IP Addressing

Question 21

In a class B subnet, we know the IP address of one host and the mask as given below:

IP address: 125.134.112.66
Mask: 255.255.224.0

What is the first address(Network address)?

• 125.134.96.0
• 125.134.112.0
• 125.134.112.66
• 125.134.0.0

Question 22

In a classful addressing, the IP addresses with 0 (zero) as network number :

• refers to the current network
• refers to broadcast on the local network
• refers to broadcast on a distant network
• refers to loopback testing

Question 23

Which of the following is/are restriction(s) in classless addressing?

• The number of addresses needs to be a power of 2.
• The mask needs to be included in the address to define the block.
• The starting address must be divisible by the number of addresses in the block.
• All of the above

Question 24

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

Question 25

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 172.56.87.23
• 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

Question 26

The subnet mask 255.255.255.192

• extends the network portion to 16 bits
• extends the network portion to 26 bits
• extends the network portion to 36 bits
• has no effect on the network portion of an IP address

Question 27

Which are the two modes of IP security?

• Transport and certificate

• Transport and tunnel

• Certificate and tunnel

• Preshared and transport

Question 28

In a classful addressing, first four bits in Class A IP address is

• 1010
• 1100
• 1011
• 1110
• (A) , (B), (C) and (D) are wrong.

Question 29

Consider the following statements about the functionality of an IP based router.

• I. A router does not modify the IP packets during forwarding.
• II. It is not necessary for a router to implement any routing protocol.
• III. A router should reassemble IP fragments if the MTU of the outgoing link is larger than the size of the incoming IP packet.

Which of the above statements is/are TRUE ?

• I and II only
• I only
• II and III only
• II only

Question 30

An organization requires a range of IP address to assign one to each of its 1500 computers. The organization has approached an Internet Service Provider (ISP) for this task. The ISP uses CIDR and serves the requests from the available IP address space 202.61.0.0/17. The ISP wants to assign an address space to the organization which will minimize the number of routing entries in the ISP’s router using route aggregation. Which of the following address spaces are potential candidates from which the ISP can allot any one of the organization ?

I. 202.61.84.0 / 21
II. 202.61.104.0 / 21
III. 202.61.64.0 / 21
IV. 202.61.144.0 / 21 

• I and II only
• II and III only
• III and IV only
• I and IV only