TCP/IP Internetworking Chapter 8 Updated January 2007 Panos Business data Networks and Te/ecommunications, 6th edition 口口口 a copyright 2007 Prentice-Hall May only be used by adopters of the book
TCP/IP Internetworking Chapter 8 Updated January 2007 Panko’s Business Data Networks and Telecommunications, 6th edition Copyright 2007 Prentice-Hall May only be used by adopters of the book
Recap Single Networks(Subnets) Chapters 4 and 5 covered single lans Chapters 6 and 7 covered residential Internet access and single Wans Internets Connect multiple single networks using routers 70%-80% of internet traffic follows TCP/IP standards These standards are created by the ETF Chapter 10 looks in more detail at TCP/IP management 8-2
8-2 Recap • Single Networks (Subnets) – Chapters 4 and 5 covered single LANs – Chapters 6 and 7 covered residential Internet access and single WANs • Internets – Connect multiple single networks using routers – 70%-80% of internet traffic follows TCP/IP standards – These standards are created by the IETF – Chapter 10 looks in more detail at TCP/IP management
Figure 2-8: Hybrid TCP/IP-osI Architecture layer Recap General Purpose Specitic Purpose Application-application Application(5)Application-application communication interworking Transmission across an Transport(4) Host-host internet communication Internet (3) Packet delivery across an internet Transmission across a Data Link (2) Frame delivery across a single network(LAn or network WAN Physical (1) Device-device TCP/IP standards dominate at the internet and transport layers transmission across an internet 8-3
8-3 Figure 2-8: Hybrid TCP/IP-OSI Architecture General Purpose Layer Specific Purpose Application-application communication Application (5) Application-application interworking Transmission across an internet Transport (4) Host-host communication Internet (3) Packet delivery across an internet Transmission across a single network (LAN or WAN) Data Link (2) Frame delivery across a network Physical (1) Device-device connection Recap TCP/IP standards dominate at the internet and transport layers— transmission across an internet
Figure 2-11: Internet and Transport Layer, Cont Recap Transport Layer end-to-end (host-to-host) Server Client Pc TCP is connection -oriented reliable UDP is connectionless and unreliable Internet Layer (usually IP) hop-by-hop(host-router or router-router) connectionless unreliable Router 1 Router 2 Router 3
8-4 Figure 2-11: Internet and Transport Layer, Cont. Transport Layer end-to-end (host-to-host) TCP is connection-oriented, reliable UDP is connectionless and unreliable Internet Layer (usually IP) hop-by-hop (host-router or router-router) connectionless, unreliable Router 1 Router 2 Router 3 Client PC Server Recap
Frames and packets Recap Messages at the data link layer are called frames Messages at the internet layer are called packets Within a single network, packets are encapsulated in the data fields of frames Frame Packet Frame Trailer (Data Field) Header 8-5
8-5 Frames and Packets • Messages at the data link layer are called frames • Messages at the internet layer are called packets • Within a single network, packets are encapsulated in the data fields of frames Frame Header Packet (Data Field) Frame Trailer Recap