Quick Answer
The answer is DHCP, or Dynamic Host Configuration Protocol, which is the correct service to configure for automatic IP addressing on the branch routers. DHCP is purpose-built to centrally manage and assign IP addresses, subnet masks, default gateways, and DNS server values to client devices, eliminating the need for manual configuration on each endpoint. On the CCNA 200-301 v2 exam, this concept tests your understanding of network services and how DHCP operates at the application layer to simplify IP address management in a small office or enterprise LAN. A common trap is confusing DHCP with DNS or static routing, but remember that DHCP is the only service that dynamically hands out the full addressing suite—IP, gateway, and DNS—while DNS only resolves names to IPs. For a memory tip, think of DHCP as the “auto-address butler” that serves up a complete network welcome package to every device that knocks.
This 200-301 practice question tests your understanding of network services and security. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. A key principle to apply: dHCP automatically assigns IP addresses, subnet masks, default gateways, and DNS server information to clients to enable network connectivity without manual configuration.. 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.
A small office wants branch routers to automatically hand out IP addresses, default gateway values, and DNS servers to clients. Which service should be configured?
DNS
Why wrong: DNS resolves names to IP addresses.
DHCP
DHCP supplies addressing parameters to clients.
NTP
Why wrong: NTP synchronizes time, not addresses.
TACACS+
Why wrong: TACACS+ handles AAA, not client addressing.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
DHCP
DHCP is built for this exact job. It centrally provides addressing details so endpoints do not need to be configured by hand.
Key principle: DHCP automatically assigns IP addresses, subnet masks, default gateways, and DNS server information to clients to enable network connectivity without manual configuration.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
DNS
DHCP
NTP
Why it's wrong here
NTP synchronizes time, not addresses.
When this WOULD be correct
In a scenario where the question asks about synchronizing time across devices in a network, such as ensuring that all routers and servers have the same time for logging and security purposes, NTP would be the correct answer.
TACACS+
When this WOULD be correct
If the question asked about securing access to network devices and managing user permissions, then TACACS+ would be the correct answer. For example, a scenario might involve configuring user access controls for routers and switches in a corporate environment.
Option-by-option analysis
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.
Why this is correct
DHCP supplies addressing parameters to clients.
Why this is wrong here
DNS (Domain Name System) is responsible for resolving domain names to IP addresses, not for assigning IP addresses or providing gateway and DNS information to clients. Therefore, it cannot fulfill the requirements of the question.
★ When this WOULD be the correct answer
If the question asked about a service that resolves domain names for clients in a network, such as 'Which service translates domain names into IP addresses for client devices?', then DNS would be the correct answer.
Why candidates choose this
Candidates may confuse DNS with DHCP due to their roles in network configuration, thinking that both are involved in providing necessary information to clients, leading them to mistakenly select DNS.
Why this is wrong here
NTP (Network Time Protocol) is used to synchronize clocks across devices in a network, not for assigning IP addresses or providing gateway and DNS information to clients. Therefore, it does not fulfill the requirements of the question.
★ When this WOULD be the correct answer
In a scenario where the question asks about synchronizing time across devices in a network, such as ensuring that all routers and servers have the same time for logging and security purposes, NTP would be the correct answer.
Why candidates choose this
Candidates may confuse NTP with DHCP due to both being essential network services, leading them to mistakenly believe that NTP could also handle IP address assignment tasks.
Why this is wrong here
TACACS+ is a protocol used for network device authentication, authorization, and accounting, not for assigning IP addresses or network configuration to clients. Therefore, it does not meet the requirements of the question.
★ When this WOULD be the correct answer
If the question asked about securing access to network devices and managing user permissions, then TACACS+ would be the correct answer. For example, a scenario might involve configuring user access controls for routers and switches in a corporate environment.
Why candidates choose this
Candidates might confuse TACACS+ with DHCP due to both being related to network management, leading them to mistakenly believe that TACACS+ could also handle IP address assignment tasks.
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
A common exam trap is confusing DHCP with other network services like DNS, NTP, or TACACS+. DNS only resolves domain names to IP addresses and does not assign IP addresses or default gateways. NTP synchronizes time across devices but does not handle IP addressing. TACACS+ is an AAA protocol used for authentication and authorization, not for assigning IP addresses or network parameters. Selecting any of these instead of DHCP leads to incorrect answers because they do not fulfill the requirement of automatically handing out IP addresses and related network configuration to clients.
Detailed technical explanation
Dynamic Host Configuration Protocol (DHCP) is a network management protocol used to automate the process of configuring devices on IP networks. DHCP servers assign IP addresses, subnet masks, default gateways, and DNS server information to client devices, enabling them to communicate on the network without manual configuration. This automation reduces errors and administrative overhead, especially in environments with many devices or frequent changes. In Cisco networking and the CCNA context, DHCP is essential for branch routers or small office networks to provide IP addressing and related parameters dynamically. When a client device connects to the network, it sends a DHCPDISCOVER broadcast. The DHCP server responds with a DHCPOFFER containing configuration details. The client then requests the offered parameters with a DHCPREQUEST, and the server finalizes the lease with a DHCPACK. This process ensures clients receive consistent and valid network settings, including the default gateway and DNS servers, which are critical for routing and name resolution. A common exam trap is confusing DHCP with other network services like DNS or NTP. While DNS resolves domain names to IP addresses and NTP synchronizes time, neither provides IP addressing or gateway configuration. TACACS+ is an AAA protocol unrelated to client IP configuration. Understanding DHCP’s role in IP services prevents misinterpretation of questions asking about automatic IP address assignment and related parameters. Practically, DHCP simplifies network management and supports scalability in Cisco environments by centralizing IP address allocation and reducing manual errors.
Key takeaway
DHCP automatically assigns IP addresses, subnet masks, default gateways, and DNS server information to clients to enable network connectivity without manual configuration.
Real-world example
A junior network technician can log in to a core router but cannot reach the enable prompt or configuration mode. The AAA server is authenticating the login — but the authorisation policy only grants privilege level 1, not 15. Authentication (who you are) is working; authorisation (what you can do) is not.
What to study next
Review dHCP automatically assigns IP addresses, subnet masks, default gateways, and DNS server information to clients to enable network connectivity without manual configuration., then practise related 200-301 questions on the same topic to reinforce the concept.
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FAQ
Network Services and Security — This question tests Network Services and Security — DHCP automatically assigns IP addresses, subnet masks, default gateways, and DNS server information to clients to enable network connectivity without manual configuration..
The correct answer is: DHCP — DHCP is built for this exact job. It centrally provides addressing details so endpoints do not need to be configured by hand.
Review dHCP automatically assigns IP addresses, subnet masks, default gateways, and DNS server information to clients to enable network connectivity without manual configuration., then practise related 200-301 questions on the same topic to reinforce the concept.
DHCP automatically assigns IP addresses, subnet masks, default gateways, and DNS server information to clients to enable network connectivity without manual configuration.
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Last reviewed: May 17, 2026
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