$7.(4$ pts$)$ Suppose a process in host C has a UDP socket with port number $6789.$ Suppose both

host A and host B each send a UDP segment to host C with destination port number $6789.$

a$.$ Will both of these segments be directed to same socket at host C$?$

b$.$ If so$,$ how will the process at host C know that these two segments originated from

two different hosts?

$8.(4$ pts$)$ How many networked processes could theoretically be running on a host at once?

$9.(6$ pts$)$ Consider a TCP connection between host B and server C$.$ Suppose that the TCP

segments traveling from host B to server C have source port number $2345$ and destination

port number $443.$

a$.$ What are the source and destination port numbers for the segments traveling from

host C to host B$?$

b$.$ What can you deduce about server C$?$ What kind of server is it$?$

$10.(8$ pts$)$ The text covers the $$saw tooth$$ behavior that occurs between a sender and a

receiver?

a$.$ What protocol is associated with this behavior?

b$.$ What specific algorithm is associated with $$saw tooth$$ behavior?

$11.(8$ pts$)$ Concerning methods for controlling congestion on a network.

a$.$ What are the $2$ approaches to congested control?

b$.$ List a network technology or protocol covered in the textbook that uses the

congestion control approaches you listed in part a$.$

$12.(4$ pts$)$ Examine the tcp segment header. The flag field contains $9$ bits in the segment structure.

a$.$ What does the last bit, $($reading the bits from left to right$),$ signify?

b$.$ When is it used?

$13.(4$ pts$)$ Refer to page $257$ in the text.

a$.$ What portion of the tcp session is used as an attack?

b$.$ What is the purpose of a SYN cookie?

$14.(12$ total pts$)$ Refer to section $3\mathrm{.}2\mathrm{.}2$ in the textbook that starts on page $202$ to help you with

this question. Answer questions a through d $($the values used in the text book are $16$ bits

long, but $8$ bit sequences will be easier to work with for this question$)$

a$.$ Add these two $8$ bit integers together and provide their sum in both binary and decimal:

$00110111$

$01010011$

b$.$ What is the $1$ complement of the binary number: $00001111?$

c$.$ Compute the checksum for the UDP segment with these $8$ bit values:

$01010111$ Src port

$01110001$ Dst port

$00011000$ length

d$.$ A receiver examines a UDP segment with the following $8$ bit values. Will the receiver

drop this packet?

$01011000$ Src port

$00011100$ Dst port

$11001101$ length

$10111101$ chksum

e$.(4$ pts$)$ Validate your answer by showing your work.