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CompTIA Network+ — Practice Questions flashcards

6 of 70 questions free to study here · 5 topics · the whole deck is built into Willys

Multiple-choice practice questions, one best answer each, on ports, media, subnetting, routing, switching, wireless, network services, security and troubleshooting tools.

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Practice deck · part of CompTIA Network+ · written against: Exam N10-009 objectives. Updated 2026-10-10.

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  1. A user can ping a file server by IP address, but the file share will not open. Working bottom-up, where should the technician look next?

    A) Layer 1, such as a damaged patch cable or a bad switch port
    B) Layer 4 and above, such as a blocked port or stopped service
    C) Layer 2, such as the wrong VLAN set on the user's access port
    D) Layer 3, such as a wrong default gateway on the client
    B) Layer 4 and above, such as a blocked port or stopped service

    A successful ping proves cabling, framing and IP routing all work end to end, so layers 1 to 3 are already cleared. The fault is a blocked port, a stopped service or an application problem.
    Networking Concepts › OSI Model
  2. A router chooses a next hop by reading the destination IP address. At which OSI layer is this decision made, and what is the unit of data there called?

    A) Layer 4 (transport), and the unit is a segment
    B) Layer 1 (physical), and the unit is a bit
    C) Layer 2 (data link), and the unit is a frame
    D) Layer 3 (network), and the unit is a packet
    D) Layer 3 (network), and the unit is a packet

    IP addressing and next-hop selection happen at the network layer, where data travels as packets. Frames and MAC-based forwarding belong to layer 2, which is a switch's job.
    Networking Concepts › OSI Model
  3. A router has 172.16.0.0/16 via R1, 172.16.8.0/21 via R2, 172.16.10.0/24 via R3 and a default route via R4. Where does it send a packet for 172.16.10.9?

    A) To R2
    B) To R3
    C) To R1
    D) To R4
    B) To R3

    Routers use the longest prefix match, and the /24 is the most specific route containing 172.16.10.9. The /21 (172.16.8.0 to 172.16.15.255) also matches, but it is less specific.
    Network Implementation › Routing
  4. The security team wants the firewall to send warnings and anything more severe to the syslog collector, but nothing less severe. Which threshold should be set?

    A) Level 5 (Notice)
    B) Level 4 (Warning)
    C) Level 7 (Debugging)
    D) Level 3 (Error)
    B) Level 4 (Warning)

    Syslog severities run from 0 (Emergency) to 7 (Debugging), and a threshold sends that level and every lower number. Level 3 would drop warnings, and level 5 would add notices.
    Network Operations › Monitoring
  5. A retailer wants to shrink the scope of its PCI DSS assessment. Which step helps most?

    A) Place the payment servers inside a honeynet for extra logging
    B) Segment the cardholder data environment from other systems
    C) Enable split tunnelling for remote payment-system staff
    D) Move all point-of-sale terminals onto the guest Wi-Fi
    B) Segment the cardholder data environment from other systems

    Only systems that store, process or can reach cardholder data are in scope, so walling them off keeps the rest of the network out. Mixing payment devices with guest traffic would make things worse.
    Network Security › Security Concepts
  6. A technician has tested and confirmed a theory of probable cause. What is the next step in the troubleshooting methodology?

    A) Establish a plan of action and identify potential effects
    B) Implement the solution or escalate as necessary
    C) Verify full system functionality and add preventive measures
    D) Document the findings, actions and lessons learned
    A) Establish a plan of action and identify potential effects

    After confirming the theory, the technician plans the fix and weighs its effects, such as outages and change windows. Implementing comes only after that plan.
    Network Troubleshooting › Methodology

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Concepts and ImplementationOperations, Security and Troubleshooting

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About these cards

Review status: Second-reader reviewed, with corrections applied.

Checked against:

  • CompTIA Network+ N10-009 exam objectives (topic outline only; no text copied)
  • Checked against the IANA Service Name and Transport Protocol Port Number Registry and the relevant IETF RFCs and IEEE 802 standards (reference only)
  • Subnetting answers verified with the Python standard-library ipaddress module

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