CCNA: What is Network Topology Explanation

Network Topology

A Topology provides a different layout to create a Network. While Connecting Computers and networking Devices together to form a network, the user needs to consider the structure. Layout and cabling requirements. Topology is a Network pattern that Describes the way in which Networking Devices are Connected


There are mainly two types of Topology

Physica TopologyLogical Topology
Refers to the actual, physical structure of the NetworkDefines the passage of data through the Network across Devices and signals perform on the network media.







In the Language of networking, a “Bus” is central Cable or single coaxial cable the Connects all  Device on a Local-Area Network (LAN). It is also called the backbone. This is often used to describe the main Networks connections Constituting the Internet. Bus Networks are fairly inexpensive and are easy to install therefore ideally suitable for small networks. Ethernet systems utilized a Bus Topology.


Primary Advantage:

  • This method makes it easy to Connect a Computer or device to the central cable and Typically requires less cable than the Star Topology Option


  • The entire Network shuts Down there is a break in the main Cable.
  • It is difficult to identify the cause for the problem if the Network shuts down.


Star Topology

In a Star Network Topology, systems are connected to a central node, called a hub or switch. The device communicates across the network by passing data through the central node.

Illustration of Star Topology

Primary  Advantage

  • One Faulty node does not affect the rest of the network.


  • central node fails, the entire network becomes unusable.


Ring Topology

This is a Local Areas Network (LAN) whose topology is in the form of a ring. That is, all the nodes are connected in a closed-loop. Data travels through Many points before reaching its Destination which makes it an inefficient network in Comparison to a Star network.


Primary Advantage

  • Ring networks can span larger distances than other types of Networks ( Bus Networks). AND  each node regenerates messages as they pass through it.


Tree Topology

This is a ‘Hybrid’ Topology that combines Characteristics of both the linear Bus and Star Topologies. In a Tree Network. Groups of Star-configured Networks are Connected to a linear Bus Backbone Cable.



Primary Advantage

  • A Tree Topology is a better choice for large Computer Networks as it ‘Devices’ the whole networks into easily manageable parts.


  • The dependency of the whole networks is on a central hub.
  • Failure of the Central hub can cripple the whole Network.



Mesh Topology

In a Mesh Network Devices are Connected with many redundant interconnections between network nodes. in a true mesh topology, every node has a link to another node in the network


There are two types of Mesh Topology

  1. Full Mesh Topology
  2. Partial Mesh Topology


Full Mesh Topology

In this Topology, every node has a circuit joined to every other node in a network. Though this incurs a high execution cost, it yields the best measure of idleness or redundancy, which can support the diversion of system activity to alternate hubs. even If by chance, any one of those nodes fails flat. A full Mesh, Topology is typically deployed in backbone Networks.


Partial Mesh Topology

This topology comparatively cost less to actualize but also yields less redundancy. The arrangement as the term indicates is partial, A few nodes are configured in a full mesh while others are just associated with maybe a couple of nodes in the Networks.




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