Question 1mediummultiple choice
Full question →mediummultiple choiceObjective-mapped
Which statement best describes the 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
DHCP provides addressing information, while DNS resolves names into IP-related information
This is correct because it describes the core role of each service accurately.
B
Distractor review
DHCP resolves names, while DNS assigns default gateways
This is wrong because it reverses the roles of the two services.
C
Distractor review
Both services exist only for IPv6
This is wrong because both are used in IPv4 and IPv6 environments.
D
Distractor review
Neither service is relevant when switches use VLANs
This is wrong because VLAN usage does not make DHCP and DNS irrelevant.
Common exam trap
Common exam trap: answer the scenario, not the keyword
A frequent exam trap is reversing the roles of DHCP and DNS, such as believing DHCP resolves hostnames or DNS assigns IP addresses. This confusion arises because both services deal with IP-related information but serve fundamentally different purposes. DHCP dynamically assigns IP addressing and network parameters to hosts, while DNS translates domain names into IP addresses. Misinterpreting this can lead to incorrect answers and misunderstanding of network operations, especially in Cisco environments where both protocols are critical but distinct.
Technical deep dive
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. It dynamically assigns IP addresses and other network configuration parameters such as subnet mask, default gateway, and DNS server addresses to client devices. This automation reduces manual configuration errors and simplifies network administration, especially in large networks. DHCP operates primarily at the network layer and uses a lease mechanism to allocate IP addresses temporarily to clients. Domain Name System (DNS) is an application-layer protocol that translates human-friendly domain names into IP addresses required for locating and identifying computer services and devices on the network. DNS maintains a distributed database of domain names and their corresponding IP addresses, enabling users to access resources using names instead of numeric IP addresses. Cisco devices rely on DNS to resolve hostnames in configurations and troubleshooting, making DNS essential for network usability and management. A common exam trap is confusing DHCP and DNS roles, mistakenly thinking DHCP resolves names or DNS assigns IP addresses. DHCP only provides IP configuration parameters, while DNS strictly resolves names to IP addresses. In practical Cisco networking, DHCP and DNS complement each other but do not overlap in function. Misunderstanding this distinction can lead to misconfiguration and troubleshooting errors, especially when verifying connectivity or name resolution issues in routed or switched networks.
KKey Concepts to Remember
- DHCP automatically assigns IP addressing information such as IP address, subnet mask, default gateway, and DNS servers to hosts on a network.
- DNS resolves human-readable domain names into IP addresses, enabling users and applications to locate network resources by name.
- DHCP operates primarily at the network layer to provide dynamic IP configuration, while DNS operates at the application layer to translate names to IP addresses.
- In Cisco networks, DHCP and DNS often work together but serve distinct roles: DHCP configures devices, DNS enables name resolution.
- DHCP leases IP addresses for a limited time, requiring periodic renewal, whereas DNS records are stored in zones and updated as needed.
- DNS supports various record types including A, AAAA, CNAME, and PTR, which help map names to IP addresses and vice versa.
- DHCP can provide additional options like default gateway and DNS server addresses, which are essential for proper network communication.
- Understanding the difference between DHCP and DNS is critical for troubleshooting IP addressing and name resolution issues in Cisco environments.
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 addressing information such as IP address, subnet mask, default gateway, and DNS servers to hosts on a network.
What is the correct answer to this question?
The correct answer is: DHCP provides addressing information, while DNS resolves names into IP-related information — 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. They often work together, but they do not perform the same job.
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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