NCTI Field Tech III to IV Practice Exam

To convert the IP address 172.68.10.2 from decimal to binary, each of the four decimal octets must be converted individually into an 8-bit binary format.

1. The first octet is 172. In binary, 172 is represented as:

- 172 divided by 128 (2^7) gives 1 (the highest bit).

- 172 - 128 = 44, so:

- 44 divided by 64 (2^6) gives 0.

- 44 divided by 32 (2^5) gives 1 (the next bit).

- 44 - 32 = 12.

- 12 divided by 16 (2^4) gives 0.

- 12 divided by 8 (2^3) gives 1 (the next bit).

- 12 - 8 = 4.

- 4 divided by 4 (2^2) gives 1 (the next bit).

- 4 - 4 = 0.

Therefore, 172 in binary is 10101100.

2. The second octet is 68. Its binary conversion works out as: