qr code c# free 11: Cisco IOS Software in Objective-C

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11: Cisco IOS Software
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terminate the banner, so you can have banners that span multiple lines Whenever you have completed your banner, type the delimiting character to end the command Here is an example of setting up a login banner:
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IOS(config)# banner motd $ This is a private system and only authorized individuals are allowed! All others will be prosecuted to the fullest extent of the law! $ IOS(config)#
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In this example, the banner spans multiple lines and the delimiting character is the dollar sign ($) A banner doesn t have to span multiple lines, but it can be placed on a single line, as in this example:
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IOS(config)# banner motd 'Keep Out!' IOS(config)#
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In this example, the single quote (') is the delimiting character Once you have created a login banner, test it by logging out of the IOS device and logging back in You should see your banner appear before the User EXEC password prompt
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Remember that the banner exec command displays a banner banner motd command displays a banner after you log in, but before you get a User before you are authenticated on a line; the EXEC prompt Besides the MOTD banner, you can create other types of banners The MOTD banner is displayed before the login process occurs An EXEC banner allows you to display a message after authentication occurs and before the User EXEC prompt is displayed To create an EXEC banner, replace the motd parameter in the banner motd command with exec You should not use such words as welcome or any type of welcoming salutation in your banner; using such words can be misconstrued and allow real attackers to defend their actions by the welcoming salutation in your login banner
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IOS Operation and Veri cation
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1112 The CD includes a multimedia demonstration of setting up a login banner on a Cisco router
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CERTIFICATION OBJECTIVE 1106
IOS Operation and Verification
Once you have configured your IOS device, many commands are available to use to examine and troubleshoot your configuration This section covers some of the basic show commands available Subsequent chapters will discuss additional commands you can use to help troubleshoot more complex problems
Show and Debug Command Overview
You can use two basic commands to troubleshoot problems on an IOS device:
show
Takes a snapshot of a particular process and displays information about it; the information displayed is static and will not refresh itself unless you re-execute the command (you can use your command-line history feature to do this) Displays how a particular process is currently operating, showing information as it basically happens, in real-time
debug
The show commands require little processing on the IOS device to perform and allow you to get a quick idea as to how something is configured (the configuration in RAM, a routing protocol, or STP) or the current state of a process (such as an interface, a routing table, or a port address table) Unfortunately, show commands sometimes don t provide enough information, in certain instances, to diagnose a problem and fix it correctly The debug commands, on the other hand, display how a process is currently running or behaving, such as the contents of a routing update received by a neighboring router, and are therefore typically more useful in troubleshooting difficult problems The main disadvantage of debug commands is that they are process-intensive on the IOS device and should be used with care
11: Cisco IOS Software
Running and Startup Con guration
A configuration file contains the commands used by an IOS device By default, two configurations are possible on an IOS device:
running-config startup-config
This file contains the actual configuration running in RAM of the IOS device (the one it is currently using) This file contains the backed-up configuration in NVRAM or flash of an IOS device
Configuration files can reside in many locations, including RAM, nonvolatile RAM (NVRAM), or a TFTP server, among other places Whenever you make changes to an IOS s configuration by typing in commands from Configuration mode, these changes are made in RAM These changes can then be saved to NVRAM, which is a static form of memory in which, when the Cisco device is turned off, the contents are not erased and are available upon a power-up IOS devices do not automatically back up the configuration file from RAM to NVRAM; this must be done manually Configuration changes can also be saved to an external server using Trivial File Transfer Protocol (TFTP), File Transfer Protocol (FTP), and Secure Copy Protocol (SCP) this, however, requires that you configure IP addressing and possibly a default gateway address on your IOS device (These topics are discussed in s 12, 16, and 17) The following sections discuss how you view your IOS device s configuration files as well as how to back up and restore your configuration files locally on your IOS device
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