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CIS-331
Final Exam
Total of 120 Points
Spring 2016
Version 1
1. (25 Points) Given that a frame is formatted as follows:
And given that a datagram is formatted as follows:
And given that a TCP segment is formatted as follows:
Assuming no options are present in the IP header and TCP header, And given the following frame with an
encapsulated IP datagram and TCP segment:
78
00
D9
5C
47
D9
09
28
82
72
D0
10
7E
36
46
84
BB
50
EB
FD
3E
C4
C6
7E
48
D3
BE
42
65
C0
A4
9A
0E 30
63 DA
57 BE
C0 74
E7 DB
3F BF
53 A4
4F 63
17
51
34
C6
AE
A6
B8
E0
B5
E4
8F
50
28
E5
03
6C
DE
9A
A4
47
75
5E
BE
7D
CD
0E
6C
51
C3
3F
D8
D9
B7
0A
99
B1
29
BB
C1
10
FD
97
EA
B8
B9
CE
0F
3D
08
F1
48
82
63
B4
83
E3
00 45
55 C8
50 B5
F3 AD
A4 C2
3B 2E
0D 87
EF EB
50
F3
37
FD
A3
C6
06
A5
CIS-331
Final Exam
Total of 120 Points
Spring 2016
Version 1
a.
b.
c.
d.
e.
f.
g.
h.
i.
j.
k.
l.
Find the source hardware address
Find the destination hardware address
What type of frame is this?
What is the Type Of Service in the IP
Header?
What is the fragment offset?
What is the TTL count?
Find the destination IP address
What class is the destination IP address?
What is the network ID in the destination
address?
What is the host ID in the destination
address?
Write the destination IP address in dotted
decimal notation.
Find the IP Header Checksum
m. Find the source IP address
n. What class is the source IP address?
o. What is the network ID in the source
address?
p. What is the host ID in the source address?
q. Write the source IP address in dotted
decimal notation.
r. Find the destination port.
s. Find the source port.
t. Find the acknowledgment number.
u. Find the sequence number.
v. What flags are set in the TCP header?
w. Find the TCP segment checksum.
x. Find the TCP window size.
y. What are the first 5 bytes of data
encapsulated inside the TCP segment?
2. (25 Points) Each router in the autonomous system shown below starts with a routing table showing the
networks that they are directly connected to. The routers exchange routing information using a
distance vector protocol. Show the messages that are exchanged and the state of the routing tables
after each message. Use the Routing Tables sheet(s).
CIS-331
Final Exam
Total of 120 Points
Spring 2016
Version 1
3. (20 Points) Consider a fixed subnet partition of the class B network 179.138.0.0. a. (5 Points) How many bits will be necessary to divide the network into 1012 subnets? b. (5 Points) What is the maximum number of hosts each subnet can have?
c. (5 Points) What is the subnet mask in dotted decimal notation?
d. (5 Points) Write the dotted decimal IP address of subnet 987, host 59. 4. (20 Points) Given the IP address 175.221.237.215 and the subnet mask of 255.255.252.0.
a. (10 Points) What is the network number? b. (5 Points) What is the subnet number?
c. (5 Points) What is the host number? 5. (10 Points) Explain Network Address Translation (NAT). What is it? Why do we need it? How does it work? Give examples. Draw diagrams. Be as specific as possible. 6. (10 Points) Explain how both the sender and the receiver control the flow over a TCP connection. Give
examples and be as specific as possible. 7. (10 Points) Explain how IPv6 handles fragmentation as it relates to datagrams. Where does it occur?
What is the minimum MTU in IPv6? When and where are the fragments reassembled? Give examples
and be as specific as possible. CIS-331
Final Exam
Total of 120 Points
Spring 2016
Version 1
This Page Is Intentionally Left Blank CIS-331
Final Exam
Total of 120 Points
Spring 2016
Version 2
1. (25 Points) Given that a frame is formatted as follows:
And given that a datagram is formatted as follows:
And given that a TCP segment is formatted as follows:
Assuming no options are present in the IP header and TCP header, And given the following frame with an
encapsulated IP datagram and TCP segment:
78
00
3F
F3
02
1A
2E
65
AB
72
F9
A4
F6
60
41
88
11
C7
C8
70
44
76
19
9D
40
7D
86
08
6B
66
B6
B9
1D
38
22
6D
91
0D
78
B7
F1
92
C4
A7
4B
F6
3A
5D
72
A7
23
24
51
B3
46
38
5B
DF
62
D2
2C
64
19
5B
6A
43
3D
71
10
16
09
BA
BB 43
CA AC
F2 8C
4A 04
31 CB
87 E0
9A DA
42 C9
D0
14
27
C7
61
52
65
A3
08
5F
CB
7A
EA
98
00
7D
00
75
22
8B
27
BF
E3
A5
45
0B
62
38
87
82
48
B0
2B
59
37
85
E4
D1
CA
6E
CIS-331
Final Exam
Total of 120 Points
Spring 2016
Version 2
a.
b.
c.
d.
e.
f.
g.
h.
i.
j.
k.
l.
Find the source hardware address
Find the destination hardware address
What type of frame is this?
What is the Type Of Service in the IP
Header?
What is the fragment offset?
What is the TTL count?
Find the destination IP address
What class is the destination IP address?
What is the network ID in the destination
address?
What is the host ID in the destination
address?
Write the destination IP address in dotted
decimal notation.
Find the IP Header Checksum
m. Find the source IP address
n. What class is the source IP address?
o. What is the network ID in the source
address?
p. What is the host ID in the source address?
q. Write the source IP address in dotted
decimal notation.
r. Find the destination port.
s. Find the source port.
t. Find the acknowledgment number.
u. Find the sequence number.
v. What flags are set in the TCP header?
w. Find the TCP segment checksum.
x. Find the TCP window size.
y. What are the first 5 bytes of data
encapsulated inside the TCP segment?
2. (25 Points) Each router in the autonomous system shown below starts with a routing table showing the
networks that they are directly connected to. The routers exchange routing information using a
distance vector protocol. Show the messages that are exchanged and the state of the routing tables
after each message. Use the Routing Tables sheet(s).
CIS-331
Final Exam
Total of 120 Points
Spring 2016
Version 2
3. (20 Points) Consider a fixed subnet partition of the class B network 169.215.0.0. a. (5 Points) How many bits will be necessary to divide the network into 1015 subnets? b. (5 Points) What is the maximum number of hosts each subnet can have?
c. (5 Points) What is the subnet mask in dotted decimal notation?
d. (5 Points) Write the dotted decimal IP address of subnet 979 host 55. 4. (20 Points) Given the IP address 176.225.229.219 and the subnet mask of 255.255.252.0.
a. (10 Points) What is the network number? b. (5 Points) What is the subnet number?
c. (5 Points) What is the host number? 5. (10 Points) Explain Network Address Translation (NAT). What is it? Why do we need it? How does it work? Give examples. Draw diagrams. Be as specific as possible. 6. (10 Points) Explain how both the sender and the receiver control the flow over a TCP connection. Give
examples and be as specific as possible. 7. (10 Points) Explain how IPv6 handles fragmentation as it relates to datagrams. Where does it occur?
What is the minimum MTU in IPv6? When and where are the fragments reassembled? Give examples
and be as specific as possible. CIS-331
Final Exam
Total of 120 Points
Spring 2016
Version 2
This Page Is Intentionally Left Blank
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