Question

A supernet has a first address of 205.16.32.0 and a supernet mask of 255.255.248.0. A router receives four packets with the following destination addresses. Which packet belongs to this supernet? 
1. 205.16.42.56
2. 205.17.32.76
3. 205.16.31.10
4. 205.16.39.44

Answer 1

Correct Answer - Option 4 : 205.16.39.44

Answer: Option 4

Explanation:

Given first address: 205.16.32.0 

Supernet mask: 255.255.248.0

Option 1: 205.16.42.56

performing bitwise and operation with supernet mask

11001101.00010000.00101010.00111000

11111111 .11111111 . 11111000 .00000000

-----------------------------------------------------------

11001101.00010000.00101000. 00000000

≡ 205.16.40.0 ≠  205.16.32.0 

Hence this is not the correct Option.

Option 2: 205.17.32.76

performing bitwise and operation with supernet mask

11001101.00010001.00100000.01001100

11111111 .11111111 . 11111000 .00000000

-----------------------------------------------------------

11001101.00010001.00100000. 00000000

≡ 205.17.32.0 ≠ 205.16.32.0

Hence this is not the correct Option.

Option 3: 205.16.31.10

performing bitwise and operation with supernet mask

11001101.00010000.00011111.00001010

11111111 .11111111 . 11111000 .00000000

-----------------------------------------------------------

11001101.00010000.00011000. 00000000

≡ 205.16.24.0 ≠ 205.16.32.0

Hence this is not the correct Option.

Option 4: 205.16.39.44

performing bitwise and operation with supernet mask

11001101.00010000.00100111.00101100

11111111 .11111111 . 11111000 .00000000

-----------------------------------------------------------

11001101.00010000.00010000. 00000000

≡ 205.16.32.0 == 205.16.32.0

Hence this is the correct Option.