The answer is that this configuration creates a VTI (Virtual Tunnel Interface) that encrypts all traffic routed into the tunnel using IPsec. This is correct because the tunnel mode ipsec ipv4 command enables IPsec encapsulation of IPv4 packets, while the tunnel protection ipsec profile MYPROFILE directive binds a specific IPsec profile to the tunnel, ensuring that any traffic entering the interface is automatically encrypted and sent to the remote peer at 192.168.1.1. On the ENCOR 350-401 exam, this tests your understanding of site-to-site VPN architectures and the distinction between VTI-based and crypto-map-based IPsec configurations; a common trap is confusing VTI with GRE tunnels, which do not inherently provide encryption. Remember the memory tip: "VTI means Virtual Tunnel IPsec—if you see tunnel mode ipsec ipv4, think 'encrypt everything inside'."
350-401 VPN Technologies Practice Question
This 350-401 practice question tests your understanding of vpn technologies. 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.
Given the following configuration on a Cisco IOS-XE router:
interface Tunnel100
ip address 10.0.0.1 255.255.255.252
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
It creates a VTI (Virtual Tunnel Interface) that encrypts all traffic routed into the tunnel using IPsec.
This configuration creates a point-to-point tunnel interface that uses IPsec to encrypt traffic between the local router and the remote peer at 192.168.1.1. The tunnel mode ipsec ipv4 enables IPsec encapsulation of IPv4 packets, and the tunnel protection command applies an IPsec profile for encryption.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
It creates a GRE tunnel with IPsec encryption.
Why it's wrong here
GRE tunnels use tunnel mode gre ip, not tunnel mode ipsec ipv4. The mode ipsec ipv4 is used for VTI (Virtual Tunnel Interface) tunnels.
✓
It creates a VTI (Virtual Tunnel Interface) that encrypts all traffic routed into the tunnel using IPsec.
Why this is correct
The tunnel mode ipsec ipv4 creates a static VTI, which encrypts any traffic sent to the tunnel interface using the referenced IPsec profile.
Related concept
Static NAT maps one inside address to one outside address.
✗
It creates a DMVPN phase 1 tunnel with mGRE.
Why it's wrong here
DMVPN uses mGRE (tunnel mode gre multipoint) and NHRP, not tunnel mode ipsec ipv4.
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
How this comes up in practice
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this 350-401 question in full detail.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related 350-401 NAT questions on configuration and troubleshooting.
VPN Technologies — This question tests VPN Technologies — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: It creates a VTI (Virtual Tunnel Interface) that encrypts all traffic routed into the tunnel using IPsec. — This configuration creates a point-to-point tunnel interface that uses IPsec to encrypt traffic between the local router and the remote peer at 192.168.1.1. The tunnel mode ipsec ipv4 enables IPsec encapsulation of IPv4 packets, and the tunnel protection command applies an IPsec profile for encryption.
What should I do if I get this 350-401 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related 350-401 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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