Find the subnet containing 192.0.2.77/27.
Give the network address in CIDR notation.
Which subnet contains the address?
A /27 divides the last octet into blocks of 32. 77 lies in the 64–95 block, so the network is 192.0.2.64/27.
Detailed explanation
192.0.2.0/27Incorrect. 192.0.2.0/27 covers only 0–31.
Incorrect. 192.0.2.0/27 covers only 0–31.
192.0.2.32/27Incorrect. 192.0.2.32/27 covers 32–63.
Incorrect. 192.0.2.32/27 covers 32–63.
192.0.2.64/27Correct. 192.0.2.64/27 covers 64–95, including 77.
Correct. 192.0.2.64/27 covers 64–95, including 77.
192.0.2.96/27Incorrect. 192.0.2.96/27 starts above 77.
Incorrect. 192.0.2.96/27 starts above 77.
Try it yourself
An example you can run in a temporary verification environment.
python3 -c "import ipaddress; print(ipaddress.ip_interface('192.0.2.77/27').network)"Expected result
192.0.2.64/27Key points
- A /27 uses blocks of 32
- Boundaries are 0, 32, 64, and 96
- 77 lies between 64 and 95
Notes
- Environment: Python 3 ipaddress / ローカル計算のみ
- Command output formatting can vary slightly by distribution or tool version.
- Run the example in a temporary directory or process when possible.
Foundation review
Read the scope first
Check whether the command acts on the current shell, a new process, an existing process, or a file.
Verify the observable result
Use the supplied command and compare the output with the expected result.