Homework Asssignment 6

Due in Class Thu Nov 16

1. W & V Chapter 4 Problem 12

2. In transport protocols, the maximum lifetime
of a packet is an important parameter. Should
this time ensure that the packet dies or that
both the packet and its acknowledgement die?
Explain your answer.

3. In TCP, we use a three-way handshake to
establish a connection. Give an example of
where a two-way handshake can fail.

4. If IP does fragmentation and reassembly,
does that mean that TCP does not have
to worry about such issues? Explain.

5. Consider two 100 MIPS computers exchanging
4 KB packets over a gigabit line. Suppose that
10,000 packets/sec are generated. How many
instructions can the computers use to deal
with each packet if they
want to reserve half their time for other
tasks? What happens if the packets are 128 bytes
but we want to exchange the same amount of
information but the processing time per packet
is the same?

6. Consider a possible future modification to
TCP to run over a fiber optic line operating
at 75 Tbps. Would 32 bit sequence numbers be
sufficient? What about 64 bit sequence numbers?