Microsoft Networking Essentials Exam IP Addressing & Subnetting 2 — Questions and Answers
Question 1: Given the IP address 172.16.50.100/20, what is the network address?
- 172.16.48.0 (Correct answer)
- 172.16.50.0
- 172.16.32.0
- 172.16.64.0
Correct answer: 172.16.48.0
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?
- 192.168.10.95
- 192.168.10.127 (Correct answer)
- 192.168.10.128
- 192.168.10.255
Correct answer: 192.168.10.127
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?
- 255.255.255.128 (Correct answer)
- 255.255.255.192
- 255.255.255.224
- 255.255.255.240
Correct answer: 255.255.255.128
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?
- 4
- 8
- 16 (Correct answer)
- 32
Correct answer: 16
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?
- 10.200.50.1 (Correct answer)
- 172.32.0.1
- 192.169.0.1
- 169.254.1.1
Correct answer: 10.200.50.1
RFC 1918 defines 10.0.0.0/8 as the Class A private range; 10.200.50.1 falls within it.
Question 6: What does CIDR stand for in networking?
- Classless Inter-Domain Routing (Correct answer)
- Common Internet Data Relay
- Centralized IP Data Routing
- Class-Independent Data Routing
Correct answer: Classless Inter-Domain Routing
CIDR stands for Classless Inter-Domain Routing and allows flexible allocation of IP address blocks using prefix notation.
Question 7: Which protocol automatically assigns IP addresses to hosts on a network?
- ARP
- DNS
- DHCP (Correct answer)
- ICMP
Correct answer: DHCP
DHCP (Dynamic Host Configuration Protocol) automatically assigns IP addresses, subnet masks, gateways, and DNS info to clients.
Microsoft Networking Essentials Exam IP Addressing & Subnetting 2
Given the IP address 172.16.50.100/20, what is the network address?