CCNA AI and Network Operations Practice Question

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

• ✗

  BGP

  Why it's wrong here

  Border Gateway Protocol (BGP) is a path-vector routing protocol designed for exchanging reachability and routing policy information between autonomous systems on the internet. It maintains routing tables by propagating NLRI (Network Layer Reachability Information) over TCP port 179, but it transmits binary/TLV-based messages, not a human-readable data-interchange format. Because REST APIs require self-describing, language-agnostic textual representations like JSON or YAML, BGP is completely irrelevant to response payload formatting.

  When this WOULD be correct

  If the question were to ask about networking protocols used for routing data between networks, BGP would be the correct answer. For example, a question might state, 'Which protocol is essential for inter-domain routing on the internet?'

• ✓

  JSON

  Why this is correct

  JSON (JavaScript Object Notation) is the standard data format for REST API responses because it is lightweight, human-readable, and language-independent. Its key-value structure maps directly to objects in most programming languages, making it trivial to parse and generate. Unlike XML, JSON has a compact syntax with minimal overhead, which reduces bandwidth and latency in HTTP transactions. This practical interoperability is why RESTful APIs overwhelmingly default to JSON for serializing payloads.

• ✗

  STP

  Why it's wrong here

  Spanning Tree Protocol (STP) is a network protocol that operates at Layer 2 to prevent broadcast loops in switched Ethernet networks by logically blocking redundant paths. It is fundamentally a bridge/routing mechanism that elects a root bridge and calculates loop-free topologies via BPDU messages. STP has no role in data representation or serialization, and it is never used as a payload format in REST API responses, which require structured text like JSON or XML.

  When this WOULD be correct

  If the exam question asked about protocols used in network communications that ensure loop-free topologies in switched networks, then STP would be the correct answer. For example, a question might ask which protocol is crucial for maintaining network stability in a Layer 2 Ethernet environment.

• ✗

  ARP

  Why it's wrong here

  Address Resolution Protocol (ARP) resolves a known IPv4 address to a physical MAC address on a local area network, typically within a broadcast domain. It operates at the interface between Layer 2 and Layer 3 and relies on broadcast frames and ARP cache tables, not on serializing application data. ARP is a control protocol for network discovery and cannot represent structured API data, so it is entirely unsuitable as a format for RESTful response bodies.

  When this WOULD be correct

  If the exam question asked about protocols used for network communication and their roles in data transmission, ARP could be the correct answer when discussing how devices resolve IP addresses to MAC addresses on a local network.

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.

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?”