The answer is TFTP, or Trivial File Transfer Protocol. Wireless LAN controllers use TFTP to transfer firmware to access points because it is a lightweight, connectionless protocol that requires minimal memory and processing overhead on the AP, making it ideal for simple, one-way binary file transfers during boot or upgrade cycles. On the CompTIA Network+ N10-009 exam, this concept tests your understanding of how centralized management reduces administrative burden—the controller acts as a TFTP server, and each AP acts as a client pulling the firmware image. A common trap is choosing FTP or HTTP, but those are too resource-intensive for low-power APs; TFTP’s lack of authentication and simplicity is actually a feature here, not a flaw. Memory tip: Think “TFTP = Tiny File Transfer for APs,” where the “T” stands for “Trivial” because the transfer is quick and simple.
N10-009 Network Operations Practice Question
This N10-009 practice question tests your understanding of network operations. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 engineer needs to update the firmware on dozens of access points located across multiple office floors. The APs are managed by a central wireless controller. Which protocol should the controller use to transfer the firmware file to each AP?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
TFTP
The correct answer is TFTP (Trivial File Transfer Protocol). Wireless LAN controllers (WLCs) use TFTP to push firmware images to lightweight access points (APs) because TFTP is lightweight, connectionless, and requires minimal memory and processing overhead on the AP. This makes it ideal for the simple, one-way file transfer of a firmware binary during the AP boot or upgrade process, where the AP acts as a TFTP client and the controller as the server.
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.
✗
FTP
Why it's wrong here
FTP requires authentication and connection setup, making it less efficient for bulk automated firmware updates to network devices.
✓
TFTP
Why this is correct
TFTP is lightweight and widely supported by network devices for transferring firmware images.
Related concept
Read the scenario before looking for a memorised answer.
✗
HTTP
Why it's wrong here
HTTP can be used, but it is not as commonly implemented for firmware updates in network devices as TFTP.
✗
SNMP
Why it's wrong here
SNMP is designed for management and monitoring, not for file transfer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often choose FTP or HTTP because they are more familiar for file transfers, but they overlook that TFTP is the standard protocol used by Cisco wireless controllers for AP firmware upgrades due to its simplicity and low overhead.
Detailed technical explanation
How to think about this question
TFTP uses UDP port 69 and a simple lock-step protocol with fixed 512-byte data blocks, making it efficient for embedded devices with limited resources. In a Cisco WLC environment, the controller automatically serves the firmware image via TFTP when an AP boots in 'lightweight' mode, and the AP requests the image using its own IP address as the source. A real-world scenario: if the TFTP transfer is interrupted, the AP may fail to join the controller and fall back to a recovery mode, requiring manual intervention to retransmit the image.
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: TFTP — The correct answer is TFTP (Trivial File Transfer Protocol). Wireless LAN controllers (WLCs) use TFTP to push firmware images to lightweight access points (APs) because TFTP is lightweight, connectionless, and requires minimal memory and processing overhead on the AP. This makes it ideal for the simple, one-way file transfer of a firmware binary during the AP boot or upgrade process, where the AP acts as a TFTP client and the controller as the server.
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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Question Discussion
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