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Some addresses are reserved for specific purposes. A HOST_ID of 0 is reserved to identify an entire subnetwork. For example, the address 168.152.20.0 refers to a Class C address with a NET_ID of 168.152.20. A HOST_ID that consists of all ones (usually written 255 when referring to an all-ones byte, but also denoted as -1 ) is reserved as a broadcast address and is used to transmit a message to all hosts on a particular network.
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One of the most valuable but least understood tools in IP protocol management is called the subnet mask. Subnet masks are used to identify the portion of the address that specifies the network or the subnetwork for routing purposes. They also may be used to divide a large address into subnetworks or to combine multiple, smaller addresses to create a single large domain. In the case of an organization subdividing its network, the address space is apportioned to identify multiple logical networks. This is accomplished by further dividing the HOST_ID subfield into a Subnetwork Identifier (SUBNET_ID) and a HOST_ID.
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Adding to the Alphabet Soup: CIDR, DHCP, NAT, and PAT
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As soon as the Internet became popular in the early 90s, concerns began to arise about the eventual exhaustion of available IP addresses. For example, consider what happens when a small corporation of 11 employees purchases a Class C address. They now control more than 250 addresses, of which they may only be using 25. Clearly, this is a waste of a scarce resource. One technique that has been accepted for address space conservation is called Classless Interdomain Routing (CIDR). CIDR effectively limits the number of addresses assigned to a given organization, making the process of address assignment far more granular and therefore efficient. Furthermore, CIDR has had a secondary, yet equally important, impact: It has dramatically reduced the size of the Internet routing tables because of the preallocation techniques used for address space management.
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Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.
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Other important protocols include Network Address Translation (NAT), which translates a private IP address that is being used to access the Web into a public IP address from an available pool of addresses, thus further conserving address space; Port Address Translation (PAT) and Network Address Port Translation (NAPT), which allow multiple systems to share a single IP address by using different port numbers. Port numbers are used by transport layer protocols to identify specific higher layer applications.
Addressing in IP: The Domain Name System (DNS)
IP addresses are 32-bits long, and while not all that complicated, most Internet users don t bother to memorize the dotted decimal addresses of their systems. Instead, they use natural language host names. Most hosts, then, must maintain a comparative table of both numeric IP addresses and natural language names. From a host perspective, however, the names are worthless; they must use the numeric identifiers for routing purposes. Because the Internet continues to grow at a rapid clip, a system was needed to manage the growing list of new Internet domains. That system is the DNS. It is a distributed database that stores host names and IP address information for all of the recognized domains found on the Internet. For every domain there is an authoritative name server that contains all DNS-related information about that domain, and every domain has at least one secondary name server that also contains the information. A total of thirteen root servers, in turn, maintain a list of all of the authoritative name servers. How does the DNS actually work When a system needs another system s IP address based upon its host name, the inquiring system issues a DNS request to a local name server. Depending on the contents of its local database, the local name server may be able to respond to the request. If not, it forwards the request to a root server. The root server, in turn, consults its own database and determines the most likely name server for the request and forwards it appropriately.
Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.
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