Applied Test Series

Question

For the given network address 178.100.0.0 we need the 2000 subnets and 15 usable hosts then what will be the subnet mask for this allotment ?

 

Answer 1

For a class B network we have,

14 bits for net id and 16 bits for host id part.

Now for 2000 subnets we need 11 bits from host id part

Therefore the subnet mask = 255.255.255.224

Answer 2

ANSWER : SUBNET MASK IS 255.255.255.224

CAUSE 11 BIT REQUIRED FOR SUBNET ID TO CREATE - 2000 SUBNET

AND THERE IS 15 USABLE HOST IP ADDRESS +2 IP ADDRESS REQUIRE IN SUBNET (FOR SUBNET ID AND DBA)

SO FOR TOTAL 17 IP ADDRESS ,WE REQUIRE 5 BIT HID .

TOTAL 16 BIT = 11+5 ARE USED 

FROM THAT 11 BIT IS SID AND ALREADY 16 BIT NID TOTAL 27 BIT ARE USEFUL FOR MASK