Quick Answer
IPsec with IKEv2 is the best practice for site-to-site VPNs because it delivers robust authentication, encryption, and integrity verification for all traffic between two fixed network endpoints. IKEv2 improves upon its predecessor by offering built-in mobility support, faster rekeying, and inherent resistance to Denial-of-Service attacks, making it the preferred protocol for persistent, secure site-to-site connections over the internet. On the Systems Security Certified Practitioner SSCP exam, this concept tests your understanding of secure network architecture and protocol selection; a common trap is confusing IKEv1 with IKEv2 or assuming SSL/TLS is appropriate for site-to-site links. Remember that IKEv2 is the modern standard for fixed-site tunnels, while IKEv1 is considered legacy. A helpful memory tip: think of the “2” in IKEv2 as standing for “two-way, tough, and trustworthy” for site-to-site security.
This SSCP practice question tests your understanding of network and communications 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.
A remote employee needs secure access to corporate resources over the internet. Which protocol is considered best practice for site-to-site VPN?
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 with IKEv2
IPsec/IKEv2 is a secure standard for site-to-site VPNs.
PPTP (Point-to-Point Tunneling Protocol)
Why wrong: PPTP is insecure and should not be used.
SSL VPN (Secure Sockets Layer VPN)
Why wrong: SSL VPN is designed for remote client access, not site-to-site.
L2TP (Layer 2 Tunneling Protocol) without IPsec
Why wrong: L2TP alone provides no encryption.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
IPsec with IKEv2
IPsec with IKEv2 (Internet Key Exchange version 2) is the best practice for site-to-site VPNs because it provides strong authentication, encryption, and integrity checking for all traffic between two fixed endpoints. IKEv2 offers built-in mobility, faster rekeying, and resistance to Denial-of-Service attacks compared to IKEv1, making it the recommended choice for secure, persistent site-to-site connections over the internet.
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.
IPsec with IKEv2
Why this is correct
IPsec/IKEv2 is a secure standard for site-to-site VPNs.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
PPTP (Point-to-Point Tunneling Protocol)
Why it's wrong here
PPTP is insecure and should not be used.
SSL VPN (Secure Sockets Layer VPN)
L2TP (Layer 2 Tunneling Protocol) without IPsec
Why it's wrong here
L2TP alone provides no encryption.
Common exam traps
The trap here is that candidates often confuse SSL VPN (which is for remote access) with site-to-site VPN requirements, or they mistakenly think L2TP alone provides security, when in fact L2TP must be paired with IPsec to be secure.
Detailed technical explanation
IKEv2 (RFC 7296) uses a two-phase process: Phase 1 establishes a secure authenticated channel using Diffie-Hellman key exchange and certificates or pre-shared keys, while Phase 2 negotiates IPsec Security Associations (SAs) for data traffic. A subtle behavior is that IKEv2 supports 'MOBIKE' (Mobility and Multihoming) which allows the VPN to survive IP address changes without re-establishing the tunnel, though this is more relevant for remote access than traditional site-to-site. In a real-world scenario, a company connecting two branch offices over the internet would configure IPsec with IKEv2 on their edge routers, using AES-256 encryption and SHA-256 hashing to ensure confidentiality and integrity of all inter-site traffic.
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
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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FAQ
Network and Communications Security — This question tests Network and Communications Security — Read the scenario before looking for a memorised answer..
The correct answer is: IPsec with IKEv2 — IPsec with IKEv2 (Internet Key Exchange version 2) is the best practice for site-to-site VPNs because it provides strong authentication, encryption, and integrity checking for all traffic between two fixed endpoints. IKEv2 offers built-in mobility, faster rekeying, and resistance to Denial-of-Service attacks compared to IKEv1, making it the recommended choice for secure, persistent site-to-site connections over the internet.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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.
Read the scenario before looking for a memorised answer.
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Same concept, more angles
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Variation 1. An organization wants to allow secure remote access for employees. Which protocol is most appropriate for a site-to-site VPN?
easyWhy C: IPsec is the correct choice for a site-to-site VPN because it operates at the network layer (Layer 3), providing encryption and authentication for all IP traffic between two entire networks. It supports both tunnel and transport modes, and uses protocols like ESP (Encapsulating Security Payload) and AH (Authentication Header) to ensure confidentiality, integrity, and origin authentication, making it the standard for permanent site-to-site connections.
Last reviewed: Jun 25, 2026
This SSCP 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 SSCP exam.
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