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【正文】 No. of Hosts = 65534 (2^162) We need 6 Subs 255 255 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 224 演講完畢，謝謝觀看！ 。 Inter Protocol Overview TCP/IP and the DoD Model IP Addressing Subting TCP/IP and the DoD Model Comparison of Dod and OSI Model The TCP/IP protocol suite The Process / Application layer Protocols The HosttoHost Layer Protocols The Inter Layer Protocols Comparison of DoD and OSI Model (1) ? The TCP/IP suite was created by the DoD ? The DoD model is a condensed version of the OSI model Application Presentation Session Transport Network Data Link Physical Process / Application HosttoHost Inter Network Access DoD Model OSI Model ? Nodetonode application munication ? Controls userinterface specifications ? Setting up the level of transmission service for applications ? Takes care IP address and designate protocols for logical transmission of packets over the entire work ? Oversees hardware addressing and defines protocols for the physical transmission of data Comparison of DoD and OSI Model (2) TCP/IP Model OSI Model The TCP/IP Protocol Suite Process / Application Tel TCP UDP IP ICMP ARP LAN Technologies: Ether, Fast Ether, Token Ring, FDDI WAN Technologies: Serial Lines, Frame Relay, ATM RARP HosttoHost Inter Network Access FTP TFTP SMTP LPD SNMP NFS X Window BootP/ DHCP DNS IGMP The Process / Application Layer Protocols ? Tel – Telephone Network ? FTP – File Transfer Protocol ? TFTP – Trivial File Transfer Protocol ? NFS – Network File System ? SMTP – Simple Mail Transfer Protocol ? LPD – Line Printer Daemon ? X Window – writing a GUIbased client/server applications ? DNS – Domain Name Service (DNS) ? BootP – Bootstrap Protocol ? DHCP – Dynamic Host Configuration Protocol The HosttoHost Layer Protocols ? To shield the upperlayer applications from the plexities of the work ? TCP (Transmission Control Protocol) ? Break down data from upper layers into Segment ? Numbers and sequences each segment ? Connectionoriented – virtual circuit required ? User Datagram Protocol (UDP) ? Break down data but not sequence the segment ? Thin protocol which doesn’t take up much bandwidth on a work ? Connectionless – no virtual circuit required, thus unreliable ? For sending little message and reliability acplished at the upper layers Transmission Control Protocol (TCP) ? Connectionoriented ? Session is established before exchanging data ? Virtual circuit required ? Reliable Delivery ? Sequence numbers ? Acknowledgments (ACKs) ? Doesn’t trust the lower layers and runs its own CRC ? Uses Port Numbers as Endpoints to Communicate TCP
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