In the network 200.10.11.144/27, the fourth octet (in decimal) of the last IP…
2015
In the network 200.10.11.144/27, the fourth octet (in decimal) of the last IP address of the network which can be assigned to a host is ____________
Attempted by 110 students.
Show answer & explanation
Correct answer: 158
Key idea: for a /27 prefix the subnet size in the last octet is 32 (mask 255.255.255.224).
Find the subnet start: take the largest multiple of 32 that is ≤ 144, which is 128. So the network is 200.10.11.128.
Find the broadcast address: network + 31 = 159, so broadcast is 200.10.11.159.
Last usable host = broadcast − 1 = 158 (200.10.11.158).
Answer: 158
A video solution is available for this question — log in and enroll to watch it.