Question

your company has been given the ip address of 199.2.1.0/24 to the subnet. You plan to put each of the 9 floorsin your building on its own subnet. what is the ip range of the last available network once your subnet?

Answer 1

Answer:

The correct answer is 254

Explanation:

        Subnet  is a logical partition of an IP address network into multiple  smaller network segments.    

IP address : Internet protocol address is  a unique identifier for every machine using the internet.

199.2.1.0/24.  the part /24  means prefix length. It represents the number of consecutive 1's in the subnet mask.  

Answer 2

The IP range of the last available network once I subnet is : 199.2.1.224 - 199.2.1.255

The IP address of my company is given as 199.2.1.0/24

The IP address 199.2.1.0/24 needs $5$ networks.

$128 \ \ 64 \ \ 32 \ \ 16 \ \ 8 \ \ 4 \ \ 2 \ \ 1$

$0 \ \ 0 \ \ 0 \ \ 0 \ \ 0 \ \ 0 \ \ 1 \ \ 0 \ \ 1$ = $5$ in binary

Now we need to borrow $3$ bits for the # of networks.

The new Subnet Mask = $255.255.255.11100000 (224)$ $\text{or}\ /27$

Increment = $32$

$2^3$ $= #$ # of networks = $8$

$2^5 - 2$ = # of hosts per network = $30$

All the 8 IP ranges are :

$199.2.1.0 - 199.2.1.31$

$199.2.1.32 - 199.2.1.63$

$199.2.1.64 - 199.2.1.95$

$199.2.1.96- 199.2.1.127$

$199.2.1.128 - 1.159$

$199.2.1.160 - 199.2.1.191$

$199.2.1.192 -199.2.1.223$

$199.2.1.224 - 199.2.1.255$

Hence the IP range of the last available network is 199.2.1.224 - 199.2.1.255

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