CCNA Network Services and Security Practice Question
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: dNS resolves human-readable hostnames into IP addresses, enabling devices to locate each other on a 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.
Match each service to its primary function.
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "primary"
Why it matters: Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
DNS (Domain Name System) resolves human-readable domain names into machine-readable IP addresses, enabling users to access websites by name.
B
DNS: Automates the assignment of IP addresses to devices
Why wrong: This is incorrect because DHCP (Dynamic Host Configuration Protocol) automates IP address assignment, not DNS.
C
DNS: Serves web pages to clients
Why wrong: This is incorrect because HTTP (Hypertext Transfer Protocol) serves web pages, not DNS.
D
DNS: Manages network devices via a management information base
Why wrong: This is incorrect because SNMP (Simple Network Management Protocol) manages network devices using a Management Information Base (MIB), not DNS.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
DNS: Translates domain names to IP addresses
DNS translates domain names into IP addresses, enabling clients to reach servers by name. DHCP automates the assignment of IP addresses, subnet masks, default gateways, and other parameters to clients. NTP synchronizes the clocks of network devices to a common time source. Syslog collects and exports log messages from network devices to a centralized server for monitoring and troubleshooting.
Key principle: DNS resolves human-readable hostnames into IP addresses, enabling devices to locate each other on a network.
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: Translates domain names to IP addresses
Why this is correct
DNS (Domain Name System) resolves human-readable domain names into machine-readable IP addresses, enabling users to access websites by name.
Clue confirmation
The clue word "primary" in the question point toward this answer.
Related concept
DNS resolves human-readable hostnames into IP addresses, enabling devices to locate each other on a network.
✗
DNS: Automates the assignment of IP addresses to devices
Why it's wrong here
This is incorrect because DHCP (Dynamic Host Configuration Protocol) automates IP address assignment, not DNS.
✗
DNS: Serves web pages to clients
Why it's wrong here
This is incorrect because HTTP (Hypertext Transfer Protocol) serves web pages, not DNS.
✗
DNS: Manages network devices via a management information base
Why it's wrong here
This is incorrect because SNMP (Simple Network Management Protocol) manages network devices using a Management Information Base (MIB), not DNS.
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.
✓DNS: Translates domain names to IP addressesCorrect answer▾
Why this is correct
DNS (Domain Name System) resolves human-readable domain names into machine-readable IP addresses, enabling users to access websites by name.
✗DNS: Automates the assignment of IP addresses to devicesWrong answer — click to see why▾
Why this is wrong here
The specific factual error: Confusing DNS with DHCP; DNS resolves names, while DHCP assigns IPs.
Why candidates choose this
Candidates pick this because both protocols are essential for network connectivity and are often mentioned together.
✗DNS: Serves web pages to clientsWrong answer — click to see why▾
Why this is wrong here
The specific factual error: Attributing web serving to DNS instead of HTTP.
Why candidates choose this
Candidates pick this because DNS is necessary for web browsing, leading to confusion with HTTP's role.
✗DNS: Manages network devices via a management information baseWrong answer — click to see why▾
Why this is wrong here
The specific factual error: Assigning SNMP's function to DNS.
Why candidates choose this
Candidates pick this because both are network services, and the term 'management' can be misleading.
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: answer the scenario, not the keyword
The exam often tests your ability to differentiate between network services that are commonly confused, such as DNS and DHCP. Remember: DNS resolves names, DHCP assigns IPs. Do not mix up their primary functions.
Detailed technical explanation
How to think about this question
DNS is a hierarchical distributed naming system that resolves domain names into IP addresses, allowing users to access resources using easy-to-remember names instead of numeric IPs. In Cisco networks, DNS is essential for services like routing and management, as many commands and protocols rely on hostname resolution.
DHCP automates the assignment of IP addresses, subnet masks, default gateways, and DNS server information to hosts. Cisco routers and switches can act as DHCP servers or relay agents, facilitating efficient IP address management and reducing manual configuration errors.
NTP maintains accurate time synchronization across network devices, which is vital for timestamping logs, coordinating security protocols, and ensuring proper operation of time-sensitive applications. Syslog collects these timestamped event messages, providing a centralized mechanism for monitoring device status, troubleshooting issues, and auditing network activity in Cisco environments.
KKey Concepts to Remember
DNS resolves human-readable hostnames into IP addresses, enabling devices to locate each other on a network.
DHCP dynamically leases IP addressing details such as IP address, subnet mask, and default gateway to hosts.
NTP synchronizes the clocks of network devices to ensure consistent time across the infrastructure.
Syslog collects and stores event messages from network devices, aiding in troubleshooting and monitoring.
Cisco devices can act as DHCP servers or relay agents to facilitate IP address management.
Accurate time synchronization via NTP is critical for timestamping logs and coordinating security protocols.
DNS resolution is fundamental for routing and management commands that rely on hostname identification.
Syslog messages include timestamps provided by NTP-synchronized clocks, enhancing log reliability.
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 hostnames into IP addresses, enabling devices to locate each other on a network.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this 200-301 question in full detail.
Review dNS resolves human-readable hostnames into IP addresses, enabling devices to locate each other on a network., then practise related 200-301 questions on the same topic to reinforce the concept.
Network Services and Security — This question tests Network Services and Security — DNS resolves human-readable hostnames into IP addresses, enabling devices to locate each other on a network..
What is the correct answer to this question?
The correct answer is: DNS: Translates domain names to IP addresses — DNS translates domain names into IP addresses, enabling clients to reach servers by name. DHCP automates the assignment of IP addresses, subnet masks, default gateways, and other parameters to clients. NTP synchronizes the clocks of network devices to a common time source. Syslog collects and exports log messages from network devices to a centralized server for monitoring and troubleshooting.
What should I do if I get this 200-301 question wrong?
Review dNS resolves human-readable hostnames into IP addresses, enabling devices to locate each other on a network., then practise related 200-301 questions on the same topic to reinforce the concept.
Are there clue words in this question I should notice?
Yes — watch for: "primary". Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
What is the key concept behind this question?
DNS resolves human-readable hostnames into IP addresses, enabling devices to locate each other on a network.
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