1.2 How might the clocks in two computers that are linked by a local network be synchronized without reference to an external time source? What factors limit the accuracy of the procedure you have described? How could the clocks in a large number of computers connected by the Internet be synchronized? Discuss the accuracy of that procedure.
Ans:
Cristians Protocol is an example for the above.
By repeated tests we get the round trip time t that is to send Information and to get reply between two computers A and B. The clock setting for A is T and B sets the time to T + t/2. Due to the use of local network by other computers the procedure may subject to inaccuracy. There might be delay in processing the messages in the operating systems of A and B. For a local network, the accuracy is probably within …show more content…
In particular, what advantages do you see in adopting a single server approach for representing the state of the multiplayer game? What problems can you identify and how might they be resolved?
Ans: In this single server acts as centralized server. It is accessed by client programs running on consoles. Single server helps in management of virtual world and eases consistency concerns. It ensures fast response by optimizing network protocols and instant response to the incoming events. Here the load is divided and allocated to particular computers within the cluster, with highly loaded star. Incoming events are sent to the corresponding computers within the cluster by keeping track of movement of players between star systems.
1.4 A user arrives at a railway station that they has never visited before, carrying a PDA that is capable of wireless networking. Suggest how the user could be provided with information about the local services and amenities at that station, without entering the station’s name or attributes. What technical challenges must be overcome?