- A
Use 'show ntp status' to verify synchronization, 'clock set' to update the system clock, and configure 'ntp master' and 'ntp broadcast' on the interface facing 192.168.1.0/24.
This is correct because 'show ntp status' displays synchronization status, 'clock set' manually updates the system clock if needed, 'ntp master' enables R1 to act as an NTP server, and 'ntp broadcast' sends NTP broadcasts on the specified interface for downstream clients.
- B
Use 'show ntp associations' to verify synchronization, 'clock update' to update the system clock, and configure 'ntp server' and 'ntp broadcast' on the interface facing 192.168.1.0/24.
Why wrong: This is incorrect because 'clock update' is not a valid Cisco IOS command; the correct command is 'clock set'. Additionally, 'ntp server' is used to configure the router as a client, not as a server for downstream devices.
- C
Use 'show ntp status' to verify synchronization, 'clock set' to update the system clock, and configure 'ntp server' and 'ntp broadcast' on the interface facing 192.168.1.0/24.
Why wrong: This is incorrect because 'ntp server' is used to configure the router as an NTP client, not as a server. To make R1 act as an NTP server, the command 'ntp master' is required.
- D
Use 'show ntp associations' to verify synchronization, 'clock set' to update the system clock, and configure 'ntp master' and 'ntp broadcast' on the interface facing 192.168.1.0/24.
Why wrong: This is incorrect because 'show ntp associations' shows NTP associations but does not directly indicate synchronization status. The correct command to verify synchronization is 'show ntp status', which includes stratum level and synchronization state.
Quick Answer
The correct answer is to use 'show ntp status' for verification, 'clock set' to update the system clock if needed, and configure 'ntp master' along with 'ntp broadcast' on the interface facing 192.168.1.0/24. This is correct because 'show ntp status' reveals the synchronization state and stratum level, confirming the router is syncing with the NTP server at 203.0.113.1, while 'ntp master' designates R1 as an authoritative time source for downstream devices, and 'ntp broadcast' enables unsolicited time updates on the internal subnet. On the CCNA 200-301 v2 exam, this question tests your ability to distinguish between NTP client and server roles, with a common trap being the misuse of 'ntp server' (which makes the router a client) instead of 'ntp master'. Remember that 'show ntp associations' only shows configured peers, not sync status, and 'clock update' is not a valid IOS command. Memory tip: "Master broadcasts, server listens" — 'ntp master' makes the router a source, while 'ntp server' makes it a client.
CCNA Network Services and Security Practice Question
This 200-301 practice question tests your understanding of network services and security. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. 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.
You are connected to R1 via the console. R1 is configured as an NTP client that should synchronize with the NTP server at 203.0.113.1. You need to verify that R1 is synchronizing correctly and also ensure that the system clock is updated. Additionally, configure R1 to act as an NTP server for downstream devices on the internal network 192.168.1.0/24.
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
Use 'show ntp status' to verify synchronization, 'clock set' to update the system clock, and configure 'ntp master' and 'ntp broadcast' on the interface facing 192.168.1.0/24.
The correct verification command is 'show ntp status' because it displays the synchronization state and stratum level. 'show ntp associations' shows configured peers but not the sync state. After NTP sync is established, the system clock is automatically updated; 'clock set' is not typically required but remains a valid command to manually adjust the clock. 'clock update' is not a valid IOS command. To make R1 an NTP server for downstream devices, use the global command 'ntp master 4', not 'ntp server' (which makes the router a client). Then, on the interface facing 192.168.1.0/24 (G0/0), apply 'ntp broadcast' to send NTP broadcasts so clients can synchronize without polling. Option A correctly combines these steps while other options mix incorrect commands or verification methods.
Key principle: Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Use 'show ntp status' to verify synchronization, 'clock set' to update the system clock, and configure 'ntp master' and 'ntp broadcast' on the interface facing 192.168.1.0/24.
Why this is correct
This is correct because 'show ntp status' displays synchronization status, 'clock set' manually updates the system clock if needed, 'ntp master' enables R1 to act as an NTP server, and 'ntp broadcast' sends NTP broadcasts on the specified interface for downstream clients.
Related concept
CIDR notation defines the prefix length.
- ✗
Use 'show ntp associations' to verify synchronization, 'clock update' to update the system clock, and configure 'ntp server' and 'ntp broadcast' on the interface facing 192.168.1.0/24.
Why it's wrong here
This is incorrect because 'clock update' is not a valid Cisco IOS command; the correct command is 'clock set'. Additionally, 'ntp server' is used to configure the router as a client, not as a server for downstream devices.
- ✗
Use 'show ntp status' to verify synchronization, 'clock set' to update the system clock, and configure 'ntp server' and 'ntp broadcast' on the interface facing 192.168.1.0/24.
Why it's wrong here
This is incorrect because 'ntp server' is used to configure the router as an NTP client, not as a server. To make R1 act as an NTP server, the command 'ntp master' is required.
- ✗
Use 'show ntp associations' to verify synchronization, 'clock set' to update the system clock, and configure 'ntp master' and 'ntp broadcast' on the interface facing 192.168.1.0/24.
Why it's wrong here
This is incorrect because 'show ntp associations' shows NTP associations but does not directly indicate synchronization status. The correct command to verify synchronization is 'show ntp status', which includes stratum level and synchronization state.
Option-by-option analysis
Why each answer is right or wrong
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.
✓Use 'show ntp status' to verify synchronization, 'clock set' to update the system clock, and configure 'ntp master' and 'ntp broadcast' on the interface facing 192.168.1.0/24.Correct answer▾
Why this is correct
This is correct because 'show ntp status' displays synchronization status, 'clock set' manually updates the system clock if needed, 'ntp master' enables R1 to act as an NTP server, and 'ntp broadcast' sends NTP broadcasts on the specified interface for downstream clients.
✗Use 'show ntp associations' to verify synchronization, 'clock update' to update the system clock, and configure 'ntp server' and 'ntp broadcast' on the interface facing 192.168.1.0/24.Wrong answer — click to see why▾
Why this is wrong here
The specific factual error: 'clock update' is not a valid command; the correct command is 'clock set'. Also, 'ntp server' configures the router as a client, not a server.
Why candidates choose this
Candidates might think 'clock update' is a valid command and confuse 'ntp server' with 'ntp master'.
✗Use 'show ntp status' to verify synchronization, 'clock set' to update the system clock, and configure 'ntp server' and 'ntp broadcast' on the interface facing 192.168.1.0/24.Wrong answer — click to see why▾
Why this is wrong here
The specific factual error: 'ntp server' configures the router as a client, not a server. The correct command to act as a server is 'ntp master'.
Why candidates choose this
Candidates may assume 'ntp server' makes the router a server, but it actually points to an upstream server.
✗Use 'show ntp associations' to verify synchronization, 'clock set' to update the system clock, and configure 'ntp master' and 'ntp broadcast' on the interface facing 192.168.1.0/24.Wrong answer — click to see why▾
Why this is wrong here
The specific factual error: 'show ntp associations' does not show synchronization status; 'show ntp status' is the appropriate command.
Why candidates choose this
Candidates often confuse 'show ntp associations' with 'show ntp status' because both relate to NTP, but only 'show ntp status' provides synchronization details.
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
Common exam trap: usable hosts are not the same as total addresses
Subnetting questions often tempt you into counting all addresses. In normal IPv4 subnets, the network and broadcast addresses are not usable host addresses.
Trap categories for this question
Command / output trap
This is incorrect because 'clock update' is not a valid Cisco IOS command; the correct command is 'clock set'. Additionally, 'ntp server' is used to configure the router as a client, not as a server for downstream devices.
Detailed technical explanation
How to think about this question
Subnetting questions test whether you can identify the network, broadcast address, usable range, mask and correct subnet. Slow down enough to calculate the block size correctly.
KKey Concepts to Remember
- CIDR notation defines the prefix length.
- Block size helps identify subnet boundaries.
- Network and broadcast addresses are not usable hosts in normal IPv4 subnets.
- The required host count determines the smallest suitable subnet.
TExam Day Tips
- Write the block size before choosing the subnet.
- Check whether the question asks for hosts, subnets or a specific address range.
- Do not confuse /24, /25, /26 and /27 host counts.
Key takeaway
Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
Real-world example
How this comes up in practice
A network engineer segments a warehouse floor into three subnets: 20 scanners, 5 printers, and 2 management hosts. Picking the wrong mask wastes addresses or leaves too few usable hosts. Exam questions test whether you can apply CIDR notation, calculate block size, and identify the correct usable-host range for a given prefix.
What to study next
Got this wrong? Here's your next step.
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related 200-301 subnetting questions on CIDR, address ranges, and subnet selection.
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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 — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: Use 'show ntp status' to verify synchronization, 'clock set' to update the system clock, and configure 'ntp master' and 'ntp broadcast' on the interface facing 192.168.1.0/24. — The correct verification command is 'show ntp status' because it displays the synchronization state and stratum level. 'show ntp associations' shows configured peers but not the sync state. After NTP sync is established, the system clock is automatically updated; 'clock set' is not typically required but remains a valid command to manually adjust the clock. 'clock update' is not a valid IOS command. To make R1 an NTP server for downstream devices, use the global command 'ntp master 4', not 'ntp server' (which makes the router a client). Then, on the interface facing 192.168.1.0/24 (G0/0), apply 'ntp broadcast' to send NTP broadcasts so clients can synchronize without polling. Option A correctly combines these steps while other options mix incorrect commands or verification methods.
What should I do if I get this 200-301 question wrong?
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related 200-301 subnetting questions on CIDR, address ranges, and subnet selection.
What is the key concept behind this question?
CIDR notation defines the prefix length.
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Last reviewed: Jun 7, 2026
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