200-101 · Question #120
The network technician is planning to use the 255.255.255.224 subnet mask on the network. Which three valid IP addresses can the technician use for the hosts? (Choose three.)
The correct answer is B. 172.22.243.190 E. 10.17.64.34 F. 10.16.33.98. With a /27 mask (255.255.255.224), subnets increment in blocks of 32; valid host addresses exclude the network address (first in block) and broadcast address (last in block).
Question
Exhibit
Options
- A172.22.243.127
- B172.22.243.190
- C172.22.243.191
- D192.168.1.160
- E10.17.64.34
- F10.16.33.98
How the community answered
(29 responses)- A3% (1)
- B83% (24)
- C3% (1)
- D10% (3)
Why each option
With a /27 mask (255.255.255.224), subnets increment in blocks of 32; valid host addresses exclude the network address (first in block) and broadcast address (last in block).
172.22.243.127 is the broadcast address of the 172.22.243.96/27 subnet (block .96 to .127) and cannot be assigned to a host.
172.22.243.190 falls in the 172.22.243.160/27 subnet (range .160 to .191) and is neither the network address (.160) nor the broadcast address (.191), making it a valid host.
172.22.243.191 is the broadcast address of the 172.22.243.160/27 subnet (block .160 to .191) and cannot be assigned to a host.
192.168.1.160 is the network address of the 192.168.1.160/27 subnet and cannot be assigned to a host.
10.17.64.34 falls in the 10.17.64.32/27 subnet (range .32 to .63) and is neither the network address (.32) nor the broadcast address (.63), making it a valid host.
10.16.33.98 falls in the 10.16.33.96/27 subnet (range .96 to .127) and is neither the network address (.96) nor the broadcast address (.127), making it a valid host.
Concept tested: Subnet host address validation with /27 mask
Source: https://www.cisco.com/c/en/us/support/docs/ip/ip-addressing/13788-1.html
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