1. In the text the discussion of transport services flow control with a reliable network service referred to backpreassure mechanism utilizing a lower-level flow control protocol. Discuss the disadvantages of this strategy.
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

2. Draw a similar diagram to that of 17.5 in the text for the following ( assume a reliable sequenced network service):
 

a. Connection termination: active/passive

b. Connection termination: active/active

c. Connection rejection
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

3. With a reliable sequencing network service, are segment sequence numbers strictly necessary? What , if any, capability is lost without them.
 
 
 
 
 
 
 
 
 
 
 
 
 

4. With regard to transport services is deadlock possible if a two way handshake is used instead of a three way handshake? Give an example or prove otherwise?
 
 
 
 
 
 
 
 
 
 
 
 
 

5. Listed below are four strategies that can be used to provide a transport user with the address of the destination transport user. For each of the following give an analogy with a postal service user.
 

a. Know the address ahead of time.

b. Make use of a "well know address"

c. Use a name server.

d. addressee is spawned at request time.
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

6. In a credit flow control scheme such as TCP, what provision could be made for credit allocations that are lost or disordered in transit?
 
 
 
 
 
 
 
 
 

7.Compare/Contrast CSMACD and Token Ring?
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

8. Discuss the key aspects of ATM that make it different from other data communications architectures.
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

9.Discuss the key aspects of Frame-Relay that make it different from other data communications architectures
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

10. List all 16 possible values of the GFC field for ATM and the interpretation of each value ( Some values are not legal).
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

11. What is the difference between a VPC and a VCC in ATM networks?