- A
DNS: Resolves domain names to IP addresses
DNS (Domain Name System) resolves human-readable domain names (e.g., www.example.com) into IP addresses, enabling devices to locate resources on a network.
- B
DHCP: Automatically assigns IP addresses to devices
This is incorrect because DHCP (Dynamic Host Configuration Protocol) is responsible for dynamically assigning IP addresses and other network parameters, not for name resolution.
- C
NAT: Translates private IPs to public IPs for internet access
This is incorrect because HTTP (Hypertext Transfer Protocol) is used for transferring web pages and other content from servers to clients, not for name resolution.
- D
ICMP: Sends error messages and operational information
This is incorrect because SMTP (Simple Mail Transfer Protocol) is used for sending email messages between servers, not for translating names to IP addresses.
Quick Answer
The answer is NAT, which translates private IPs to public IPs for internet access. This is correct because NAT allows multiple devices on a local network using private RFC 1918 addresses to share a single public IP, enabling outbound connectivity while conserving global address space. On the CCNA 200-301 v2 exam, this purpose is tested alongside other IP protocols purposes like DNS, DHCP, and ICMP, often in matching or scenario-based questions where you must distinguish between address translation, name resolution, automatic configuration, and error reporting. A common trap is confusing NAT with DHCP, since both involve IP addresses, but remember that DHCP assigns addresses locally while NAT modifies packet headers at the gateway. For a quick memory tip, think “NAT = Network Address Translation, turning private into public,” and pair it with the mnemonic “DNS Does Names, DHCP Hands Configs, NAT Navigates Addresses.”
CCNA Network Infrastructure and Connectivity Practice Question
This 200-301 practice question tests your understanding of network infrastructure and connectivity. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. A key principle to apply: dHCP dynamically assigns IP addresses and network configuration parameters to clients, reducing manual setup and preventing IP conflicts.. 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 IP service or protocol to its most accurate purpose.
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 domain names to IP addresses
DHCP automatically assigns IP addresses and other network parameters to clients. DNS translates domain names into IP addresses. ARP resolves a local IPv4 address to a MAC address on the same subnet. NTP synchronizes device clocks over a network. These four protocols are correctly matched to their primary purposes.
Key principle: DHCP dynamically assigns IP addresses and network configuration parameters to clients, reducing manual setup and preventing IP conflicts.
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) resolves human-readable domain names (e.g., www.example.com) into IP addresses, enabling devices to locate resources on a network.
Related concept
DHCP dynamically assigns IP addresses and network configuration parameters to clients, reducing manual setup and preventing IP conflicts.
- ✓
DHCP: Automatically assigns IP addresses to devices
Why this is correct
This is incorrect because DHCP (Dynamic Host Configuration Protocol) is responsible for dynamically assigning IP addresses and other network parameters, not for name resolution.
Related concept
DHCP dynamically assigns IP addresses and network configuration parameters to clients, reducing manual setup and preventing IP conflicts.
- ✓
NAT: Translates private IPs to public IPs for internet access
Why this is correct
This is incorrect because HTTP (Hypertext Transfer Protocol) is used for transferring web pages and other content from servers to clients, not for name resolution.
Related concept
DHCP dynamically assigns IP addresses and network configuration parameters to clients, reducing manual setup and preventing IP conflicts.
- ✓
ICMP: Sends error messages and operational information
Why this is correct
This is incorrect because SMTP (Simple Mail Transfer Protocol) is used for sending email messages between servers, not for translating names to IP addresses.
Related concept
DHCP dynamically assigns IP addresses and network configuration parameters to clients, reducing manual setup and preventing IP conflicts.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Be careful not to confuse protocols that work together. For example, DNS is often used by HTTP and SMTP, but each protocol has a distinct primary function. Focus on the core purpose of each protocol as defined in the OSI model.
Detailed technical explanation
How to think about this question
Dynamic Host Configuration Protocol (DHCP) automates the assignment of IP addresses and other network configuration parameters such as subnet mask, default gateway, and DNS servers to client devices. This service reduces manual configuration errors and simplifies network management, especially in large networks. DHCP operates at the application layer and uses UDP ports 67 and 68 for communication between clients and servers. In Cisco environments, DHCP can be configured on routers or dedicated servers to provide centralized IP address management. Domain Name System (DNS) translates human-readable domain names into IP addresses, enabling users and devices to locate resources on the network or internet. DNS operates at the application layer and uses UDP port 53 for queries. Cisco devices rely on DNS to resolve hostnames for management and routing purposes. Understanding DNS is essential for troubleshooting name resolution issues and ensuring network connectivity. Address Resolution Protocol (ARP) resolves IPv4 addresses to MAC addresses within the same broadcast domain, enabling devices to communicate on the local Layer 2 network. ARP operates at the interface between Layer 2 and Layer 3, sending broadcast requests and receiving unicast replies. Network engineers must understand ARP to diagnose local connectivity problems. Network Time Protocol (NTP) synchronizes clocks across network devices, ensuring accurate timestamps for logs and security protocols. NTP operates over UDP port 123 and is critical for time-sensitive applications and coordinated network operations.
KKey Concepts to Remember
- DHCP dynamically assigns IP addresses and network configuration parameters to clients, reducing manual setup and preventing IP conflicts.
- DNS resolves domain names to IP addresses, enabling devices to locate resources using human-readable names instead of numeric addresses.
- ARP maps IPv4 addresses to MAC addresses within the local broadcast domain, facilitating Layer 2 communication between devices.
- NTP synchronizes device clocks across the network to ensure consistent timekeeping for logs, security, and protocol coordination.
- DHCP operates at the application layer using UDP ports 67 and 68 to communicate between clients and servers.
- DNS queries use UDP port 53 and are essential for hostname resolution in Cisco device management and routing.
- ARP sends broadcast requests on the local network to discover MAC addresses corresponding to IPv4 addresses.
- NTP uses UDP port 123 and is critical for maintaining accurate time across Cisco network devices and services.
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
DHCP dynamically assigns IP addresses and network configuration parameters to clients, reducing manual setup and preventing IP conflicts.
Real-world example
How this comes up in practice
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
What to study next
Got this wrong? Here's your next step.
Review dHCP dynamically assigns IP addresses and network configuration parameters to clients, reducing manual setup and preventing IP conflicts., then practise related 200-301 questions on the same topic to reinforce the concept.
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Network Infrastructure and Connectivity — study guide chapter
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Network Infrastructure and Connectivity practice questions
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FAQ
Questions learners often ask
What does this 200-301 question test?
Network Infrastructure and Connectivity — This question tests Network Infrastructure and Connectivity — DHCP dynamically assigns IP addresses and network configuration parameters to clients, reducing manual setup and preventing IP conflicts..
What is the correct answer to this question?
The correct answer is: DNS: Resolves domain names to IP addresses — DHCP automatically assigns IP addresses and other network parameters to clients. DNS translates domain names into IP addresses. ARP resolves a local IPv4 address to a MAC address on the same subnet. NTP synchronizes device clocks over a network. These four protocols are correctly matched to their primary purposes.
What should I do if I get this 200-301 question wrong?
Review dHCP dynamically assigns IP addresses and network configuration parameters to clients, reducing manual setup and preventing IP conflicts., then practise related 200-301 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
DHCP dynamically assigns IP addresses and network configuration parameters to clients, reducing manual setup and preventing IP conflicts.
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Last reviewed: Apr 12, 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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