Direct exchange in RabbitMQ - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a Direct Exchange in RabbitMQ?

A Direct Exchange routes messages to queues based on an exact match between the message's routing key and the queue's binding key.

beginner

How does a Direct Exchange decide which queue to send a message to?

It sends the message to the queue(s) whose binding key exactly matches the message's routing key.

intermediate

What happens if no queue is bound with a matching routing key in a Direct Exchange?

The message is discarded or returned to the sender if the message is marked as mandatory.

beginner

Show the RabbitMQ command to declare a direct exchange named 'logs_direct'.

rabbitmqadmin declare exchange name=logs_direct type=direct

intermediate

Explain the difference between a Direct Exchange and a Fanout Exchange.

A Direct Exchange routes messages based on exact routing key matches, while a Fanout Exchange broadcasts messages to all bound queues regardless of routing keys.

What type of matching does a Direct Exchange use to route messages?

A Pattern matching with wildcards

B Exact matching of routing keys

C Broadcast to all queues

D Random queue selection

Direct Exchanges route messages only to queues with binding keys that exactly match the routing key.

If a message's routing key is 'error' and a queue is bound with 'error', where will the message go?

A To the queue bound with 'error'

B To all queues

C Nowhere, message is discarded

D To queues with similar keys like 'errors'

The message is routed only to queues with an exact binding key match.

Which command declares a direct exchange named 'my_direct'?

A rabbitmqadmin declare exchange name=my_direct type=direct

B rabbitmqadmin declare exchange name=my_direct type=fanout

C rabbitmqadmin declare queue name=my_direct

D rabbitmqadmin declare exchange name=my_direct type=topic

The command specifies the exchange name and sets its type to direct.

What happens if no queue matches the routing key in a Direct Exchange and the message is not mandatory?

A Message is sent to all queues

B Message is stored in a dead letter queue

C Message is discarded

D Message is returned to sender

Without a matching queue and if not mandatory, the message is discarded.

Which exchange type broadcasts messages to all bound queues regardless of routing key?

A Headers Exchange

B Direct Exchange

C Topic Exchange

D Fanout Exchange

Fanout Exchanges ignore routing keys and send messages to all queues.

Describe how a Direct Exchange routes messages in RabbitMQ.

Think about how the message's routing key compares to the queue's binding key.

Explain the difference between Direct Exchange and Fanout Exchange in RabbitMQ.

One sends messages to specific queues, the other sends to all.