CompTIA Network+ Certification Exam Practice Test
Network+ practice covers the principles behind connecting devices and moving traffic across wired and wireless networks. The available questions use scenarios involving Layer 2 segmentation, routing between IP subnets, address translation, DNS and ARP resolution, loop prevention, fiber selection, HTTPS ports, and private connectivity to cloud services.
Exam overview
About the CompTIA Network+ Certification Exam
Network technicians and administrators must interpret how traffic moves through a network and select configurations that meet connectivity and isolation needs. Key concepts include broadcast domains and VLANs, switching behavior and Spanning Tree Protocol, IPv4 addressing and routing, and the roles of DNS and ARP. Scenario questions also exercise decisions about publishing internal services with address-and-port translation, verifying DNS responses with command-line tools, and choosing single-mode fiber for longer links. Understanding well-known service ports helps when configuring or troubleshooting application access. Private connectivity questions call for distinguishing traffic carried over a provider connection from traffic that traverses the public internet. Together, these tasks test practical reasoning about network design, protocol function, service reachability, and troubleshooting evidence.
Sample Practice Questions
Review a selection from this exam's published US Practice Tests practice bank.
A network administrator wants to separate guest wireless clients from internal office devices while using the same physical switch infrastructure. Which technology is most directly suited to creating separate Layer 2 broadcast domains?
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Correct answer: AVirtual LANs (VLANs) logically separate devices into distinct Layer 2 broadcast domains on shared switching infrastructure. Communication between VLANs requires Layer 3 routing.
A network administrator wants to allow users to access an internal web server from the internet without exposing the server's private address directly. Which technique commonly maps a public address and port to the server's private address and port?
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Correct answer: APort forwarding configures a router or firewall to direct traffic arriving at a specified public address and port to a designated internal address and port. It is commonly used to publish a service hosted on a private network.
A switch has redundant physical links that could create a Layer 2 loop. Which protocol helps prevent loops by placing some redundant links into a non-forwarding state?
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Correct answer: ASpanning Tree Protocol (STP) detects redundant Layer 2 paths and blocks selected links from forwarding, preventing switching loops while retaining paths that can be used if the topology changes.
Which service translates a human-readable host name, such as server.example, into an IP address?
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Correct answer: BThe Domain Name System (DNS) resolves host names to records that can provide IP addresses and other information. NTP synchronizes clocks, SNMP supports monitoring and management, and SMTP transfers email.
A network device needs to forward traffic between two different IP subnets. Which device function is required?
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Correct answer: BRouting forwards packets between distinct IP networks by consulting routing information. Layer 2 switching forwards frames within a local network.
A network engineer needs to discover the IPv4 hardware address associated with a device on the local network when its IPv4 address is known. Which protocol performs this resolution?
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Correct answer: AAddress Resolution Protocol (ARP) resolves a known IPv4 address to the corresponding link-layer hardware address on the local network so an Ethernet frame can be delivered.
A network engineer is planning a point-to-point fiber connection between two buildings. Which fiber type is generally preferred for longer distances and higher bandwidth over distance?
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Correct answer: ASingle-mode fiber carries light along a very narrow core and is generally suited to longer-distance links with high bandwidth. Multimode fiber is commonly used for shorter-distance fiber connections.
How to use this practice test
The free US Practice Tests bank contains 50 published questions. A practice session draws up to 20 random questions and displays results afterward. Use each scenario to identify the network layer or service involved, then check whether your reasoning accounts for traffic flow, segmentation, and the stated operational goal.
Preparation tips
- Sketch how VLANs, IP subnets, switches, and routers differ; identify which device or configuration separates Layer 2 broadcast domains versus forwards between subnets.
- Trace a client request through DNS name resolution, ARP address resolution on the local IPv4 network, and the relevant application port.
- Compare static and dynamic NAT concepts with port forwarding, and explain how a public address and port can reach a private server endpoint.
- Review how Spanning Tree prevents Layer 2 loops by blocking redundant paths, and distinguish that behavior from link aggregation.
- Relate fiber type to link distance, and compare private cloud connectivity with routing service traffic over the public internet.