Physical Topology

 Let's Learn about "Physical Topology"😊

• Physical structure of the network 
• Configuration of Cable, Computer, Other applications

01.Liner Bus Topology

           In a bus topology, nodes are strung together in a line. Think of the entire network as a single cable. With each nodes "tapping "into the cable so it can listen in on the packets being sent over that cable. In a bus topology, every node on the network can see every packet sent on the cable. Each node looks at each packet to determine whether the packet is intended for it .If so, the node claims the packet. If not the node ignores the packet. This way, each computer can respond to data sent to it but ignore data sent to other computers on the network. 

Advantages of liner bus topology:-👍

• Easy to connect a computer or peripheral to a liner bus.
• Requires less cable length than a star topology.
• Good for LAN.
• Mostly used in small network.                                                                               Disadvantages of liner bus topology:-👎
• Entire network shouts down if there is a break down in the main cable.
• Terminators are required at both ends of the backbone cable.
• Difficult to identify the problem if the entire network shouts down.
• Not meant to be used as a stand-alone solution in a large building.
• Security is very low we can see  all the computers receive the sent signal the source.
• Efficiency of bus network reduces as the number of devices connected to it increases.

  02.Ring Topology(Star-Wired)

In a ring topology, packets are sent around the circle from computer to computer. Each computer looks at each packet to decide whether the packet was intended for it. If not, the packet is passed on to the next computer in the ring.

03.Star Topology

In a star topology ,each network node is connected to a central device a hub or switch. star topologies are commonly used with LAN. if a cable in a star networks breaks, only the node connected to that cable is isolated from the network .the other nodes can continue to operate without interruption  unless, of course, the node that's isolated because of the break happens to be the file server.

Advantages of star topology:-👍

• Easy to install and wire.
• No disruptions to the network then connecting or removing devices.
• Easy to detect faults and to remove parts.

Disadvantages of star topology:-👎

• Requires more cable length than linear topology.
• If the hub or concentrator fails, nodes attached are disabled.
• More expensive.

04.Tree Topology

A Tree topology combines characteristics of liner Bus and Star topologies. It consists of groups of star-configured workstation connected to a Liner bus backbone cable. Tree topologies allow for the expansion of an existing network, and enable organization to configure a network to meet their needs.

Advantages of Tree topology:-👍

• Point to point wiring for individual segments.
• Supported by several hardware and software vendors.

Disadvantages of Tree topology:-👎

• Overall length of each segment id limited by the type of cabling used.
• If the backbone line breaks, the entire segment goes down.

05.Mesh Topology

In a mesh topology there is no central connection point. Instead, each node is connected to at least one other node and usually to more than one. Each node is capable of sending messages to and receiving messages from other nodes. The nodes act as relays, passing on a message towards its final destination. Full Mesh and Partial Mesh are two types of the Mesh Topology.                                                                                     5.1. Full Mesh Topology

Connects every single nodes together create the most redundant and reliable network around specially for large networks. If any link fails, we (should )always have another link to send data through.

5.2. Partial Mesh Topology

Much like the Full Mesh. Only we don't connect each device to every other device on the network.

What are the Considerations When choosing a Topology ?👀👇

• Money.
  
• Length of cable needed.
• Future growth.
• Cable type.
  

For more information you can watch following videos😋💪