Exam-style question
Try this first
An IP address is 172.16.45.9 and its subnet mask is 255.255.0.0. Which is the network identifier?.
- A.172.16.45.0
- B.172.0.0.0
- C.172.16.0.0
- D.255.255.0.0
Model answer
What a good answer should say
- 172.16.0.0
Explanation
Why this works
The first two octets are identified as the network part by the mask. The remaining octets are set to zero when writing the network identifier.
Common mistake
No common mistake is linked to this question yet.