HardDesign: Chat System (WhatsApp/Slack)
What does 'delivered' status mean vs 'read' status in WhatsApp?
— Tests your understanding of this concept.
Answer Options
AThey mean the same thing
BDelivered means reached server; Read means recipient opened the message
CDelivered means recipient's device received it; Read means they saw it
DDelivered means sent; Read means downloaded
Want to see the correct answer?
Get the answer with a detailed explanation, plus practice 22+ more Design: Chat System (WhatsApp/Slack) questions with adaptive quizzes and timed interviews.
See the Answer on Guru Sishya →This question is from the Design: Chat System (WhatsApp/Slack) topic (System Design Cases).
More Design: Chat System (WhatsApp/Slack) Questions
Why is WebSocket preferred over HTTP for a chat application?
HardAlice is connected to Chat Server 1. Bob is connected to Chat Server 2. Alice sends Bob a message. How is it delivered?
HardWhy is Cassandra chosen for message storage over PostgreSQL?
HardA chat server crashes while 50,000 users are connected. What happens to their messages and connections?
HardYou have a group chat with 100,000 members (think a public community). Someone sends a message. How do you fan-out?
Hard