N10-009 — CompTIA Network+
CompTIA

CompTIA Network+ (N10-009) Practice Questions

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100 questions
2026-06-12 updated
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Domain coverage

  • Networking Concepts (23%)
  • Network Implementation (20%)
  • Network Operations (19%)
  • Network Security (14%)
  • Network Troubleshooting (24%)

Sample Questions (10 of 100 shown)

Q1 Networking Fundamentals
Which OSI model layer is responsible for logical addressing and routing packets between networks?
  1. Data Link layer
  2. Network layer
  3. Transport layer
  4. Session layer
✓ Correct Answer: B
The Network layer (Layer 3) handles logical addressing (IP addresses) and determines the best path for data across networks. Routers operate at this layer, forwarding packets based on IP addresses.
Q2 Networking Fundamentals
A network administrator needs to allow only HTTPS traffic into the network while blocking all other inbound connections. Which TCP port must be allowed?
  1. Port 80
  2. Port 443
  3. Port 8080
  4. Port 8443
✓ Correct Answer: B
HTTPS (HTTP Secure) uses TCP port 443. Port 80 is used for unencrypted HTTP traffic. Ports 8080 and 8443 are common alternative HTTP/HTTPS ports but are not official well-known ports.
Q3 Networking Fundamentals
Which IPv6 address type begins with FE80::/10?
  1. Global unicast address
  2. Link-local address
  3. Multicast address
  4. Loopback address
✓ Correct Answer: B
IPv6 addresses starting with FE80::/10 (FE80 to FEBF) are link-local addresses. They are automatically configured on all IPv6-enabled interfaces and are valid only within a single network segment—they cannot be routed.
Q4 Networking Fundamentals
A network engineer is configuring a router interface as 10.0.0.95 255.255.255.240. The router is not routing packets to a web server with IP 10.0.0.81/28. What is the best explanation?
  1. The web server is in a different subnet.
  2. The router interface is configured with the broadcast address.
  3. The IP address space is a Class A network.
  4. The subnet is in a private address space.
✓ Correct Answer: B
With a /28 (255.255.240) subnet mask, each subnet has 16 addresses. The subnet range is 10.0.0.80/28: network address 10.0.0.80, usable addresses 10.0.0.81-10.0.0.94, broadcast address 10.0.0.95. The router interface is configured with the broadcast address, which is not a valid host address.
Q5 Networking Fundamentals
Which protocol can automatically assign IP addresses, subnet masks, default gateways, and DNS server addresses to client devices?
  1. ARP
  2. DHCP
  3. DNS
  4. ICMP
✓ Correct Answer: B
DHCP (Dynamic Host Configuration Protocol) automatically provides IP configuration to clients. ARP resolves IP addresses to MAC addresses. DNS resolves hostnames to IP addresses. ICMP is used for network diagnostic tools like ping and traceroute.
Q6 Networking Fundamentals
A network technician sees traffic going to 224.7.8.99. Which of the following describes this traffic type?
  1. Broadcast
  2. Unicast
  3. Multicast
  4. Anycast
✓ Correct Answer: C
The address 224.7.8.99 falls within the IPv4 Class D range (224.0.0.0-239.255.255.255), which is reserved for multicast traffic. Multicast delivers traffic to a specific group of receivers.
Q7 Networking Fundamentals
Which protocol operates at the Application layer and is used to securely transfer files between a client and a server over an encrypted connection?
  1. FTP
  2. TFTP
  3. SFTP
  4. SCP
✓ Correct Answer: C
SFTP (SSH File Transfer Protocol) provides secure file transfer over an encrypted SSH connection (TCP port 22). FTP transmits data in cleartext. TFTP uses UDP with no authentication. SCP also uses SSH but SFTP provides more complete file management capabilities.
Q8 Networking Fundamentals
Which DNS record type maps a hostname to an IPv4 address?
  1. AAAA record
  2. CNAME record
  3. A record
  4. MX record
✓ Correct Answer: C
An A (Address) record maps a hostname to a 32-bit IPv4 address. AAAA records map to IPv6 addresses. CNAME records create aliases. MX records specify mail servers.
Q9 Networking Fundamentals
A network administrator needs to divide a Class B network into four equal subnets, each with a host range of 1,000 hosts. Which subnet mask should be used?
  1. 255.255.0.0
  2. 255.255.252.0
  3. 255.255.255.0
  4. 255.255.255.128
✓ Correct Answer: B
A /22 subnet mask (255.255.252.0) provides 10 host bits, yielding 2^10 = 1024 total addresses or 1022 usable hosts per subnet. This fits the requirement of ~1,000 hosts per subnet.
Q10 Networking Fundamentals
A network administrator needs to add 255 usable IP addresses to the network. A /24 is currently in use. Which prefix would fulfill this need?
  1. /23
  2. /25
  3. /29
  4. /32
✓ Correct Answer: A
A /23 subnet provides 512 total addresses, of which 510 are usable. This satisfies the need for 255 additional addresses. /25 provides only 126 usable addresses, /29 provides 6, and /32 provides only 1.

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Frequently Asked Questions

Network+ is considered more challenging than A+ because it requires deeper understanding of networking concepts rather than hardware familiarity. Candidates typically need 9-12 months of hands-on networking experience. Our practice tests include PBQs that simulate real networking scenarios to bridge the gap between theory and practice.

V9 (launched June 2024) adds stronger coverage of cloud connectivity (NFV, VPC, network security groups), virtualization, network function virtualization (NFV), and updated security hardening techniques. If you're studying for the current exam, make sure your materials are V9-specific — our question bank is fully updated for N10-009.

CompTIA doesn't publish the exact number, but candidates report 3-5 PBQs alongside multiple-choice questions. PBQs require you to configure, drag-and-drop, or troubleshoot in a simulated environment. Our practice engine includes PBQ simulators so you won't be surprised on exam day.

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