Computer Networks Test 3

Question 1/10
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Consider a classless IP address 173.91.43.43/25. The number of IP addresses, first IP address, and the last IP address in 173.91.43.43/25 are ___ respectively?

A
128, 173.91.43.0 and  173.91.43.63

B
128, 173.91.43.0 and  173.91.43.127

C
126, 173.91.43.0 and  173.91.43.127

D
128, 173.91.43.1 and  173.91.43.63

Question 2/10
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If the size of header in an IPv4 is given as 50 bytes then how it represented in the IPv4’s header field?

A
1100

B
1101

C
1111

D
0011 0010

Question 3/10
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In a classful addressing schema, a host of Class B is split into 5-bit subnet number. If the Host Id is H bits and the maximum host per network is N then what is the value of H×N?

A
22506-22506

B
225064-225061

C
225067-225066

D
225069-225062

Question 4/10
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Internet protocol version 6 (IPv6) is the next-generation Internet Protocol version designated as the successor to IPv4 address space is being exhausted. Which one of the following address space is being exhausted. Which one of the following descriptions about IPv6 is correct?

A
Addresses are not hierarchical and are assigned at random.

B
Broadcast have been eliminated and replaced with multicasts.

C
There are 2.7 billion available addresses

D
An interface can only be configured with one IPv6 address.

Question 5/10
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Consider the following two statements with respect to IPv4 in computer networking:
P: The loopback(IP) address is a member of class B network
Q: The loopback(IP) address is used to send a packet from host to itself
What can you say about the statements P and Q?

A
P-True: Q-False

B
P-False; Q-True

C
P-True; Q-True

D
P-False; Q-false

Question 6/10
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Consider two systems S and R connected by routers serially, Let R0, R1, R2, R3 ... R6 be the intermediate routers connected serially between S and R where R0 is connected with S and R1 and R6 is connected with R and R5. If data is transferred from S to R with the time to live at S as (0001 0011)2 then what is the time to live at R in binary number system?
Note: Ignore leading 0's in the answer?

A
1011-1011

B
10114-10111

C
10117-10116

D
10119-10112

Question 7/10
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An Internet Service Provider (ISP) has the following chunk of CIDR-based IP addresses available with it: 176.129.160.0/21. The ISP wants to give half of this chunk of addresses to TESTBOOK, and a quarter to SCHOLARS, while retaining the remaining with itself.
Which of the following is valid allocation of addresses to TESTBOOK and SCHOLARS respectively?
I. 176.129.160.0/22 and 176.129.164.0/23
II. 176.129.160.0/22 and 176.129.166.0/23
III. 176.129.164.0/22 and 176.129.160.0/23
IV. 176.129.164.0/22 and 176.129.162.0/23

A
Only I and II

B
Only III and IV

C
I, II, III and IV

D
None of these

Question 8/10
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Consider Source S and Destination D are connected by an intermediate router R. Datagram of size 1160 byte is received by R. The maximum transmission unit is 200 bytes and the header size is 40 bytes. If the initial offset value is 1 then what is the offset value of the fifth fragment?

A
81-81

B
814-811

C
817-816

D
819-812

Question 9/10
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Consider three machines A, B, and C with IP addresses 200.175.168.1, 200.175.168.5, and 200.175.168.7 respectively. The subnet mask is set to 255.255.255.248 for all the three machines. Which one of the following is true?

A
A, B, and C all belong to the same subnet

B
A and B belong to the same subnet but not C

C
C and D belong to the same subnet but not A

D
A, B, and C belong to three different subnets

Question 10/10
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ICMP error message should NOT be sent after receiving:
(i). Another ICMP error message.
(ii). An IGMP message of any kind.
(iii). Any fragment other than the first fragment from a fragmented IP datagram.
(iv) A datagram for which fragmentation is required but DF bit is set in the IP header.
(v) A datagram with TTL exceeded.

A
(i),(ii) and (iii) only

B
(i) and (iii) only

C
(i) and (v) only

D
(iv) only

Question 1/10

128, 173.91.43.0 and ​173.91.43.63

128, 173.91.43.0 and 173.91.43.127

126, 173.91.43.0 and 173.91.43.127

128, 173.91.43.1 and ​173.91.43.63

Question 2/10

1100

1101

1111

0011 0010

Question 3/10

22506-22506

225064-225061

225067-225066

225069-225062

Question 4/10

Addresses are not hierarchical and are assigned at random.

Broadcast have been eliminated and replaced with multicasts.

There are 2.7 billion available addresses

An interface can only be configured with one IPv6 address.

Question 5/10

P-True: Q-False

P-False; Q-True

P-True; Q-True

P-False; Q-false

Question 6/10

1011-1011

10114-10111

10117-10116

10119-10112

Question 7/10

Only I and II

Only III and IV

I, II, III and IV

None of these

Question 8/10

81-81

814-811

817-816

819-812

Question 9/10

A, B, and C all belong to the same subnet

A and B belong to the same subnet but not C

C and D belong to the same subnet but not A

A, B, and C belong to three different subnets

Question 10/10

(i),(ii) and (iii) only

(i) and (iii) only

(i) and (v) only

(iv) only

128, 173.91.43.0 and 173.91.43.63

128, 173.91.43.1 and 173.91.43.63