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Introduction to Cisco Device Configuration
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Out-of-band management occurs through the console or auxiliary ports;
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in-band occurs through an interface
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Console port connections require an RJ-45 rollover cable and, possibly, an
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RJ-45 to DB-9 terminal adapter In your terminal emulation package, set the following: speed to 9600 bps, data bits to 8, stop bits to 1, parity to none, and flow control to none
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Interfaces have a name, possibly a slot number, and a port number The slot
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number of the 2960 is 0; port numbers start at 1 Router slot numbers begin with 0; port numbers start at 0 and restart with each type within each slot
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Four CLI access modes exist: User EXEC (IOS>), Privilege EXEC (IOS#),
Configuration (IOS(config)#), and ROMMON mode (>)
The enable command moves you from User EXEC to Privilege EXEC
mode The exit command logs you out of the IOS device
IOS Basics
Use the to display context-sensitive help in any mode of a router; it lists
available commands and their valid parameters
If you execute a command and see the resulting output of the command,
examine the output to ensure that no error is present in the command you entered
You can use the arrow keys on your keyboard to recall and edit commands Use the TAB key to autocomplete a command
Basic IOS Configuration
Use the Privilege EXEC configure terminal command to enter
Configuration mode
The hostname command assigns a locally significant name to the router
The no parameter negates/undoes a configuration change
11: Cisco IOS Software
The no shutdown command enables an interface; interfaces on switches
are enabled by default, but router interfaces are disabled The clock rate command specifies the speed of a DCE serial interface on a router and is required when connecting two serial interfaces, back-to-back, without using external clocking devices such as CSU/DSUs Use the show controller command to verify whether or not the serial interface is a DTE or DCE
Basic IOS Security Configuration
Lines (access to User EXEC mode) can be secured with the password
command Access to Privilege EXEC mode can be secured with either the enable password or enable secret command; the former is unencrypted and the latter is strongly encrypted
Clear-text passwords can be encrypted with the service password-
encryption command
You can display a login banner before a username/password prompt with the
banner motd command; after the authentication takes place and before the user sees an EXEC prompt, you can display a banner with the banner exec command
IOS Operation and Verification
You must be at Privilege EXEC mode to manipulate configuration files The
show running-config command displays the running configuration in RAM The show startup-config command displays the backed-up configuration in NVRAM
IOS devices do not automatically save their configurations from RAM
to NVRAM; use the copy running-config startup-config command to do this
Use the show version command to see the IOS version of the device as
well as its hardware characteristics
The show interfaces command is used to see the operational status of
the physical and data link layers of an IOS device s interface
Self Test
SELF TEST
The following Self Test questions will help you measure your understanding of the material presented in this chapter Read all the choices carefully, as there may be more than one correct answer Choose all correct answers for each question
Introduction to Cisco Device Configuration
1 A __________ cable is used to connect to the console port of your IOS device
Command-Line Interface (CLI)
2 Match the device modes with commands or processes associated with that mode Device modes: User EXEC, Privilege EXEC, Configuration, and ROMMON Commands or processes: show running-config, enable, password recovery, line vty 0 4
IOS Basics
3 Which of the following allows you to use context-sensitive help (choose two) A B C D A B C D help show verify
CTRL-E CTRL-A ESC-B CTRL-B
4 Which control sequence takes you to the beginning of the CLI
Basic IOS Configuration
5 Enter the IOS command that will change the device name to Perimeter : __________ 6 Match the following commands to their description Commands: shutdown, show controller, login local, and clock rate Descriptions: Shows if an interface is DTE/DCE; specifies the use of an IOS database for authentication; specifies the speed of a serial interface; disables an interface
11: Cisco IOS Software
7 You execute the line console 0 command from Configuration mode What will the router s prompt be A B C D Router(config)# Router(config-line)# Router(config-interface)# Router#(config-if)
Basic IOS Security Configuration
8 Enter the IOS command that will encrypt unencrypted passwords: __________ 9 Which IOS command would display a message of This is Router5 after a user logs in A B C D banner motd login exec banner exec login motd
IOS Operation and Verification
10 You examine your interfaces, and the Ethernet 0 interface status says Ethernet 0 is up, line protocol is down What does this indicate A B C D A B C D A physical layer problem A data link layer problem A network layer problem There is no problem copy copy copy copy nvram startup-config startup-config running-config running-config nvram running-config startup-config
11 What IOS command saves the active configuration to NVRAM
Self Test Answers
SELF TEST ANSWERS
1 A rollover cable is used to provide your initial access to an IOS device via the console port/line 2 User EXEC: enable; Privilege EXEC: show running-config; Configuration: line vty 0 4; and ROMMON: password recovery 3 A and C The and help commands allow you to use the context-sensitive help feature B is incorrect because the show command displays how a feature is configured or operating D is incorrect because verify is an invalid command 4 B Pressing CTRL-A takes you to the beginning of the CLI A is incorrect; pressing CTRL-E takes you to the end of the CLI C, ESC-B, moves the cursor back one word at a time D, CTRL-B, moves the cursor back one character at a time 5 The hostname Perimeter command will change the device name to Perimeter 6 The show controller command shows whether an interface is DTE/DCE; shutdown disables an interface; login local specifies the use of an IOS database for authentication; clock rate specifies the speed of a serial interface 7 B When you execute the line console 0 command, your prompt changes to Router(config-line)# A is incorrect because this is Global Configuration mode D represents Interface Subconfiguration mode, and C is a nonexistent prompt 8 The service password-encryption command will encrypt unencrypted passwords 9 C The banner exec command displays a banner after the user authenticates, but before the EXEC prompt is displayed A, banner motd, displays a banner before the username and password prompt B and D are invalid commands 10 B The line protocol is down refers to a problem in the data link layer A is incorrect because the physical layer is up C is incorrect because the status refers only to the physical and data link layers Since there is a correct answer, D is incorrect 11 D Use the copy running-config startup-config command to back up your configuration from RAM to NVRAM B is incorrect because copy startup-config running-config restores your configuration to RAM A and C are incorrect because these commands use nonexistent parameters
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