ch06_CE - Guide to Networking Essentials Fifth Edition...

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Guide to Networking Essentials Fifth Edition Chapter 6 Network Communications and Protocols
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Guide to Networking Essentials, Fifth Edition2 Objectives Explain the function of protocols in a network Describe common protocol suites
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Guide to Networking Essentials, Fifth Edition3 Protocols Strictly speaking, protocols are the rules and procedures for communicating For two computers to communicate, they must speak the same language and agree on the rules of communication
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Guide to Networking Essentials, Fifth Edition4 The Function of Protocols As protocols serve their functions in the OSI model, they might work at one or many layers When a set of protocols works cooperatively, it’s called a protocol stack or protocol suite The most common protocol stack is TCP/IP , the Internet protocol suite IPX/SPX, used in older versions of Novell NetWare, is disappearing as companies upgrade to newer versions of NetWare Levels of a protocol stack map to their functions in the OSI model
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Guide to Networking Essentials, Fifth Edition5 Connectionless Versus Connection- Oriented Protocols Protocols that use connectionless delivery place data on the network and assume it will get through Connectionless protocols aren’t entirely reliable Are fast: little overhead, don’t waste time establishing/managing/tearing down connections Connection-oriented protocols are more reliable and, consequently, slower Two computers establish a connection before data transfer begins In a connection, data is sent in an orderly fashion Ensures that all data is received and is accurate, or that suitable error messages are generated
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Guide to Networking Essentials, Fifth Edition6 Routable Versus Nonroutable Protocols The network layer (OSI) is responsible for moving data across multiple networks Routers are responsible for routing process Protocol suites that function at Network layer are routable or routed protocols; otherwise, they are called nonroutable TCP/IP and IPX/SPX are routable protocols An older and nearly obsolete protocol, NetBEUI, is a nonroutable protocol that works well in small networks, but its performance drops considerably as a network grows
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Guide to Networking Essentials, Fifth Edition7 Protocols in a Layered Architecture
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Guide to Networking Essentials, Fifth Edition8 Protocols in a Layered Architecture (continued)
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Guide to Networking Essentials, Fifth Edition9 Network Protocols Some popular network protocols include: Internet Protocol version 4 (IPv4 or simply IP) Provides addressing and routing information Internetwork Packet Exchange (IPX) Novell’s protocol for packet routing and forwarding Belongs to the IPX/SPX protocol suite Serves many of the same functions as TCP/IP’s IP Internet Protocol version 6 (IPv6) A new version of IP that’s being implemented on many current networking devices and operating systems Addresses some weaknesses of IPv4
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