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CCNA Network Services and Security Practice Question
This 200-301 practice question tests your understanding of network services and 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.
Which four of the following are characteristics or configuration requirements of NTP client/server operation in a secure enterprise network? (Choose all that apply. There are four correct answers.)
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
✓
An NTP client can synchronize time with multiple NTP servers for redundancy.
NTP clients can synchronize with multiple servers to provide redundancy and improve accuracy through algorithms like Marzullo's algorithm. NTP uses UDP port 123 for all communication, as specified in RFC 5905. NTP authentication (using symmetric keys or MD5 hashes) ensures that time updates originate from a trusted source, preventing spoofing attacks. The stratum level indicates the distance from the primary reference clock; a lower stratum number (e.g., 1) is closer to the authoritative time source and thus more accurate.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the misconception that NTP requires same-subnet connectivity or that a Cisco router can automatically become stratum 1, when in fact NTP works across routed networks and stratum 1 requires a dedicated reference clock.
Detailed technical explanation
How to think about this question
NTP uses a hierarchical system of stratum levels, where stratum 0 is the reference clock (e.g., atomic clock) and stratum 1 servers are directly connected to it. Clients can be configured with multiple server IPs using the 'ntp server' command; the client then selects the best time source based on stratum, offset, and jitter. NTP authentication is configured with 'ntp authenticate', 'ntp authentication-key', and 'ntp trusted-key' commands to prevent man-in-the-middle attacks. In real-world enterprise networks, NTP is critical for log correlation, certificate validation, and Kerberos authentication.
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 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.
What to study next
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FAQ
Questions learners often ask
What does this 200-301 question test?
Network Services and Security — This question tests Network Services and Security — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: An NTP client can synchronize time with multiple NTP servers for redundancy. — NTP clients can synchronize with multiple servers to provide redundancy and improve accuracy through algorithms like Marzullo's algorithm. NTP uses UDP port 123 for all communication, as specified in RFC 5905. NTP authentication (using symmetric keys or MD5 hashes) ensures that time updates originate from a trusted source, preventing spoofing attacks. The stratum level indicates the distance from the primary reference clock; a lower stratum number (e.g., 1) is closer to the authoritative time source and thus more accurate.
What should I do if I get this 200-301 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
This 200-301 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 200-301 exam.
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