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ccna udemy free.Router> show controller serial 0 HD unit 0, idb = 0X1BA16C, driver structure at 0xlC04E0 buffer size 1524 HD unit 0, V.35 DCE cable, clockrate 64000In this example, the clock rate is configured: 64000bit/s (bits per second).Video 10.10 A multimedia demonstration of setting the clock frequency for a Cisco router's serial interface is included in the companion digital resource to this book OTo determine whether the interface's connection type is DTE or DCE, use the command showcontroller. to configure the speed of a DCE connection, use the command clock rate0 authentication target 10.0510.5I0S Security Basic ConfigurationThe Computer Security Institute (CSI), an organization that provides cybersecurity education and training, regularly conducts market research on company security issues. In one study, over 70% of the companies surveyed admitted to having suffered some kind of security threat. With this in mind, one of the responsibilities of a network administrator is to ensure that access to network devices is strictly limited. The next few subsections provide a brief overview of how to protect IOS devices.Note: This chapter covers only the basic security features that need to be configured on an IOS device. Numerous other security features are discussed later in the book, such as switch port security, which is discussed in Chapter 11, and access control lists (ACLs), which are discussed in Chapter 21010.5.1 Physical and Environmental ThreatsMany network administrators forget that the first line of defense in protecting network devices includes protection against physical and environmental threats, which encompasses the following. . Hardware: take physical measures (such as locked doors, key cards, cameras, etc.) to restrict access to the router. . Power: Ensure that devices are protected from power surges, power restrictions, and power outages. . Environment: ensure that the temperature of the environment in which the device is located is not too high or too low, and that the humidity is not too high. . Maintenance: Ensure that electrostatic discharge protocols are followed when handling sensitive electronic components; have spares of critical components available; and properly label