CS 350 Chapter-6. A brief history of TCP/IP 1983 TCP/IP came to ARPAnet ARPAnet and MILNET dissolved in 1990 BSD UNIX.

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Presentation transcript:

CS 350 Chapter-6

A brief history of TCP/IP 1983 TCP/IP came to ARPAnet ARPAnet and MILNET dissolved in 1990 BSD UNIX

TCP/IP and the DoD Model Process/ApplicationHost-to-HostInternet Network Access

The Application Layer Protocols Telnet File Transfer Protocol (FTP) Secure File Transfer Protocol (SFTP) Trivial File Transfer Protocol (TFTP) Network File System (NFS)

The Application Layer Protocols Simple Mail Transfer Protocol (SMTP) Post Office Protocol (POP) Internet Message Access Protocol, Version 4(IMAP4) Transport Layer Security (TLS) Session Initiation Protocol (SIP) (VOIP) Real-time Transport Protocol (RTP) (VOIP)

The Application Layer Protocols Line Printer Daemon (LPD) -- printer Line Printer Remote(LPR) -- client X Window Simple Network Management Protocol (SNMP) Secure Shell (SSH) Hyper Transfer Protocol (HTTP) Hyper Transfer Protocol Secure (HTTPS)

The Application Layer Protocols Network Time Protocol (NTP) Network News Transfer Protocol (NNTP) Secure Copy Protocol (SCP) Lightweight Directory Access Protocol (LDAP) Internet Group Management Protocol (IGMP) Domain Name Service (DNS) Dynamic Host Configuration Protocol (DHCP)

The Host-to-Host Layer Protocols Transmission Control Protocol (TCP) Source port (16 bits)Destination Port (16 bits) Sequence number (32) Acknowledge number (32) Header length(4) Reserved (6) Code Bits (6)Window (16) Checksum (16)Urgent (16) Options (0 or 32 if any) Data (varies)

The Host-to-Host Layer Protocols User Datagram Protocol (UDP) Source port (16 bits)Destination Port (16 bits) Length (16)Checksum(16) Data (if any)

The Host-to-Host Layer Protocols TCPUDP SequencedUnsequenced ReliableUnreliable Connection-orientedConnectionless Virtual circuitNo virtual circuit High overheadLow overhead AcknowledgementsNo acknowledgements Windowing flow controlNo Windowing or flow control

Port Number TCPUDP Telnet 23SNMP 161 SMTP 25TFTP 69 HTTP 80DNS 53 FTP 20, 21BOOTPS/DHCP 67 DNS 53 HTTPS 443 SSH 22

The Internet Layer Protocols Internet Protocol (IP) Version(4)Header Length (4) Priority and Type of Service(8) Total Length(16 bits) Identification (16)Flags(3)Fragment offset (13) Time to Live (8)Protocol (8)Header Checksum (16) Source IP Address (32) Destination IP Address (32) Options (0 or 32 if any) Data (varies if any)

Internet Control Message Protocol (ICMP) Characteristics Provide hosts with network problem information Encapsulated in IP datagrams ICMP messages Destination Unreachable Buffer full Hops – reach hop number Ping – check connectivity Traceroute – discover the path

ARP and RARP

Data Encapsulation Data transmission Address in layers