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Practice questions

posted Jun 18, 2009, 5:29 PM by Unknown user   [ updated Jun 21, 2009, 3:43 AM by Eddie Woo ]
Just to get you started!
  1. Describe situations in which each of the major network topologies would be the most appropriate.
  2. Converting a large organisation's information system from a wired infrastructure to a wireless infrastructure is a costly exercise. Identify specific costs involved and justify the conversion in spite of the cost.
  3. The internet used to be called "cyberspace", which alluded to the fact that things and people on the internet inhabited another world and had no relation to the real world. This is simply no longer the case. Discuss this reality with reference to real events that have been changed or made possible only by the use of the internet.
1. The six network topologies and when they are appropriate are:
 
Star - Useful for networks where a connection to every single node to another node is not necessary. For example,  the central server can also relay print tasks to the print server easily while in a bus, ring or mesh network this would have to travel across all the cables just to reach that print server.
Ring - Ring networks are useful for small private networks where a central server is not necessary and communication between the nodes results in minimum amount of cabling but at the same time data collision is not desired. Small amounts of cabling is required, in fact, only one cable is required to join each neighbouring nodes together. In a ring network the traffic is controlled by using tokens so no collisions of data traffic is experienced.
Bus - Bus networks are also useful for small private networks.
Mesh -
Tree - Useful for large corporations where worker computers do not need to be connected to the main computer for files or services. For example, if a document needs to be printed it needs only connect to the print server. If the connection is cut only the nodes in that path of a hierarchal tree is affected. This reduces cabling and when the cable is damaged it can be fixed quickly because the damage is easily located.
Point-in-Point - A direct connection between two nodes. For example, if for some reason a client wants to talk to another client directly a point to point connection is better because the cabling is at its minimum and a central server isn't necessary for the task. Since no other nodes are necessary for communication between the two nodes point-to-point is the bset option.
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