Question 1mediummultiple choice
Full question →mediummultiple choiceObjective-mapped
Which statement best describes why DNS and DHCP are often discussed together in end-host troubleshooting?
Answer choices
Why each option matters
Good practice is not just finding the correct option. The wrong answers often show the exact trap the exam wants you to fall into.
A
Best answer
DHCP helps provide host IP settings, while DNS helps hosts resolve names into addresses.
This is correct because the two services support different but complementary parts of client connectivity.
B
Distractor review
Both services exist only on wireless guest networks.
This is wrong because DNS and DHCP are used broadly across many network types.
C
Distractor review
DNS replaces the need for default gateways supplied by DHCP.
This is wrong because name resolution does not replace Layer 3 next-hop configuration.
D
Distractor review
DHCP is used only for routers and DNS only for switches.
This is wrong because both services are commonly used by end hosts and infrastructure where needed.
Common exam trap
Common exam trap: answer the scenario, not the keyword
A common exam trap is assuming that DNS and DHCP perform the same function or that one replaces the other. For example, some candidates mistakenly believe DNS can replace the default gateway provided by DHCP, confusing name resolution with routing. Others think DHCP is only relevant for routers or that DNS is limited to switches, which is incorrect since both services are essential for end hosts across all network types. This misunderstanding can lead to selecting incorrect answers that mix up IP configuration roles with name resolution roles, causing loss of points on the exam.
Technical deep dive
How to think about this question
Dynamic Host Configuration Protocol (DHCP) and Domain Name System (DNS) are fundamental IP services that support client connectivity in modern networks. DHCP automates the assignment of IP addresses and other essential network parameters such as subnet mask, default gateway, and DNS server addresses to end hosts. This automation eliminates the need for manual IP configuration, reducing errors and simplifying network management. DNS, on the other hand, translates human-friendly domain names into IP addresses, enabling hosts to locate resources and communicate using easily remembered names instead of numeric IP addresses. In Cisco networking and the CCNA context, DHCP and DNS serve complementary roles that are critical for end-host operation. DHCP ensures that a host receives valid Layer 3 addressing and routing information, which is necessary for basic network communication. DNS enables the host to resolve domain names to IP addresses, which is essential for accessing services and applications by name. Troubleshooting connectivity often involves verifying that DHCP has correctly assigned IP settings and that DNS resolution is functioning properly, as failure in either service can cause different but related connectivity issues. A common exam trap is to confuse the roles of DHCP and DNS or to assume they serve the same function. For example, some might incorrectly believe DNS replaces the need for default gateways or that DHCP is limited to certain device types. In reality, DHCP and DNS address distinct layers of network communication—DHCP at the IP configuration level and DNS at the application name resolution level. Understanding this distinction helps avoid misdiagnosis during troubleshooting and ensures accurate answers on the CCNA exam and in practical network scenarios.
KKey Concepts to Remember
- DHCP automatically assigns IP addresses and network configuration parameters to hosts, enabling Layer 3 connectivity without manual setup.
- DNS translates human-readable domain names into IP addresses, allowing hosts to locate and communicate with network resources by name.
- A host requires DHCP-provided IP settings to communicate on the network and DNS to resolve names for application-level access.
- Troubleshooting client connectivity often involves verifying both DHCP address assignment and DNS name resolution functionality.
- DHCP and DNS operate at different layers but work together to ensure end hosts can communicate and access network services.
- Misunderstanding DHCP and DNS roles can lead to incorrect troubleshooting conclusions and exam mistakes.
- Both DHCP and DNS are widely used across wired and wireless networks, not limited to specific device types or network segments.
- DNS does not replace routing functions such as default gateways, which DHCP typically provides as part of IP configuration.
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.
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More questions from this exam
Keep practising from the same exam bank, or move into a focused topic page if this question exposed a weak area.
Question 1
A router learns the same prefix from both OSPF and EIGRP. Which route is installed by default?
Question 2
A router shows this output: R1#show ip ospf neighbor Neighbor ID Pri State Dead Time Address Interface 10.1.1.2 1 FULL/DR 00:00:34 192.168.12.2 GigabitEthernet0/0 10.1.1.3 1 2WAY/DROTHER 00:00:39 192.168.12.3 GigabitEthernet0/0 Which statement is correct?
Question 3
What is the OSPF metric called?
Question 4
A non-root switch has two uplinks toward the root bridge. One path has a lower total STP cost than the other. What role will the lower-cost uplink have?
Question 5
A router interface applies this ACL inbound: 10 deny tcp any any eq 80 20 permit ip any any A user reports that web browsing to a server by IP address fails, but ping works. Which statement best explains the behavior?
Question 6
A router learns route 198.51.100.0/24 from OSPF with AD 110 and also has a static route to the same prefix configured with AD 150. Which route is installed?
FAQ
Questions learners often ask
What does this 200-301 question test?
DHCP automatically assigns IP addresses and network configuration parameters to hosts, enabling Layer 3 connectivity without manual setup.
What is the correct answer to this question?
The correct answer is: DHCP helps provide host IP settings, while DNS helps hosts resolve names into addresses. — DNS and DHCP are often discussed together because both directly affect whether hosts can function normally on the network. In practical terms, DHCP can provide the IP settings a host needs to communicate, and DNS helps that host resolve names into addresses. If either service is missing or misconfigured, users can experience connectivity or usability problems. The key point is that the two services solve different problems, but both are central to normal client operation.
What should I do if I get this 200-301 question wrong?
Then try more questions from the same exam bank and focus on understanding why the wrong options are tempting.
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