Valid host range for subnet on IP address - Networking

Q.  Networking: Which of the following is the valid host range for the subnet on which the IP address 192.168.168.188 255.255.255.192 resides?
- Published on 24 Jun 15

a. 21. 192.168.168.129-190
b. 21. 192.168.168.129-191
c. 21. 192.168.168.128-190
d. 21. 192.168.168.128-192

ANSWER: 21. 192.168.168.129-190
 
Subnet is a logical, visible subdivision of an IP network. The computers which belong to a subnet are addressed with a common, identical and most-significant bit-group in their IP address.

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