computer network

What is the first address of a block of classless addresses if one of the addresses is 17.12.14.50/28?

a. 17.12.14.48/28

b. 17.12.14.49/28

c. 17.12.14.62/28

d. 17.12.14.63/28

What is the last address of a block of classless addresses if one of the addresses is 17.12.14.2/27?

a.17.12.14.1/27

b.17.12.14.30/27

c.17.12.14.31/27

d.17.12.14.0/27

In the Go-Back-N Protocol, if the size of the sequence number field is 8, the sequence numbers are in ________ arithmetic,

Select one:

a.modulo-8

b.modulo-256

c.modulo-2

d.modulo-16