You have a class B network with a 255.255.255.0 mask. Which of the statements below are true of this network? (Select all valid answers)
A. There are 254 usable subnets. B. There are 256 usable hosts per subnet. C. There are 50 usable subnets. D. There are 254 usable hosts per subnet. E. There are 24 usable hosts per subnet. F. There is one usable network.
Answer: A, D
I don't think A is right,because i think there are 256 usable subnets
ha scritto nel messaggio news: snipped-for-privacy@e16g2000pri.googlegroups.com...
Hi,
A is correct if you don't use the first and last subnet (very very old thing) If you also use the first and last subnet (default nowadays) there are 256 subnets.
Regards, Gabriele
Yes, as the previous poster stated this is an extremely old way of determining the number of subnets. Good training materials in recent years stated things such as "assume the command ip subnet zero has been issued", or very clearly that you were to calculate the number of "ususable subnets, as opposed to the total number of subnets".
However, the concept of "useable" v. "total" subnets has now been dropped from all new (2007) Cisco branded training material and certs. If you are using training resources that include questions with the above answers it is now out of date and should discarded.
Aubrey
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