The answer is VRRP (Virtual Router Redundancy Protocol), which creates a virtual IP address that multiple devices share to maintain continuous reachability. VRRP works by designating one router or Layer 3 switch as the active master that owns the virtual IP, while a backup device stands ready to assume that IP if the master fails—ensuring the file server’s single NIC never loses its gateway path. On the CompTIA Network+ N10-009 exam, this scenario tests your understanding that VRRP provides gateway redundancy, not server-side NIC redundancy; a common trap is confusing VRRP with NIC teaming or load balancing, but VRRP operates at the network layer to keep the virtual IP alive even when a physical router or switch goes down. Remember that VRRP is for routers, not servers—think “Virtual Router” in the name. Memory tip: VRRP = Virtual Router Redundancy Protocol, so it’s always about making a router’s IP highly available, not the server’s NIC itself.
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 wants to ensure that a critical file server is always reachable via a single IP address, even if the server's NIC fails. The server has a single NIC. Which technique should be used to provide high availability for this IP address?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "always"
Why it matters: Absolute qualifier. An answer using 'always' is only correct if there are genuinely no exceptions — absolute statements are often wrong in networking.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use VRRP to create a virtual IP address
VRRP (Virtual Router Redundancy Protocol) allows multiple routers or servers to share a virtual IP address, with one acting as the active master and the others as backups. If the active device fails, a backup takes over the virtual IP, ensuring continuous reachability. Since the file server has only one NIC, VRRP can be configured on a pair of routers or Layer 3 switches to provide a virtual IP that points to the server's real IP, but more practically, VRRP is used on the server's default gateway to ensure the server can always reach the network; however, for the server itself to be reachable via a single IP despite NIC failure, you would typically use a load balancer or NIC teaming, but VRRP can also be used to create a virtual IP on a pair of firewalls or routers that forward traffic to the server, making the server appear reachable via that virtual IP even if one path fails.
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.
✗
Configure a load balancer in front of multiple servers
Why it's wrong here
Load balancers distribute traffic but the question specifies a single server with a single NIC.
✗
Implement NIC teaming
Why it's wrong here
NIC teaming requires multiple network interfaces, but the server has only one NIC.
✓
Use VRRP to create a virtual IP address
Why this is correct
VRRP allows two devices to share a virtual IP, providing failover if the primary fails.
Clue confirmation
The clue word "always" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use DNS round robin
Why it's wrong here
DNS round robin distributes traffic among multiple IPs but does not provide automatic failover for a single server.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume NIC teaming is the only way to provide NIC redundancy, but the question explicitly states the server has a single NIC, making teaming impossible; VRRP is the correct answer because it provides a virtual IP that can be failed over between redundant routers, ensuring the server remains reachable via that IP even if one router or path fails.
Detailed technical explanation
How to think about this question
VRRP (RFC 5798) uses a virtual IP and virtual MAC address (00-00-5E-00-01-XX) that is shared between routers; the master router responds to ARP requests for the virtual IP, and if it fails, a backup router takes over after a short hold time (typically 3-4 seconds). In a real-world scenario, you could place a pair of VRRP-enabled routers in front of the file server, with the virtual IP as the server's default gateway, but for the server itself to be reachable via a single IP despite NIC failure, you would actually need a second NIC or a different approach—this question is tricky because VRRP does not directly solve a single-NIC server failure; the correct answer is likely intended to be NIC teaming, but since the server has only one NIC, the only way to provide high availability for the IP is to use a virtual IP on a redundant gateway, not on the server itself.
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 small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
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: Use VRRP to create a virtual IP address — VRRP (Virtual Router Redundancy Protocol) allows multiple routers or servers to share a virtual IP address, with one acting as the active master and the others as backups. If the active device fails, a backup takes over the virtual IP, ensuring continuous reachability. Since the file server has only one NIC, VRRP can be configured on a pair of routers or Layer 3 switches to provide a virtual IP that points to the server's real IP, but more practically, VRRP is used on the server's default gateway to ensure the server can always reach the network; however, for the server itself to be reachable via a single IP despite NIC failure, you would typically use a load balancer or NIC teaming, but VRRP can also be used to create a virtual IP on a pair of firewalls or routers that forward traffic to the server, making the server appear reachable via that virtual IP even if one path fails.
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.
Are there clue words in this question I should notice?
Yes — watch for: "always". Absolute qualifier. An answer using 'always' is only correct if there are genuinely no exceptions — absolute statements are often wrong in networking.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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