Question 1mediummultiple choice
Full question →mediummultiple choiceObjective-mapped
What is the main operational difference between DHCP and DNS?
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
DNS resolves names, while DHCP provides automatic IP configuration.
This is correct because it captures the core operational difference between the services.
B
Distractor review
DNS assigns subnet masks, while DHCP resolves hostnames.
This is wrong because it reverses the roles of the two services.
C
Distractor review
Both are routing protocols used only on routers.
This is wrong because neither DNS nor DHCP is a routing protocol.
D
Distractor review
Neither service is useful on user networks.
This is wrong because both are widely used on user networks.
Common exam trap
Common exam trap: answer the scenario, not the keyword
A common exam trap is reversing the functions of DHCP and DNS, such as believing DNS assigns IP addresses or that DHCP resolves hostnames. This mistake often arises because both services involve IP-related information but serve fundamentally different purposes. Confusing these roles can cause candidates to select incorrect answers or misunderstand troubleshooting scenarios. Remember, DHCP is about automatic IP configuration, while DNS is about translating names to IP addresses. Mislabeling these services leads to flawed network analysis and incorrect exam responses.
Technical deep dive
How to think about this question
Dynamic Host Configuration Protocol (DHCP) and Domain Name System (DNS) are foundational IP services that serve distinct roles in network operations. DHCP automates the process of assigning IP addresses and other network configuration parameters, such as subnet masks and default gateways, to client devices. This automation simplifies device connectivity by eliminating the need for manual IP configuration. DNS, on the other hand, translates human-readable domain names into IP addresses, enabling users and applications to locate network resources by name rather than numeric IP addresses. In the context of Cisco networking and the CCNA exam, understanding the operational difference between DHCP and DNS is critical for troubleshooting and network design. DHCP focuses on address assignment and network parameter distribution, while DNS focuses on name resolution. When a device cannot communicate on a network, determining whether the issue lies with IP configuration (DHCP) or hostname resolution (DNS) is a key diagnostic step. Cisco devices often integrate DHCP relay and DNS forwarding features to support these services efficiently. A common exam trap is confusing the roles of DHCP and DNS, such as assuming DNS assigns IP addresses or that DHCP resolves hostnames. This confusion can lead to incorrect troubleshooting approaches and misinterpretation of network behavior. Practically, DHCP failures result in devices lacking valid IP addresses, preventing network access, whereas DNS failures cause name resolution errors but do not affect IP-level connectivity. Recognizing this distinction is essential for both exam success and real-world network management.
KKey Concepts to Remember
- DHCP automatically assigns IP addresses and network configuration parameters to hosts, enabling devices to join networks without manual setup.
- DNS resolves human-readable domain names into IP addresses, allowing users and applications to locate network resources by name.
- Cisco routers and switches can act as DHCP relay agents to forward DHCP requests across different subnets.
- DNS servers maintain a distributed database of domain names and their corresponding IP addresses to support efficient name resolution.
- Troubleshooting network connectivity requires distinguishing whether issues stem from DHCP address assignment or DNS name resolution failures.
- DHCP operates primarily at Layer 2 and Layer 3 to provide IP configuration, while DNS operates at the application layer to resolve names.
- Misunderstanding DHCP and DNS roles can lead to incorrect assumptions about network problems and ineffective troubleshooting.
- Cisco devices support integration of DHCP and DNS services to streamline IP address management and hostname resolution in enterprise networks.
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.
Related practice questions
Related 200-301 practice-question pages
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
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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 devices to join networks without manual setup.
What is the correct answer to this question?
The correct answer is: DNS resolves names, while DHCP provides automatic IP configuration. — DHCP and DNS solve different problems. In plain language, DHCP automatically gives hosts the network settings they need to join the network, such as an IP address and default gateway. DNS helps resolve hostnames into IP-related information so users and applications can find systems by name. These are both core services, but they solve different problems. This distinction matters because many troubleshooting patterns depend on understanding whether the issue is address assignment or name resolution. The correct answer is the one that keeps those two service roles separate.
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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