CompTIA Network+ Practice Questions: IP Addressing

7 free, exam-style CompTIA Network+ (N10-009) practice questions covering IP Addressing. Each question shows the correct answer and a clear explanation. Ready for the real thing? Take the full timed quiz below.

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Q1. What is the purpose of a subnet mask?

A.To identify the network portion of an IP address✓ Correct
B.To encrypt network traffic
C.To assign MAC addresses
D.To measure network latency

Explanation: A subnet mask divides an IP address into the network and host portions. It determines which part of the address represents the network and which part represents individual devices (hosts), enabling routing and IP management. Learn more.

Q2. Which protocol resolves IP addresses to MAC addresses?

A.DNS
B.DHCP
C.ARP✓ Correct
D.RARP

Explanation: ARP (Address Resolution Protocol) maps IP addresses to MAC addresses, enabling devices to communicate on a local network. It operates at Layer 2 and is essential for packet delivery in Ethernet environments. Learn more.

Q3. Which of the following IP addresses is a private, non-routable IP address according to RFC 1918?

A.172.32.10.5
B.192.168.1.100✓ Correct
C.11.0.0.1
D.169.254.10.20

Explanation: The 192.168.0.0/16 block is designated for private use. 172.32.x.x is public (private is 172.16.0.0 - 172.31.255.255). 11.x.x.x is public. 169.254.x.x is APIPA. Learn more.

Q4. What is the primary function of NAT (Network Address Translation)?

A.To encrypt data transmitted over the internet.
B.To translate private IP addresses to public IP addresses.✓ Correct
C.To assign MAC addresses to network devices.
D.To filter malicious network traffic.

Explanation: NAT allows multiple devices on a private network using private IP addresses (RFC 1918) to share a single public IP address for internet access. This conserves public IP addresses and provides a degree of security by hiding internal network structures. Learn more.

Q5. Which IPv6 address type is intended for one-to-nearest delivery among multiple nodes sharing the same address?

A.Anycast✓ Correct
B.Broadcast
C.Loopback only
D.APIPA

Explanation: IPv6 anycast addresses are assigned to multiple interfaces, and routing delivers traffic to the nearest one. Learn more.

Q6. Which IPv6 multicast address is used for all nodes on the local link?

A.ff02::1✓ Correct
B.::1
C.fe80::1
D.2001:db8::1

Explanation: ff02::1 is the IPv6 all-nodes link-local multicast address. Learn more.

Q7. A network uses 10.0.0.0/8 internally. What address type is this?

A.Private IPv4✓ Correct
B.Public IPv4
C.Loopback IPv4
D.Multicast IPv4

Explanation: 10.0.0.0/8 is an RFC 1918 private IPv4 address range. Learn more.