Tài liệu Chapter 11 - Configuring and Testing Your Network ppt

Chapter 11 - Configuring
and Testing Your Network
CCNA Exploration 4.0CCNA Exploration 4.0
Overview
• Define the role of the Internetwork Operating System
(IOS)
• Use Cisco CLI commands to perform basic router
and switch configuration and verification
• Given a network addressing scheme, select, apply,
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and verify appropriate addressing parameters to a
host
• Use common utilities to verify network connectivity
between hosts
• Use common utilities to establish a relative
performance baseline for the network
Role of Internetwork Operating System (IOS)
• Identify several classes of devices that have IOS
embedded
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Role of Internetwork Operating System (IOS)
• Basic routing and switching functions
• Reliable and secure access to networked resources
• Network scalability
• Using Cisco Command Line Interface (CLI) to configuration
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Access Methods
• Access Methods
– Console
– Telnet or SSH

– AUX port
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Access Methods
• Use the CLI to access various IOS configuration
modes on a device
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Console
• Console
– Low speed serial connection to directly connect a
computer or terminal to the console port on the router or
switch.
– Provides out-of-band access to a router
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• Examples of console use are:
– The initial configuration of the network device
– Disaster recovery procedures and troubleshooting
where remote access is not possible
– Password recovery procedures
Telnet and SSH
• Telnet
– Require active networking services on the device.
– Run on layer 7 in OSI model
• Secure Shell (SSH) protocol
– Like telnet but more secure access
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– Like telnet but more secure access
– Stronger password
– Uses encryption when transporting session data
– Use can use ssh client on PC name: Putty
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AUX
• Another way to establish a CLI session remotely is via a
telephone dialup connection using a modem
connected to the router's AUX port
• Can used locally, like console port
• Console port is also preferred over the auxiliary port for
troubleshooting because it displays router startup,
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troubleshooting because it displays router startup,
debugging, and error messages by default.
Role of Internetwork Operating System (IOS)
• Define the purpose of startup config.
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Role of Internetwork Operating System (IOS)
• Identify the relationship between IOS and config
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Configuration files
• Contain the Cisco IOS software commands used to
customize the functionality of a Cisco device.
• Commands are parsed (translated and executed) by the
Cisco IOS software when the system is booted (from the
startup-config file) or when commands are entered in the
CLI while in configuration mode.
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CLI while in configuration mode.
Types of Configuration Files
• The running configuration file
– Used during the current operation of the device
– Changes to the running configuration will immediately
affect the operation of the Cisco device

• The startup configuration file
– Used as the backup configuration and is loaded when
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– Used as the backup configuration and is loaded when
the device is started
– The startup configuration file or startup-config file is
stored in non-volatile RAM (NVRAM)
Role of Internetwork Operating System (IOS)
• Recognize that Cisco IOS is modal and describe the
implications of modes.
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Role of Internetwork Operating System (IOS)
• Define the different modes and identify the mode
prompts in the CLI
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Role of Internetwork Operating System (IOS)
• Identify the basic command structure for IOS
commands
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IOS command Conventions
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Role of Internetwork Operating System (IOS)
• Identify the types of help and feedback available while
using IOS and use these features to get help, take
shortcuts and ascertain success
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The Forms of Help
• The IOS has several forms of help available:

– Context-sensitive help
– Command Syntax Check
– Hot Keys and Shortcuts
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Command Syntax Check
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Command Syntax Check
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Hot Keys and Shortcuts
• Tab - Completes the remainder of the command or
keyword
• Ctrl-R - Redisplays a line
• Ctrl-Z - Exits configuration mode and returns to the EXEC
• Down Arrow - Allows user to scroll forward through former
commands
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commands
• Up Arrow - Allows user to scroll backward through former
commands
• Ctrl-Shift-6 - Allows the user to interrupt an IOS process
such as ping or traceroute
• Ctrl-C - Aborts the current command and exits the
configuration mode