Network Layer- Subnetting Question or MCQ-8

Q.8 How Many Host will be available for 172.16.8.2/29 and also find Correct Subnet Mask ?

(a) 8 Host & 255.255.255.252

(b) 6 Host & 255.255.255.248

(c) 6 Host & 255.255.255.254

(d) 8 Host & 255.255.248.255

Answer :- (b)

Explanation

CIDR 29 Means 29 Network bit will one and 3 Host bit will be Zero
so Correct mask is
Binary Representation
11111111.11111111.11111111.11111000
Decimal Representation
255.255.255.248

Total Subnets 2⁵=32

Maximum number of Hosts in every subnet is 2³=8

Usable host 8-2=6 (i.e. First and Last Host will be reserved for Network id and Broad Cast Address)

Correct Answer b Available Host will be 6 and Subnet Mask would be 255.255.255.248