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 each other on an IP 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.
What is the main function of DNS in an IP network?
It assigns IP addresses to clients automatically.
Why wrong: That is the role of DHCP.
It resolves hostnames to IP addresses.
Correct. That is the primary DNS function being tested here.
It encrypts application traffic end to end.
Why wrong: DNS does not provide that role by default.
It advertises default routes to routers.
Why wrong: DNS is not a routing protocol.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
It resolves hostnames to IP addresses.
DNS resolves human-readable names to IP addresses and can also store related records.
Key principle: DNS resolves human-readable domain names into IP addresses, enabling devices to locate each other on an IP network.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
It assigns IP addresses to clients automatically.
Why it's wrong here
That is the role of DHCP.
When this WOULD be correct
In a question asking about the functions of network services in a local area network, where the focus is on client configuration, the option could be correct if it specifies that DNS can assist in the process of name resolution which indirectly supports IP assignment by DHCP.
It resolves hostnames to IP addresses.
It encrypts application traffic end to end.
Why it's wrong here
DNS does not provide that role by default.
When this WOULD be correct
If the exam question asked about the functions of a security protocol like TLS or SSL, which are designed to encrypt data in transit, then this option would be correct as it pertains to those protocols' capabilities.
It advertises default routes to routers.
Why it's wrong here
DNS is not a routing protocol.
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
Correct. That is the primary DNS function being tested here.
Why this is wrong here
This option is incorrect because DNS (Domain Name System) does not assign IP addresses; it translates domain names into IP addresses. The function of assigning IP addresses automatically is typically handled by DHCP (Dynamic Host Configuration Protocol).
★ When this WOULD be the correct answer
In a question asking about the functions of network services in a local area network, where the focus is on client configuration, the option could be correct if it specifies that DNS can assist in the process of name resolution which indirectly supports IP assignment by DHCP.
Why candidates choose this
Candidates may choose this option due to confusion between DNS and DHCP, as both are essential for network configuration and often work together in assigning and resolving addresses in an IP network.
Why this is wrong here
This option is wrong because DNS (Domain Name System) does not handle encryption of application traffic; its primary function is to resolve domain names to IP addresses.
★ When this WOULD be the correct answer
If the exam question asked about the functions of a security protocol like TLS or SSL, which are designed to encrypt data in transit, then this option would be correct as it pertains to those protocols' capabilities.
Why candidates choose this
Candidates may be tempted to choose this option due to a general understanding that security is a critical aspect of networking, leading them to associate DNS with encryption without recognizing its specific role.
Why this is wrong here
Option D is incorrect because DNS does not handle routing information; it is primarily responsible for translating domain names into IP addresses, not for advertising routes to routers.
★ When this WOULD be the correct answer
If the question asked about the functions of routing protocols or how routers communicate with each other in a network, then option D could be correct, as routing protocols like RIP or OSPF do advertise default routes to routers.
Why candidates choose this
Candidates may choose this option due to a misunderstanding of network functions, conflating DNS with routing protocols, or because they recognize that routing is a critical aspect of network operations and mistakenly associate it with DNS.
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 mistaking DNS for DHCP or routing protocols. Some candidates incorrectly believe DNS assigns IP addresses to clients, which is actually the DHCP server's role. Others confuse DNS with routing functions, such as advertising default routes, which is handled by routing protocols like OSPF or EIGRP. This confusion arises because all these services are vital in IP networks but serve distinct purposes. Understanding that DNS solely resolves hostnames to IP addresses helps avoid this trap and select the correct answer confidently.
Detailed technical explanation
The Domain Name System (DNS) is a fundamental IP service that translates human-friendly domain names into IP addresses, enabling devices to locate and communicate with each other on a network. DNS operates as a distributed database with hierarchical zones, allowing scalable and efficient hostname resolution across the internet and private networks. In Cisco networking, DNS is essential for resolving names in various protocols and services, facilitating easier management and connectivity. When a device needs to communicate with another device using a hostname, it queries a DNS server to obtain the corresponding IP address. This process involves recursive or iterative queries that traverse DNS servers until the authoritative server for the domain is found. Cisco devices can be configured to use DNS for hostname resolution, improving usability and integration with network management tools. DNS does not assign IP addresses; that role belongs to DHCP, which dynamically allocates IP addresses to clients. A common exam trap is confusing DNS with DHCP or routing protocols. DNS strictly resolves names to IP addresses and does not handle IP address assignment or route advertisement. Misunderstanding this can lead to incorrect answers, especially when options mention IP assignment or routing functions. Practically, DNS improves network usability by allowing administrators and users to use memorable names instead of numeric IP addresses, which is critical in large or dynamic networks.
Key takeaway
DNS resolves human-readable domain names into IP addresses, enabling devices to locate each other on an IP 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. DNS resolves human-readable domain names into IP addresses, enabling devices to locate each other on an IP network. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Review dNS resolves human-readable domain names into IP addresses, enabling devices to locate each other on an IP 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 — DNS resolves human-readable domain names into IP addresses, enabling devices to locate each other on an IP network..
The correct answer is: It resolves hostnames to IP addresses. — DNS resolves human-readable names to IP addresses and can also store related records.
Review dNS resolves human-readable domain names into IP addresses, enabling devices to locate each other on an IP network., then practise related 200-301 questions on the same topic to reinforce the concept.
DNS resolves human-readable domain names into IP addresses, enabling devices to locate each other on an IP network.
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Last reviewed: May 17, 2026
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