- A
Two VPN tunnels in active/passive mode
Why wrong: Active/passive means one tunnel is not always active.
- B
Two VPN tunnels with static routing
Why wrong: Static routing is less flexible than dynamic routing for failover.
- C
One VPN tunnel with static routing
Why wrong: A single tunnel lacks redundancy.
- D
Two VPN tunnels in active/active mode with BGP
Active/active tunnels with BGP provide high availability and always-on connectivity.
Question 104 of 1,705
ANS-C01 Network Implementation Practice Question
This ANS-C01 practice question tests your understanding of network implementation. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 company is implementing a hybrid network using AWS Site-to-Site VPN. The on-premises firewall requires that the VPN tunnels use IKEv2 with pre-shared keys and that the tunnels are always active. Which VPN configuration should be used?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"always"Why it matters: Absolute qualifier. An answer using 'always' is only correct if there are genuinely no exceptions — absolute statements are often wrong in networking.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Two VPN tunnels in active/active mode with BGP
Option D is correct because IKEv2 with pre-shared keys and always-active tunnels require both tunnels to be in active/active mode, which is achieved by using BGP to advertise the same routes over both tunnels. BGP enables dynamic routing and ensures both tunnels are used simultaneously, meeting the requirement for continuous active connectivity.
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.
- ✗
Two VPN tunnels in active/passive mode
Why it's wrong here
Active/passive means one tunnel is not always active.
- ✗
Two VPN tunnels with static routing
Why it's wrong here
Static routing is less flexible than dynamic routing for failover.
- ✗
One VPN tunnel with static routing
Why it's wrong here
A single tunnel lacks redundancy.
- ✓
Two VPN tunnels in active/active mode with BGP
Why this is correct
Active/active tunnels with BGP provide high availability and always-on connectivity.
Clue confirmation
The clue word "always" in the question point toward this answer.
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 assume active/passive mode is required for redundancy, but the question explicitly states 'tunnels are always active,' which mandates active/active mode with BGP to keep both tunnels up and forwarding traffic simultaneously.
Detailed technical explanation
How to think about this question
In AWS Site-to-Site VPN, active/active mode with BGP uses two tunnels that are both up simultaneously, each with its own BGP session. The on-premises router must be configured to establish BGP peering with both AWS endpoints, and the BGP timers (e.g., keepalive 10s, hold 30s) ensure fast convergence. This setup is compliant with RFC 7296 for IKEv2 and allows load balancing or equal-cost multipath (ECMP) routing across the two tunnels.
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 healthcare organisation deploys an application with a public-facing web tier and a private database tier. The database subnet has no public IP and only accepts connections from the web tier's security group. Questions like this test whether you can design cloud network isolation using VNets/VPCs, subnets, and security group rules.
Quick reference
VPN Protocol Comparison
| Protocol | Port | Encryption | Authentication | Use Case |
|---|---|---|---|---|
| IKEv2 / IPsec | UDP 500 / 4500 | AES-256 | Certificates / PSK | Site-to-site & remote access |
| SSL / TLS VPN | TCP 443 | TLS 1.3 | Certificates / MFA | Clientless remote access |
| L2TP / IPsec | UDP 1701 | AES (IPsec) | PSK / Certificates | Legacy remote access |
| WireGuard | UDP 51820 | ChaCha20 | Public keys | Modern high-performance VPN |
| PPTP | TCP 1723 | MPPE (weak) | MS-CHAPv2 | Legacy — avoid in production |
PPTP is considered insecure. IKEv2/IPsec and SSL VPN are the current recommended options.
What to study next
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FAQ
Questions learners often ask
What does this ANS-C01 question test?
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: Two VPN tunnels in active/active mode with BGP — Option D is correct because IKEv2 with pre-shared keys and always-active tunnels require both tunnels to be in active/active mode, which is achieved by using BGP to advertise the same routes over both tunnels. BGP enables dynamic routing and ensures both tunnels are used simultaneously, meeting the requirement for continuous active connectivity.
What should I do if I get this ANS-C01 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: "always". Absolute qualifier. An answer using 'always' is only correct if there are genuinely no exceptions — absolute statements are often wrong in networking.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
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