Chapter 11 Configuring and Testing your Network

In this chapter it discusses here the introduction in router configuration using CLI and it requires the use of Internetwork Operating System (IOS). It says that router is also a computer that has a flash memory. The Cisco Internetwork Operating System (IOS) is the system software in Cisco devices. It is the core technology that extends across most of the Cisco product line. The Cisco IOS provides devices with the following network services: Basic routing and switching functions, Reliable and secure access to networked resources, Network scalability. There are several ways to access the CLI environment. The most usual methods are: Console, Telnet or SSH, AUX port. The Cisco IOS is designed as a modal operating system. The CLI uses a hierarchical structure for the modes. In order from top to bottom, the major modes are: User executive mode, Privileged executive mode, Global configuration mode, other specific configuration modes. There are two primary modes of operation the User EXEC, Privileged EXEC. The role of IOS is that it is the OS of the router and IOS is the one who manage the router configuration. The IOS has several forms of help available: Context-sensitive help, Command Syntax Check, Hot Keys and Shortcuts.