Reference no: EM13336474

Questions should be answered in your own words, answering only what you are asked. Answer the questions succinctly and clearly, explain your answer, and show your work. Answers, even if right but without an explanation, will get no credit. The explanations need to be brief, but complete, logical, and to the point. Do not quote anybody else, use your own words. Answers will be evaluated on the following criteria: key content, logical flow, and clarity.

1. Give two features that the data link layer and transport layer have in common. Give two features in which they differ. Hint: Compare what can go wrong to the PDUs that are handled by these layers.

2. Which of the OSI layers handles the following?

a) Accepting requests from remote machines to print files on a local printer.

b) Insuring that packets correctly reach the machine at the other end of a communication channel.

c) End-to-end communication between two hosts separated by a subnet.

d) Deciding whether to retransmit data that was lost.

e) Determining which route through the subnet to use.

f) Insuring that the absence of a light pulse lasting for 1 nanoseconds corresponds to a bit of 0.

g) Placement of a subroutine library that encrypts data, so that communicating applications protect the data on an end-to-end basis.

h) Providing node-to-node communications with reliable service

3. What protocol is used to provide your IP address automatically? How does it work?

4. What security features are/can be implemented in SMTP and MIME.

5. HTTP caching is an operation that can be controlled at the originating server, an intermediate node, or at the client browser application. What are the potential benefits and detriments associated with this mechanism (from the perspective of both the originator and client) as it is implemented?

6. What are the similarity and the distinction between client/server and intranet?

7. Given a network address of 193.43.9.47 and a subnet mask 255.255.255.224:

a) How many subnets are created?

b) How many hosts are there per subnet?

8. What are the current advantages and disadvantages of packet-switching compared to circuit switching?

9. Explain the difference between the network layer in a connection-oriented packet switching network and the network layer in a connectionless packet switching network?