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NETWORK PHYSICAL TOPOLOGIES - Coggle Diagram
NETWORK PHYSICAL TOPOLOGIES
STAR
Advantages:
Fast performance with few nodes and very low network traffic
Easy to troubleshoot, set up, and modif
Only those nodes are affected, that has failed. Other nodes still work.
In Star topology, addition, deletion, and moving of the devices are easy.
Disadvantages
If the hub or concentrator fails, attached nodes are disabled.
Cost of installation of star topology is costly
Heavy network traffic can sometimes slow the bus considerably
Performance depends on the hub's capacity
Characteristics
All cables run to a central connection point
If one cable breaks or fails, only the computer that is connected to that cable is unable to use the network.
A star topology is scalable.
Figure
MESH
Advantages
The network can be expanded without disrupting current users. .
Need extra capable compared with other LAN topologies.
No traffic problem as nodes has dedicated links.
Disadvantages:
Installation is complex because every node is connected to every node
It is expensive due to the use of more cables. No proper utilization of systems.
Complicated implementation
It requires more space for dedicated links.
Characteristics
A mesh topology provides redundant links across the network
If a break occurs in a segment of cable, traffic can still be rerouted using the other cables.
This topology is rarely used because of the significant cost and work involved in having network components directly connected to every other component.
Figure
BUS
Advantages
Cost of the cable is very less as compared to other topology, so it is widely used to build small networks.
Famous for LAN network because they are inexpensive and easy to install
It is widely used when a network installation is small, simple, or temporary.
Disadvantages
In case if the common cable fails, then the entire system will crash down.
When network traffic is heavy, it develops collisions in the network
Whenever network traffic is heavy, or nodes are too many, the performance time of the network significantly decreases.
characteristics
all nodes or devices are linked with one transmitter or server computer via a single cable (mostly coaxial cable) called backbone. All nodes are connected to the bus cable by drop lines. A drop line is a connection running between the nodes and the main cable.
Figure
EXTENDED STAR
Advantages
The performance is better in extended star topology compared to bus topology. As there is no unnecessary transmission of messages in the network. The message is transferred only between source node, a central hub and destination node
Ease of adding devices as network expansion happens
One node failure do not bring down entire network
Disadvantages
As all nodes are connected to central hub it requires more wire at each node to connect to central hub which increases its setup cost hence it requires more cable than a bus or ring network
As all nodes are connected to the central hub and if central hub goes down it will lead to whole network failure and bring down entire network
Increase in number of connected nodes will decrease the performance of central hub or switch and will cause network congestion
characteristics
A hierarchical or extended star topology is a star network with an additional networking device connected to the main networking device. Typically, a network cable connects to one switch, and then several other switches connect to the first switch.
Figure
