This 200-301 practice question tests your understanding of network services and security. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. A key principle to apply: nTP synchronizes device clocks by exchanging timestamped messages to maintain a consistent time reference across the network.. 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 protocol is most directly responsible for keeping device clocks synchronized across a network?
NTP
This is correct because NTP is used to synchronize clocks across devices.
TFTP
Why wrong: This is wrong because TFTP is a lightweight file transfer protocol, not a clock synchronization protocol.
DHCP
Why wrong: This is wrong because DHCP assigns network settings to clients but does not primarily synchronize clocks.
CDP
Why wrong: This is wrong because CDP is a neighbor discovery protocol, not a time service.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
NTP
The correct protocol is NTP. In plain language, NTP helps devices agree on the current time so that logs, authentication events, monitoring data, and troubleshooting records line up accurately. Without consistent time, a network team may see events from multiple devices but be unable to reconstruct the actual sequence correctly. This matters more than many people realize because accurate time underpins many operational workflows. Syslog messages, security events, and monitoring alerts become much easier to trust when devices are synchronized. DHCP, TFTP, and CDP are useful for other purposes, but they do not exist to align device clocks. NTP is the protocol specifically associated with time synchronization.
Key principle: NTP synchronizes device clocks by exchanging timestamped messages to maintain a consistent time reference across the network.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
NTP
TFTP
Why it's wrong here
This is wrong because TFTP is a lightweight file transfer protocol, not a clock synchronization protocol.
When this WOULD be correct
If the question were to ask which protocol is used for transferring files in a network environment, especially in scenarios where minimal overhead is desired, TFTP would be the correct answer. This could involve a question about lightweight file transfer methods in embedded systems.
DHCP
Why it's wrong here
This is wrong because DHCP assigns network settings to clients but does not primarily synchronize clocks.
When this WOULD be correct
In a question asking which protocol is responsible for providing network configuration settings, including IP addresses, subnet masks, and default gateways, DHCP would be the correct answer. For example, a question could ask about the protocol that dynamically assigns IP addresses to devices in a local area network.
CDP
Why it's wrong here
This is wrong because CDP is a neighbor discovery protocol, not a time service.
When this WOULD be correct
If the exam question asked which protocol is used for discovering and sharing information about network devices, particularly in a Cisco environment, then CDP would be the correct answer, as it facilitates device identification and topology mapping.
Option-by-option analysis
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The 200-301 exam frequently reuses these exact scenarios with slightly different constraints.
Why this is correct
This is correct because NTP is used to synchronize clocks across devices.
Why this is wrong here
TFTP is a lightweight file transfer protocol used for transferring configuration files and firmware images, typically for network device booting or backup. It does not provide any time synchronization functionality.
★ When this WOULD be the correct answer
If the question were to ask which protocol is used for transferring files in a network environment, especially in scenarios where minimal overhead is desired, TFTP would be the correct answer. This could involve a question about lightweight file transfer methods in embedded systems.
Why candidates choose this
Students may confuse TFTP with NTP due to the similar acronyms (both end in 'TP') and the fact that both are UDP-based protocols. However, their purposes are entirely different.
Why this is wrong here
DHCP primarily assigns IP addresses, subnet masks, default gateways, and other network configuration parameters to clients. While DHCP can optionally provide an NTP server address via option 42, it does not itself synchronize clocks.
★ When this WOULD be the correct answer
In a question asking which protocol is responsible for providing network configuration settings, including IP addresses, subnet masks, and default gateways, DHCP would be the correct answer. For example, a question could ask about the protocol that dynamically assigns IP addresses to devices in a local area network.
Why candidates choose this
Because DHCP can offer an NTP server address, some students might think DHCP directly synchronizes clocks. However, the actual synchronization is performed by NTP, not DHCP.
Why this is wrong here
CDP is a Cisco proprietary Layer 2 protocol used for discovering directly connected Cisco devices, including device type, IP address, and platform. It has no role in time synchronization.
★ When this WOULD be the correct answer
If the exam question asked which protocol is used for discovering and sharing information about network devices, particularly in a Cisco environment, then CDP would be the correct answer, as it facilitates device identification and topology mapping.
Why candidates choose this
Students might confuse CDP with NTP because both are commonly used in Cisco networks and both involve device communication. However, CDP is for neighbor discovery, not time sync.
Analysis generated from the official 200-301blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
Common exam traps
A frequent exam trap is selecting DHCP, TFTP, or CDP as the protocol responsible for clock synchronization. DHCP is often confused because it deals with network configuration, but it does not synchronize time. TFTP might seem relevant due to its role in transferring files like configurations, but it has no time-related function. CDP is a Cisco proprietary protocol for device discovery and neighbor information exchange, not for time services. Candidates must recognize that only NTP is designed specifically to keep device clocks synchronized across a network, which is critical for accurate logging and event correlation.
Detailed technical explanation
Network Time Protocol (NTP) is the standard protocol used to synchronize the clocks of devices across a network. It operates by exchanging timestamped messages between a client and a time server, allowing devices to adjust their internal clocks to a common reference time. Accurate time synchronization is critical for network operations, including logging, security event correlation, and troubleshooting. Cisco devices support NTP as a key IP service to maintain consistent time across routers, switches, and other network elements. When a Cisco device is configured as an NTP client, it queries one or more NTP servers to obtain the current time. The device then applies algorithms to filter and select the best time source, adjusting its clock gradually to avoid abrupt changes. This process ensures that all devices in the network share a synchronized time base, which is essential for time-sensitive protocols and accurate event sequencing. Other protocols like DHCP, TFTP, and CDP serve different purposes and do not provide time synchronization services. A common exam trap is confusing NTP with other network protocols that serve different functions. For example, DHCP assigns IP addresses and network parameters but does not synchronize time. TFTP is used for simple file transfers, such as configuration backups, and CDP discovers neighboring Cisco devices. Understanding the distinct role of NTP in time synchronization helps avoid this confusion and ensures correct protocol identification in exam scenarios and real-world network management.
Key takeaway
NTP synchronizes device clocks by exchanging timestamped messages to maintain a consistent time reference across the network.
Real-world example
A practitioner preparing for the 200-301 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. NTP synchronizes device clocks by exchanging timestamped messages to maintain a consistent time reference across the network. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Review nTP synchronizes device clocks by exchanging timestamped messages to maintain a consistent time reference across the network., then practise related 200-301 questions on the same topic to reinforce the concept.
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FAQ
Network Services and Security — This question tests Network Services and Security — NTP synchronizes device clocks by exchanging timestamped messages to maintain a consistent time reference across the network..
The correct answer is: NTP — The correct protocol is NTP. In plain language, NTP helps devices agree on the current time so that logs, authentication events, monitoring data, and troubleshooting records line up accurately. Without consistent time, a network team may see events from multiple devices but be unable to reconstruct the actual sequence correctly. This matters more than many people realize because accurate time underpins many operational workflows. Syslog messages, security events, and monitoring alerts become much easier to trust when devices are synchronized. DHCP, TFTP, and CDP are useful for other purposes, but they do not exist to align device clocks. NTP is the protocol specifically associated with time synchronization.
Review nTP synchronizes device clocks by exchanging timestamped messages to maintain a consistent time reference across the network., then practise related 200-301 questions on the same topic to reinforce the concept.
NTP synchronizes device clocks by exchanging timestamped messages to maintain a consistent time reference across the network.
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Last reviewed: May 17, 2026
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