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Newname(config)#boot system flash Newname(config)#boot system rom Press <Ctrl-Z> to exit configuration mode This will enter the above commands in the sequence shown in the configuration file The new configuration can be viewed with the writeterminal command Another global command you will most likely want to enter is shown as follows: Newname(config)#no ip domain-lookup This command is useful, particularly if, like me, you are not the world's greatest typist If you make a spelling mistake when trying to enter a command (when you are in View rather than Configuration mode), the router does not recognize the command It will assume that this strange word is the name of a host on the network and that you wish to establish a Telnet session with it The router will not find the strange hostname in its own host table and will try to find a Domain Name Server on the network in the hope that the DNS machine will know the IP address of the strange host Either you do not have an available DNS machine or, if one is available, it will not have details of this strangely named host The router, therefore, fails to establish a Telnet session This takes some time To stop an unnecessary search, enter the noIPdomain-lookup command in Configuration mode It just makes life easier Major Commands and Subcommands The thing that differentiates a global command from a major command on a router configuration file is that the global command is on one line A major command is followed by, at the least, a one-line subcommand that relates to the major command The major commands in the initial configuration file are listed next, with the associated subcommands indented: line vty 0 4 password access interface Ethernet0 ip address 123454545 255000 interface Serial0 ip address 122222222 255000 interface Serial1 shutdown no ip address To experiment with configuring major commands, and their associated subcommands, we will look at configuring the following: Give the Ethernet port an IP address of 192111, with a subnet mask of 255255255192.

q The most important step of network troubleshooting is isolating the problem q Often there is more than one way to correct a problem, each with its own set

your problems For instance, TechNet is a searchable database of all Microsoft articles and documentation on nearly all its products

The Destination Connection ID field is also a 16-bit field The value in this field is assigned by SPX at the packet's destination and is used to de-multiplex incoming packets from different connections that arrive using the same socket value This field is necessary, because any connections active at the same time on a host can use the same socket Thus, the ID serves to differentiate one connection from another although two or more connections could use the same socket number Table 5 3: Datastream Type field values

service such as DNS or WINS, it is imperative that you begin by verifying that the configuration is correct

q Make sure that you know the definition of WINS, DNS, the hosts file,

Configure Serial 0 to have an unnumbered IP address Configure Serial 1 with an IP address of 193111 and a subnet mask of 2552552550 Configure Serial 1 to have a secondary IP address of 194111, with a netmask of 2552552550 At the Enable prompt, type the following: Newname#conf t Newname(configure)#int eo Newname(config-if)#ip address 192111 255255255192 Newname (config-if)#<Ctrl-Z> This completes the configuration for the Ethernet 0 port Note that the prompt changes when you have entered a major command and are about to enter subcommands The IP unnumbered feature, which we are about to configure for the Serial 0 interface, is discussed in more detail in Chap 7; however, a basic introduction is useful here IP unnumbered is used on point-to-point links to reduce the number of subnets that need to be allocated on an internetwork This is illustrated in Fig 3-2

and the LMHOSTS file You won t be expected to know any in-depth information about each, just the purpose of each For more information, review 4

The Sequence Number field is another 16-bit field This field contains a count of the number of packets exchanged in one direction on a connection with each node keeping its own count The

then travels until it is reflected back, and the distance traveled is calculated This process is similar to the way sonar works

13:

Assuming that IGRP is the routing protocol used on this network, subnet mask information is not transmitted in routing updates; therefore all interfaces that have IP addresses assigned to them must use the same netmask in order for the routing tables to be updated properly Let's say that at both site 1 and site 2 we want to apply a netmask that will allow 62 usable IP addresses in the subnet (remember the first and last address in a subnet cannot be assigned to a host or router

The following Self Test questions will help you measure your understanding of the material presented in this chapter Read all the choices carefully because there might be more than one correct answer Choose all correct answers for each question