tailieunhanh - Practical TCP/IP and Ethernet Networking- P20

Practical TCP/IP and Ethernet Networking- P20: The transmitter encodes the information into a suitable form to be transmitted over the communications channel. The communications channel moves this signal as electromagnetic energy from the source to one or more destination receivers. The channel may convert this energy from one form to another, such as electrical to optical signals, whilst maintaining the integrity of the information so the recipient can understand the message sent by the transmitter | Introduction to TCP IP 77 protocol the TCP component of TCP IP is the heart of the TCP IP suite of applications. It provides a very reliable method of transferring data in byte octet format between applications. This is described in RFC 793. The process and application layer This layer provides the user or application programs with interfaces to the TCP IP stack. At this level there are many protocols used some of the more common ones being File transfer protocol FTP which as the name implies is used for the transfer of files between two hosts using TCP. It is described in RFC 959 Trivial file transfer protocol TFTP which is an economic version of FTP and uses UDP instead of TCP for reduced overhead. It is described in RFC 783 Simple mail transfer protocol SMTP which is an example of an application which provides access to the TCP and IP for programs sending e-mail. It is described in RFC 821 TELNET telecommunications network which is used to emulate terminals and for remote access to servers. It can for example emulate a VT100 terminal across a network Other process application layer protocols include POP3 RPC RLOGIN IMAP Berbers HTTP and NTP. Users can also develop their own application layer protocols by means of a developer s kit such as Winsock. Figure The TCP IP protocol suite 6 Internet layer protocols Objectives When you have completed the study of this chapter you should be able to Explain the basic operation of all Internet layer protocols including IP ARP RARP and ICMP Explain the purpose and application of the different fields in the IPv4 header Invoke the following protocols capture their headers with a protocol analyzer and compare the headers with those in your notes IPv4 ARP and ICMP. You should be able to interpret the fundamental operations taking place and verify the different fields in each header Demonstrate the fragmentation capability of IPv4 using a protocol analyzer Explain the differences between class A B and C addresses and the .

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