CompTIA Network+ Practice Questions: Switching

7 free, exam-style CompTIA Network+ (N10-009) practice questions covering Switching. Each question shows the correct answer and a clear explanation. Ready for the real thing? Take the full timed quiz below.

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Q1. What is the primary purpose of a VLAN?

A.Increase bandwidth
B.Segment broadcast domains✓ Correct
C.Encrypt traffic
D.Block DDoS attacks

Explanation: VLANs (Virtual Local Area Networks) logically segment Layer 2 broadcast domains, improving security, performance, and network management by isolating traffic between different user groups. Learn more.

Q2. What does a BPDU guard protect against?

A.ARP spoofing
B.Spanning Tree loops✓ Correct
C.DHCP exhaustion
D.VLAN hopping

Explanation: BPDU Guard disables ports receiving Bridge Protocol Data Units to prevent STP manipulation. Learn more.

Q3. What is the primary benefit of port aggregation?

A.Increased bandwidth✓ Correct
B.Lower latency
C.Stronger encryption
D.Longer range

Explanation: Port aggregation, also known as link aggregation or LACP (Link Aggregation Control Protocol), combines multiple physical ports into one logical connection. This increases total bandwidth and provides redundancy in case one link fails. Learn more.

Q4. A network technician needs to connect a new switch to an existing switch using a link that will carry traffic for multiple VLANs. Which type of port configuration is required on the inter-switch connection?

A.Access port
B.Trunk port✓ Correct
C.Routed port
D.SPAN port

Explanation: A trunk port is configured to carry traffic for multiple VLANs between switches. Frames on a trunk link are typically tagged with VLAN information (e.g., using 802.1Q). Learn more.

Q5. Which technology allows multiple VLANs to traverse a single switch link?

A.802.1Q trunking✓ Correct
B.NTP stratum
C.PAT overload only
D.Port mirroring

Explanation: 802.1Q adds VLAN tags to Ethernet frames so a trunk can carry multiple VLANs. Learn more.

Q6. Which protocol prevents Layer 2 loops in redundant switched networks?

A.STP✓ Correct
B.SNMP
C.SIP
D.SFTP

Explanation: Spanning Tree Protocol blocks redundant Layer 2 paths to prevent switching loops. Learn more.

Q7. Which redundancy method bundles multiple switch links into one logical link?

A.Link aggregation✓ Correct
B.NAT overload
C.Port forwarding
D.DNS round robin only

Explanation: Link aggregation combines physical interfaces for redundancy and increased capacity. Learn more.