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Data and Computer Communications by William Stallings Eighth Edition

Internet Protocols. Data and Computer Communications by William Stallings Eighth Edition. Click to edit Master subtitle style. Chapter 18. Addressing. addressing level addressing mode. Addressing Level. level in architecture where entity is named

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Data and Computer Communications by William Stallings Eighth Edition

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  1. InternetProtocols Data and Computer Communications by William Stallings Eighth Edition Click to edit Master subtitle style Chapter 18 Networks and Communication Department

  2. Addressing • addressing level • addressing mode

  3. Addressing Level • level in architecture where entity is named • have a unique address for each intermediate and end system • usually a network-level address • e.g. IP address or internet address • e.g. OSI - network service access point (NSAP) • at destination data must routed to some process • e.g. TCP/IP port • e.g. OSI service access point (SAP)

  4. Addressing Mode • address usually refers to single system • individual or unicast address • can refer to more than one system for • multiple simultaneous recipients for data • broadcast for all entities within domain • multicast for specific subset of entities

  5. Internetworking Terms • Communication Network - A facility that provides a data transfer service among devices attached to the network. • Internet - collection of networks interconnected by bridges and/or routers. • Intranet - An internet used by a single organization that provides the key Internet applications, • End System (ES) - A device attached to one of the networks of an internet that is used to support end-user applications or services.(eg:server)

  6. Internetworking Terms • Intermediate System (IS) - A device used to connect two networks and permit communication between end systems attached to different networks.(eg:router,bridge) • Bridge - An IS used to connect two LANs that use similar LAN protocols. The bridge acts as an address filter, picking up packets from one LAN that are intended for a destination on another LAN and passing those packets on. The bridge operates at layer 2 of the OSI model. • Router - An IS used to connect two networks that may or may not be similar. The router operates at layer 3 of the OSI model.

  7. Requirements of Internetworking • link between networks • routing and delivery of data between processes on different networks • accounting services and status info

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