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CompTIA Network+ 2025 past questions and answers

This 2025 CompTIA Network+ set has 20 practice questions. Try these 5 free sample questions, tap a question to reveal the answer and explanation. Then practise the whole 2025 set with instant marking.

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Sample CompTIA Network+ 2025 questions

1. A workstation must use the highest usable host address in subnet 192.168.40.64/27. Which address should be assigned?
  1. 192.168.40.63
  2. 192.168.40.95
  3. 192.168.40.94
  4. 192.168.40.96

Answer: C. 192.168.40.94

A /27 has 32 addresses. The .64 address is the network ID and .95 is the broadcast, so the usable range is .65 through .94. .96 starts the next subnet.

2. A DNS administrator lowers a record's TTL from 24 hours to 5 minutes before an address migration. What is the primary expected effect after resolvers honor the new TTL?
  1. Cached answers expire sooner, allowing clients to obtain the changed record sooner
  2. DNS queries are encrypted between clients and authoritative servers
  3. The authoritative server stops responding to recursive queries
  4. The DNS zone is automatically transferred to secondary servers

Answer: A. Cached answers expire sooner, allowing clients to obtain the changed record sooner

TTL controls how long a DNS response may remain cached. A shorter TTL reduces the wait for cached answers to expire; it does not encrypt DNS or initiate a zone transfer.

3. An enterprise voice application is experiencing jitter during periods of heavy data transfers. Which network feature is most directly intended to prioritize latency-sensitive voice traffic during congestion?
  1. QoS classification and queuing
  2. DNSSEC validation
  3. Port address translation
  4. MAC address aging

Answer: A. QoS classification and queuing

QoS can classify voice packets and place them in an appropriate queue so they receive preferential treatment during congestion. DNSSEC, PAT, and MAC aging do not prioritize packet forwarding.

4. A service provider exchanges routing information with a customer network that has its own autonomous system number. Which routing protocol is designed for exchanging routes between autonomous systems?
  1. RIP
  2. OSPF
  3. IS-IS
  4. BGP

Answer: D. BGP

BGP is used for interdomain routing between autonomous systems, including provider-customer route exchange. OSPF, IS-IS, and RIP are interior gateway protocols.

5. An engineer connects an access switch to a distribution switch and needs VLANs 20, 30, and 40 to traverse the link. Which configuration is appropriate on both ends of the link?
  1. Configure both ports as access ports in VLAN 20
  2. Configure an 802.1Q trunk and allow VLANs 20, 30, and 40
  3. Configure a routed interface and disable VLAN tagging
  4. Enable port mirroring on both interfaces

Answer: B. Configure an 802.1Q trunk and allow VLANs 20, 30, and 40

An 802.1Q trunk carries multiple VLANs over a link, and the allowed-VLAN list should include the required VLANs. An access port carries one VLAN, while port mirroring is for traffic observation.

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