The TCP/IP Reference Model
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- Erick Briggs
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1 The TCP/IP Reference Model The TCP/IP Model Comparison to OSI Model Example Networks
2 The TCP/IP Model Origins from ARPANET, DoD research network ARPA - Advanced Research Projects Agency Reliability was the primary concern of design IMP - interface message processor The TCP/IP Model defined in 1974 for the first time Figure from book Computer Networks 3rd ed., by A.S. Tanenbaum
3 The TCP/IP Reference Model
4 The Internet Layer Packet-switching, connectionless service Each packet is independently routed from source to destination Packet ordering issue Defines packet format Defines protocol - Internet Protocol (IP)
5 The Upper Layers Two end-to-end protocols in Transport layer: Transmission Control Protocol (TCP) - reliable connection oriented protocol User Datagram Protocol (UDP) - unreliable, connectionless protocol The Application layer initially Remote login protocol - Telnet File transfer protocol - FTP Electronic mail - SMTP Domain name service - DNS
6 Initial TCP/IP protocols Figure from book Computer Networks 3rd ed., by A.S. Tanenbaum
7 Comparison of OSI and TCP/IP OSI Introduces concepts of: 1. Services 2. Interfaces 3. Protocols Is more general than TCP/IP Model built before protocols Connection-oriented transport l. Network layer both c/o and c/l TCP/IP No explicit definitions of service, interface and protocol Model describes protocols Suitable only for TCP/IP networks Transport both c/o and c/l Network layer - connectionless
8 A Critique of The OSI Model and Protocols Bad timing Bad technology - too complex, redundant, etc. Bad implementations - complex, inefficient Bad politics Figure from book Computer Networks 3rd ed., by A.S. Tanenbaum
9 A Critique of The TCP/IP Model and Protocols No definitions of general networking concepts Not a general reference model Host-to-network layer is rather an interface No definition of data link nor physical layers Some application layer protocols were designed and implemented ad hoc
10 The Hybrid Model ISO/OSI - good model, poor protocols TCP/IP - poor model, protocols - standards de facto The hybrid model: Application layer Transport layer Network layer Data link layer Physical layer
11 The Novell NetWare Reference Model Figure from book Computer Networks 3rd ed., by A.S. Tanenbaum
12 Novell NetWare Networks Designed for LAN s of IBM PC compatible computers Proprietary network operating system Network and transport protocols similar to those in TCP/IP networks Client-Server model Centralized architecture: Dedicated servers Client portions in different operating systems
13 Novell NetWare Networks Open Data Link Interface (ODI) encapsulates services of device drivers Services provided File services Printing services Communication services: routing remote access gateway services Third party services: Database Application servers
14 Microsoft Windows NT Networking Model
15 Microsoft Windows NT Networking Network Device Interface Specification (NDIS) encapsulates services of device drivers TCP/IP and NETBEUI transport protocols are provided NETBEUI features: fast, low overhead single logical subnet LAN protocol non-routable provides network name abstraction Common Transport Driver Interface File, Printing, Communication services
16 The NETBEUI Protocol
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