Q$1)172\mathrm{.}16\mathrm{.}4\mathrm{.}120/25$

a$)$ Is it public or private ip address?

b$)$ Is it a valid host or Net ID$?$

c$)$ What is the block size? $128$

d$)$ What is the NID?

e$)$ What is the subnet$-$mask for this host?

f$)$ What is the broadcast address for this host?