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 domain names into IP addresses to enable 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 network service to its primary purpose.
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) translates human-readable domain names (like www.example.com) into IP addresses, enabling devices to locate resources on a network.
B
DNS - Assigns IP addresses to devices dynamically
Why wrong: This is incorrect because assigning IP addresses dynamically is the function of DHCP, not DNS.
C
DNS - Provides secure remote access to network devices
Why wrong: This is incorrect because secure remote access is provided by protocols like SSH, not DNS.
D
DNS - Manages network devices via SNMP
Why wrong: This is incorrect because network management via SNMP is a separate function; DNS only handles name resolution.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
DNS - Resolves domain names to IP addresses
DNS resolves human-readable hostnames to IP addresses, enabling users to access websites by name. DHCP automatically assigns IP addresses, subnet masks, default gateways, and other parameters to clients, simplifying network configuration. NTP synchronizes clocks across network devices to ensure consistent timestamps for logs and transactions. Syslog sends event messages from network devices to a central logging server for monitoring and troubleshooting.
Key principle: DNS resolves human-readable domain names into IP addresses to enable 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 - Resolves domain names to IP addresses
Why this is correct
DNS (Domain Name System) translates human-readable domain names (like www.example.com) into IP addresses, enabling devices to locate resources on a network.
Clue confirmation
The clue word "primary" in the question point toward this answer.
Related concept
DNS resolves human-readable domain names into IP addresses to enable devices to locate each other on a network.
✗
DNS - Assigns IP addresses to devices dynamically
Why it's wrong here
This is incorrect because assigning IP addresses dynamically is the function of DHCP, not DNS.
✗
DNS - Provides secure remote access to network devices
Why it's wrong here
This is incorrect because secure remote access is provided by protocols like SSH, not DNS.
✗
DNS - Manages network devices via SNMP
Why it's wrong here
This is incorrect because network management via SNMP is a separate function; DNS only handles name resolution.
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 - Resolves domain names to IP addressesCorrect answer▾
Why this is correct
DNS (Domain Name System) translates human-readable domain names (like www.example.com) into IP addresses, enabling devices to locate resources on a network.
✗DNS - Assigns IP addresses to devices dynamicallyWrong answer — click to see why▾
Why this is wrong here
DNS is responsible for name resolution, not IP address assignment.
Why candidates choose this
Candidates may confuse DNS with DHCP because both are essential network services that deal with IP addresses.
✗DNS - Provides secure remote access to network devicesWrong answer — click to see why▾
Why this is wrong here
DNS does not provide any form of remote access; it only resolves names to IP addresses.
Why candidates choose this
Candidates might think DNS is involved in remote access because it resolves the hostname used to connect.
✗DNS - Manages network devices via SNMPWrong answer — click to see why▾
Why this is wrong here
SNMP is used for monitoring and managing network devices, while DNS is for name resolution.
Why candidates choose this
Candidates may associate DNS with network management because both are critical for network operations.
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
Learners often confuse the purpose of Syslog with SNMP, but Syslog is specifically for sending event messages to a logging server, not for gathering statistics or management.
Detailed technical explanation
How to think about this question
DNS is a fundamental IP service that maps domain names to IP addresses, allowing users and applications to use easy-to-remember names instead of numeric IPs. In Cisco networks, DNS is essential for resolving names in routing protocols, management, and application access. Without DNS, devices would require manual IP address entry, which is error-prone and inefficient.
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 dynamic network configuration and reducing administrative overhead. DHCP leases addresses for a limited time, allowing efficient reuse of IP addresses in large networks.
NTP maintains synchronized time across all network devices, which is critical for accurate log timestamps, security protocols, and troubleshooting. Cisco devices use NTP to ensure consistency in time-dependent operations. Syslog complements this by exporting log messages with timestamps, enabling centralized monitoring and historical analysis of network events. Misconfigured time can lead to confusing logs and security issues, making NTP and Syslog integration vital in Cisco environments.
KKey Concepts to Remember
DNS resolves human-readable domain names into IP addresses to enable devices to locate each other on a network.
DHCP dynamically assigns IP addresses and network configuration parameters to hosts to simplify network management.
NTP synchronizes the clocks of all network devices to ensure consistent timestamps for logs and security protocols.
Syslog exports log messages from network devices to centralized servers for monitoring and troubleshooting network events.
Cisco devices can act as DHCP servers or relay agents to facilitate dynamic IP address assignment within networks.
Accurate time synchronization via NTP is critical for correlating events and maintaining security in Cisco network environments.
DNS is essential for routing protocols and management tasks that rely on hostname resolution in Cisco networks.
Misunderstanding the distinct roles of DNS, DHCP, NTP, and Syslog leads to common exam mistakes and network misconfigurations.
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 to enable 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 domain names into IP addresses to enable 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 domain names into IP addresses to enable devices to locate each other on a network..
What is the correct answer to this question?
The correct answer is: DNS - Resolves domain names to IP addresses — DNS resolves human-readable hostnames to IP addresses, enabling users to access websites by name. DHCP automatically assigns IP addresses, subnet masks, default gateways, and other parameters to clients, simplifying network configuration. NTP synchronizes clocks across network devices to ensure consistent timestamps for logs and transactions. Syslog sends event messages from network devices to a central logging server for monitoring and troubleshooting.
What should I do if I get this 200-301 question wrong?
Review dNS resolves human-readable domain names into IP addresses to enable 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 domain names into IP addresses to enable devices to locate each other on a network.
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