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As previously illustrated, when connecting two systems using TCP/IP, each protocol layer on one host communicates directly with the corresponding layer on the other host For example, the DoD Network Access layer on one host communicates directly with the Network Access layer on another host Each layer will use its own addressing scheme: The Application layer uses a hostname The Transport layer uses a port number The Internet layer uses an IP address The Network Access layer uses a MAC address Now that all the terms we need to use have been introduced, we start to look at how things really work in an internetwork The goal of the seven OSI layers of communication protocols is to form a packet that is correctly encoded for the network topology in use (such as Ethernet or Token-Ring), and to direct the packet to the correct destination or at least to the next router in sequence to reach the desired destination Figure 2-5 shows how the various addresses have to be assembled before a packet can be transferred on a network
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Figure 2-5: Addresses used in a packet to deliver application data across a network
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We will now examine in more detail the addressing used at each layer of the DoD model, and conclude the chapter with a summary that illustrates how all the addresses work together to deliver a packet
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The Application layer is the interface to the user At this layer, computers are addressed by hostnames, as it is easier for humans to refer to computers by name rather than by IP address For example, you could call the VAX system in the sales department Sales-VAX, or use any other name that is convenient In the case of the Internet, which contains thousands of systems, two different computers could well have the same name assigned by a local administrator For example, two different companies might both choose to name the VAX system in their sales departments Sales-VAX To avoid confusion, the Internet has a number of domains Each domain has sub domains that can have further divisions as necessary The Internet includes the following domains and usages:
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MILUsed by the Department of Defense EDUUsed by colleges and universities COMUsed by corporations and other commercial entities NETUsed by those managing the Internet The domain name for a host consists of a set of subdomains separated by periods For example, the computer Sales-VAX located at the Acme company might have a Sales-VAXacmecom domain name 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 The hosts file contains three columns: hostname, IP address, and alias (There can be multiple aliases) Here's an example: 123454545Host1Host1acmecom 345121212 Host2Host2acmecom 1732364 Host3Host3acmecom 127001 localhost Manually keeping all hosts files on all machines on an internetwork the same can become quite a headache DNS enables you to point hosts to a DNS server on the network, which will resolve hostnames to IP addresses for many hosts This reduces administration, as you only have to maintain one database, not multiple hosts files
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The Transport layer addresses are quite simple: They consist of a destination and source port number A portion of an /etc/services file from a Unix machine that lists certain well-known port numbers is shown below: ftp 21/tcp
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