Distributed Systems Quiz

What is the primary goal of replica placement in distributed systems?

• To reduce data redundancy

• To improve fault tolerance, data availability, and performance

• To minimize storage costs

• To increase network traffic

Which method of replica placement is computationally expensive?

• Position nodes in a d-dimensional geometric space

• Select the K-th largest autonomous system

• Select best location out of N-K for minimal average distance to clients

• Identify regions with highest density

What is a permanent replica?

• A replica that is dynamically hosted by a client

• A replica that is always present on a process/machine

• A replica that is hosted on request of another server

• A replica that is hosted on request of a client

Which type of replica is hosted on request of a client?

• Permanent replica

• Server-initiated replica

• Client-initiated replica

• Dynamic replica

What is passive replication?

• Propagating update operations to other copies

• Transferring data from one copy to another

• Propagating notifications of updates

• Using leases to switch between pulling and pushing updates

Which protocol involves the server pushing updates to clients?

• Pull-based protocol

• Push-based protocol

• Lease-based protocol

• Notification-based protocol

What does concurrency refer to in distributed systems?

• The ability to handle multiple requests or tasks simultaneously

• The requirement that all nodes see the same data at the same time

• The process of agreeing on a single value among nodes

• The ability to replicate data across multiple nodes

What is strong consistency?

• Ensuring all nodes eventually converge on a consistent view

• Guaranteeing all operations appear to execute atomically and in a globally consistent order

• Allowing different nodes to have different views of the data

• Ensuring all nodes see the same data at the same time

Which consistency model ensures that a process's reads never go backward in time?

• Eventual consistency

• Read-your-writes consistency

• Monotonic read consistency

• Strong consistency

What is a read-write conflict?

• Two concurrent read operations

• A read operation and a write operation acting concurrently

• Two concurrent write operations

• A write operation followed by a read operation