Microsoft Networking Essentials Exam IP Addressing & Subnetting 2

Question 1

Given the IP address 172.16.50.100/20, what is the network address?

Accepted Answer

172.16.48.0

Answer

With a /20 mask, the third octet block size is 16; 50 falls in the 48–63 block, so the network address is 172.16.48.0.

Question 2

What is the broadcast address of the subnet 192.168.10.64/26?

Accepted Answer

192.168.10.127

Answer

A /26 has a block size of 64; the 64 subnet spans .64–.127, so the broadcast address is 192.168.10.127.

Question 3

Which subnet mask allows the most hosts per subnet when applied to a Class C network?

Accepted Answer

255.255.255.128

Answer

255.255.255.128 (/25) leaves 7 host bits, providing 126 usable hosts — the most among the options listed.

Question 4

How many subnets does a /28 mask create from a Class C network?

Accepted Answer

16

Answer

A /28 borrows 4 bits from a Class C (/24) network, creating 2^4 = 16 subnets.

Question 5

Which of the following IPv4 addresses is a Class A private address?

Accepted Answer

10.200.50.1

Answer

RFC 1918 defines 10.0.0.0/8 as the Class A private range; 10.200.50.1 falls within it.

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