The answer is the default gateway. This is the correct choice because the switch’s management interface, typically a virtual interface such as the VLAN 1 SVI or a dedicated management VLAN, operates as a Layer 3 endpoint that must route traffic across subnets. Without a default gateway configured, the switch can only respond to management traffic originating from hosts on the same local subnet, making remote management from a different network segment impossible. On the CompTIA Network+ N10-009 exam, this concept tests your understanding of how Layer 2 switches handle out-of-band management traffic; a common trap is assuming that simply assigning an IP address to the management interface is enough, when in fact the default gateway provides the necessary route for return traffic. A useful memory tip is to think of the default gateway as the “exit door” for the switch’s management traffic—without it, the switch is locked inside its own subnet.
N10-009 Network Implementation Practice Question
This N10-009 practice question tests your understanding of network implementation. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A network administrator is configuring a new switch in a production environment. The switch must be managed remotely. Which of the following should be configured on the switch's management interface?
The default gateway allows the management interface to communicate with devices outside its own subnet, which is essential for remote management from another network.
B
Spanning tree priority
Why wrong: Spanning tree priority is used for loop prevention and root bridge election, not for remote management connectivity.
C
VLAN 1 membership
Why wrong: While the management interface is often assigned to VLAN 1 by default, membership alone does not enable remote management; an IP configuration and default gateway are still required.
D
Port security
Why wrong: Port security limits MAC addresses on access ports to prevent unauthorized devices. It does not affect the management interface's ability to be reached remotely.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Default gateway
The default gateway is required for remote management because the management interface (often a virtual interface like VLAN 1 or a dedicated management VLAN) needs a route to reach devices on different subnets. Without a default gateway, the switch can only be accessed from hosts within the same subnet, making remote management impossible across routed networks.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
Default gateway
Why this is correct
The default gateway allows the management interface to communicate with devices outside its own subnet, which is essential for remote management from another network.
Related concept
Read the scenario before looking for a memorised answer.
✗
Spanning tree priority
Why it's wrong here
Spanning tree priority is used for loop prevention and root bridge election, not for remote management connectivity.
✗
VLAN 1 membership
Why it's wrong here
While the management interface is often assigned to VLAN 1 by default, membership alone does not enable remote management; an IP configuration and default gateway are still required.
✗
Port security
Why it's wrong here
Port security limits MAC addresses on access ports to prevent unauthorized devices. It does not affect the management interface's ability to be reached remotely.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often think VLAN 1 membership (Option C) is sufficient for remote management, forgetting that the switch needs a default gateway to route management traffic beyond its local subnet.
Detailed technical explanation
How to think about this question
The management interface is an SVI (Switch Virtual Interface) that requires an IP address and subnet mask; the default gateway is the next-hop router's IP address used for traffic destined outside the local subnet. In a production environment, the management interface is often placed in a dedicated management VLAN (e.g., VLAN 99) to isolate management traffic from user data, and the default gateway must point to the management VLAN's router interface. Without the default gateway, the switch can only respond to ARP requests within its own subnet, so SSH, SNMP, or HTTPS sessions from remote subnets will fail.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A help-desk technician troubleshoots why a newly connected PC cannot reach shared printers on the same floor. The cable is good, the switch port is active, but the PC is in VLAN 20 and the printers are in VLAN 10. The uplink trunk only allows VLAN 10. A trunk being up does not mean every VLAN crosses it.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this N10-009 question in full detail.
Network Implementation — This question tests Network Implementation — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Default gateway — The default gateway is required for remote management because the management interface (often a virtual interface like VLAN 1 or a dedicated management VLAN) needs a route to reach devices on different subnets. Without a default gateway, the switch can only be accessed from hosts within the same subnet, making remote management impossible across routed networks.
What should I do if I get this N10-009 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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