Organisation S Storting Add Starting Add Ending Add Adds allocated Mask a. If a

Question

Organisation S Storting Add Starting Add Ending Add Adds allocated Mask a. If a class B network uses a subnet mask 255.255.240.0, how many subnets are allowed? b. A large number of consecutive IP addresses are available starting at 128.16.0.0. Suppose that four organizations A,B,C and D request 2000, 1000, 2000, and 4000 addresses respectively, andin that order. For each of these, use the table above to give the first IP address assigned, the last IP address assigned, and the mask in the w. x. y. z /s notation and not /s. Include all O's and all 1's in your allocation.

Explanation / Answer

Given starting address: 128.16.0.0

subnet mask : 255.255.240.0

it becomes 128.16.0.0/20

Step 1: Sort the requirements of IPs in descending order (Highest to Lowest).

Organization D 4000

Organization A 4000

Organization C 2000

Organization B 1000

Step 2:Make a list of Subnets possible.

255.255.254.0/23

Step 3:

Allocate the highest range of IPs to the highest requirement. So assign 4000 IPs to organization D with network address 128.16.0.0/20

Then allocate 2000 IPs to org A(128.16.16.0/21) and Org C(128.16.24.0/21)

and last assign 1000 IPs to org B(128.16.32.0/22).

Table

slash Notation Host/subnet 255.255.240.0/20 4094 255.255./248.0/21 2046 255.255.252.0/22 1022

255.255.254.0/23

510 255.255.255.0/24 254

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