Software Componets of TCP/IP

Application Layer

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Some of the applications we will cover are SMTP (mail), Telnet, FTP, Rlogin, NFS, NIS, and LPD

Transport Layer

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The transport uses two protocols, UDP and TCP. UDP which stands for User Datagram Protocol does not gaurentee packet delivery and applications which use this must provide their own means of verifying delivery. TCP does gaurentee delivery of packets to the applications which use it.

Network Layer

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The network layer is concerned with packet routing and used low level protocols such as ICMP, IP, and IGMP.In addition, routing protocols such as RIP, OSPF, and EGP will be discussed.

Link Layer

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The link layer is concerned with the actual transmittal of packets as well as IP to ethernet address translation.This layer is concerned with Arp, the device driver, and Rarp. Over the next few months we will be examining these components as we work our way up from the bottom. First, we need to get a basic upderstanding of how networks are designed and how the basic hardware used to interconnect them.