Chapter 1 introduce to Routing and Packet Forwarding. This chapter identify a router as a computer with an OS and hard ware 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. | Introduction to Routing and Packet Forwarding Routing Protocols and Concepts – Chapter 1 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. Router as a Computer Describe 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 Router as a Computer Data is sent in form of packets between 2 end devices Routers are used to direct packet to its destination Router as a Computer Routers examine a packet’s destination IP address and determine the best path by enlisting the aid | Introduction to Routing and Packet Forwarding Routing Protocols and Concepts – Chapter 1 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. Router as a Computer Describe 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 Router as a Computer Data is sent in form of packets between 2 end devices Routers are used to direct packet to its destination Router as a Computer Routers examine a packet’s destination IP address and determine the best path by enlisting the aid of a routing table 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 router’s 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 Router as a Computer Router components 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 & .
