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Free CompTIA Network+ Practice — N10-009 practice questions (2026)

What is the format? These ten original multiple-choice questions introduce CompTIA Network+ Practice — N10-009 study topics. They are practice material, not actual exam items. Official assessments may use different formats; check the current candidate guide for your credential.

What does this prepare me for? Independent N10-009 subject practice, not CompTIA material or verified exam alignment. No PBQ simulation or scaled-score prediction.

What should I study? Start with networking concepts, network implementation and operations, network security and troubleshooting. This bank uses N10-009. Check the current exam objectives, adopted editions, and permitted references before planning your study.

How should I practice? Choose an answer before opening the explanation. Read the cited reference and revisit unfamiliar topics. These samples are general preparation, not jurisdiction-specific advice.

Explore full CompTIA Network+ Practice — N10-009 →

1 / Networking concepts

In the OSI model, which layer is associated with forwarding packets between IP networks?

  1. Network layer
  2. Physical layer
  3. Presentation layer
  4. Session layer
Show answer & explanation

Network layer

IP routing is a network-layer function; physical signaling and application representation are different concerns.

CompTIA Network+ N10-009 domain: Networking concepts; Microsoft Learn, Windows network architecture and the OSI model, Network layer

2 / Networking concepts

An ACL must permit the registered FTP control service over TCP. Which destination port is intended?

  1. 69
  2. 22
  3. 20
  4. 21
Show answer & explanation

21

The ftp/tcp entry is 21. Port 20 is the default FTP data registration, not the control connection.

CompTIA Network+ N10-009 domain: Networking concepts; IANA ftp/tcp

3 / Networking concepts

A secondary DNS server compares a zone version with its stored copy. Which SOA field represents that version?

  1. MX preference
  2. Subnet mask
  3. Serial
  4. TCP source port
Show answer & explanation

Serial

The SOA serial is the zone version number. It is distinct from mail preference and host networking settings.

CompTIA Network+ N10-009 domain: Networking concepts; RFC 1035 §3.3.13

4 / Networking concepts

A report discusses frames exchanged between physical addresses and MAC frame-error checks. Which OSI layer is involved?

  1. Presentation
  2. Data link
  3. Network
  4. Session
Show answer & explanation

Data link

The data link layer handles frames and physical addresses. Its MAC sublayer manages medium access and frame checks.

CompTIA Network+ N10-009 domain: Networking concepts; Microsoft Learn OSI, Data link layer

5 / Networking concepts

During IPv6 initialization, what does the source address :: indicate?

  1. The loopback destination
  2. Absence of an assigned source address
  3. All Internet routers
  4. A globally unique interface identifier
Show answer & explanation

Absence of an assigned source address

The all-zero unspecified address indicates absence of an address. It must not be assigned to a node or used as a destination.

CompTIA Network+ N10-009 domain: Networking concepts; RFC 4291 §2.5.2

6 / Network implementation and operations

Installed routes include 10.40.0.0/16 via A and 10.40.8.0/24 via B. Which next hop handles 10.40.8.17 under longest-prefix forwarding?

  1. Both routes are ignored
  2. B
  3. A
  4. The next hop with the alphabetically first name
Show answer & explanation

B

The /24 is the more-specific match. This compares installed different-length prefixes, not route-source preference for the same prefix.

CompTIA Network+ N10-009 domains: Network implementation / Network operations; RFC 4632 §5.1

7 / Network implementation and operations

A Windows path trace is slowed by reverse name lookups. Which tracert option suppresses those lookups?

  1. /6
  2. /d
  3. /w
  4. /h
Show answer & explanation

/d

The /d option stops resolving intermediate IP addresses to names. The other switches control hop count, wait time, or address family.

CompTIA Network+ N10-009 domains: Network implementation / Network operations; Microsoft Learn tracert, /d

8 / Network implementation and operations

A change plan requires rollback to yesterday's approved switch settings. What should be retained to support that requirement?

  1. Only a list of open browser tabs
  2. Only an uptime screenshot
  3. The previous baseline configuration and associated records
  4. Only today's edited configuration
Show answer & explanation

The previous baseline configuration and associated records

CM-2(3) calls for retaining previous baseline versions to support rollback, including configuration files and associated documentation.

CompTIA Network+ N10-009 domains: Network implementation / Network operations; NIST SP 800-53 CM-2(3)

9 / Network security and troubleshooting

A confirmed network compromise is being handled under the incident plan. Which capability belongs in that process?

  1. Containment, eradication, and recovery coordinated with analysis
  2. Immediate destruction of all records
  3. Only changing the help-desk ticket title
  4. Permanent suspension of every business service regardless of scope
Show answer & explanation

Containment, eradication, and recovery coordinated with analysis

IR-4 includes preparation, detection and analysis, containment, eradication, and recovery. Actions should follow the plan and incident scope.

CompTIA Network+ N10-009 domains: Network security / Network troubleshooting; NIST SP 800-53 IR-4

10 / Network security and troubleshooting

Small IPv4 pings work, but larger ones report fragmentation needed when DF is set. Which area deserves investigation?

  1. Only the SSH username
  2. Path MTU and packet size
  3. Only DNS alias spelling
  4. Only the system's timezone label
Show answer & explanation

Path MTU and packet size

The Windows /f option sets Do Not Fragment and is documented for PMTU troubleshooting. Size-dependent behavior points toward an MTU constraint rather than name spelling.

CompTIA Network+ N10-009 domains: Network security / Network troubleshooting; Microsoft Learn ping, /f and /l

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