- A
DNS: Resolves hostnames to IP addresses
DNS (Domain Name System) translates human-readable domain names (like www.example.com) into IP addresses, directly solving the problem of name resolution.
- B
DHCP: Automatically assigns IP addresses to devices
DHCP (Dynamic Host Configuration Protocol) automates IP address assignment, not time synchronization. Time synchronization is handled by NTP (Network Time Protocol).
- C
NTP: Synchronizes clocks across network devices
SNMP (Simple Network Management Protocol) is used for monitoring and managing network devices, not for traffic analysis. Traffic analysis is typically done with NetFlow or sFlow.
- D
SNMP: Monitors and manages network devices
Syslog is indeed used for log centralization, but the correct match for 'log centralization' is Syslog. However, the question asks for the problem each service most directly helps solve, and Syslog is correctly matched with log centralization. But since the correct answer is DNS, this option is incorrect in the context of the matching set provided.
CCNA Network Services and Security Practice Question
This 200-301 practice question tests your understanding of network services and security. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. A key principle to apply: dNS resolves human-readable domain names into IP addresses, enabling devices to locate services on a network or the internet.. 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.
Match each service or protocol to the problem it most directly helps solve.
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
DNS: Resolves hostnames to IP addresses
Each service or protocol directly addresses a specific networking problem as described.
Key principle: DNS resolves human-readable domain names into IP addresses, enabling devices to locate services on a network or the internet.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
DNS: Resolves hostnames to IP addresses
Why this is correct
DNS (Domain Name System) translates human-readable domain names (like www.example.com) into IP addresses, directly solving the problem of name resolution.
Related concept
DNS resolves human-readable domain names into IP addresses, enabling devices to locate services on a network or the internet.
- ✓
DHCP: Automatically assigns IP addresses to devices
Why this is correct
DHCP (Dynamic Host Configuration Protocol) automates IP address assignment, not time synchronization. Time synchronization is handled by NTP (Network Time Protocol).
Related concept
DNS resolves human-readable domain names into IP addresses, enabling devices to locate services on a network or the internet.
- ✓
NTP: Synchronizes clocks across network devices
Why this is correct
SNMP (Simple Network Management Protocol) is used for monitoring and managing network devices, not for traffic analysis. Traffic analysis is typically done with NetFlow or sFlow.
Related concept
DNS resolves human-readable domain names into IP addresses, enabling devices to locate services on a network or the internet.
- ✓
SNMP: Monitors and manages network devices
Why this is correct
Syslog is indeed used for log centralization, but the correct match for 'log centralization' is Syslog. However, the question asks for the problem each service most directly helps solve, and Syslog is correctly matched with log centralization. But since the correct answer is DNS, this option is incorrect in the context of the matching set provided.
Related concept
DNS resolves human-readable domain names into IP addresses, enabling devices to locate services on a network or the internet.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Be careful not to confuse the primary function of each protocol. For example, DHCP can provide additional options like NTP server, but its core purpose is IP address assignment. Similarly, SNMP monitors devices but does not perform traffic analysis. Focus on the most direct problem each service solves.
Detailed technical explanation
How to think about this question
DNS (Domain Name System) is a fundamental IP service that translates user-friendly domain names into IP addresses required for routing traffic. Without DNS, users must remember numeric IP addresses, which is impractical. In Cisco networks, DNS is configured on routers and switches to enable name resolution for network devices and services. When DNS fails, users experience errors like "host not found" or inability to access websites by name, indicating the need to verify DNS server availability and configuration. DHCP (Dynamic Host Configuration Protocol) automates the assignment of IP addresses and other network parameters such as subnet mask, default gateway, and DNS servers to hosts. This automation prevents IP conflicts and reduces manual configuration errors. Cisco devices can act as DHCP servers or relay agents. When DHCP fails, hosts may not obtain an IP address, resulting in limited or no connectivity. Troubleshooting involves checking DHCP scopes, server status, and relay configurations. NTP (Network Time Protocol) ensures all network devices synchronize their clocks to a reliable time source, which is crucial for accurate logging, security protocols, and time-sensitive applications. Cisco devices use NTP to maintain consistent timestamps across logs and events. If NTP is misconfigured or unreachable, devices show time drift, making it difficult to correlate events during troubleshooting. Syslog collects and forwards log messages from network devices to a centralized server, enabling administrators to monitor network health and diagnose issues. Without syslog, event tracking is decentralized and inefficient. Cisco devices support syslog with configurable severity levels and message forwarding, making it a vital tool for operational visibility.
KKey Concepts to Remember
- DNS resolves human-readable domain names into IP addresses, enabling devices to locate services on a network or the internet.
- DHCP dynamically assigns IP configuration parameters to hosts, preventing manual IP address configuration errors and simplifying network management.
- NTP synchronizes the clocks of network devices to a common time source, ensuring consistent timestamps for logs and time-sensitive operations.
- Syslog centralizes event and error messages from multiple devices, allowing administrators to monitor and troubleshoot network issues efficiently.
- Matching network symptoms to the correct service or protocol helps isolate the root cause quickly and reduces troubleshooting time.
- DNS failures typically manifest as inability to reach services by name, while DHCP failures result in hosts lacking valid IP addresses.
- NTP discrepancies cause inconsistent timestamps across devices, complicating log correlation and event sequencing during troubleshooting.
- Syslog provides a centralized repository for device-generated messages, which is critical for proactive network monitoring and historical analysis.
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
DNS resolves human-readable domain names into IP addresses, enabling devices to locate services on a network or the internet.
Real-world example
How this comes up in practice
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. DNS resolves human-readable domain names into IP addresses, enabling devices to locate services on a network or the internet. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Got this wrong? Here's your next step.
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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 — DNS resolves human-readable domain names into IP addresses, enabling devices to locate services on a network or the internet..
What is the correct answer to this question?
The correct answer is: DNS: Resolves hostnames to IP addresses — Each service or protocol directly addresses a specific networking problem as described.
What should I do if I get this 200-301 question wrong?
Review dNS resolves human-readable domain names into IP addresses, enabling devices to locate services on a network or the internet., then practise related 200-301 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
DNS resolves human-readable domain names into IP addresses, enabling devices to locate services on a network or the internet.
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Last reviewed: May 17, 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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