Transcript Lab 4
Sybex CCNA 640-802 Chapter 4: Cisco’s IOS and SDM Instructor & Todd Lammle Chapter 4 Objectives • The Cisco router IOS • Enhanced editing • Administrative functions – – – – Hostnames Banners Passwords Interface descriptions • Verifying your configuration 2 Cisco Router IOS • Carries network protocols and functions • Connects high-speed traffic between devices • Adds security to control access • Provides scalability for growth • Supplies reliability Connecting To A Cisco Router Cisco 2811 Cisco 1841 Bringing up a Router – There are four major phases to the bootup process: – 1. Performing the POST – 2. Loading the bootstrap program – 3. Locating and loading the Cisco IOS software – 4. Locating and loading the startup configuration file or entering setup mode Bringing up a Router 1. Performing the POST • Power-On Self Test (POST) • When the router is powered on, software on the ROM chip conducts the POST. • During this self-test, the router executes diagnostics from ROM on several hardware components including the CPU, RAM, and NVRAM. • After the POST has been completed, the router executes the bootstrap program. Bringing up a Router 2. Loading the Bootstrap Program • After the POST, the bootstrap program is copied from ROM into RAM. • Once in RAM, the CPU executes the instructions in the bootstrap program. • The main task of the bootstrap program is to locate the Cisco IOS and load it into RAM. Bringing up a Router 3. Locating and Loading Cisco IOS • The IOS is typically stored in flash memory. • Note: Once the IOS begins to load, you may see a string of pounds signs (#) while the image decompresses. • ############################ Bringing up a Router • 4. Locating and Loading the Configuration File • Bootstrap program searches for the startup configuration file, known as startup-config, in NVRAM. • file is copied into RAM as the running configuration file, running-config. • If the startup configuration file can not be located, then we enter setup mode. Memory • ROM : bootstrap • Flash Memory : Cisco IOS • NVRAM : permanent storage for the startup configuration file (startup-config) • If we made changes then we must save it to the NVRAM Remember • every interface on the router is a member or host on a different IP network. • Each interface must be configured with an IP address and subnet mask of a different network. Command-Line Interface (CLI) • More flexible than setup mode. • To use the CLI, just say No to entering the initial configuration dialog. Modes • User mode: – Router> – Used mostly to view statistics • Privileged mode: – enable – Router# – Used to view & change router configuration • Global configuration mode. • config terminal or – Router (config)# config t Configuration • certain basic tasks are performed including: • • • • • • Naming the router Setting passwords Configuring interfaces Configuring a banner Saving changes on a router Verifying basic configuration and router operations Configuration • Naming the router • Setting passwords • Privileged mode • Console , Telnet Configuration • Banner • Saving changes Configuration • Interface configuration • Try network address, incorrect mask ? Showing the work • Lets try it out !