Quick Answer
The answer is DNS, the Domain Name System, because it is the service specifically designed for hostname-to-IP address translation. When a client needs to reach `server.example.com`, DNS name resolution queries a distributed database to return the corresponding IP address, enabling communication over the network. On the CCNA 200-301 v2 exam, this concept tests your ability to distinguish between core network services: DNS handles name resolution, DHCP provides IP configuration, NTP synchronizes time, and ARP resolves local MAC addresses. A common trap is confusing ARP with DNS, but remember that ARP works only within a local subnet for IPv4, while DNS resolves any hostname globally. To keep them straight, use the memory tip: DNS is the phonebook for the internet, turning names into numbers—just like a contact list on your phone.
This 200-301 practice question tests your understanding of network services and security. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. A key principle to apply: dNS resolves human-readable hostnames into IP addresses, enabling devices to communicate using domain names instead of numeric IPs.. 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.
Which service would a client most directly rely on to convert `server.example.com` into an IP address?
DNS
This is correct because DNS resolves hostnames into IP information.
ARP
Why wrong: This is wrong because ARP resolves local IPv4 addresses to MAC addresses, not hostnames to IPs.
NTP
Why wrong: This is wrong because NTP synchronizes time rather than resolving names.
CDP
Why wrong: This is wrong because CDP is a neighbor discovery protocol, not a hostname-resolution service.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
DNS
The client relies on DNS for name resolution. In plain language, DNS is the service that lets devices and users use readable names instead of memorizing numeric IP addresses. When the client needs to reach `server.example.com`, DNS helps translate that hostname into the IP-related information needed for actual communication. This is different from DHCP, which supplies address configuration, and from NTP, which synchronizes time. It is also different from ARP, which resolves local IPv4 addresses to MAC addresses. The correct answer is the one associated specifically with hostname resolution.
Key principle: DNS resolves human-readable hostnames into IP addresses, enabling devices to communicate using domain names instead of numeric IPs.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
DNS
ARP
Why it's wrong here
This is wrong because ARP resolves local IPv4 addresses to MAC addresses, not hostnames to IPs.
When this WOULD be correct
If the question asked about determining the MAC address of a device given its IP address within a local network, ARP would be the correct answer. For example, 'Which protocol is used to resolve an IP address to a MAC address on a local network?' would make ARP the right choice.
NTP
Why it's wrong here
This is wrong because NTP synchronizes time rather than resolving names.
When this WOULD be correct
If the exam question asked which service is responsible for synchronizing the time on a networked device, then NTP would be the correct answer. For example, a question could state, 'Which protocol ensures accurate timekeeping across devices in a network?'
CDP
Why it's wrong here
This is wrong because CDP is a neighbor discovery protocol, not a hostname-resolution service.
When this WOULD be correct
In a question asking about the identification of neighboring Cisco devices on a network, such as 'Which protocol allows a router to discover information about directly connected devices?', CDP would be the correct answer as it is specifically designed for that purpose.
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
This is correct because DNS resolves hostnames into IP information.
Why this is wrong here
ARP (Address Resolution Protocol) operates at Layer 2 and resolves IPv4 addresses to MAC addresses within a local network segment. It does not perform hostname-to-IP resolution; instead, it maps an already-known IP address to a hardware address for data link layer communication.
★ When this WOULD be the correct answer
If the question asked about determining the MAC address of a device given its IP address within a local network, ARP would be the correct answer. For example, 'Which protocol is used to resolve an IP address to a MAC address on a local network?' would make ARP the right choice.
Why candidates choose this
Students may confuse ARP with DNS because both involve address resolution. However, ARP resolves IP to MAC, not hostname to IP, and is limited to local network communication.
Why this is wrong here
NTP (Network Time Protocol) is used to synchronize clocks between devices over a network. It does not provide any name resolution functionality; its sole purpose is time synchronization, which is critical for logging and authentication but unrelated to converting hostnames to IP addresses.
★ When this WOULD be the correct answer
If the exam question asked which service is responsible for synchronizing the time on a networked device, then NTP would be the correct answer. For example, a question could state, 'Which protocol ensures accurate timekeeping across devices in a network?'
Why candidates choose this
The acronym NTP might be confused with DNS due to both being network services, but their functions are entirely different. Students with partial knowledge might think NTP involves some form of lookup or resolution.
Why this is wrong here
CDP (Cisco Discovery Protocol) is a proprietary Layer 2 protocol used by Cisco devices to discover neighboring devices and learn about their capabilities, such as device type and IP addresses. It does not resolve hostnames to IP addresses for client applications.
★ When this WOULD be the correct answer
In a question asking about the identification of neighboring Cisco devices on a network, such as 'Which protocol allows a router to discover information about directly connected devices?', CDP would be the correct answer as it is specifically designed for that purpose.
Why candidates choose this
CDP's ability to provide IP addresses of neighboring devices might lead students to incorrectly assume it can resolve hostnames. However, CDP is a discovery protocol, not a name resolution service like 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 ARP for DNS because both involve address resolution. However, ARP only resolves IPv4 addresses to MAC addresses within the same local network segment and does not translate hostnames to IP addresses. Candidates might also confuse NTP or CDP as name resolution services, but NTP is for time synchronization, and CDP discovers directly connected Cisco devices. Misunderstanding these roles leads to selecting incorrect answers, especially since the question specifically asks about converting a hostname to an IP address, which only DNS performs.
Detailed technical explanation
The Domain Name System (DNS) is a fundamental IP service that translates human-readable domain names like server.example.com into IP addresses required for network communication. DNS operates in a hierarchical, distributed database structure, allowing clients to query DNS servers to resolve hostnames into IPv4 or IPv6 addresses. This resolution process enables users and applications to use memorable names instead of numeric IP addresses, simplifying network access and management. In the context of Cisco networking and the CCNA exam, DNS resolution is critical for client devices to initiate communication with servers or other network resources. When a client needs to connect to a hostname, it sends a DNS query to a configured DNS server, which responds with the corresponding IP address. This process is distinct from other IP services such as ARP, which resolves IP addresses to MAC addresses on a local subnet, or NTP, which synchronizes time. Understanding the specific role of DNS in name resolution is essential for configuring and troubleshooting network connectivity. A common exam trap is confusing DNS with ARP or other protocols that resolve addresses but operate at different layers or scopes. While ARP resolves IPv4 addresses to MAC addresses on the local network segment, DNS resolves hostnames to IP addresses across networks. Practically, DNS enables scalable and user-friendly network access, whereas ARP supports local data-link layer communication. Recognizing this distinction helps avoid errors in both exam scenarios and real-world Cisco network configurations.
Key takeaway
DNS resolves human-readable hostnames into IP addresses, enabling devices to communicate using domain names instead of numeric IPs.
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 hostnames into IP addresses, enabling devices to communicate using domain names instead of numeric IPs. 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 hostnames into IP addresses, enabling devices to communicate using domain names instead of numeric IPs., 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 hostnames into IP addresses, enabling devices to communicate using domain names instead of numeric IPs..
The correct answer is: DNS — The client relies on DNS for name resolution. In plain language, DNS is the service that lets devices and users use readable names instead of memorizing numeric IP addresses. When the client needs to reach `server.example.com`, DNS helps translate that hostname into the IP-related information needed for actual communication. This is different from DHCP, which supplies address configuration, and from NTP, which synchronizes time. It is also different from ARP, which resolves local IPv4 addresses to MAC addresses. The correct answer is the one associated specifically with hostname resolution.
Review dNS resolves human-readable hostnames into IP addresses, enabling devices to communicate using domain names instead of numeric IPs., then practise related 200-301 questions on the same topic to reinforce the concept.
DNS resolves human-readable hostnames into IP addresses, enabling devices to communicate using domain names instead of numeric IPs.
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Last reviewed: May 17, 2026
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