TAILIEUCHUNG - Lecture Network + Guide to Networks (5th edition) - Chapter 4: Introduction to TCP/IP protocols

Chapter 4 introduction to TCP/IP protocols. Objectives in this chapter: Identify and explain the functions of the core TCP/IP protocols; explain how the TCP/IP protocols correlate to layers of the OSI model, discuss addressing schemes for TCP/IP in IPv4 and IPv6 protocols,. Inviting you to refer. | Objectives cont d. Describe the purpose and implementation of DNS Domain Name System and DHCP Dynamic Host Configuration Protocol Identify the well-known ports for key TCP IP services Describe common Application layer TCP IP protocols 9 7 2011 Objectives Identify and explain the functions of the core TCP IP protocols Explain how the TCP IP protocols correlate to layers of the OSI model Discuss addressing schemes for TCP IP in IPv4 and IPv6 protocols Characteristics of TCP IP Transmission Control Protocol Internet Protocol Protocol Suite - TCP IP - Subprotocols TCP IP UDP ARP Developed by Department of Defense - ARPANET 1960s Internet precursor 1 Characteristics of TCP IP cont d. Popularity - Low cost - Communicates between dissimilar platforms - Open nature - Routable Spans more than one LAN LAN segment - Flexible Runs on combinations of network operating systems or network media Disadvantage requires more configuration The TCP IP Core Protocols TCP IP suite subprotocols Operates in Transport or Network layers of OSI model Provide basic services to protocols in other layers Most significant protocols in TCP IP - TCP - IP 9 7 2011 TCP Transmission Control Protocol Transport layer protocol Provides reliable data delivery services - Connection-oriented subprotocol Establish connection before transmitting with the TCP Handshake - Sequencing and checksums - Flow control Transmitter waits for ACK before sending more TCP segment format - Encapsulated by IP datagram in Network layer Becomes IP datagram s data 2 TCP Segment Bit number 0 16 31 TCP header TCP Handshake Computer A sends SYN to Computer B - SYN flag set SEQ field Random initial sequence number ISN ACK field Empty zeroes Computer B replies with SYN ACK - SYN and ACK flags set SEQ field Computer B s random initial sequence number ISN ACK field Computer A s ISN plus 1 Computer A responds with ACK - ACK flag set SEQ field Computer A s ISN plus 1 ACK field Computer B s ISN plus 1 9 7 2011 Important TCP Header Fields

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