IPsec is the correct choice because it is specifically designed for site-to-site VPNs, providing encryption and authentication at the IP layer to create a secure tunnel between two networks. This allows the branch office to access internal resources at headquarters as if they were directly connected, using a gateway-to-gateway model that encrypts all traffic between the sites. On the CompTIA Network+ N10-009 exam, this scenario tests your understanding of VPN types and their appropriate use cases—IPsec is the go-to for permanent, encrypted site-to-site links, while SSL or client-based VPNs are better for remote user access. A common trap is confusing IPsec with GRE tunnels, but remember that GRE offers no encryption on its own. For a quick memory tip, think “IPsec for site-to-site, SSL for remote access.”
N10-009 Network Implementation Practice Question
This N10-009 practice question tests your understanding of network implementation. 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 administrator is setting up a new branch office that will connect to the main headquarters over the Internet. The connection must be encrypted and allow the branch to access internal resources as if they were directly connected. Which of the following VPN types is BEST suited for this site-to-site connection?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
IPsec (Internet Protocol Security) is designed for site-to-site VPNs and offers strong encryption and authentication. It is widely used for branch connections.
B
SSL VPN
Why wrong: SSL VPN is primarily for client-to-site remote access, not for permanent site-to-site links. It often runs over HTTPS and may not provide the same performance as IPsec for site-to-site.
C
PPTP
Why wrong: PPTP is an older protocol with known security vulnerabilities and is not recommended for secure site-to-site connectivity.
D
L2TP
Why wrong: L2TP alone does not provide encryption; it is often used with IPsec (L2TP/IPsec). By itself, it is not sufficient for a secure site-to-site VPN.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
IPsec
IPsec is the correct choice because it is specifically designed for site-to-site VPNs, providing encryption and authentication at the IP layer to create a secure tunnel between two networks. This allows the branch office to access internal resources at headquarters as if they were directly connected, using a gateway-to-gateway model that encrypts all traffic between the sites.
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.
✓
IPsec
Why this is correct
IPsec (Internet Protocol Security) is designed for site-to-site VPNs and offers strong encryption and authentication. It is widely used for branch connections.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
SSL VPN
Why it's wrong here
SSLVPN is primarily for client-to-site remote access, not for permanent site-to-site links. It often runs over HTTPS and may not provide the same performance as IPsec for site-to-site.
✗
PPTP
Why it's wrong here
PPTP is an older protocol with known security vulnerabilities and is not recommended for secure site-to-site connectivity.
✗
L2TP
Why it's wrong here
L2TP alone does not provide encryption; it is often used with IPsec (L2TP/IPsec). By itself, it is not sufficient for a secure site-to-site VPN.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between remote-access VPNs (SSLVPN) and site-to-site VPNs (IPsec), where candidates mistakenly choose SSL VPN because it is commonly used for client-based access, but it lacks the full network-layer bridging required for a branch office to appear directly connected.
Detailed technical explanation
How to think about this question
IPsec site-to-site VPNs use IKE (Internet Key Exchange) to negotiate security associations (SAs) and establish a tunnel in two phases: Phase 1 (main or aggressive mode) for ISAKMP SA, and Phase 2 (quick mode) for IPsec SA. The tunnel encapsulates original IP packets with an ESP (Encapsulating Security Payload) header, providing confidentiality, integrity, and anti-replay protection, and can operate in tunnel mode (entire packet encrypted) or transport mode (payload only).
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 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: IPsec — IPsec is the correct choice because it is specifically designed for site-to-site VPNs, providing encryption and authentication at the IP layer to create a secure tunnel between two networks. This allows the branch office to access internal resources at headquarters as if they were directly connected, using a gateway-to-gateway model that encrypts all traffic between the sites.
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: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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