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CompTIA Network+ — Operations, Security and Troubleshooting flashcards

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Network+ domains 3 to 5: documentation, SNMP, syslog, NetFlow, DR metrics, DHCP, DNS and time services, remote access, layer 2 attacks and defences, the seven-step method, interface counters and CLI tools.

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

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  1. A physical network diagram and a logical network diagram describe the same site. What does each one show?
    The physical diagram shows real devices, cable runs, ports and where equipment sits. The logical diagram shows how traffic flows: subnets, VLANs, IP addressing and routing between them.
    Network Operations › Documentation and Life Cycle
  2. What does an IPAM system do that a shared address spreadsheet cannot?
    IP address management (IPAM) tracks subnets and assignments centrally and ties into DHCP and DNS, so it sees real leases and records, flags conflicts and shows how full each scope is in real time.
    Network Operations › Documentation and Life Cycle
  3. What is a golden (baseline) configuration, and how is it used?
    A golden configuration is the approved, known-good config for a device type. Running configs are compared against it to catch configuration drift, and it is the template for restoring or deploying devices.
    Network Operations › Documentation and Life Cycle
  4. A vendor publishes end-of-life and end-of-support dates for a switch model. Which date matters most for security, and why?
    End of support — after it the vendor stops issuing firmware fixes and security patches, so the device accumulates unpatched vulnerabilities. End of life usually means it is no longer sold or developed.
    Network Operations › Documentation and Life Cycle
  5. What is the difference between a honeypot and a honeynet?
    A honeypot is a single decoy system built to attract attackers; a honeynet is a network of decoys. Both reveal attacker techniques and give early warning, since no legitimate user should touch them.
    Network Security › Security Concepts
  6. Why does isolating payment systems in their own segment cut the work of a PCI DSS assessment?
    Segmentation reduces scope — only systems that store, process or can reach cardholder data, or can affect its security, are assessed, so walling the cardholder data environment off keeps the rest of the network out of scope.
    Network Security › Security Concepts
  7. What is microsegmentation, and how does it support zero trust?
    Microsegmentation applies security policy to individual workloads, so even servers on the same subnet must pass a rule to talk. It blocks unchecked east-west movement after a breach.
    Network Security › Security Concepts
  8. What are the seven steps of the Network+ troubleshooting methodology, in order?
    1. Identify the problem
    2. Establish a theory of probable cause
    3. Test the theory
    4. Plan the fix and identify its potential effects
    5. Implement the fix or escalate
    6. Verify full functionality and add preventive measures
    7. Document findings, actions, outcomes and lessons learned.
    Network Troubleshooting › Methodology
  9. When forming a theory of probable cause, which three OSI-based approaches can a technician take?
    Top-to-bottom (start at the application), bottom-to-top (start at the cable), or divide and conquer (start in the middle, say with a ping, and move up or down depending on the result).
    Network Troubleshooting › Methodology
  10. The fix for a routing fault requires restarting a core router. Which step of the methodology makes the technician weigh that before acting?
    Establish a plan of action and identify potential effects — the outage, affected users and timing must be understood, and a change window arranged if needed, before the fix is implemented.
    Network Troubleshooting › Methodology

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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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