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The "Hello Fred" message, along with other Application data, will be delivered to the layer 6 protocol as a PSDU The layer 6 protocol adds its header information and passes an SSDU down to the layer 5 protocol The layer 5 protocol cannot interpret the layer 6 header or anything else in the SSDU, and treats all of the SSDU as user data To pass a TSDU to the layer 4 protocol (the Transport layer), the layer 5 protocol adds a layer 5 header in front of the SSDU, and this process continues until a PhSDU is given to the Physical layer, where binary 1s and 0s are converted into electrical signals for transmission over the network media At the receiving machine, the electrical signals are translated into 1s and 0s by the Physical layer, and the layer 2 (Data Link) protocol interprets these 1s and 0s as frames, removes the layer 2 header generated by the sending machine's layer 2 protocol, and passes an LSDU up to its Network layer Again, this process of each layer removing its own header and passing the information upwards continues until "Hello Fred" and the other Application data are delivered to the receiving machine's Application layer The ISO designed protocols for all layers in this model These protocols, however, have not become as widely quoted or used as the model that defines their operation The main reason for this is that the TCP/IP protocol suite was already defined, in widespread use, and proven to work well in many environments Next we look at how the Department of Defense in the United States defined a model for computer communications and implemented this model with the TCP/IP protocol suite

The T-carrier and E-carrier are both dedicated digital lines used to transmit voice, data, or images The T-carrier is used in the United States, Japan, and Australia, whereas the E-carrier is used in Europe, Mexico, and South America There are different categories of each carrier that indicate the speed of the line T1 is composed of twenty-four channels that are made up of 64 Kbps bandwidth each, for a total of 1544 Mbps Each 64 Kbps channel is referred to as digital signal level 0 (DS0), with the twenty-four DS0 channels making a digital signal level 1 (DS1) These lines can be multiplexed into faster links, as shown in Table 9-3 Most companies cannot afford a T-carrier line, so it is best for some companies to look into other means of connecting to the Internet or creating a WAN If necessary, a company can lease a partial T1 line, which is called a Fractional T1, at a lower price A Fractional T1 will also provide only a fraction of the bandwidth

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0 1 2 3 24

tabLe 9-3

The E1-carrier is similar to the T-carrier, but differs in bandwidth An E1-carrier is composed of thirty 64 Kbps data channels with two 64 Kbps channels for signaling The E1-carrier has a total bandwidth of 2048 Mbps The E3-carrier is composed of sixteen T1-carrier channels for a total bandwidth of 34368 Mbps The Ex-carriers are listed in Table 9-4 with their total bandwidth

The Department of Defense (DoD) has defined a four-layer networking model Each layer of this model consists of a number of protocols that are collectively referred to as the TCP/IP protocol suite

The Channel Service Unit/Data Service Unit (CSU/DSU) is a device that allows a business to connect a high-speed data link from the telephone company to the business s router for access to and from the LAN or WAN The high-speed connections are usually T1 or T3 connections or their European counterparts, E1 and E3 The CSU/DSU used will be specific to the speed of the line being connected to from the telephone company

Hundreds of different SAP types exist A complete list can be found at ftp://ftpisiedu/in-notes/iana/assignments/novell-sap-numbers The server-namefield is the name of a particular server An asterisk (*) can be used as a wild-card character Returning to Figure 9 1, suppose we wish to prevent the router from advertising the existence of the accounting server to the devices on segment BA We can do this task with the following configuration: interface ethernet 1 ipx network BA ipx output-sap-filter 1000 ! access-list 1000 deny -1 0 account* access-list 1000 permit -1

tabLe 9-4

9:

Requests for Comments (RFC) The RFCs are submitted by various Internet users who are proposing new protocols, suggesting improvements of existing protocols, or even offering comments on the state of the network These documents are online on various systems on the Internet, and are available to anyone Table 22 shows the DoD's four-layer model You can see that the layers of the DoD model do not precisely match those of the OSI model For example, in DoD terms IP is a layer 2 protocol, whereas in OSI terms it is a layer 3 protocol Throughout the rest of this book, when a protocol function is referred to as belonging to a particular layer, it is the OSI layer definition that is used Table 22 : The DoD Data Communications Model

The CSU is the user end of the high-speed connection that will perform encoding and line conditioning as well as protect the LAN or WAN from electrical interference such as lightning It can also provide statistics for line use There is also the capability of a loopback test to assure that the high-speed data connection is still intact The DSU portion is on the side of the telephone company and supports timing functions as well as data conversion

There are a number of technologies that are used to connect to the Internet, including some of the high-speed Internet technologies that are used by small businesses or home users These technologies include ADSL and Cable Modem Internet connections

These commands will filter all services that begin with the string "account" We could have specified the entire string, but if the name of the server changed to accounting_1, we would have

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