MIT 6 263 - Network Layer in Practice (34 pages)

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Network Layer in Practice



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Network Layer in Practice

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Pages:
34
School:
Massachusetts Institute of Technology
Course:
6 263 - Data Communication Networks

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Network Layer in Practice IP and ATM Eytan Modiano Massachusetts Institute of Technology Laboratory for Information and Decision Systems Eytan Modiano Slide 1 The TCP IP Protocol Suite Transmission Control Protocol Internet Protocol Developed by DARPA to connect Universities and Research Labs Four Layer model Applications Transport Network Link Telnet FTP email etc TCP UDP IP ICMP IGMP Device drivers interface cards TCP Transmission Control Protocol UDP User Datagram Protocol IP Internet Protocol Eytan Modiano Slide 2 Internet Sub layer A sub layer between the transport and network layers is required when various incompatible networks are joined together This sub layer is used at gateways between the different networks In the internet this function is accomplished using the Internet Protocol IP TP TP IP NET1 NET2 NETn IP enables interoperability Eytan Modiano Slide 3 Internetworking with TCP IP FTP client FTP Protocol TCP TCP Protocol FTP server TCP ROUTER IP IP Protocol IP Protocol IP IP Ethernet driver Ethernet Protocol Ethernet Eytan Modiano Slide 4 Ethernet driver token ring driver token ring Protocol token ring token ring driver The TCP IP Suite ping Telnet Rlogin FTP SMTP X Trace route TFTP UDP TPC ICMP IP ARP Data Link media Eytan Modiano Slide 5 DNS IGMP RARP BOOTP SNMP RPC NFS IP addresses 32 bit address written as four decimal numbers One per byte of address e g 155 34 60 112 Hierarchical address structure IP Address classes Network ID Host ID Port ID Complete address called a socket Network and host ID carried in IP Header Port ID sending process carried in TCP header 8 32 0 Net ID Host ID Class A Nets 16 10 Net ID 32 Host ID Class B Nets 24 110 Net ID 32 Host ID Class D is for multicast traffic Eytan Modiano Slide 6 Class C Nets Host Names Each machine also has a unique name Domain name System A distributed database that provides a mapping between IP addresses and Host names E g 155 34 50 112 plymouth ll mit edu Eytan Modiano Slide 7 Internet Standards



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