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Part3: TCP/IP Protocol Suite and IP Addressing

TCP/IP model development: The late-60s The Defense Advance Research Projects Agency (DARPA) originally developed Transmission Control Protocol/Internet Protocol (TCP/IP) to interconnect various defense department computer networks. The Internet, an International Wide Area Network, uses TCP/IP to connect networks across the world. | References Computer Network Table of Content 1. Data- Computer Communication handbook- William Stallings 2. TCP IP Illustrated Volume I - W.R. Stevens 3. CCNA- semester1-2-3-4 1 Part3. TCP IP Protocol Suite and IP Addressing 1 Introduction to TCP IP Model 2 Internet addresses 3 IP Format 3 ICMP 4 TCP 5 UDP INTRODUCTION TO TCP IP TCP IP model development The late-60s The Defense Advance Research Projects Agency DARPA originally developed Transmission Control Protocol Internet Protocol TCP IP to interconnect various defense department computer networks. The Internet an International Wide Area Network uses TCP IP to connect networks across the world. TCP IP protocol stack FTP HTTP SMTP DNS on IP k level Multiple higher-ayer protocols o applications Multiple lower-ayer protocols o physical links Only IP rotocol at the letwork layer. Internal Using in ptithcm 1 Internal Using in ptithcm 2 Internet layer other protocols Routing protocols - RIP RIPng for IPv6 - OSPF v2 V3 - BGP For security - 802.1X - IPsec - SSL TLS - SSH For QoS control RSVP. IP Datagram Format bit 0 header __ length controlling a 23 24 total length in bytes Ml fragmenting and re-assembly functions using tota ength identification don t fragment more flag and fragment offset fields IP Datagram Format bit 0 7 8 15 16 23 24 31 header version length OS ECN total length in bytes Identification 0OM gr-gment ffset time-to-live TTL protocol header checksum 1 source IP address Header checksum field detects error occurring payload -4 bytes- IP Datagram Format bit 0 16 23 24 ECN total length in bytes version length Identifi cation D M _ . 0 LL Fragment offset time-to-live TTL 1 protocol so 1 header checksum address --------Protocol field specifying the higher-layer protocol. Time I -Protocol field value of Spe 06 TCP 01 ICMP 17 UDP 08 EGP RoleoiiiLii eid Ensuretiai pactseiiseveriiuaiiy dropped when a routing loop occurs Used as follows Sender sets the value e.g. 64 Each router decrements the value by 1 When the