Question 1,307 of 1,389
CCNA AI and Network Operations Practice Question
Which two statements accurately describe controller-based networking at the CCNA level?
⚠ Common exam trap
A frequent exam trap is selecting answers that imply controllers replace all network devices or that they are unrelated to automation. Some candidates mistakenly believe that controller-based networking removes the need for switches and routers, which is incorrect because these devices still perform actual packet forwarding. Others overlook the role of controllers in automation, ignoring that controllers expose northbound APIs specifically to enable external applications and automation tools to interact with the network. Misunderstanding these points can lead to choosing incorrect options that overstate or understate the controller’s role.
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
✓
A controller can centralize management and policy logic.
A software-defined networking (SDN) controller centralizes management, policy logic, and network intelligence, reducing manual per-device configuration. Option B is correct because northbound APIs (e.g., REST APIs) allow external applications, orchestration tools, and automation scripts to interact with the controller for dynamic network control. Option C is wrong because controllers do not eliminate switches and routers; these devices still forward packets based on instructions from the controller. Option D is wrong because controllers are fundamental to network automation—they provide programmable interfaces and centralized logic that enable automated provisioning and policy enforcement. Option E is wrong because modern controllers use secure communication channels such as HTTPS, SSH, or TLS, not Telnet (which is insecure and rarely used in controller architectures).
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
A controller can centralize management and policy logic.
Why this is correct
A controller centralizes management and policy logic, providing a single point from which administrators define and enforce network-wide configurations, security policies, and quality-of-service rules. This abstraction simplifies operations compared with per-device CLI management, allowing consistent policy application across many switches and routers without replacing the forwarding infrastructure itself.
- ✓
Northbound APIs can allow external applications to communicate with the controller.
Why this is correct
Northbound APIs act as the interface between the controller and external software, typically using RESTful, RESTCONF, or gRPC calls so applications can retrieve telemetry, adjust settings, or orchestrate connectivity. Because these APIs abstract low-level device details, third-party tools and custom scripts can programmatically control the network while the controller translates those requests into device-specific configurations.
- ✗
Controllers eliminate all need for switches and routers.
Why it's wrong here
Controllers do not make switches and routers obsolete; they centralize control-plane decision-making and management, but the underlying devices still handle the data plane, physically forwarding frames and packets. A controller must communicate with those devices, often through southbound protocols, to install forwarding rules or policies, so the physical or virtual network elements remain essential to traffic delivery.
When this WOULD be correct
In a question focused on theoretical networking concepts where the context implies a fully virtualized network environment, one might argue that in such a scenario, traditional switches and routers could be deemed unnecessary. This could be framed in a way that emphasizes a completely software-defined approach.
- ✗
Controllers are unrelated to automation.
Why it's wrong here
Controllers are fundamentally tied to automation because they expose programmatic interfaces, support intent-based configuration, and integrate with orchestration platforms, enabling tasks like zero-touch provisioning, automated policy deployment, and continuous compliance checks. Far from being unrelated, automation is a primary reason organizations adopt controller-based architectures, since the centralized controller can repeatedly apply standardized configurations without manual per-device intervention.
When this WOULD be correct
In a question specifically focused on traditional networking concepts, where the role of automation is not mentioned, this option could be correct if it asked about the functions of legacy networking devices that do not utilize controller-based architectures.
- ✗
Controllers require Telnet for all communication.
Why it's wrong here
Controllers do not require Telnet for all communication; modern controller architectures rely on secure, standards-based southbound protocols like NETCONF, RESTCONF, OpenFlow, or gRPC to manage network devices, and on encrypted northbound APIs for application interaction. Telnet is an insecure legacy terminal emulation protocol that lacks encryption, making it unsuitable as a universal communication method in contemporary controller-based networks.
When this WOULD be correct
In a different exam scenario focused on legacy systems or specific configurations, a question might state that a particular controller only supports Telnet for communication due to compatibility with older network devices. In that case, option E would 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.
✓A controller can centralize management and policy logic.Correct answer▾
Why this is correct
A controller centralizes management and policy logic, providing a single point from which administrators define and enforce network-wide configurations, security policies, and quality-of-service rules. This abstraction simplifies operations compared with per-device CLI management, allowing consistent policy application across many switches and routers without replacing the forwarding infrastructure itself.
✗Controllers eliminate all need for switches and routers.Wrong answer — click to see why▾
Why this is wrong here
This option is incorrect because controllers do not eliminate the need for switches and routers; rather, they work alongside them to enhance network management and automation. Controllers centralize control but do not replace the physical devices that forward traffic.
★ When this WOULD be the correct answer
In a question focused on theoretical networking concepts where the context implies a fully virtualized network environment, one might argue that in such a scenario, traditional switches and routers could be deemed unnecessary. This could be framed in a way that emphasizes a completely software-defined approach.
Why candidates choose this
Candidates may find this option tempting due to a misunderstanding of the role of controllers, mistakenly believing that advanced networking technologies can fully replace traditional hardware, especially in discussions about software-defined networking.
✗Controllers are unrelated to automation.Wrong answer — click to see why▾
Why this is wrong here
This option is incorrect because controllers are fundamentally tied to automation and orchestration in networking, enabling efficient management and configuration of network devices. They play a crucial role in automating tasks, which contradicts the statement that they are unrelated to automation.
★ When this WOULD be the correct answer
In a question specifically focused on traditional networking concepts, where the role of automation is not mentioned, this option could be correct if it asked about the functions of legacy networking devices that do not utilize controller-based architectures.
Why candidates choose this
Candidates may choose this option due to a misunderstanding of the role of controllers in modern networking, confusing them with traditional networking practices where automation was less prevalent, leading to the assumption that controllers are not related to automation.
✗Controllers require Telnet for all communication.Wrong answer — click to see why▾
Why this is wrong here
This option is wrong because controllers can communicate using various protocols, such as REST APIs or NETCONF, and do not require Telnet specifically for communication. Telnet is often considered insecure and is not a standard for modern controller communication.
★ When this WOULD be the correct answer
In a different exam scenario focused on legacy systems or specific configurations, a question might state that a particular controller only supports Telnet for communication due to compatibility with older network devices. In that case, option E would be correct.
Why candidates choose this
Candidates may choose this option due to a misunderstanding of traditional network management practices, where Telnet was commonly used, leading them to incorrectly associate it with all types of network controllers.
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?”
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Last reviewed: May 17, 2026
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.
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