of an adjustment layer after further editing, you can change the adjustment layer settings by double-clicking the icon in the Layers palette This reveals the dialog box for the adjustment layer,

FIGURE 4-9

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when the device generates a frame, Switch 3 adds the source MAC address to its CAM table and notes that it is connected to the incoming port If Switch 3 doesn t know where the destination is located, it will flood the frame to Switches 1 and 2 on its two uplink ports If both Switches 1 and 2 don t know where the destination is, they also flood the frame across the link between them, and will then flood it back to Switch 3 If multiple copies of the This presents a problem: When Switch 3 same unicast frame are transmitted in a receives these flooded frames and performs its switch network, it is probably because an learning function, it now looks as if the device unintentional loop exists in a redundant is connected to not the original port, but one of switch topology the two uplink ports to Switch 1 or 2

applying the test leads to points 10 and 11 immediately and discover that the circuit is OK all the way to the bulb holder At this point I d simply replace the bulb If you want to be sure it s the bulb and not the bulb holder, however, get out your multimeter and measure the resistance between the bulb contacts If the multimeter reads in nite ohms, you know you have the culprit a burned-out lament

Many network administrators forget that the first line of defense in securing their network devices includes protecting against physical and environmental threats, including the following:

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Restricting physical access to the router via physical measures, such as locked doors, key cards, video cameras, and so on Ensuring that equipment is protected from power surges/spikes, brownouts, and loss of power

Protecting equipment from temperatures that are too cold or too hot or from too much humidity Ensuring that you follow electrostatic discharge procedures when handling sensitive electronic parts, have spares on hand for critical parts, and properly label equipment and cables

Digital Photography Getting to Know Your PC and Correcting Images QuickSteps Enhancing PC QuickSteps

An in-depth discussion of these issues is beyond the scope of this book; however, it is covered in a little bit more depth in Cisco s Securing Network Devices (SND) course

The most common way of restricting physical access to IOS devices is to use some type of user authentication For example, you can configure passwords to restrict access to the lines on IOS devices (User EXEC mode) as well as access to Privilege EXEC mode Configuring passwords on Catalyst IOS switches, such as the 2950s and 2960s, is the same as configuring passwords on IOS routers The following sections discuss the configuration of passwords on IOS devices

Controlling access to User EXEC mode on an IOS device is accomplished on a line-by-line basis: console, auxiliary, TTYs, and VTYs Remember that not all devices support auxiliary ports, only routers support TTYs, and the number of VTYs an IOS device supports is product-dependent, ranging from five VTYs (0 4) to almost a thousand To secure the console port, you must first go into the console s Line Subconfiguration mode with the line console 0 command to configure the line password:

To delete any layer in the Layers palette, select it and drag it to the trashcan icon in the upper-left corner of the palette

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