Computer Networks MCQ - Computer Networks Section 3

16 A company has a class C network address of 204.204.204.0. It wishes to have three subnets, one with 100 hosts and two with 50 hosts each. Which one of the following options represents a feasible set of subnet address/subnet mask pairs?

MSB in last 8 bits helps us to get two subnets
10000000 ⟶ subnet1
00000000 ⟶subnet2
subnet2 is divided into 2 more subnets using 7th bit
00000000 ⟶ subnet2(0)
01000000 ⟶ subnet2(1)

17 A router uses the following routing table:

A packet bearing a destination address 144.16.68.117 arrives at the router. On which interface will it be forwarded?

Subnet address of interface = 144. 16 . 68 .0
Subnet address of incoming IP
= 144. 16. 68. 117 BITWISE AND 255.255.255.0
= 144. 16. 68.0
Both subnetwork addresses are same, so packet is forwarded to interface eth2

18 A subnetted Class B network has the following broadcast address : 144.16.95.255. Its subnet mask

For broadcast address of a subnet, all the host bits are set to 1.
Broadcast address for subnet is
.95.255 ---> .0101 1111. 1111 1111
So, Possible host bits can be 13 to 0
Hence could be any one of 255.255.224.0, 255.255.240.0, 255.255.248.0

19 Two computers C1 and C2 are configured as follows. C1 has I P address 203. 197.2.53 and net mask 255.255.128.0. C2 has I P address 203.197.75.201 and netmask 255.255.192.0. Which one of the following statements is true?

The two computer C1 and C2 are configured as follows :

20 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?

Maximum number of subnets
= 2⁶ - 2 = 62
Maximum number of host in each subnet
= 2¹⁰ – 2 = 1022