CN-First Test

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 addreses 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

• 245.248.136.0/22 and 245.248.132.0/21

Which of the following is not true about Subnetting?

• It can be applied only for single network.

• It is used to improve security.

• Here, bits are borrowed from network ID portion.

• Here, bits are borrowed from host ID portion.

What is the network ID of the IP address 225.100.123.70?

• 225.100.123.71

• 225.100.123.72

• 225.100.123.75

• It does not has any network ID

How many bits are allocated for network id (NID) and host id(HID) in the IP address 25.193.155.233?

• 24 bit for NID, 8 bits for HID

• 8 bit for NID, 24 bits for HID

• 16 bit for NID, 16 bits for HID

• none

Consider Subnet mask of class B network on the internet is 255.255.240.0 then, what is the maximum number of hosts per subnets?

• 4098

• 4096

• 4094

• 4092

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.

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

• 2047

• 2046

An organization has a class B network and wishes to form subnets for 64 departments. The subnet mask would be:

• 255.255.252.0

• 255.255.128.0

• 255.255.64.0

• 255.255.0.0

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

Which of the following below is a loopback IP address?

• 127.0.0.0

• 127.0.0.1

• 127.0.1.1

• 127.0.1.0