The answer is Virtual IP protocols like VRRP or HSRP, which are the correct choice for providing failover and load balancing at the network layer. These first-hop redundancy protocols allow two or more routers or server interfaces to share a single virtual IP address, so if the active interface fails, the standby seamlessly takes over, maintaining connectivity without requiring client reconfiguration. For load balancing, you can configure multiple virtual IP groups across the two interfaces, distributing traffic while preserving high availability. On the CompTIA Network+ N10-009 exam, this concept tests your understanding of Layer 3 redundancy versus link aggregation (LACP) at Layer 2—a common trap is confusing them. Remember that VRRP and HSRP operate at the network layer to provide gateway failover, while LACP bundles physical links for bandwidth. A helpful memory tip: think of the virtual IP as a "hot standby" address that floats between routers, ensuring the network never loses its default gateway.
N10-009 Network Operations Practice Question
This N10-009 practice question tests your understanding of network operations. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 needs to ensure high availability for a critical server that has two network interfaces connected to two different switches. Which configuration should be implemented to provide failover and load balancing at the network layer?
Why wrong: LACP combines multiple physical links into one logical link for increased bandwidth and redundancy at Layer 2, not for server failover across different switches.
B
Virtual IP (VRRP/HSRP)
VRRP/HSRP allows two devices to share a virtual IP address so that if one fails, the other takes over seamlessly, providing network-layer redundancy.
C
Spanning Tree Protocol (STP)
Why wrong: STP prevents loops in Layer 2 networks but does not provide failover for a server’s default gateway.
D
Port mirroring
Why wrong: Port mirroring copies traffic for monitoring purposes and does not contribute to high availability.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Virtual IP (VRRP/HSRP)
Virtual IP protocols like VRRP or HSRP provide first-hop redundancy by allowing two or more routers (or servers acting as routers) to share a virtual IP address. If the active interface fails, the standby interface takes over the virtual IP, ensuring seamless failover at Layer 3. Additionally, with multiple virtual IP groups, traffic can be load-balanced across the two interfaces, meeting both high-availability and load-balancing requirements at the network layer.
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.
✗
Link aggregation (LACP)
Why it's wrong here
LACP combines multiple physical links into one logical link for increased bandwidth and redundancy at Layer 2, not for server failover across different switches.
✓
Virtual IP (VRRP/HSRP)
Why this is correct
VRRP/HSRP allows two devices to share a virtual IP address so that if one fails, the other takes over seamlessly, providing network-layer redundancy.
Related concept
Read the scenario before looking for a memorised answer.
✗
Spanning Tree Protocol (STP)
Why it's wrong here
STP prevents loops in Layer 2 networks but does not provide failover for a server’s default gateway.
✗
Port mirroring
Why it's wrong here
Port mirroring copies traffic for monitoring purposes and does not contribute to high availability.
Common exam traps
Common exam trap: answer the scenario, not the keyword
CompTIA often tests the distinction between Layer 2 redundancy (LACP, STP) and Layer 3 redundancy (VRRP/HSRP), leading candidates to choose Link Aggregation because it sounds like 'load balancing' without realizing it operates at a different layer and cannot provide failover across separate switches at the network layer.
Detailed technical explanation
How to think about this question
VRRP (RFC 5798) and HSRP (Cisco proprietary) use a virtual IP and virtual MAC address that the server's default gateway points to. The active router responds to ARP requests for the virtual IP, while the standby router monitors hello messages (every 3 seconds by default in HSRP) and takes over if three hellos are missed. For load balancing, multiple virtual IP groups can be configured so that each server interface uses a different active router, distributing traffic across both switches.
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 practitioner preparing for the N10-009 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
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 Operations — This question tests Network Operations — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Virtual IP (VRRP/HSRP) — Virtual IP protocols like VRRP or HSRP provide first-hop redundancy by allowing two or more routers (or servers acting as routers) to share a virtual IP address. If the active interface fails, the standby interface takes over the virtual IP, ensuring seamless failover at Layer 3. Additionally, with multiple virtual IP groups, traffic can be load-balanced across the two interfaces, meeting both high-availability and load-balancing requirements at the network layer.
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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