SCAZT User And Device Security Practice Question
How does Duo protect an application that does not support modern authentication protocols?
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
✓
By using the Authentication Proxy to perform RADIUS/LDAP validation
Duo uses the Authentication Proxy to wrap or intercept traffic (like RADIUS) and force an MFA prompt.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
By installing a local agent on the cloud application server
Why it's wrong here
Cloud applications usually do not allow agent installation.
- ✓
By using the Authentication Proxy to perform RADIUS/LDAP validation
Why this is correct
This is the classic way to protect legacy systems.
- ✗
By redirecting the user to a SAML 2.0 gateway
Why it's wrong here
If the app doesn't support modern auth, it won't support SAML redirects.
- ✗
By forcing the user to use a VPN
Why it's wrong here
VPN is a transport layer solution, not an authentication protocol bridge.
Quick reference
AAA Protocol Comparison
| Protocol | Port(s) | Encryption | Transport | Primary Use |
|---|---|---|---|---|
| RADIUS | 1812 / 1813 | Password only | UDP | Network access control |
| TACACS+ | 49 | Full packet | TCP | Device administration |
| Diameter | 3868 | Full session | TCP / SCTP | Carrier / mobile networks |
| 802.1X | — | EAP-based | Layer 2 | Port-based access control |
TACACS+ encrypts the entire packet; RADIUS only encrypts the password field — a key exam distinction.
About these practice questions
One of 316 original SCAZT practice questions on Courseiva, each with a full explanation and wrong-answer analysis — not exam dumps or protected exam content. Learn why practice questions differ from exam dumps →
JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed August 2026 · checked against the official Cisco exam blueprint
This SCAZT 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 SCAZT exam.