JN0-102 · Question #376
What is the network ID address of the IPv4 subnet that includes the IP address 114.180.192.120/28?
The correct answer is C. 114.180.192.112/28. To determine the network ID for 114.180.192.120/28, you must identify the subnet mask and calculate the network address by performing a bitwise AND operation with the given IP.
Question
What is the network ID address of the IPv4 subnet that includes the IP address 114.180.192.120/28?
Options
- A114.180.192.118/28
- B114.180.192.100/28
- C114.180.192.112/28
- D114.180.192.106/28
How the community answered
(23 responses)- A4% (1)
- B9% (2)
- C70% (16)
- D17% (4)
Why each option
To determine the network ID for 114.180.192.120/28, you must identify the subnet mask and calculate the network address by performing a bitwise AND operation with the given IP.
114.180.192.118/28 is a host address within the 112-127 subnet, not the network ID.
114.180.192.100/28 falls into a different subnet (the 96-111 range) based on the /28 mask.
A /28 subnet mask means 28 network bits, or 255.255.255.240. For the last octet, converting 120 to binary (01111000) and 240 to binary (11110000) and performing a bitwise AND yields 01110000, which is 112 in decimal. Thus, the network ID is 114.180.192.112/28.
114.180.192.106/28 also falls into a different subnet (the 96-111 range) based on the /28 mask.
Concept tested: IPv4 subnetting calculation
Source: https://www.cisco.com/c/en/us/support/docs/ip/ip-version-4-ipv4/13795-27.html
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