Anetwork address of 172.16.0.0 /12 has been given. which of the following accurately describes this network? (select one or more)
(a) the ending address of this network is 172.255.255.255
(b) the ending address of this network is 172.31.255.255
(c) this is private class a network with 4 bits of sub-netting
(d) this is not a valid network address because the 255.240.0.0 mask is wrong
(e) this is private class b network using a default mask

B and E is correct.

Explanation:

Given that network address

172.16.0.0/12

This is class B network type.

The ending of this network will be 172.31.255.255

In IP version 4 there are four following type of classes

1)Class A (0-127)

2)Class B (128-191)

3)Class C (191-223)

4)Class D(224-239)

5)Class E (240-255)

Generally class A,B,C and D are used.

So our options B and E is correct.

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hope this is what you're talking about