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asynchronous communications, some of which can be considered more art than science We will examine the most common commands and then consider how these commands can be put together in a sample configuration The first command, as always when specifying a link layer protocol, is to define the encapsulation for the chosen interface This is achieved with the following commands: Router1(config)#interface async 1 Router1(config-int)#encapsulation ppp If we are specifying PPP encapsulation, this implies that the asynchronous port will be used for a network connection We therefore should place the port in dedicated mode The mode choice for an async port is either dedicated or interactive Placing the port in interactive mode presents the user with a command prompt and allows the user to manually input user name, passwords, and other connection-related information For security reasons, I prefer to keep the async mode as dedicated, which is achieved with the following command: Router1(config-int)#async mode dedicated Next you will want to enable Van Jacobsen header compression In reality, compressing headers makes comparatively little difference in link bandwidth consumed by the protocol, but with asynchronous communications you should do everything possible to improve throughput Header compression is turned on by default, but it does not hurt to enable it in case it had been previously disabled This is achieved in interface configuration mode: Router1(config-int)#ip tcp header-compression on The next issue is to assign IP addresses to the ports and to computers connecting to those ports You have a choice, either to hard-code IP addresses into computers connecting to the async ports, or have the address assigned to the computer when it connects to the async port If you choose the first option, you must ensure that the IP address assigned to the computer dialing in is in the same subnet as the address range assigned to the async ports themselves My preference is to have the IP address assigned to the computer by the async port upon connection This makes life simpler and does not restrict a computer to being able to dial in to only one location To have the async interface assign an IP address to a computer when it connects, three separate configurations need to take place First the async port must be given an unnumbered address (IP unnumbered is covered more fully in Chap 7) Next, the async port must be configured to deliver a specific IP address to the connecting computer Finally, the connecting computer must have no IP address configured The two entries in the router port configuration, to define IP unnumbered and 193111 as the address assigned to a connecting computer, are as follows: Router1(config)#interface async1 Router1(config-int)#ip unnumbered ethernet 0 Router1(config-int)#async default ip address 193111.

Installing the network is one of the first job responsibilities that you may have as a network professional This duty may include purchasing server hardware, the server NOS, and client desktop systems You will also need to make choices regarding the type of network you wish to install will you choose a Novell, Microsoft, or Linux networking environment Will you go with a peer-to-peer or client/server network Will you have a mixed environment with a few Microsoft servers and a few Linux or Novell servers This section will help you answer these questions

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Looking back to 1, you learned the difference between a peer-to-peer networking environment and a server-based one You will now need to choose which type of network you intend to build If you choose to build a peer-to-peer network, you will not be required to purchase server hardware and the network operating system, thereby reducing cost The disadvantage of a peer-to-peer network is that it is typically limited to ten systems If you choose to go with a server-based network, you will need to purchase the server hardware and the server network operating system, so you can expect some additional cost You will also need to obtain client access licenses A client access license (CAL) is needed to allow the client to connect to the network operating

The WINIPCFG utility includes buttons for releasing and renewing IP addresses for DHCP It also contains information pertaining to the time and date the lease was obtained and when it expires The available options in the winipcfg dialog box are listed as follows:

We will begin our discussion of the PIX by initially answering the question, "just what is the PIX " The PIX is a complete hardware and software solution, similar in this regard to a router The PIX IOS runs only on the special PIX hardware and cannot be ported to other hardware platforms Similarly, the PIX hardware does not support any other operating systems such as Unix or NT Figure 10 1 shows a view of the PIX from the front

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FIGURE 6-17

An additional option included with WINIPCFG is the /Batch switch This enables you to forward the information in this utility to a text file By default, output is placed in the WINIPCFGOUT file in the %WINDIR% directory By appending a path and filename to the end of this switch, you can place this information wherever you prefer The batch option can be used with any command-line option available for this utility

Perform Exercise 6-6 from LabBookpdf on the CD-ROM to experiment with IPCONFIG or watch the CertCam training video

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