HW2_Solution_edited

HW2_Solution_edited - Problem 6.1 There are advantages and...

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INFSCI 1004 & TELCOM 2000 Homework 2 Problem 3.4 N (N-1) /2= 50 * 49 / 2 = 1225 Problem 3.9 a) Client-server b) Peer-to-peer c) Partitioned. Databases are separated, no duplication d) Yes. Clients from one zone will not probably shop often in the other zone. The approach will be effective. e) Clients from one zone will probably shop often in the other zone. From this point of view the approach will not be effective. If there is a goal to reduce load on each data center, this approach may help, although traffic between the centers will be significant. Problem 3.13 The potential criteria may include economical factors; performance requirements (response time, reliability); system scalability; traffic exchange characteristics; security, etc.
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Unformatted text preview: Problem 6.1 There are advantages and disadvantages in both methods: If the server sends multiple messages: Advantages: reliability increases (if a copy of a message is corrupted or lost, other copies will still be delivered). Disadvantages: load on the server increases (multiple communication sessions have to be initiated; each e-mail has to be processed separately); more traffic in the channel; If use mail-bag: Advantages: load on the server decreases; less traffic on the network Disadvantages: load of intermediate nodes in the network increases; if a message is lost on the common route, all copies of the message are lost Also, the common route may not exist at all or it can be very “short” (for example, one hop)....
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