This 200-301 practice question tests your understanding of network infrastructure and connectivity. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. A key principle to apply: aRP resolves IPv4 addresses to MAC addresses to enable local Layer 2 frame delivery within the same broadcast domain.. 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 statement correctly describes the purpose of ARP in an IPv4 network?
It maps a MAC address to a DNS hostname
Why wrong: Distractor.
It maps an IPv4 address to a MAC address on the local segment
Correct choice.
It advertises routes between routers
Why wrong: Distractor.
It negotiates trunk encapsulation between switches
Why wrong: Distractor.
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 maps an IPv4 address to a MAC address on the local segment
ARP maps a known IPv4 address to a Layer 2 MAC address on the local network segment. That allows the sender to build the Ethernet frame needed for local delivery.
Key principle: ARP resolves IPv4 addresses to MAC addresses to enable local Layer 2 frame delivery within the same broadcast domain.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
It maps a MAC address to a DNS hostname
Why it's wrong here
Distractor.
When this WOULD be correct
If the question were to ask about the function of a DNS service in a network, specifically regarding how it resolves hostnames to IP addresses, then this option would be correct. In that context, a candidate might discuss how MAC addresses relate to DNS in a broader networking scenario.
It maps an IPv4 address to a MAC address on the local segment
Why this is correct
Correct choice.
Related concept
ARP resolves IPv4 addresses to MAC addresses to enable local Layer 2 frame delivery within the same broadcast domain.
It advertises routes between routers
Why it's wrong here
Distractor.
When this WOULD be correct
If the exam question was about the function of routing protocols in a network, a statement about ARP advertising routes could be correct in a context where ARP is mistakenly described as a routing protocol, perhaps in a question testing knowledge of network protocols in general.
It negotiates trunk encapsulation between switches
Why it's wrong here
Distractor.
When this WOULD be correct
If the question were about the role of protocols in switch operations, a question could ask which protocol is responsible for negotiating trunk links between switches. In that context, option D would correctly describe the purpose of DTP in establishing trunk encapsulation.
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 choice.
Why this is wrong here
This option is incorrect because ARP (Address Resolution Protocol) does not map MAC addresses to DNS hostnames; instead, it resolves IP addresses to MAC addresses within a local network segment.
★ When this WOULD be the correct answer
If the question were to ask about the function of a DNS service in a network, specifically regarding how it resolves hostnames to IP addresses, then this option would be correct. In that context, a candidate might discuss how MAC addresses relate to DNS in a broader networking scenario.
Why candidates choose this
Candidates might choose this option due to a misunderstanding of how network address resolution works, confusing ARP's role with that of DNS, which is commonly associated with hostname resolution.
Why this is wrong here
Option C is incorrect because ARP (Address Resolution Protocol) is not responsible for advertising routes; that function is typically handled by routing protocols like OSPF or BGP.
★ When this WOULD be the correct answer
If the exam question was about the function of routing protocols in a network, a statement about ARP advertising routes could be correct in a context where ARP is mistakenly described as a routing protocol, perhaps in a question testing knowledge of network protocols in general.
Why candidates choose this
Candidates may find this option tempting due to confusion between ARP's role in local network communication and the broader context of routing, leading them to associate ARP with routing functions.
Why this is wrong here
Option D is incorrect because ARP (Address Resolution Protocol) is not involved in negotiating trunk encapsulation; that function is typically handled by protocols like DTP (Dynamic Trunking Protocol) in switch configurations.
★ When this WOULD be the correct answer
If the question were about the role of protocols in switch operations, a question could ask which protocol is responsible for negotiating trunk links between switches. In that context, option D would correctly describe the purpose of DTP in establishing trunk encapsulation.
Why candidates choose this
Candidates might find this option tempting because they may confuse ARP's role in network communication with the broader functions of network protocols, leading them to mistakenly associate ARP with switch 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
A common exam trap is confusing ARP’s function with DNS or routing protocols. Some candidates mistakenly believe ARP maps MAC addresses to DNS hostnames or advertises routes between routers. This misunderstanding arises because ARP deals with address resolution, but only at the local Layer 2 segment, not with name resolution or routing. Another trap is thinking ARP negotiates trunk encapsulation between switches, which is unrelated. Recognizing that ARP strictly maps IPv4 addresses to MAC addresses on the local network segment helps avoid these pitfalls and select the correct answer confidently.
Detailed technical explanation
Address Resolution Protocol (ARP) is a fundamental protocol in IPv4 networking that resolves Layer 3 IP addresses to Layer 2 MAC addresses within a local broadcast domain. When a device wants to communicate with another device on the same local network, it must encapsulate the IP packet inside a frame addressed to the destination MAC address. Since the sender only knows the IPv4 address initially, ARP broadcasts a request to discover the MAC address associated with that IP. The ARP process involves sending a broadcast ARP request packet asking "Who has this IPv4 address?" The device owning that IP responds with its MAC address in an ARP reply. Cisco devices cache these mappings in an ARP table to optimize future communications. This mechanism is crucial for Ethernet networks where MAC addresses are required for frame delivery, and it operates only within the local subnet, not across routers. A common exam trap is confusing ARP with protocols that operate at different layers or serve different purposes, such as DNS for hostname resolution or routing protocols like OSPF for route advertisement. Practically, ARP is essential for local delivery but does not function beyond the local segment. Understanding this distinction helps avoid misinterpreting ARP’s role in IP networking and ensures correct answers on the CCNA exam.
Key takeaway
ARP resolves IPv4 addresses to MAC addresses to enable local Layer 2 frame delivery within the same broadcast domain.
Real-world example
A help-desk technician troubleshoots why a newly connected PC cannot reach shared printers on the same floor. The cable is good, the switch port is active, but the PC is in VLAN 20 and the printers are in VLAN 10. The uplink trunk only allows VLAN 10. A trunk being up does not mean every VLAN crosses it.
What to study next
Review aRP resolves IPv4 addresses to MAC addresses to enable local Layer 2 frame delivery within the same broadcast domain., then practise related 200-301 questions on the same topic to reinforce the concept.
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FAQ
Network Infrastructure and Connectivity — This question tests Network Infrastructure and Connectivity — ARP resolves IPv4 addresses to MAC addresses to enable local Layer 2 frame delivery within the same broadcast domain..
The correct answer is: It maps an IPv4 address to a MAC address on the local segment — ARP maps a known IPv4 address to a Layer 2 MAC address on the local network segment. That allows the sender to build the Ethernet frame needed for local delivery.
Review aRP resolves IPv4 addresses to MAC addresses to enable local Layer 2 frame delivery within the same broadcast domain., then practise related 200-301 questions on the same topic to reinforce the concept.
ARP resolves IPv4 addresses to MAC addresses to enable local Layer 2 frame delivery within the same broadcast domain.
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Last reviewed: May 17, 2026
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