Question 1,232 of 1,389
CCNA Network Services and Security Practice Question
Which two statements accurately describe DNS in normal network operation?
⚠ Common exam trap
A frequent exam trap is mistaking DNS for DHCP or routing protocols. Some candidates incorrectly believe DNS dynamically assigns IP addresses like DHCP or that it replaces the need for default gateways. This confusion arises because both DNS and DHCP are IP services but serve fundamentally different roles. DNS strictly resolves hostnames to IP addresses and does not handle IP address allocation or routing decisions. Misinterpreting DNS’s function can lead to selecting incorrect answers that describe DHCP’s role or routing concepts, which do not apply to DNS.
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 helps resolve hostnames into IP-related information.
DNS helps translate human-friendly names into IP-related information. In plain language, it allows users and applications to work with names instead of memorizing numeric addresses. It also means that a network can change the underlying IP address of a service while keeping the public-facing name the same. DNS is therefore both a usability service and an important abstraction layer. The wrong answers often confuse DNS with DHCP or routing protocols. The two correct answers are the ones that preserve its role in name resolution and human-friendly network use.
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 helps resolve hostnames into IP-related information.
Why this is correct
This is correct because name resolution is the main purpose of DNS.
- ✓
DNS makes networks easier for humans to use by allowing names instead of raw IP addresses.
Why this is correct
This is correct because DNS improves usability through naming.
- ✗
DNS dynamically assigns host IP addresses like DHCP.
Why it's wrong here
This is wrong because DHCP, not DNS, assigns host IP configuration.
When this WOULD be correct
If the exam question were to ask about network services that provide IP address assignments to devices on a network, then this option would be correct. For example, a question could state, 'Which protocol is responsible for dynamically assigning IP addresses to clients in a network?'
- ✗
DNS replaces the need for default gateways.
Why it's wrong here
This is wrong because DNS does not remove routing requirements.
When this WOULD be correct
If the exam question were to ask about the roles of various network protocols in a routing context, a statement might be framed to imply that DNS can serve as a default gateway in a specific network architecture, perhaps in a hypothetical scenario where DNS is integrated with routing functionalities.
- ✗
DNS is the spanning-tree protocol used on VLAN trunks.
Why it's wrong here
This is wrong because DNS is unrelated to STP.
When this WOULD be correct
If the exam question asked about network protocols and their functions in managing VLANs, specifically in the context of preventing broadcast storms or ensuring loop-free topologies, then option E could be correct. For example, a question could ask which protocol is responsible for maintaining a loop-free network in a VLAN environment.
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 helps resolve hostnames into IP-related information.Correct answer▾
Why this is correct
This is correct because name resolution is the main purpose of DNS.
✗DNS dynamically assigns host IP addresses like DHCP.Wrong answer — click to see why▾
Why this is wrong here
This option is incorrect because DNS (Domain Name System) is responsible for resolving domain names to IP addresses, not for dynamically assigning IP addresses to hosts, which is the function of DHCP (Dynamic Host Configuration Protocol).
★ When this WOULD be the correct answer
If the exam question were to ask about network services that provide IP address assignments to devices on a network, then this option would be correct. For example, a question could state, 'Which protocol is responsible for dynamically assigning IP addresses to clients in a network?'
Why candidates choose this
Candidates may confuse DNS with DHCP due to their complementary roles in network management, leading them to mistakenly believe that DNS also handles IP address assignments.
✗DNS replaces the need for default gateways.Wrong answer — click to see why▾
Why this is wrong here
DNS does not replace the need for default gateways; instead, it functions as a naming system that translates domain names into IP addresses. Default gateways are essential for routing traffic outside a local network, which is unrelated to DNS functionality.
★ When this WOULD be the correct answer
If the exam question were to ask about the roles of various network protocols in a routing context, a statement might be framed to imply that DNS can serve as a default gateway in a specific network architecture, perhaps in a hypothetical scenario where DNS is integrated with routing functionalities.
Why candidates choose this
Candidates may confuse DNS with other network services that manage traffic flow, leading them to mistakenly believe that DNS could serve as a default gateway due to its role in facilitating network communication.
✗DNS is the spanning-tree protocol used on VLAN trunks.Wrong answer — click to see why▾
Why this is wrong here
Option E is incorrect because DNS (Domain Name System) is not related to the spanning-tree protocol, which is used to prevent loops in network topologies, particularly in VLANs. DNS is focused on resolving domain names to IP addresses, not on managing VLAN traffic.
★ When this WOULD be the correct answer
If the exam question asked about network protocols and their functions in managing VLANs, specifically in the context of preventing broadcast storms or ensuring loop-free topologies, then option E could be correct. For example, a question could ask which protocol is responsible for maintaining a loop-free network in a VLAN environment.
Why candidates choose this
Candidates may find option E tempting because it includes technical terminology related to networking, and they might confuse the roles of different protocols, mistakenly associating DNS with VLAN management due to their familiarity with both concepts.
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?”
Visual reference
Quick reference
Routing Protocol Comparison
| Protocol | Metric | Max Hops | Algorithm | Type |
|---|---|---|---|---|
| RIP v2 | Hop count | 15 | Bellman-Ford | Distance vector |
| OSPF | Cost (bandwidth) | Unlimited | Dijkstra (SPF) | Link state |
| EIGRP | Composite metric | Unlimited | DUAL | Hybrid |
| IS-IS | Cost | Unlimited | Dijkstra | Link state |
| BGP | Policy / attributes | Unlimited | Path vector | Path vector |
RIP's 15-hop limit makes it unsuitable for large networks. OSPF and EIGRP dominate modern enterprise deployments.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Last reviewed: May 17, 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.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.