WAN Topologies

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Wide area Network (WAN) Topologies

Wide area Network (WAN) TopologiesCompTIA Network+ EXAM N10-006 TEST Objective - 1.6 Differentiate Between Common Network Topologies


What is a Network topology?Network topology is the way various components of a network (nodes, links, peripherals, etc.) are arranged. Network topologies define the layout or structure of a network.

A topology is either logical or physical.

Logical topology is the way information flows between different components.

Physical topology is the physical layout of nodes, workstations and cables in the network.

Correlate to network design

Network node - anode is either a connection point, a redistribution point, or a communication endpoint (some terminal equipment). Thedefinitionof anodedepends on the networkand protocol layer referred to.

Physical Interconnection of components

Logical Traffic Flow2

1. BUS TOPOLOGYAlldevices are connected to a central cable, called thebus orbackbone. Busnetworks are relatively inexpensive and easy to install for small networks.Example: Peer-to-Peer EthernetNetwork

Ethernet NetworksDigital (DEC), Xerox, Intel3

2. STAR TOPOLOGYA star topology has all nodes connect through a central device such as a hub or switch. Each node has its own line and should one fail, it will not disrupt the entire topology.Example: Computer Workgroup

Workgroup Home Network4

3. RING TopologyThe ring topology is similar to the star topology in a physical sense but it is actually set around a logical ringusing a MAU (mediaaccess unit). A cable break in the ring networkmay bring down the entire network.Example(s): IBM Token Ring (Legacy), Fiber Optic Ring

IBM Token RingFiber Optic Ring5

4. Mesh Topology

A mesh topology does not evidence a pattern when it comes to relaying data.Full-mesh topology requires each node to be interconnected with each other.Partial-mesh topology is when nodes connect with more than one network node via a point-to-point link.Example: The World Wide Web

Full-Mesh Best Example - Internet6

5. Tiered TOPOLOGY Sites connected in star or ring formations which are interconnected at different levels. They are organized into layers to form hierarchical groupings.Example: Geographic Distributed Network

Flexibility, Practicality

T1 speed 1.54 mbpsT3 speed 44.736 mbpsDSL Digital Subscriber Link 128 kbps to 3 mbps7

CompTIA Network+ Practice QuestionWhat topology could result in a lack of all communication capabilities with a single connection break?

A. Full-Mesh

B. Partial-Mesh

C. Star

D. Ring

Some ring topologies feature the issue of a single break between two systems disrupts communication capabilities on the entire ring. Full- and partial-mesh networks do not suffer from this potential issue.8