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Topologies

Session 2

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Topologies Topology refers to physical or logical

arrangement of network Physical topologies are

Single Node Bus Star Ring Mesh Tree Hybrid

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Single Node Topology Single device, at times device called dumb

terminal is connected to the server

Devices operates on files from server andreturns them back after completing task

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Single Node Topology Advantages:

Easy to install,

configure andmanage

Least expensive

Single cable isrequired

Disadvantages:

Network consists

of single device Dumb terminal is

dependent onserver

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Bus topology

All devices are connected to a common cablecalled trunk Maximum segment length of cable is 200 m Maximum of 30 devices per segment

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Bus topology

Advantages:

Installation of

devices is easy Requires less cable

compared to startopology

Less expensive andworks better forsmaller networks

Disadvantages:

If backbonebreaks, entirenetwork gets down

Difficult to isolateproblems

Limited number ofdevices

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Star Topology

Each device is connected to a central devicecalled hub through cable Data passes through hub before reaching

destination

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Ring Topology

Advantages:

Data travels atgreater speed

No collisions

Handles largevolume of traffic

Disadvantages:

More cabling isrequired comparedto bus

One faulty deviceaffects the entirenetwork

Addition of devices

affect network

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Dual Ring Topology Consists of twoindependentprimary andsecondary rings

Secondary ring isredundant, usedonly when primarystops functioning

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Mesh Topology

Used in WANs tointerconnect LANs

Every device isconnected to everyother device

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Type

Types

Full mesh Partial mesh

Full mesh topology All devices are connectedto each other

Partial mesh topology - Some devices areconnected to only those with whom theyexchange most of the data

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Tree Topology

Tree topology is acombination of starand bus topology.

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Hybrid Topology

Combines two or more differentphysical topologies

Commonly Star-Bus or Star-Ring