"Keep-alive mechanism verifying the connection is live" — in WebSocket, this describes which of the following?

ping/pong frames: Keep-alive mechanism verifying the connection is live.

"Destination for messages that repeatedly fail processing" — in WebSocket, this describes which of the following?

dead letter queue: Destination for messages that repeatedly fail processing.

"HTTP status completing a WebSocket upgrade" — in WebSocket, this describes which of the following?

101 Switching Protocols: HTTP status completing a WebSocket upgrade.

"Definition of an event's structure used for validation" — in WebSocket, this describes which of the following?

event schema: Definition of an event's structure used for validation.

Which of the following statements about WebSocket is TRUE?

The 101 Switching Protocols response completes the handshake.

Identify the accurate statement about WebSocket:

The 101 Switching Protocols response completes the handshake.

"Named stream of events consumed by subscribers" — in WebSocket, this describes which of the following?

Kafka topic: Named stream of events consumed by subscribers.

Which statement correctly describes WebSocket?

Both sides can push messages at any time after the handshake.

"TLS-secured WebSocket scheme" — in WebSocket, this describes which of the following?

wss://: TLS-secured WebSocket scheme.

In the context of WebSocket, which of the following is a correct statement?

Both sides can push messages at any time after the handshake.

WebSocket & Async APIs interview questions — Medium

149 medium-level WebSocket & Async APIs questions from our API Testing bank, each with the correct answer and an explanation of why it is correct.

What this covers

WebSocket & Async APIs appears throughout API Testing interviews. At medium level, interviewers are typically checking that you have used it in practice: what you configured, what broke, and how you knew it worked. Work through these, then explain your answer out loud; the second part is what interviews actually test.

Other levels:Hard (75)Easy (74)

20 example questions

1. "Keep-alive mechanism verifying the connection is live" — in WebSocket, this describes which of the following?
- A. Ping/pong frames.correct
- B. Wss://.
- C. Dead letter queue.
- D. 101 Switching Protocols.
Why: ping/pong frames: Keep-alive mechanism verifying the connection is live.
2. "Destination for messages that repeatedly fail processing" — in WebSocket, this describes which of the following?
- A. 101 Switching Protocols.
- B. Wss://.
- C. Ping/pong frames.
- D. Dead letter queue.correct
Why: dead letter queue: Destination for messages that repeatedly fail processing.
3. "HTTP status completing a WebSocket upgrade" — in WebSocket, this describes which of the following?
- A. Event schema.
- B. Ping/pong frames.
- C. Backpressure.
- D. 101 Switching Protocols.correct
Why: 101 Switching Protocols: HTTP status completing a WebSocket upgrade.
4. "Definition of an event's structure used for validation" — in WebSocket, this describes which of the following?
- A. 101 Switching Protocols.
- B. Kafka topic.
- C. Event schema.correct
- D. Dead letter queue.
Why: event schema: Definition of an event's structure used for validation.
5. Which of the following statements about WebSocket is TRUE?
- A. A WebSocket connection starts as an HTTP request upgraded via the Upgrade header.correct
- B. Message queues can only be tested with a web browser.
- C. AsyncAPI is a load-testing tool, not a specification.
- D. WebSocket connections close automatically after every single message.
Why: The 101 Switching Protocols response completes the handshake.
6. Identify the accurate statement about WebSocket:
- A. Server-Sent Events allow the client to stream data to the server.
- B. A WebSocket connection starts as an HTTP request upgraded via the Upgrade header.correct
- C. The WebSocket handshake uses FTP rather than HTTP.
- D. WebSocket connections close automatically after every single message.
Why: The 101 Switching Protocols response completes the handshake.
7. "Named stream of events consumed by subscribers" — in WebSocket, this describes which of the following?
- A. Ping/pong frames.
- B. Backpressure.
- C. Event schema.
- D. Kafka topic.correct
Why: Kafka topic: Named stream of events consumed by subscribers.
8. Which statement correctly describes WebSocket?
- A. WebSockets allow only the client to send messages, never the server.
- B. AsyncAPI is a load-testing tool, not a specification.
- C. The WebSocket handshake uses FTP rather than HTTP.
- D. WebSocket provides full-duplex, persistent communication over a single TCP connection.correct
Why: Both sides can push messages at any time after the handshake.
9. "TLS-secured WebSocket scheme" — in WebSocket, this describes which of the following?
- A. Dead letter queue.
- B. Wss://.correct
- C. Event schema.
- D. Kafka topic.
Why: wss://: TLS-secured WebSocket scheme.
10. In the context of WebSocket, which of the following is a correct statement?
- A. Message queues can only be tested with a web browser.
- B. Server-Sent Events allow the client to stream data to the server.
- C. WebSockets allow only the client to send messages, never the server.
- D. WebSocket provides full-duplex, persistent communication over a single TCP connection.correct
Why: Both sides can push messages at any time after the handshake.
11. In WebSocket, which of the following is described as: "Destination for messages that repeatedly fail processing"?
- A. Backpressure.
- B. Ping/pong frames.
- C. Kafka topic.
- D. Dead letter queue.correct
Why: dead letter queue: Destination for messages that repeatedly fail processing.
12. Which WebSocket concept matches this description: "Definition of an event's structure used for validation"?
- A. Event schema.correct
- B. 101 Switching Protocols.
- C. Backpressure.
- D. Ping/pong frames.
Why: event schema: Definition of an event's structure used for validation.
13. In WebSocket, which of the following is described as: "Mechanism handling consumers slower than producers"?
- A. Ping/pong frames.
- B. Kafka topic.
- C. Backpressure.correct
- D. Wss://.
Why: backpressure: Mechanism handling consumers slower than producers.
14. Which WebSocket concept matches this description: "HTTP status completing a WebSocket upgrade"?
- A. Wss://.
- B. Backpressure.
- C. 101 Switching Protocols.correct
- D. Event schema.
Why: 101 Switching Protocols: HTTP status completing a WebSocket upgrade.
15. Which WebSocket concept matches this description: "Keep-alive mechanism verifying the connection is live"?
- A. 101 Switching Protocols.
- B. Dead letter queue.
- C. Ping/pong frames.correct
- D. Kafka topic.
Why: ping/pong frames: Keep-alive mechanism verifying the connection is live.
16. Which WebSocket concept matches this description: "Destination for messages that repeatedly fail processing"?
- A. 101 Switching Protocols.
- B. Dead letter queue.correct
- C. Kafka topic.
- D. Event schema.
Why: dead letter queue: Destination for messages that repeatedly fail processing.
17. Which WebSocket concept matches this description: "Mechanism handling consumers slower than producers"?
- A. Backpressure.correct
- B. Ping/pong frames.
- C. Kafka topic.
- D. 101 Switching Protocols.
Why: backpressure: Mechanism handling consumers slower than producers.
18. In WebSocket, which of the following is described as: "Definition of an event's structure used for validation"?
- A. Kafka topic.
- B. Backpressure.
- C. Event schema.correct
- D. Dead letter queue.
Why: event schema: Definition of an event's structure used for validation.
19. In WebSocket, which of the following is described as: "HTTP status completing a WebSocket upgrade"?
- A. 101 Switching Protocols.correct
- B. Ping/pong frames.
- C. Dead letter queue.
- D. Wss://.
Why: 101 Switching Protocols: HTTP status completing a WebSocket upgrade.
20. In WebSocket, which of the following is described as: "Keep-alive mechanism verifying the connection is live"?
- A. Dead letter queue.
- B. 101 Switching Protocols.
- C. Wss://.
- D. Ping/pong frames.correct
Why: ping/pong frames: Keep-alive mechanism verifying the connection is live.

WebSocket & Async APIs interview questions — Medium

What this covers

20 example questions

1. "Keep-alive mechanism verifying the connection is live" — in WebSocket, this describes which of the following?

2. "Destination for messages that repeatedly fail processing" — in WebSocket, this describes which of the following?

3. "HTTP status completing a WebSocket upgrade" — in WebSocket, this describes which of the following?

4. "Definition of an event's structure used for validation" — in WebSocket, this describes which of the following?

5. Which of the following statements about WebSocket is TRUE?

6. Identify the accurate statement about WebSocket:

7. "Named stream of events consumed by subscribers" — in WebSocket, this describes which of the following?

8. Which statement correctly describes WebSocket?

9. "TLS-secured WebSocket scheme" — in WebSocket, this describes which of the following?

10. In the context of WebSocket, which of the following is a correct statement?

11. In WebSocket, which of the following is described as: "Destination for messages that repeatedly fail processing"?

12. Which WebSocket concept matches this description: "Definition of an event's structure used for validation"?

13. In WebSocket, which of the following is described as: "Mechanism handling consumers slower than producers"?

14. Which WebSocket concept matches this description: "HTTP status completing a WebSocket upgrade"?

15. Which WebSocket concept matches this description: "Keep-alive mechanism verifying the connection is live"?

16. Which WebSocket concept matches this description: "Destination for messages that repeatedly fail processing"?

17. Which WebSocket concept matches this description: "Mechanism handling consumers slower than producers"?

18. In WebSocket, which of the following is described as: "Definition of an event's structure used for validation"?

19. In WebSocket, which of the following is described as: "HTTP status completing a WebSocket upgrade"?

20. In WebSocket, which of the following is described as: "Keep-alive mechanism verifying the connection is live"?

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