The answer is to enable STARTTLS on the SMTP server to encrypt connections. This works by upgrading a plaintext SMTP session to an encrypted TLS tunnel on the same standard port (25 or 587), as defined in RFC 3207, ensuring email traffic is encrypted in transit without needing a separate port or protocol. On the LPIC-2 exam, this tests your understanding of securing mail services under Objective 210.1, where a common trap is confusing STARTTLS with SMTPS (which uses a dedicated port like 465) or assuming encryption is automatic on port 25. Remember the key distinction: STARTTLS negotiates encryption on the existing connection, while SMTPS requires a separate port. For the exam, think “STARTTLS = Start with plain, then TLS on the same port” to avoid the trap of selecting a dedicated encrypted port.
LPIC-2 System Security Practice Question
This LPIC-2 practice question tests your understanding of system security. Compare every option against the stated constraints before choosing — the best answer satisfies all requirements, not just the most obvious one. 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.
An organization requires that all email traffic from their mail server must be encrypted in transit. Which of the following is the most appropriate solution?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Enable STARTTLS on the SMTP server to encrypt connections.
STARTTLS is the standard method for upgrading a plaintext SMTP connection to an encrypted one using TLS, as defined in RFC 3207. It allows the mail server to negotiate encryption on the standard SMTP port (25) or submission port (587), ensuring that email traffic is encrypted in transit without requiring a separate port or protocol. This is the most appropriate solution because it is widely supported, interoperable, and aligns with modern email security best practices.
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.
✗
Implement IPsec to encrypt all traffic between mail servers.
Why it's wrong here
IPsec can be used but is more complex and not specific to email.
✗
Use SMTPS (SMTP over SSL) on port 465.
Why it's wrong here
SMTPS is deprecated; STARTTLS is the standard.
✗
Configure the mail server to use SSH tunneling for all SMTP connections.
Why it's wrong here
SSH tunneling is not standard for email transport.
✓
Enable STARTTLS on the SMTP server to encrypt connections.
Why this is correct
STARTTLS upgrades plain SMTP to encrypted using TLS.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse SMTPS (port 465) with STARTTLS, believing that using a dedicated SSL port is more secure, when in fact STARTTLS is the modern, standardized approach that allows encryption on standard ports and is required for compliance with many security frameworks.
Detailed technical explanation
How to think about this question
STARTTLS works by sending an EHLO command to the SMTP server, which responds with a list of supported extensions including 'STARTTLS'. The client then issues the STARTTLS command, and both sides negotiate a TLS handshake over the existing TCP connection. A common subtlety is that STARTTLS is vulnerable to downgrade attacks if the server does not enforce TLS via mechanisms like MTA-STS (RFC 8461) or DANE (RFC 7672), which can prevent man-in-the-middle stripping of the STARTTLS advertisement.
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 LPIC-2 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.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
System Security — This question tests System Security — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Enable STARTTLS on the SMTP server to encrypt connections. — STARTTLS is the standard method for upgrading a plaintext SMTP connection to an encrypted one using TLS, as defined in RFC 3207. It allows the mail server to negotiate encryption on the standard SMTP port (25) or submission port (587), ensuring that email traffic is encrypted in transit without requiring a separate port or protocol. This is the most appropriate solution because it is widely supported, interoperable, and aligns with modern email security best practices.
What should I do if I get this LPIC-2 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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