Question

Using the technique of bitwise ANDing, find the IP address of the network # (this could be a network or subnet) on which the machine with an IP address and (sub)netmask of 175.99.138.0/21 resides. (Do not include any spaces in your answer.)

Answer 1

Answer:

175.99.136.0

Explanation:

175.99.138.0/21

Step 1: convert both the ip and the subnet mask to binary format

175.99.138.0 - 10101111.1100011.10001010.00000000

/21  : 255.255.248.0 - 11111111.11111111.11111000.00000000

step 2: perform the bitwise AND operation

In an AND operation,  a result of 1  can only be gotten when both inputs are 1. Otherwise, the result will be 0.

10101111.1100011.10001010.00000000

11111111.   11111111.  11111000. 00000000

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10101111. 1100011. 10001000. 00000000

step 3: convert the binary result back to base 10 number

10101111. 1100011. 10001000. 00000000

175.99.136.0