A$.$ Your ISP has purchased the IP address range $99\mathrm{.}5\mathrm{.}255\mathrm{.}0/18.$ Now answer the following: $($show your

calculations$)$

$1.$ What is the network address assigned to your ISP?

$2.$ What will be the broadcast address used by your ISP?

$3.$ What is the maximum number of clients the ISP can sell their connections to$?$

$4.$ What is the first usable IP address?

$5.$ What is the last usable IP address?

B$.$ Your company is using the IP address range $172\mathrm{.}20\mathrm{.}0\mathrm{.}0/22.$ The company has five departments with

the following number of hosts for each department: $($show your calculations$)$

Accounting $-28$ hosts

Marketing $-60$ hosts

HR $-2$ hosts

Support $-120$ hosts

Quality Assurance $-10$ hosts

Subnet the network in such a way so that less number of IP addresses are wasted and answer the

following for each subnet, use CIDR notation:

$1.$ What is the network address?

$2.$ What is the broadcast address?

$3.$ How many hosts are possible?

$4.$ What is the first usable IP address?

$5.$ What is the last usable IP address?

C$.$ The IP address for a computer is $203\mathrm{.}120\mathrm{.}45\mathrm{.}23,$ and the subnet mask used in the network is

$255\mathrm{.}255\mathrm{.}255\mathrm{.}192.$ Represent this information in CIDR format $($I mean a$.$b$.$c$.$d$/$n format$).($show your

calculations$)$

D$.$ The IP address for Device$-$A is $172\mathrm{.}255\mathrm{.}17\mathrm{.}30/21,$ and Device$-$B is $172\mathrm{.}255\mathrm{.}31\mathrm{.}30/21.$ Are these

devices on the same subnet or on different subnets? How do you know $($show your calculations$)?$

What is the subnet address for each device $($show your calculations$)?$