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A mesh network is a network topology in which computers are linked to one another in a pattern not covered by the other defined network topologies. A 'fully-connected network' is a mesh network in which every computer is connected to every other computer. This allows fast data transfer relative to other network topologies.

(Picture: An abstracted diagram of a mesh network. Green circles = computers. Lines = network cables. Note that this diagram depicts just one of a large variety of possible configurations of a mesh network.)

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A ring network is a network toplogyin which each computer of the network is connected only to two other computers, and the network connections form a ring. Ring networks can be either unidirectional (data moves in only one direction) or bidirectional (data can move in either direction). In order for data to travel between two computers in a ring network, it often must be handled by several other computers forming part of the intervening network connection.

(Picture: An abstracted diagram of a ring network. Green circles = computers. Lines = network cables.)

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Token ring is where you have the right to transmit data as long as you have a token, when you receive the token there is nothing on it and you put your data on it that you want to send and you put the location you are sending the data. the token is passed along each computer on that network until it has reached its final destination. when the token has been received, it is copied and can only be accessible for a certain amount of time before it is taken away.

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Star networks are one of the most common computer network topologies. In its simplest form, a star network consists of one central node, typically a switch or hub, which acts as a conduit to transmit messages. In star topology, every node (computer workstation or any other peripheral) is connected to a central node. The switch is the server and the peripherals are the clients.
Advantages:

If one node or its connection breaks it doesn’t affect the other computers and their connections.

Devices can be added or removed without disturbing the network

Disadvantages:

An expensive network layout to install because of the amount of cables needed

The central hub is a single point of failure for the network

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What is the difference between Token bus and ring

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What is the difference between Token bus and ring

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The difference is how it sends data and which way round it will send it.
So for the token bus it will be sent down the line using the numecrial order, jumping from station to station.
Where as with the token ring it sends the data round a closed ring. So the bus uses a virtual ring as it has termals on either end so therefore when information needs to be sent it will make a virtual ring with all the station that need to be involded with what and where its being sent.
Token ring if a station wants to send data or information it will wait to grab the token, then copy the data to be sent to the token waith the source and desturnation address and change the status to busy
So the real difference of these to being one being sent numecrialy and not round a ring.

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A Token Bus is a bus network that uses tokens to pass the data around instead of using the straight cable that runs through the system connecting it all, the token is passed around in the numerical order of the computers inside of just going directly to the computer the message is going to E.G. If the message is going from 1 to 6 instead of going straight there it will around all the computers in numerical order so 1, 2,3,4,5 and then number 6 will get the message and copy the message of the token and then someone else can send a message.

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A bus network is a network topologies in which nodes are directly connected to a common linear (or branched) half-duplex link called a bus.
Advantages:

Very easy to connect a computer or peripheral to a linear bus

Requires less cable length than a star topology resulting in lower costs

It works well for small networks.

Disadvantages:

Entire network shuts down if there is a break in the main cable or one of the T connectors break.

Large amount of packet collisions on the network, which results in high amounts of packet loss.