Chapter 1 Routing Protocols and Concepts

Chapter 1 Routing Protocols and Concepts - 2007 Cisco...

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Unformatted text preview: 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 1 Version 4.0 Introduction to Routing and Packet Forwarding Routing Protocols and Concepts Chapter 1 2 2007 Cisco Systems, Inc. All rights reserved. Cisco Public Objectives Identify a router as a computer with an OS and hardware designed for the routing process. Demonstrate the ability to configure devices and apply addresses. Describe the structure of a routing table. Describe how a router determines a path and switches packets. 3 2007 Cisco Systems, Inc. All rights reserved. Cisco Public Router as a Computer The basic purpose of a router Computers that specialize in sending packets over the data network They are responsible for interconnecting networks by selecting the best path for a packet to travel and forwarding packets to their destination Routers are the network center Routers generally have 2 connections: WAN connection (Connection to ISP) LAN connection 4 2007 Cisco Systems, Inc. All rights reserved. Cisco Public Router as a Computer Data is sent in form of packets between 2 end devices Routers are used to direct packet to its destination 5 2007 Cisco Systems, Inc. All rights reserved. Cisco Public Router as a Computer Routers examine a packets destination IP address and determine the best path by enlisting the aid of a routing table 6 2007 Cisco Systems, Inc. All rights reserved. Cisco Public Router as a Computer Router components and their functions: CPU - Executes operating system instructions Random access memory (RAM) - Contains the running copy of configuration file. Stores routing table. RAM contents lost when power is off. Read-only memory (ROM) - Holds diagnostic software used when router is powered up. Stores the routers bootstrap program. Non-volatile RAM (NVRAM) - Stores startup configuration. This may include IP addresses (Routing protocol, Hostname of router). Flash memory - Contains the operating system (Cisco IOS). Interfaces - There exist multiple physical interfaces that are used to connect network. Examples of interface types: Ethernet / fast Ethernet interfaces Serial interfaces Management interfaces 7 2007 Cisco Systems, Inc. All rights reserved. Cisco Public Router as a Computer Router components 8 2007 Cisco Systems, Inc. All rights reserved. Cisco Public Router as a Computer Major phases to the router boot-up process Test router hardware Power-On Self Test (POST) Execute bootstrap loader Locate & load Cisco IOS software Locate IOS Load IOS Locate & load startup configuration file or enter setup mode Bootstrap program looks for configuration file 9 2007 Cisco Systems, Inc. All rights reserved. Cisco Public Router as a Computer Router boot-up process: The show version command is used to view information about the router during the bootup process. Information includes: Platform model number...
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Chapter 1 Routing Protocols and Concepts - 2007 Cisco...

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