1. An ISP is granted the block 16.12.64.0/20.

The ISP needs to allocate addresses for 3 organizations.

First Organization with 800 addresses, second with 400 addresses, and the

third with 90 addresses.

SHOW ALL WORK AND FILL IN THE TABLE. ALL WORK MUST BE

SHOWN FOR FULL CREDIT.

a. Write the /20 Mask using dotted decimal notation.

b. Write NOT of /20 mask using dotted decimal notation.

c. Find the total number of available addresses in the entire ISP block.

d. Find the first and last address of the entire 16.12.64.0/20 block.

e. Find the range of addresses for each organization. (Another

wordsdesign 3 subnets and list the first and last address in EACH of the

three subnets as was done in class).

f. How many addresses are NOT allocated? (Another wordshow many

addresses are not used from the total available addresses?)

g. How many HOSTS can be attached to EACH subnet

Question	Answer
1a.
1b.
1c.
1d.	FA: LA:
1e. Subnet 1 First and Last address with correct mask	FA: LA:
1e. Subnet 2 First and Last address with correct mask	FA: LA:
1e. Subnet 3 first and last address with correct mask	FA: LA:
1f.
1g.

FA = First Address

LA = Last Address