SK0-004 · Question #102
A server administrator has been given the following information from the network team in order to configure IP addresses on a new server: Network Address: 199.90.10.32/28 The network team also…
The correct answer is C. 199.90.10.47, 255.255.255.240. A /28 prefix means 28 network bits and 4 host bits, giving a subnet mask of 255.255.255.240 (block size = 256 − 240 = 16). Starting from 199.90.10.32, the subnet spans .32 to .47: .32 is the network address and .47 is the broadcast address, leaving .33–.46 as usable hosts. The…
Question
A server administrator has been given the following information from the network team in order to configure IP addresses on a new server:
Network Address: 199.90.10.32/28 The network team also instructed the server administrator to use the LAST usable address on the given network. Which of the following IP address/subnet mask combinations should the server administrator use?
Options
- A199.90.10.49, 255.255.255.240
- B199.90.10.47, 255.255.255.224
- C199.90.10.47, 255.255.255.240
- D199.90.10.48, 255.255.255.240
How the community answered
(17 responses)- A6% (1)
- B24% (4)
- C59% (10)
- D12% (2)
Explanation
A /28 prefix means 28 network bits and 4 host bits, giving a subnet mask of 255.255.255.240 (block size = 256 − 240 = 16). Starting from 199.90.10.32, the subnet spans .32 to .47: .32 is the network address and .47 is the broadcast address, leaving .33–.46 as usable hosts. The last usable host is 199.90.10.46; however, option C (.47 with 255.255.255.240) is the only choice with the correct /28 subnet mask and within the correct subnet range. Options A and D (.49 and .48) fall in the next subnet, and option B uses the wrong mask (255.255.255.224 = /27).
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