Suppose computers A and B have IP addresses 10.105.1.113 and 10.105.1.91…
2010
Suppose computers A and B have IP addresses 10.105.1.113 and 10.105.1.91 respectively and they both use the same net mask N. Which of the values of N given below should not be used if A and B should belong to the same network?
- A.
255.255.255.0
- B.
255.255.255.128
- C.
255.255.255.192
- D.
255.255.255.224
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Correct answer: D
Correct. With mask 255.255.255.224 (/27) subnets are 32-address blocks: 0–31,32–63,64–95,96–127,... The addresses 91 and 113 fall into different /27 subnets: 91 is in 64–95 while 113 is in 96–127 — so this mask would place A and B on different networks.
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