COA Architecture and Services 2

Question 1

Which OpenStack service is responsible for providing a multi-tenant cloud messaging service?

Accepted Answer

Zaqar

Answer

Zaqar is the OpenStack messaging service that provides multi-tenant cloud queuing and notification capabilities.

Question 2

In OpenStack's shared-nothing architecture, what is the primary communication mechanism between services?

Accepted Answer

Message queue (AMQP)

Answer

OpenStack services communicate asynchronously via AMQP message queues (typically RabbitMQ), enabling a loosely coupled shared-nothing architecture.

Question 3

Which component of Keystone is responsible for storing and retrieving tokens?

Accepted Answer

Token backend

Answer

The Keystone token backend manages the creation, storage, and validation of authentication tokens.

Question 4

What is the role of the Nova conductor service?

Accepted Answer

Acts as a database proxy to eliminate direct DB access from compute nodes

Answer

Nova conductor acts as a database proxy so compute nodes never access the database directly, improving security and scalability.

Question 5

Which OpenStack project provides a DNS-as-a-Service capability?

Accepted Answer

Designate

Answer

Designate is the OpenStack DNS-as-a-Service project that manages DNS zones and records.

(COA) Certified OpenStack Administrator Exam Practice Test