Question 1.) 
 a.) Q: R6, first part. 
     A: Yes.

 b.) Q: R7, first part.
     A: Yes.

 c.) Q: R9.
     A: 1.c.1 - Sequence numbers are required for a receiver to 
                find out whether an arriving packet contains new 
                data or is a retransmission

Question 2.) R14
 a.) false
 b.) false
 c.) true
 d.) false
 e.) true
 f.) false
 g.) false

Part 3.) R15
 a.) Q: R15.a
     A: Cannot be decided from the given information

 b.) Q: R15.b
     A: ACK = 110.

 c.) Q: R16.a
     A: 3

 d.) Q: R18
     A: true

Question 4.) 
 Q: P5, first part. 
 A: No, the receiver cannot be absolutely certain that no bit errors have occurred.

Question 5.) 
 a.) Q: P24.a
     A: The sequence number is 289, the source port number is 503 and the destination
        port number is 80.

 b.) Q: P24.b
     A: 5.b.2 The acknowledgement number is 289, the source port number is 80 and the
        destination port number is 503.

 c.) Q: P24.c
     A: 5.c.4 The acknowledgement number is 309.