CCNA Network Services and Security Practice Question
Why is DHCP often preferred over manual addressing on larger user networks?
⚠ Common exam trap
A common exam trap is selecting options that confuse DHCP with DNS or routing protocols. Some candidates mistakenly believe DHCP replaces DNS or removes the need for default gateways. However, DHCP only automates IP configuration; it does not perform name resolution like DNS, nor does it eliminate the requirement for a default gateway. Another trap is assuming routing protocols depend on DHCP, which is incorrect because routing protocols operate independently of IP address assignment methods. Understanding these distinctions is essential to avoid incorrect answers related to IP services in the CCNA exam.
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
✓
It automates host IP configuration and reduces manual effort and mistakes.
DHCP is often preferred because it automates host configuration and reduces both manual work and configuration mistakes. In practical terms, it is far easier to let endpoints receive addresses, masks, gateways, and DNS settings automatically than to configure each device by hand. This improves scale, consistency, and operational efficiency. That is why DHCP is such a common service in enterprise access networks.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
It automates host IP configuration and reduces manual effort and mistakes.
Why this is correct
DHCP automates host IP configuration by centrally assigning addresses, subnet masks, default gateways, and DNS information, which eliminates tedious manual entry on each device. On larger networks, this reduces administrative overhead and the risk of human error, such as typos or duplicate addressing, while also making IP address management more consistent and easier to track.
- ✗
It replaces DNS completely.
Why it's wrong here
DHCP is an address-assignment protocol, not a name-resolution service, so it cannot replace DNS. While DHCP can tell a client which DNS servers to use, DNS is the system that maps domain names to IP addresses and remains essential for human-friendly network communication. Removing DNS would break name resolution entirely, regardless of what DHCP provides.
When this WOULD be correct
In a question that asks about the relationship between DHCP and DNS, where it specifically states that DHCP can provide DNS server information to clients, option B could be correct if it implies that DHCP can fulfill some DNS-related functions in certain contexts.
- ✗
It removes the need for default gateways.
Why it's wrong here
DHCP does not remove the need for a default gateway; hosts must still have a route to reach off-subnet destinations. The protocol can deliver a gateway address as one of its option fields, but the gateway remains essential for any traffic that leaves the local segment. Without it, a networked device can communicate only with hosts on its own subnet.
When this WOULD be correct
In a question focused on network configurations where the context is a specific type of network that does not require inter-network communication, such as a closed-loop system, this option could be correct if it states that devices within that system do not need a default gateway.
- ✗
It is required by all routing protocols.
Why it's wrong here
Routing protocols do not depend on DHCP existing on user networks; they exchange routes using their own neighbor relationships and update messages. DHCP is a client-server mechanism for automating host addressing, whereas routing protocols such as OSPF, EIGRP, and RIP operate among routers. Therefore, DHCP is not a prerequisite for routing protocol operation, and static addressing can work just as well for router interfaces.
When this WOULD be correct
In a question asking which services are mandatory for specific routing protocols to operate effectively, if the question specified that DHCP is necessary for dynamic IP address assignment in a particular routing protocol scenario, then this option could be correct.
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.
✓It automates host IP configuration and reduces manual effort and mistakes.Correct answer▾
Why this is correct
DHCP automates host IP configuration by centrally assigning addresses, subnet masks, default gateways, and DNS information, which eliminates tedious manual entry on each device. On larger networks, this reduces administrative overhead and the risk of human error, such as typos or duplicate addressing, while also making IP address management more consistent and easier to track.
✗It replaces DNS completely.Wrong answer — click to see why▾
Why this is wrong here
Option B is incorrect because DHCP and DNS serve different purposes; DHCP assigns IP addresses while DNS translates domain names to IP addresses. DHCP does not replace the need for DNS in a network.
★ When this WOULD be the correct answer
In a question that asks about the relationship between DHCP and DNS, where it specifically states that DHCP can provide DNS server information to clients, option B could be correct if it implies that DHCP can fulfill some DNS-related functions in certain contexts.
Why candidates choose this
Candidates may choose this option due to a misunderstanding of how DHCP and DNS interact, mistakenly believing that DHCP's role in IP configuration implies it can also handle name resolution tasks, leading to confusion about their distinct functions.
✗It removes the need for default gateways.Wrong answer — click to see why▾
Why this is wrong here
This option is wrong because DHCP does not eliminate the need for default gateways; it can assign them dynamically to clients, but they are still necessary for routing traffic outside the local subnet.
★ When this WOULD be the correct answer
In a question focused on network configurations where the context is a specific type of network that does not require inter-network communication, such as a closed-loop system, this option could be correct if it states that devices within that system do not need a default gateway.
Why candidates choose this
Candidates may choose this option due to a misunderstanding of DHCP's role in network configuration, mistakenly believing that DHCP's automation extends to eliminating the need for default gateways entirely.
✗It is required by all routing protocols.Wrong answer — click to see why▾
Why this is wrong here
This option is wrong because DHCP is not a requirement for any routing protocols; routing protocols can function independently of DHCP. Routing protocols focus on the exchange of routing information rather than IP address assignment.
★ When this WOULD be the correct answer
In a question asking which services are mandatory for specific routing protocols to operate effectively, if the question specified that DHCP is necessary for dynamic IP address assignment in a particular routing protocol scenario, then this option could be correct.
Why candidates choose this
Candidates may choose this option due to a misunderstanding of network services, conflating the roles of DHCP and routing protocols, leading them to believe that DHCP is essential for routing 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?”
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.
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Key term
DHCP
Dynamic Host Configuration Protocol (DHCP) automatically assigns IP addresses and network settings to devices on a network, so they can communicate without manual configuration.
Key term
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A Fully Qualified Domain Name is the complete and unambiguous website or server name that includes the host, domain, and top-level domain, leaving no room for guesswork.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.