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To do this efficiently in practice, it will help you to know how the Cisco user interface works. Think of this as similar to learning DOSKEY in the PC world or the vi editor in the Unix world. It’s important to know at the beginning that you do not have to type in the entire command for the router to know what to do for you. As long as you type enough to identify a unique command, the router will accept it. Here’s an example: Hostname#wri t This is the abbreviation for the command write terminal; the string wri t is enough information for the router to interpret the com- 11 Router Basics mand correctly, and, as we shall see later, this command will cause the router to display its configuration to the screen.

This is referred to as a fully qualified hostname. If one wishes to communicate with a host that is at another Internet site, the fully qualified hostname must be used. Hostnames cannot be used as an address in forming a packet to be sent over a network, so they are converted to IP addresses, which are used in addressing a packet. To translate a hostname to an IP address, a computer typically will refer to a hosts file (normally stored locally in the /etc subdirectory) or a Domain Name Service server on the internetwork, which is, effectively, a centralized hosts file.

Connectionless protocols assume that the application running in the Application layer takes care of these things. The choice of using a connection-oriented or a connectionless protocol is not always as straightforward as it might seem. A connectionoriented protocol may seem attractive because of the guarantees it gives, but often the overhead (particularly in terms of packet acknowledgment) can make certain system implementations impossible. It is generally an application developer issue and will not be discussed further here.

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