CCNA Network Services and Security Practice Question
This 200-301 practice question tests your understanding of network services and security. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. A key principle to apply: dHCP assigns IP addresses and other network parameters, including DNS server addresses, to hosts for proper network communication.. 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 best describes why a host might receive a correct IP address from DHCP but still fail to reach websites by name?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Because DNS service may still be missing, wrong, or unreachable even if DHCP addressing succeeds.
The host may still fail by name because DHCP-provided addressing is only part of the connectivity picture. In practical terms, the client can have a valid IP address and even a valid gateway, but if DNS information is missing, wrong, or unreachable, name-based access still fails. That means DHCP success does not guarantee application usability by hostname.
This is an important user-facing troubleshooting distinction because many people treat 'got an IP address' as if it means every service should work automatically.
Key principle: DHCP assigns IP addresses and other network parameters, including DNS server addresses, to hosts for proper network communication.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
Because DNS service may still be missing, wrong, or unreachable even if DHCP addressing succeeds.
Why this is correct
This is correct because hostname access depends on name resolution as well as basic IP configuration.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
DHCP assigns IP addresses and other network parameters, including DNS server addresses, to hosts for proper network communication.
✗
Because DHCP automatically disables DNS on modern hosts.
Why it's wrong here
This is wrong because DHCP often helps provide DNS settings rather than disabling them.
When this WOULD be correct
If the exam question asked about a scenario where a network administrator intentionally configured DHCP to exclude DNS server information from the DHCP options, then this option could be correct. In such a case, hosts would receive IP addresses but lack DNS settings, leading to name resolution failures.
✗
Because websites by name require PPP authentication on the host.
Why it's wrong here
This is wrong because PPP authentication is unrelated to normal hostname resolution for web access.
When this WOULD be correct
In a different exam scenario where the question asks about the requirements for accessing the internet through a PPP connection, this option could be correct if the question specifies that certain ISPs require PPP authentication for domain name resolution. In that context, a host would need to authenticate via PPP to access websites by name.
✗
Because a DHCP address can be used only for local subnet traffic.
Why it's wrong here
This is wrong because DHCP-assigned addresses can be used normally for routed communication when the rest of the configuration is correct.
When this WOULD be correct
In a scenario where the exam question specifically states that a DHCP server is configured to only assign addresses for local subnet use and does not provide any routing information, this option could be correct. For example, if the question involves a network setup where external traffic is blocked, leading to name resolution failures.
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.
✓Because DNS service may still be missing, wrong, or unreachable even if DHCP addressing succeeds.Correct answer▾
Why this is correct
This is correct because hostname access depends on name resolution as well as basic IP configuration.
✗Because DHCP automatically disables DNS on modern hosts.Wrong answer — click to see why▾
Why this is wrong here
This option is incorrect because DHCP does not disable DNS services on hosts; rather, it provides DNS server information as part of the IP address assignment process. Modern hosts typically configure DNS settings automatically based on the DHCP lease information received.
★ When this WOULD be the correct answer
If the exam question asked about a scenario where a network administrator intentionally configured DHCP to exclude DNS server information from the DHCP options, then this option could be correct. In such a case, hosts would receive IP addresses but lack DNS settings, leading to name resolution failures.
Why candidates choose this
Candidates may find this option tempting due to a misunderstanding of how DHCP and DNS interact, leading them to believe that DHCP could control or disable DNS functionality on hosts, especially if they are not familiar with DHCP configurations.
✗Because websites by name require PPP authentication on the host.Wrong answer — click to see why▾
Why this is wrong here
This option is incorrect because websites by name do not require PPP authentication; they rely on DNS resolution to translate domain names into IP addresses. PPP authentication is unrelated to the ability to access websites by name.
★ When this WOULD be the correct answer
In a different exam scenario where the question asks about the requirements for accessing the internet through a PPP connection, this option could be correct if the question specifies that certain ISPs require PPP authentication for domain name resolution. In that context, a host would need to authenticate via PPP to access websites by name.
Why candidates choose this
Candidates may choose this option due to a misunderstanding of network protocols, confusing PPP authentication with the process of resolving domain names, leading them to incorrectly associate the two concepts.
✗Because a DHCP address can be used only for local subnet traffic.Wrong answer — click to see why▾
Why this is wrong here
This option is incorrect because a DHCP address can be used for more than just local subnet traffic; it allows communication with devices outside the local subnet if proper routing is in place. The failure to reach websites by name is typically related to DNS issues, not the limitations of the DHCP-assigned address.
★ When this WOULD be the correct answer
In a scenario where the exam question specifically states that a DHCP server is configured to only assign addresses for local subnet use and does not provide any routing information, this option could be correct. For example, if the question involves a network setup where external traffic is blocked, leading to name resolution failures.
Why candidates choose this
Candidates may choose this option due to a misunderstanding of DHCP's role, conflating it with routing capabilities and assuming that DHCP limitations directly affect name resolution without considering DNS functionality.
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
Common exam trap: answer the scenario, not the keyword
A frequent exam trap is to assume that if a host receives a correct IP address from DHCP, all network services, including website access by name, must work. This mistake overlooks the fact that DHCP provides multiple parameters, and DNS configuration can be missing, incorrect, or unreachable. Candidates might select answers suggesting DHCP disables DNS or that IP addresses only work locally, which are incorrect. The trap is confusing IP address assignment with full network service availability, leading to wrong conclusions about connectivity issues.
Detailed technical explanation
How to think about this question
Dynamic Host Configuration Protocol (DHCP) is a network management protocol used to automate the process of configuring devices on IP networks. DHCP assigns IP addresses, subnet masks, default gateways, and other network parameters to client devices, enabling them to communicate on the network. However, DHCP also typically provides DNS server information, which is crucial for resolving human-readable domain names into IP addresses. Without proper DNS configuration, even a host with a valid IP address cannot resolve website names to their corresponding IPs.
When a host receives an IP address from DHCP, it also obtains DNS server addresses that the client uses to perform name resolution. If the DNS server information is missing, incorrect, or unreachable, the host will fail to translate domain names into IP addresses, resulting in an inability to reach websites by name. This failure occurs despite the host having a valid IP address and network connectivity, highlighting the importance of DNS as a complementary service to DHCP in IP services.
A common exam trap is assuming that obtaining an IP address via DHCP guarantees full network functionality, including name resolution. In reality, DHCP success only confirms IP configuration, not DNS availability or correctness. Practically, a host might ping an IP address successfully but fail to access websites by name due to DNS issues. This distinction is critical for troubleshooting and understanding how IP services interrelate in Cisco networking environments.
KKey Concepts to Remember
DHCP assigns IP addresses and other network parameters, including DNS server addresses, to hosts for proper network communication.
A host with a valid DHCP-assigned IP address can still fail to resolve domain names if DNS server information is missing or incorrect.
DNS translates human-readable domain names into IP addresses, enabling hosts to access websites by name rather than by numeric IP.
Successful DHCP IP address assignment does not guarantee DNS service availability or correctness, which is essential for name-based access.
Hosts rely on DNS server addresses provided by DHCP to perform name resolution; unreachable DNS servers cause name resolution failures.
Troubleshooting connectivity issues requires verifying both IP configuration from DHCP and DNS server reachability and correctness.
DHCP does not disable DNS on hosts; instead, it typically provides DNS server information as part of the IP configuration.
A DHCP-assigned IP address is valid for both local subnet and routed traffic, assuming correct gateway and routing configurations.
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 assigns IP addresses and other network parameters, including DNS server addresses, to hosts for proper network communication.
Real-world example
How this comes up in practice
A network engineer segments a warehouse floor into three subnets: 20 scanners, 5 printers, and 2 management hosts. Picking the wrong mask wastes addresses or leaves too few usable hosts. Exam questions test whether you can apply CIDR notation, calculate block size, and identify the correct usable-host range for a given prefix.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this 200-301 question in full detail.
Review dHCP assigns IP addresses and other network parameters, including DNS server addresses, to hosts for proper network communication., then practise related 200-301 questions on the same topic to reinforce the concept.
Network Services and Security — This question tests Network Services and Security — DHCP assigns IP addresses and other network parameters, including DNS server addresses, to hosts for proper network communication..
What is the correct answer to this question?
The correct answer is: Because DNS service may still be missing, wrong, or unreachable even if DHCP addressing succeeds. — The host may still fail by name because DHCP-provided addressing is only part of the connectivity picture. In practical terms, the client can have a valid IP address and even a valid gateway, but if DNS information is missing, wrong, or unreachable, name-based access still fails. That means DHCP success does not guarantee application usability by hostname.
This is an important user-facing troubleshooting distinction because many people treat 'got an IP address' as if it means every service should work automatically.
What should I do if I get this 200-301 question wrong?
Review dHCP assigns IP addresses and other network parameters, including DNS server addresses, to hosts for proper network communication., then practise related 200-301 questions on the same topic to reinforce the concept.
Are there clue words in this question I should notice?
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
DHCP assigns IP addresses and other network parameters, including DNS server addresses, to hosts for proper network communication.
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 →
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.
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.