- A
A crypto map applied to the physical interface.
Why wrong: Incorrect. For VTI, the crypto map is applied to the tunnel interface, not the physical interface.
- B
A tunnel interface with an IP address and a crypto map.
Correct. VTI requires a tunnel interface with an assigned IP address and a crypto map applied to it.
- C
A transform set with ESP encryption and authentication.
Why wrong: Incorrect. Transform set is part of IPsec, but VTI requires tunnel interface and crypto map.
- D
An ISAKMP policy with pre-shared key.
Why wrong: Incorrect. ISAKMP policy is needed for IKE phase 1, but not specific to VTI.
Question 940 of 988
350-701 Network Security Practice Question
This 350-701 practice question tests your understanding of network security. 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 network administrator is configuring site-to-site IPsec VPN between two Cisco ASAs using IKEv2. They want to ensure that only specific subnets are encrypted, using Virtual Tunnel Interface (VTI). Which configuration element is essential for VTI?
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
✓
A tunnel interface with an IP address and a crypto map.
VTI uses a tunnel interface that is dedicated to the VPN, and the crypto map is applied to the tunnel interface rather than the physical interface. For IKEv2, the tunnel mode is enabled and the crypto map is applied to the VTI.
Key principle: Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
A crypto map applied to the physical interface.
Why it's wrong here
Incorrect. For VTI, the crypto map is applied to the tunnel interface, not the physical interface.
- ✓
A tunnel interface with an IP address and a crypto map.
Why this is correct
Correct. VTI requires a tunnel interface with an assigned IP address and a crypto map applied to it.
Related concept
CIDR notation defines the prefix length.
- ✗
A transform set with ESP encryption and authentication.
Why it's wrong here
Incorrect. Transform set is part of IPsec, but VTI requires tunnel interface and crypto map.
- ✗
An ISAKMP policy with pre-shared key.
Why it's wrong here
Incorrect. ISAKMP policy is needed for IKE phase 1, but not specific to VTI.
Common exam traps
Common exam trap: usable hosts are not the same as total addresses
Subnetting questions often tempt you into counting all addresses. In normal IPv4 subnets, the network and broadcast addresses are not usable host addresses.
Detailed technical explanation
How to think about this question
Subnetting questions test whether you can identify the network, broadcast address, usable range, mask and correct subnet. Slow down enough to calculate the block size correctly.
KKey Concepts to Remember
- CIDR notation defines the prefix length.
- Block size helps identify subnet boundaries.
- Network and broadcast addresses are not usable hosts in normal IPv4 subnets.
- The required host count determines the smallest suitable subnet.
TExam Day Tips
- Write the block size before choosing the subnet.
- Check whether the question asks for hosts, subnets or a specific address range.
- Do not confuse /24, /25, /26 and /27 host counts.
Key takeaway
Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
Real-world example
How this comes up in practice
A network engineer segments a warehouse floor into three subnets: 20 scanners, 5 printers, and 2 management hosts. Picking the wrong mask wastes addresses or leaves too few usable hosts. Exam questions test whether you can apply CIDR notation, calculate block size, and identify the correct usable-host range for a given prefix.
Visual reference
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
Got this wrong? Here's your next step.
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related 350-701 subnetting questions on CIDR, address ranges, and subnet selection.
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FAQ
Questions learners often ask
What does this 350-701 question test?
Network Security — This question tests Network Security — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: A tunnel interface with an IP address and a crypto map. — VTI uses a tunnel interface that is dedicated to the VPN, and the crypto map is applied to the tunnel interface rather than the physical interface. For IKEv2, the tunnel mode is enabled and the crypto map is applied to the VTI.
What should I do if I get this 350-701 question wrong?
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related 350-701 subnetting questions on CIDR, address ranges, and subnet selection.
What is the key concept behind this question?
CIDR notation defines the prefix length.
About these practice questions
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Last reviewed: Jul 4, 2026
This 350-701 practice question is part of Courseiva's free Cisco 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 350-701 exam.
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