Chapter 4 Types of Network 4.1LAN and WAN LAN and WANLAN and WAN 4.2Network Topology Network TopologyNetwork Topology Bus Star Ring Mesh.

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  • Chapter 4 Types of Network4.1LAN and WAN4.2Network TopologyBusStarRingMesh

  • 4.1 LANs, MANs and WANsAccording to the geographical area covered, networks can be classified into LAN Local Area NetworkMANMetropolitan Area NetworkWANWide Area NetworkPANPersonal Area NetworkChapter 4 Types of Network

  • 4.1.1 LANLocal Area Network (LAN) formed by joining computers in short distancese.g. within the same building or within a campuscan be found in home, offices, schools and universities, etc. the technology used is mainly Ethernetmaximum effective length of UTP cable < 100 msometimes need fiber-optic cables

    Chapter 4 Types of Network

  • 4.1.1 LANChapter 4 Types of Network

  • 4.1.2 MANMetropolitan Area Network (MAN) connects two or more LANs within a specific geographic regione.g. town/cityEach LAN is connected to a routerby long distance communication linksphone linesmicrowave fiber-optic cable mainly privateusers are required to login to use the serviceexcept for those maintained by ISPsChapter 4 Types of Network

  • 4.1.2 MANChapter 4 Types of Network

  • 4.1.3 WANWide Area Network (WAN) connects two or more LANsdistances measured in miles across countriesby routers and communication linksLarge companies: private WANs each branch form a LANlinked together to form the WANThe Internet public WAN supported by ISPs all over the world

    Chapter 4 Types of Network

  • 4.1.3 WANChapter 4 Types of Network

  • PANPersonal Area Network (PAN)linking mobile devices to a computerMainly BlueTooth

    Chapter 4 Types of Network

  • 4.1.4 Users ViewUserscannot easily distinguish between LAN, MAN and WAN because they look and operate in similar wayChapter 4 Types of Network

  • 4.2 Network TopologyNetwork topologythe shape of the logical linking of devices on a networkCommon topologiesbusstar ringChapter 4 Types of Network

  • 4.2.1 Bus Topology (1/2)Bus topology consists of a long cable to link the devices on the networkshared medium usually a coaxial cable Adv: easy to install least amount of cable Disadv: difficult to trouble-shootmain cable fails entire network failsTypical examples Ethernet 10Base-2, 10Base-5

    Chapter 4 Types of Network

  • 4.2.1 Bus Topology (2/2)Chapter 4 Types of Network

  • 4.2.2 Star Topology (1/2)Star topologyconsists of a cable concentratorhub/switchall data transfer pass throughAdv.easy to maintainflexible in adding or removing nodesfailure of a node will not affect whole networkDisadv.hub fails entire network failslargest amount of cableshub-based can be deteriorate if the network growsExamples:Almost all Ethernet networks & Wireless LAN except for the old 10Base-2 and 10Base-5Chapter 4 Types of Network

  • 4.2.2 Star Topology (2/2)Chapter 4 Types of Network

  • 4.2.3 Ring Topology (1/3)Ring topology connects devices in a closed ringData travels in one directionuntil it reaches the destination or returns to the senderAdv.can support large number of nodesDisadv.a node fails entire network failsexpensiveExamples:Token Ring -- common in mainframe systemsChapter 4 Types of Network

  • 4.2.3 Ring Topology (2/3)Chapter 4 Types of Network

  • 4.2.3 Ring Topology (3/3)Physical Wiring of a ring networknodes are connected to a central device called Multistation Access Unit (MAU) cables are physically wired in a starChapter 4 Types of Network

  • 4.2.4 Comparison between TopologiesChapter 4 Types of Network

  • 4.2.5 Mesh TopologyMesh topologyeach computer connects to all other computersmost expensiveredundancy fault-tolerantChapter 4 Types of Network

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