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When the Internet first came banging into the public psyche, most users were ultimately connected to the Internet via an Ethernet LAN. LANs use a local device address known as a medium access control (MAC) address, which is 48 bits long and nonhierarchical, which means that it cannot be used in IP networks for routing. To get around this disparity, and to create a technique for relating MAC addresses to IP addresses, the Address Resolution Protocol (ARP) was created. ARP allows a host to determine a receiver s MAC address when it only knows the device s IP address. The process is simple: The host transmits an ARP request packet that contains the MAC broadcast address. The ARP request advertises the destination IP address and asks for the associated MAC address. Since every station on the LAN hears the broadcast, the station that recognizes its own IP address responds with an ARP message that contains its MAC address. As ARP became popular, other address management protocols came into play. Reverse ARP (RARP) gives a diskless workstation (a dumb terminal, for all intents and purposes) the ability to determine its own IP address, knowing only its own MAC address. Inverse ARP (InARP) maps are used in frame-relay installations to map IP addresses to framerelay virtual circuit identifiers. ATMARP and ATMInARP are used in ATM networks to map IP addresses to ATM virtual path/channel identifiers. And finally, LAN Emulation ARP (LEARP) maps a recipient s ATM address to its LAN Emulation (LE) address, which is typically a MAC address.
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There are three routing protocols that are most commonly used in IP networks: the Routing Information Protocol (RIP), the Open Shortest Path First (OSPF), and the Border Gateway Protocol (BGP). OSPF and RIP are used primarily for intradomain routing within a company s dedicated network, for example. They are sometimes referred to as interior gateways protocols. RIP uses hop count as the measure of a particular network path s cost; in RIP, it is limited to 16 hops.
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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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When RIP broadcasts information to other routers about the current state of the network, it broadcasts its entire routing table, resulting in a flood of what may be unnecessary traffic. As the Internet has grown, RIP has become relatively inefficient because it does not scale as well as it should in a large network. As a consequence the OSPF protocol was introduced. OSPF is known as a link state protocol. It converges (spreads important information across the network) faster than RIP, requires less overall bandwidth, and scales well in larger networks. OSPF-based routers only broadcast changes in status rather than the entire routing table. The BGP is referred to as an exterior gateway protocol because it is used for routing traffic between Internet domains. Like RIP, BGP is a distance vector protocol, but unlike other distance vector protocols, BGP stores the actual route to the destination.
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The Not-So-Distant Future: IP Version 6 (IPv6)
Because of the largely unanticipated growth of the Internet since 1993 or so (when the general public became aware of its existence), it was roundly concluded that IP version 4 was inadequate for the emerging and burgeoning needs of Internet applications. In 1995, IP version 6 (IPv6) was introduced, designed to deal with the shortcomings of version 4. Changes included increased IP address space from 32 to 128 bits, improved support for differentiable QoS requirements, and improvements with regard to security, confidentiality, and content integrity. IPv6 continues to be studied, and while it is in use, its pace of adoption is relatively slow. Its arrival is inevitable; however, the question is when.
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