350-501 Security and Services Practice Question
To secure NTP in a service provider network, which feature should be enabled on IOS XR routers to prevent time synchronization with unauthorized NTP servers?
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
✓
NTP authentication with MD5 keys
NTP authentication ensures that the router only synchronizes with trusted servers that have the correct key. Access lists can also limit, but authentication provides cryptographic verification. NTP broadcast mode is less secure; symmetric mode is for peer-to-peer.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
NTP authentication with MD5 keys
Why this is correct
Authentication verifies the identity of the NTP server.
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NTP symmetric active mode
Why it's wrong here
Symmetric mode is for peering, not security.
- ✗
NTP broadcast client mode
Why it's wrong here
Broadcast mode does not authenticate the server.
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NTP access group with read-only community
Why it's wrong here
Access groups restrict access but do not authenticate.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 350-501 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 350-501 exam.