Quick Answer
The correct answers are IPsec and SSL/TLS, as these are the two most common VPN security protocols used to establish encrypted tunnels for secure data transmission. IPsec operates at the network layer (Layer 3), encrypting entire IP packets to protect data in transit, making it ideal for site-to-site VPNs. SSL/TLS, on the other hand, works at the transport layer (Layer 4) and is typically used in SSL VPNs, leveraging port 443 to bypass firewalls and provide remote access through a web browser or lightweight client. On the ISC2 Certified in Cybersecurity CC exam, this question tests your understanding of foundational VPN technologies and their operational layers—a common trap is confusing IPsec with SSL/TLS or assuming only one method is correct. Remember the memory tip: IPsec secures the whole packet like a sealed envelope at Layer 3, while SSL/TLS secures only the payload like a locked briefcase at Layer 4.
This CC practice question tests your understanding of network security. 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.
Which two of the following are common methods to secure a virtual private network (VPN) connection? (Choose two.)
ICMP
Why wrong: ICMP is for diagnostics, not security.
LDAP
Why wrong: LDAP is for directory services, not a VPN protocol.
SSL/TLS
SSL/TLS is used for secure web-based VPNs.
SNMP
Why wrong: SNMP is for network management, not VPN security.
IPsec
IPsec is a common VPN protocol for secure site-to-site and remote access.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
SSL/TLS
SSL/TLS is a common method to secure VPN connections, typically used in SSL VPNs. It operates at the transport layer (Layer 4) and provides encryption, authentication, and integrity for data transmitted over the internet, often using port 443 to bypass firewalls. This makes it ideal for remote access VPNs where clients connect via a web browser or a lightweight client.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Common exam traps
ISC2 often tests the distinction between VPN security protocols (IPsec, SSL/TLS) and unrelated network protocols (ICMP, SNMP, LDAP) to see if candidates confuse management or authentication protocols with encryption/tunneling mechanisms.
Detailed technical explanation
SSL/TLS VPNs use the TLS handshake to negotiate encryption keys and authenticate the server (and optionally the client) using certificates. In contrast, IPsec operates at the network layer (Layer 3) and can be used in tunnel mode to encapsulate entire IP packets, often requiring more complex configuration. A real-world scenario: SSL/TLS VPNs are preferred for clientless remote access (e.g., via a browser), while IPsec is commonly used for site-to-site VPNs between routers or firewalls.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A developer is choosing between AES-256 (symmetric) and RSA-2048 (asymmetric) for encrypting a large file that will be sent to a partner. Symmetric encryption is fast but requires key exchange; asymmetric is slower but solves the key distribution problem. A hybrid approach — encrypt the file with AES, encrypt the AES key with RSA — is standard. Questions like this test whether you understand when each approach applies.
What to study next
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FAQ
Network Security — This question tests Network Security — Read the scenario before looking for a memorised answer..
The correct answer is: SSL/TLS — SSL/TLS is a common method to secure VPN connections, typically used in SSL VPNs. It operates at the transport layer (Layer 4) and provides encryption, authentication, and integrity for data transmitted over the internet, often using port 443 to bypass firewalls. This makes it ideal for remote access VPNs where clients connect via a web browser or a lightweight client.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 30, 2026
This CC practice question is part of Courseiva's free ISC2 certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the CC exam.
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