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An essential reference for every network professionalLearn a wide variety of internetworking basics, including LAN protocols, WAN technologies, bridging and switching, routing, and network managementDiscover how specific networking technologies fit into the networkExplore the latest information from Cisco on storage, security, scalability, speed, and optical networksGet in-depth information on internetworking technologies with entire parts devoted to LAN protocols, WAN technologies, multiservice access technologies, bridging and switching, network protocols, routing protocols, Internet access technologies, and network management"Internetworking Technologies Handbook," Fourth Edition is a comprehensive reference that helps networking professionals understand and implement contemporary internetworking technologies. Master terms, concepts, technologies, and devices used in today's networking industry, and learn how to incorporate internetworking technologies into a LAN/WAN environment with this definitive reference. This edition features brand-new chapters on storage networking, VoIP, DPT/SRT, EAP, Cisco IOS(R), and optical networking, as well as updated content on a number of important topics.After reading this book, you will possess a greater understanding of local- and wide-area networking and the hardware, protocols, and services that drive networks. "Internetworking Technologies Handbook," Fourth Edition, includes fundamental technology information and progresses to more detailed descriptions and discussions of internetworking and telecommunications technologies and concepts. "Internetworking Technologies Handbook, Fourth Edition," provides system optimization techniques that will strengthen results, increase productivity, and improve efficiency. It is comprehensive in scope, including information about mature technologies as well as emerging technologies. The fourth edition of this best-selling title represents a collaborative effort by numerous networking and documentation experts. With more than 125,000 copies in print, "Internetworking Technologies Handbook" remains an essential reference for every network professional.This book is part of the Networking Technology Series from Cisco Press, which offers networking professionals valuable information for constructing efficient networks, understanding new technologies, and building successful careers.

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This article provides guidance for understanding internetworking technology. Different components of internetwork and the protocols used are described. Click here to return to the

Cisco IOS documentation on www.cisco.com.

Contents

1 Creating a PDF of the Internetworking Technology

Handbook

•

2 Internetworking Basics•

3 LAN Technologies•

4 WAN Technologies•

5 Internet Protocols•

6 Bridging and Switching•

7 Routing•

8 Network Management•

9 Voice/Data Integration Technologies•

10 Wireless Technologies•

11 Cable Access Technologies•

12 Dial-up Technology•

13 Security Technologies•

14 Quality of Service Networking•

15 Network Caching Technologies•

16 IBM Network Management•

17 Multiservice Access Technologies•

Creating a PDF of the Internetworking Technology Handbook

Create a PDF of the Internetworking Technology Handbook that you can save on your computer and print.

Internetworking Basics

An internetwork is a collection of individual networks, connected by intermediate networking devices, that functions as a single large network. Internetworking refers to the industry,

products, and procedures that meet the challenge of creating and administering internetworks.

Internetworking Technology Handbook

Contents 1

Internet Protocols

The Internet protocols are the world's most popular open-system (nonproprietary) protocol suite because they can be used to communicate across any set of interconnected networks

and are equally well suited for LAN and WAN communications. The Internet protocols consist of a suite of communication protocols, of which the two best known are the

Transmission Control Protocol (TCP) and the Internet Protocol (IP). The Internet protocol suite not only includes lower-layer protocols (such as TCP and IP), but it also specifies

common applications such as electronic mail, terminal emulation, and file transfer. This article provides a broad introduction to specifications that comprise the Internet protocols.

Discussions include IP addressing and key upper-layer protocols used in the Internet. Specific routing protocols are addressed individually later in this document.

The following articles provide information about different IOS IP technologies:

Internet Protocols

AppleTalk♦

Banyan VINES♦

IBM Systems Network Architecture Protocols♦

DECnet♦

Simple Multicast Routing Protocol♦

•

Internet Protocol Multicast•

IPv6•

Bridging and Switching

Bridges and switches are data communication devices that operate principally at Layer 2 of the OSI reference model. As such, they are widely referred to as data link layer devices.

Several kinds of bridging have proven important as internetworking devices. Transparent bridging is found primarily in Ethernet environments, while source-route bridging occurs

primarily in Token Ring environments. Translational bridging provides translation between the formats and transit principles of different media types (usually Ethernet and Token

Ring). Finally, source-route transparent bridging combines the algorithms of transparent bridging and source-route bridging to enable communication in mixed Ethernet/Token Ring

environments. Today, switching technology has emerged as the evolutionary heir to bridging-based internetworking solutions. Switching implementations now dominate applications

in which bridging technologies were implemented in prior network designs. Superior throughput performance, higher port density, lower per-port cost, and greater flexibility have

contributed to the emergence of switches as replacement technology for bridges and as complements to routing technology.

The following articles provide information about the technologies employed in devices loosely referred to as bridges and switches:

Transparent Bridging•

Mixed-Media Bridging•

Source-Route Bridging•

Asynchronous Transfer Mode Switching•

LAN Switching and VLANs•

MPLS/Tag Switching•

Internetworking Technology Handbook

Internet Protocols 3

Voice/Data Integration Technologies

Voice/data integration is important to network designers of both service providers and enterprise. Service providers are attracted by the lower-cost model-the cost of packet voice is

currently estimated to be only 20 to 50 percent of the cost of a traditional circuit-based voice network. Likewise, enterprise network designers are interested in direct cost savings

associated with toll-bypass and tandem switching. Both are also interested in so-called "soft savings" associated with reduced maintenance costs and more efficient network control

and management. Finally, packet-based voice systems offer access to newly enhanced services such as Unified Messaging and application control. These, in turn, promise to increase

the productivity of users and differentiate services.

Integration of voice and data technologies has accelerated rapidly in recent years because of both supply- and demand-side interactions. On the demand side, customers are leveraging

investment in network infrastructure to take advantage of integrated applications such as voice applications. On the supply side, vendors have been able to take advantage of

breakthroughs in many areas, including standards, technology, and network performance.

The following article provides information about Voice/Data Integration Technologies:

Voice/Data Integration Technologies•

Wireless Technologies

Wireless communication is the transfer of information over a distance without the use of electrical conductors or "wires".[1] The distances involved may be short (a few meters as in

television remote control) or long (thousands or millions of kilometers for radio communications). When the context is clear, the term is often shortened to "wireless". Wireless

communication is generally considered to be a branch of telecommunications.

It encompasses various types of fixed, mobile, and portable two way radios, cellular telephones, personal digital assistants (PDAs), and wireless networking. Other examples of

wireless technology include GPS units, garage door openers and or garage doors, wireless computer mice, keyboards and headsets, satellite television and cordless telephones.

The following article provides information about Wireless Technologies:

Wireless Technologies•

Cable Access Technologies

Historically, CATV has been a unidirectional medium designed to carry broadcast analog video channels to the maximum number of customers at the lowest possible cost. CATV was

introduced in the 1940s and 1950s and for many decades little changed beyond increasing the number of channels supported. The technology to provide high-margin, two-way

services remained elusive to the operator.

The 2000s and the rise of IPTV saw this delivery model change. Today CATV providers utilize IP protocols for two-way data traffic while simultaneously delivering interactive video

programing.

Internetworking Technology Handbook

Voice/Data Integration Technologies 5

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