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Serial Interfaces on Routers
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When connecting a serial cable to the serial interface of a router, clocking is typically provided by an external device, such as a modem or a channel service unit/data service unit (CSU/DSU) The router is the data termination equipment (DTE) and the external device is the data communications equipment (DCE), where the DCE provides the clocking This type of WAN connection is discussed in 25 In some cases, however, you might connect two routers back-to-back using the routers serial interfaces For instance, if you are building your own lab to practice CCNA commands, you ll more than likely connect the routers back-to-back to reduce equipment costs In this situation, each router, by default, is a DTE Since clocking is required for the interface to be enabled, one of the two routers will have
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to perform the function of an external DCE This is accomplished by using the clock rate Interface Subconfiguration mode command on the serial interface:
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Router(config)# interface serial [slot_#/]port_# Router(config-if)# clock rate rate_in_bits_per_second
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When entering the clock rate, you can t choose any arbitrary value Use contextsensitive help to find out which clock rates your serial interface supports Here are some possible values: 1200, 2400, 4800, 9600, 19200, 38400, 56000, 72000, 125000, 148000, 500000, 800000, 1000000, 1300000, 2000000, and 4000000 Note that that you can t choose an arbitrary router in the back-to-back connection to be the DCE this is based on how the two routers are cabled One end of the cable is physically the DTE, and the other is the DCE Some cables are marked and some are not, depending on where they were purchased If you are not sure which router has the DTE end of the cable and which has the DCE end, you can determine this with the show controller command:
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Router> show controller serial [slot_#/]port_#
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This is one of the few commands in which you cannot concatenate the type and the port number you must separate them by a space Here is an example of the use of this command:
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Router> show controller serial 0 HD unit 0, idb = 0x121C04, driver structure at 0x127078 buffer size 1524 HD unit 0, DTE V35 serial cable attached
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Notice that the second line of this example holds two important pieces of information: the connection type (DTE) and the type of cable (V35) Here is an example of an interface connected to the end of a DCE cable:
Router> show controller serial 0 HD unit 0, idb = 0x1BA16C, driver structure at 0x1C04E0 buffer size 1524 HD unit 0, V35 DCE cable, clockrate 64000
In this example, the clocking has already been configured: 64,000 bps (bits per second)
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Basic IOS Security Con guration
Use the show controller command to determine DTE and DCE connections Use the clock rate
command to con gure the speed for DCE connections
CERTIFICATION OBJECTIVE 1105
Basic IOS Security Configuration
The Computer Security Institute (CSI) is an organization that provides education and training on network security fundamentals Periodically it performs market research studies on security issues with companies In one study, more than 70 percent of all the companies polled reported experiencing some kind of security breach Knowing this information, as a network administrator, one of your roles will be to ensure that access to your networking devices is strictly controlled The following sections will introduce you to securing your IOS device NOTE: The information introduced in this chapter is only the beginning of security features you ll set up on your IOS devices; many more of these features are discussed throughout the book, such as port security on the switches in 12, Security Device Manager (SDM) in 18, and access control lists (ACLs) in 22, to name a few
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