IoTF Quiz 8

**Which layer of the TCP/IP model is responsible for application-level protocols like HTTP and MQTT?**

• Network Layer
• Transport Layer
• Application Layer
• Physical Layer

**What is the primary purpose of the HTTP protocol?**

• To enable publish/subscribe messaging for IoT devices
• To transmit hypermedia documents, such as HTML, between web browsers and servers
• To provide a lightweight messaging transport for unreliable networks
• To translate domain names to IP addresses

**Which of the following is a key characteristic of MQTT?**

• It is a request/response protocol
• It uses a publish/subscribe messaging model
• It is primarily used for email transmission
• It is a hierarchical naming system for computers

**What is the role of an MQTT broker?**

• To act as a client that publishes data
• To filter messages based on topics and distribute them to subscribers
• To translate domain names to IP addresses
• To establish direct connections between publishers and subscribers

**Which HTTP method is used to request a representation of a specified resource?**

• POST
• PUT
• GET
• DELETE

**What is the primary advantage of using MQTT over HTTP for IoT devices?**

• MQTT is more suitable for unreliable cellular networks and has a smaller code footprint
• MQTT is faster for transmitting hypermedia documents
• MQTT is better for translating domain names to IP addresses
• MQTT is more secure than HTTP

**Which of the following is an example of an application layer protocol used for email transmission?**

• HTTP
• MQTT
• SMTP
• DNS

**What is the purpose of an API in the context of IoT platforms?**

• To provide a direct connection between publishers and subscribers
• To define a contract for how software will respond to specific requests
• To translate domain names to IP addresses
• To store messages in an MQTT broker

**Which of the following is a characteristic of the HTTP protocol?**

• It is a stateful protocol
• It uses a publish/subscribe messaging model
• It is stateless and works in a request/response fashion
• It is designed for unreliable cellular networks

**What is the role of a subscriber in the MQTT protocol?**

• To publish data to a broker
• To filter messages based on topics
• To receive updates from the broker when a topic's value changes
• To establish direct connections with publishers