IP Addressing

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Question 1

An Internet Service Provider (ISP) has the following chunk of CIDR-based IP addresses available with it: 245.248.128.0/20. The ISP wants to give half of this chunk of addresses to Organization A, and a quarter to Organization B, while retaining the remaining with itself. Which of the following is a valid allocation of addresses to A and B?

  • 245.248.136.0/21 and 245.248.128.0/22

  • 245.248.128.0/21 and 245.248.128.0/22

  • 245.248.132.0/22 and 245.248.132.0/21

  • 245.248.136.0/24 and 245.248.132.0/21

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Question 2

Suppose computers A and B have IP addresses 10.105.1.113 and 10.105.1.91 respectively and they both use the same netmask N. Which of the values of N given below should not be used if A and B should belong to the same network?

  • 255.255.255.0

  • 255.255.255.128

  • 255.255.255.192

  • 255.255.255.224

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Question 3

Host X has IP address 192.168.1.97 and is connected through two routers R1 and R2 to an­other host Y with IP address 192.168.1.80. Router R1 has IP addresses 192.168.1.135 and 192.168.1.110. R2 has IP addresses 192.168.1.67 and 192.168.1.155. The netmask used in the network is 255.255.255.224. 


Given the information above, how many distinct subnets are guaranteed to already exist in the network?
 

  • 6
     

  • 3
     

  • 2
     

  • 1
     

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Question 4

Which of the following statements are true ? (a) The fragmentation fields in the base header section of IPv4 have moved to the fragmentation extension header in IPv6. (b) The authentication extension header is new in IPv6. (c) The record route option is not implemented in IPv6.
  • (a) and (b) Only
  • (b) and (c) Only
  • (a) and (c) Only
  • (a), (b) and (c)
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Question 5

If a class B network on the Internet has a subnet mask of 255.255.248.0, what is the maximum number of hosts per subnet?

  • 1022

  • 1023

  • 2046

  • 2047

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Question 6

The address of a class B host is to be split into subnets with a 6-bit subnet number. What is the maximum number of subnets and the maximum number of hosts in each subnet?

  • 62 subnets and 262142 hosts.

  • 64 subnets and 262142 hosts.

  • 62 subnets and 1022 hosts.

  • 64 subnets and 1024 hosts.

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Question 7

The subnet mask for a particular network is 255.255.31.0. Which of the following pairs of IP addresses could belong to this network?

  • 172.57.88.62 and 172.56.87.233

  • 10.35.28.2 and 10.35.29.4

  • 191.203.31.87 and 191.234.31.88

  • 128.8.129.43 and 128.8.161.55

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Question 8

Consider the following routing table at an IP router 

 

For each IP address in Group-I identify the correct choice of the next hop from Group-II using the entries from the routing table above.

   List-I               List-II
A. 128.96.171.92     1. Interface 0
B. 128.96.167.151    2. Interface 1
C. 128.96.163.121    3. R2
D. 128.96.165.121    4. R3
                     5. R4
Codes:
     A B C D
(a)  1 3 5 4
(b)  1 4 2 5
(c)  2 3 4 5
(d)  2 3 5 4

  • a

  • b

  • c

  • d

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Question 9

The broadcast address for IP network 172.16.0.0 with subnet mask 255.255.0.0 is

  • 172.16.0.255

  • 172.16.255.255

  • 255.255.255.255

  • 172.255.255.255

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Question 10

How many bits internet address is assigned to each host on a TCP/IP internet which is used in all communication with the host?

  • 16 bits

  • 32 bits

  • 48 bits

  • 64 bits

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