CompTIA N10-009 Practice Test 26

Question 250

A network team observes: A low-capacity edge switch becomes STP root after replacement and traffic takes undesirable uplinks. What is the MOST appropriate corrective action or technical decision?

Configure compatible LACP port channels on both ends.
Set deterministic root bridge priority on appropriate distribution switches.
Remove the unauthorized bridge, confirm edge role, and follow controlled reenable procedure.
Disable unused access ports and configure supported port security for required active jacks.

Explanation

Correct Answer

STP selects the root based on bridge identifier priority. Bridge priorities do not designate the intended root.

Incorrect Answers

Configuring compatible LACP port channels on both ends would not set deterministic root bridge priority on appropriate distribution switches.

Removing the unauthorized bridge, confirm edge role, and follow controlled reenable procedure would not set deterministic root bridge priority on appropriate distribution switches.

Disable unused access ports and configure supported port security for required active jacks would not set deterministic root bridge priority on appropriate distribution switches.

Question 251

A network team addresses this situation: A low-capacity edge switch becomes STP root after replacement and traffic takes undesirable uplinks. After the corrective action, which test or result BEST verifies that the problem is resolved?

Verify bundled-member state and traffic redistribution on link failure.
Check port VLAN and renew an office DHCP lease.
Inspect elected root ID and path costs after convergence.
Capture VLAN 40-tagged frames and test same-VLAN host reachability.

Explanation

Correct Answer

Expected root election validates the priority plan.

Incorrect Answers

Verify bundled-member state and traffic redistribution on link failure. It does not inspect elected root ID and path costs after convergence.

Correct VLAN and subnet address confirm access membership. It does not inspect elected root ID and path costs after convergence.

That test concerns 802.1q tagged trunk rather than the specific reported condition. Expected root election validates the priority plan.

Question 252

A network specialist investigates this evidence: A low-capacity edge switch becomes STP root after replacement and traffic takes undesirable uplinks. Which underlying condition BEST explains the observed failure or requirement?

The physical links have not been bundled into an agreed aggregation.
BPDU guard intentionally shuts the port after receiving BPDUs.
VLAN 40 is missing from the trunk's allowed tagged VLAN list.
Bridge priorities do not designate the intended root.

Explanation

Correct Answer

Bridge priorities do not designate the intended root. STP selects the root based on bridge identifier priority.

Incorrect Answers

LACP forms a logical link only when partner identities and member parameters agree. The missing change involves bridge priorities do not designate the intended root.

BPDU guard intentionally shuts the port after receiving BPDUs. That does not establish bridge priorities do not designate the intended root.

This describes the 802.1q tagged trunk mechanism, not the failure in this case. STP selects the root based on bridge identifier priority.

Question 253

A network team observes: A switch port becomes error-disabled immediately when a technician plugs another unmanaged switch into an edge port. What is the MOST appropriate corrective action or technical decision?

Remove the unauthorized bridge, confirm edge role, and follow controlled reenable procedure.
Disable unused access ports and configure supported port security for required active jacks.
Create and enable an SVI for VLAN 55 with gateway IP and routing enabled.
Configure compatible LACP port channels on both ends.

Explanation

Correct Answer

BPDU guard protects access ports from unexpected switching devices. Bpdu guard intentionally shuts the port after receiving bpdus.

Incorrect Answers

Disable unused access ports and configure supported port security for required active jacks would not remove the unauthorized bridge, confirm edge role, and follow controlled reenable procedure.

Creating and enabling an SVI for VLAN 55 with gateway IP and routing enabled would not remove the unauthorized bridge, confirm edge role, and follow controlled reenable procedure.

Configuring compatible LACP port channels on both ends would not remove the unauthorized bridge, confirm edge role, and follow controlled reenable procedure.

Question 254

A network team addresses this situation: A switch port becomes error-disabled immediately when a technician plugs another unmanaged switch into an edge port. After the corrective action, which test or result BEST verifies that the problem is resolved?

Connect a test unauthorized MAC and observe the configured violation response.
Inspect the guard violation reason and retest with a normal endpoint.
Check SVI operational state and ping it from VLAN clients.
Capture VLAN 40-tagged frames and test same-VLAN host reachability.

Explanation

Correct Answer

Guard state and successful compliant endpoint confirm intended behavior.

Incorrect Answers

Connect a test unauthorized MAC and observe the configured violation response. It does not inspect the guard violation reason and retest with a normal endpoint.

VLAN membership and 802.1Q tagging determine which Layer 2 broadcast domain carries each frame. It does not inspect the guard violation reason and retest with a normal endpoint.

That test concerns 802.1q tagged trunk rather than the specific reported condition. Guard state and successful compliant endpoint confirm intended behavior.

Question 255

A network specialist investigates this evidence: A switch port becomes error-disabled immediately when a technician plugs another unmanaged switch into an edge port. Which underlying condition BEST explains the observed failure or requirement?

The access port lacks device admission restrictions.
The access port is in the wrong VLAN.
BPDU guard intentionally shuts the port after receiving BPDUs.
Bridge priorities do not designate the intended root.

Explanation

Correct Answer

BPDU guard intentionally shuts the port after receiving BPDUs. BPDU guard protects access ports from unexpected switching devices.

Incorrect Answers

The access port lacks device admission restrictions. That does not establish bPDU guard intentionally shuts the port after receiving BPDUs.

An untagged host inherits its access-port VLAN. That does not establish bPDU guard intentionally shuts the port after receiving BPDUs.

Bridge priorities do not designate the intended root. That does not establish bPDU guard intentionally shuts the port after receiving BPDUs.

Question 256

A network team observes: A storage network supports 9000-byte frames end-to-end except one uplink at 1500 and large transfers stall. What is the MOST appropriate corrective action or technical decision?

Restore compatible auto-negotiation or matching supported duplex settings.
Configure compatible LACP port channels on both ends.
Assign the port to the approved data VLAN and retain separate voice configuration.
Align supported MTUs on every hop or reduce workload frame size to the path limit.

Explanation

Correct Answer

Oversized frames cannot cross a segment with a smaller supported MTU. The path mtu is inconsistent for jumbo frames.

Incorrect Answers

Restoring compatible auto-negotiation or matching supported duplex settings would not align supported MTUs on every hop or reduce workload frame size to the path limit.

Configuring compatible LACP port channels on both ends would not align supported MTUs on every hop or reduce workload frame size to the path limit. Oversized frames cannot cross a segment with a smaller supported MTU.

Assigning the port to the approved data VLAN and retaining separate voice configuration would not align supported MTUs on every hop or reduce workload frame size to the path limit.

Question 257

A network team addresses this situation: A storage network supports 9000-byte frames end-to-end except one uplink at 1500 and large transfers stall. After the corrective action, which test or result BEST verifies that the problem is resolved?

Probe accepted frame size and verify jumbo transfers.
Check both negotiated modes and error counters under sustained traffic.
Run a simultaneous call and transfer while measuring voice latency and jitter.
Check port VLAN and renew an office DHCP lease.

Explanation

Correct Answer

Frame and path MTU limits can drop oversized packets without changing higher-layer routes. Verification of this result involves probe accepted frame size and verify jumbo transfers.

Incorrect Answers

Matching duplex and reduced collisions confirm remediation. That check cannot demonstrate supported frame size across the required link path.

Traffic quality during contention validates voice policy. That check cannot demonstrate supported frame size across the required link path.

Correct VLAN and subnet address confirm access membership. That check cannot demonstrate supported frame size across the required link path.

Question 258

A network specialist investigates this evidence: A storage network supports 9000-byte frames end-to-end except one uplink at 1500 and large transfers stall. Which underlying condition BEST explains the observed failure or requirement?

Interface duplex settings disagree across the Ethernet link.
The path MTU is inconsistent for jumbo frames.
The physical links have not been bundled into an agreed aggregation.
The access port is in the wrong VLAN.

Explanation

Correct Answer

The path MTU is inconsistent for jumbo frames. Oversized frames cannot cross a segment with a smaller supported MTU.

Incorrect Answers

Interface duplex settings disagree across the Ethernet link. That does not establish supported frame size across the required link path.

LACP forms a logical link only when partner identities and member parameters agree. The missing change involves the path MTU is inconsistent for jumbo frames.

An untagged host inherits its access-port VLAN. That does not establish supported frame size across the required link path.

Question 259

A network team observes: A workstation waits through spanning-tree state transitions on every reboot and often misses its first DHCP broadcast. What is the MOST appropriate corrective action or technical decision?

Configure compatible LACP port channels on both ends.
Restore spanning-tree protection and remove the accidental redundant loop.
Enable an appropriate STP edge or PortFast feature on verified end-host ports.
Remove the unauthorized bridge, confirm edge role, and follow controlled reenable procedure.

Explanation

Correct Answer

Edge designation permits rapid forwarding while retaining loop safeguards. The edge access port is waiting for standard stp convergence.

Incorrect Answers

Configuring compatible LACP port channels on both ends would not enable an appropriate STP edge or PortFast feature on verified end-host ports.

Restoring spanning-tree protection and removing the accidental redundant loop would not enable an appropriate STP edge or PortFast feature on verified end-host ports.

Removing the unauthorized bridge, confirm edge role, and follow controlled reenable procedure would not enable an appropriate STP edge or PortFast feature on verified end-host ports.

Question 260

A network team addresses this situation: A workstation waits through spanning-tree state transitions on every reboot and often misses its first DHCP broadcast. After the corrective action, which test or result BEST verifies that the problem is resolved?

Verify bundled-member state and traffic redistribution on link failure.
Check root and blocked-port roles while monitoring broadcast rate.
Inspect elected root ID and path costs after convergence.
Time port forwarding and DHCP lease after reboot.

Explanation

Correct Answer

Rapid lease acquisition validates edge port operation.

Incorrect Answers

Verify bundled-member state and traffic redistribution on link failure. Verification of this result involves time port forwarding and DHCP lease after reboot.

Stable topology and counters demonstrate loop suppression. Verification of this result involves time port forwarding and DHCP lease after reboot.

Expected root election validates the priority plan. That check cannot demonstrate successful client IP addressing from the correct scope.

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Pass Your CompTIA N10-009 Exam Easy!

Question 250

Explanation

Correct Answer

Incorrect Answers

Question 251

Explanation

Correct Answer

Incorrect Answers

Question 252

Explanation

Correct Answer

Incorrect Answers

Question 253

Explanation

Correct Answer

Incorrect Answers

Question 254

Explanation

Correct Answer

Incorrect Answers

Question 255

Explanation

Correct Answer

Incorrect Answers

Question 256

Explanation

Correct Answer

Incorrect Answers

Question 257

Explanation

Correct Answer

Incorrect Answers

Question 258

Explanation

Correct Answer

Incorrect Answers

Question 259

Explanation

Correct Answer

Incorrect Answers

Question 260

Explanation

Correct Answer

Incorrect Answers

CompTIA Network+ (N10-009) Practice Tests