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COMP 6231 BB 2251 (Summer 2025)

COMP 6231 BB 2251 (Summer 2025)

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Suppose a node creates a Znode for leader election but later crashes. How does ZooKeeper ensure continuity in leadership?

It alerts other nodes and promotes the next lowest Znode as leader.

It pauses all activity until a new leader is manually assigneD.

It reuses the crashed node's Znode with a new ID.

It promotes the oldest node in the system as the new leader.

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Which of the following best explains why distributed systems offer higher reliability than centralized systems?

Each node can operate independently of any coordination.

Failure of one node does not necessarily disrupt the entire system.

Distributed systems have fewer software dependencies.

Distributed systems store all data locally to avoid external failures.

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Which of the following best describes ZooKeeper’s abstraction mechanism using Znodes?

It exposes direct access to physical memory blocks in the system.

It replaces file systems by storing operating system binaries.

It provides a shared tree-like data model for nodes to read/write.

It provides a real-time GUI for leader control and scheduling.

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What makes coordination inherently difficult in distributed systems compared to centralized systems?

Nodes are less powerful and cannot communicate.

Centralized systems are based on microservices, while distributed ones are not.

Distributed systems don’t support shared file storage.

Nodes lack shared memory, can fail independently, and start unaware of others.

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How does ZooKeeper reduce complexity in distributed system coordination?

By allowing nodes to bypass the network for communication

By serving as a centralized abstraction for coordination tasks

By synchronizing all clocks across nodes automatically

By dynamically reassigning hardware resources to overloaded nodes

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What is a fundamental limitation of centralized systems when handling global user traffic?

They are unable to manage multiple user interfaces.

They require persistent internet connectivity at all times.

They introduce latency and represent a single point of failure.

They require expensive licensing for each user.

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What is a critical reason ephemeral Znodes are preferred for tracking live nodes in a system?

They automatically initiate backups when nodes disconnect.

They disappear when the creator node disconnects.

They can hold large volumes of persistent metadatA.

They increase the overall storage capacity of ZooKeeper.

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