Objectives. Access methods for CLI environment. Configuration files

Transcription

1 2007 Cisco Systems, Inc. All rights reserved. Cisco Public Configuring and Testing Your Network Network Fundamentals Chapter 11 ITE PC v4.0 Chapter 1 1 Objectives 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, 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 2 Cisco Internetwork Operating System (IOS) The Cisco IOS is used for most Cisco devices Provides devices with the following network services: Basic routing and switching functions Secure access to networked resources Network scalability Uses a command line interface (CLI). Flash memory provides non-volatile storage. Stores the IOS. Access methods for CLI environment Console port Telnet or Secure Shell (SSH) AUX port (for modem rarely used) The device should be located in a locked room or equipment rack to prevent physical access. For security reasons, the IOS requires that the Telnet session use a password, as a minimum authentication method. IOS is copied into RAM on bootup. 3 4 Configuration files Configuration files contain the Cisco IOS software commands used to customize the functionality of a Cisco device. The running configuration file used during the current operation of the device The startup configuration file used as the backup configuration and is loaded when the device is started. Stored in NVRAM Changes to the running configuration will immediately affect the operation of the Cisco device. 5 6

2 Configuration Files: startup-configuration, running-configuration Cisco IOS is modal - the main modes are: 7 8 Configuration modes and associated prompt IOS Mode Hierarchical Structure 9 10 Basic command structure for IOS commands Help and feedback available while using IOS After entering each complete command, including any keywords and arguments, press the <Enter> key to submit the command to the command interpreter

3 show command Configuring device names Passwords limit access to device configurations Console password Passwords are optional should always be set. Console password - limits device access using the console connection Enable password - limits access to the privileged EXEC mode Enable secret password - encrypted, limits access to the privileged EXEC mode VTY password - limits device access using Telnet Passwords cisco and class used in the labs Telnet and enable passwords Configuring a login banner Banners are an important part of the legal process to prosecute for breaking into a device

4 Examining and saving the running-config Backup and restore a configuration using tftp server Backup and restore a configuration using a text file Use Cisco CLI Commands to Perform Basic Router & Switch Configuration and Verification Configuring router Ethernet interfaces Assigning interface descriptions to a router 23 24

5 Select, Apply, and Verify Appropriate Addressing Parameters to a Host Using ipconfig/ifconfig to verify host parameter assignments Use the ping command to test local gateway connectivity Testing the local NIC IP assignment Use the ping command to determine if a host can actively communicate across the local network Testing the path to a remote host 29 30

6 Interpreting test results Use Common Utilities to Establish a Relative Performance Baseline for the Network Use the output of the ping command, saved into logs, and repeated over time, to establish relative network performance Use Common Utilities to Establish a Relative Performance Baseline for the Network Use the output of the traceroute command, saved into logs, and repeated over time, to establish relative network performance Summary Define the role of the Internetwork Operating System (IOS) Define the purpose of a configuration file Identify several classes of devices that have the IOS embedded Identify the factors contributing to the set of IOS commands available to a device Identify the IOS modes of operation Identify the basic IOS commands Compare and contrast the basic show commands Lab Given: /24 Calculate subnets Configure router Configure switch Save configurations to a text file 35