Computer Networking
You have a class A network address 10.0.0.0 with 40 subnets, but are required to add 60 new subnets very soon. You would like to still allow for the largest possible number of host IDs per subnet. Which subnet mask should you assign?

255.252.0.0
255.240.0.0
255.254.0.0
255.248.0.0
255.255.255.255

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Computer Networking
X.21 is

network access standard for connecting stations to a circuit-switched network
a method access control technique for multiple-access transmission media
None of these
a very common bit-oriented data link protocol issued by ISO
a method of determining which device has access to the transmission medium at any time

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