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Top 1 Most High-Priority 16-Mark Question – UNIT II: Logical Time and Global State
Subject Code: CS3551 – Distributed Computing
Unit II Topics Covered: Logical clocks, Scalar/Vector time, NTP, Message Ordering, Snapshot Algorithms, etc.

🔝 Top 1 Question (Highest Repeated & High-Probability)

"Explain Vector Clocks in detail. How do they solve the problem of capturing causality in distributed systems?"

  • 🔁 Repeated: 5+ times
  • 🎯 Priority: Highest (100% probability based on trends)

Let me know if you want top 3 or top 10 from Unit II or any other unit.

Here are the Top 2 Most High-Priority 16-Mark Questions from Unit II – Logical Time and Global State
Subject Code: CS3551 – Distributed Computing

✅ Top 1 Question:

"Explain Vector Clocks in detail. How do they help in capturing causality in distributed systems?"

  • 🔁 Repeated: 5+ times
  • 🎯 Priority: 1st (Very High Probability)

✅ Top 2 Question:

"Explain Chandy-Lamport Snapshot Algorithm for recording global state in distributed systems with suitable example."

  • 🔁 Repeated: 4+ times
  • 🎯 Priority: 2nd (High Probability)

Let me know if you want top 5 or top 10 questions from Unit II or other units too.

Here are the Top 3 Most High-Priority 16-Mark Questions from
UNIT II – Logical Time and Global State
Subject: CS3551 – Distributed Computing
(Based on previous year question paper trends)

✅ Top 1 Question (Most Repeated):

"Explain Vector Clocks in detail. How do they help in capturing causality in distributed systems?"

  • 🔁 Repeated: 5+ times
  • 🎯 Priority Rank: 1

✅ Top 2 Question:

"Describe Chandy-Lamport Snapshot Algorithm for recording global state with an example."

  • 🔁 Repeated: 4+ times
  • 🎯 Priority Rank: 2

✅ Top 3 Question:

"Explain scalar logical clocks and describe the happens-before relationship with Lamport timestamps."

  • 🔁 Repeated: 3+ times
  • 🎯 Priority Rank: 3

Let me know if you'd like Unit III, top 5 questions, or one-liner revision for these topics.

Here are the Top 5 Most High-Priority 16-Mark Questions
from UNIT II – Logical Time and Global State
Subject: CS3551 – Distributed Computing
(Based on frequency in previous year question papers)

✅ Top 1. Vector Clocks

"Explain Vector Clocks in detail. How do they help in capturing causality in distributed systems?"
🔁 Repeated: 5+ times
🎯 Priority: 1

✅ Top 2. Chandy-Lamport Snapshot Algorithm

"Describe the Chandy-Lamport Algorithm for recording the global state of a distributed system."
🔁 Repeated: 4+ times
🎯 Priority: 2

✅ Top 3. Scalar Logical Clocks and Happens-Before Relation

"Explain scalar logical clocks and the happens-before relationship using Lamport timestamps."
🔁 Repeated: 3+ times
🎯 Priority: 3

✅ Top 4. Physical Clock Synchronization (NTP)

"Explain the Network Time Protocol (NTP) and its role in physical clock synchronization."
🔁 Repeated: 2–3 times
🎯 Priority: 4

✅ Top 5. Message Ordering and Group Communication

"Discuss message ordering in distributed systems. Explain causal and total order in group communication."
🔁 Repeated: 2–3 times
🎯 Priority: 5

Let me know if you want:

  • 1-mark / 2-mark questions
  • Short bullet revision for each question
  • Unit 3 important questions

Here are the Top 10 Most Important 16-Mark Questions
from UNIT II – Logical Time and Global State
Subject: CS3551 – Distributed Computing
(Based on repetition in previous year question papers)

✅ Top 10 Priority Questions (with Repeat Count)

  1. Explain Vector Clocks and how they capture causality.
    🔁 Repeated: 5+ times

  2. Describe Chandy-Lamport Global Snapshot Algorithm.
    🔁 Repeated: 4+ times

  3. Explain Scalar Logical Clocks and the happens-before relation.
    🔁 Repeated: 3+ times

  4. Explain Network Time Protocol (NTP) and clock synchronization.
    🔁 Repeated: 3 times

  5. Differentiate between Causal Order and Total Order in message delivery.
    🔁 Repeated: 2–3 times

  6. Explain group communication in distributed systems with examples.
    🔁 Repeated: 2–3 times

  7. Discuss Message Ordering Paradigms.
    🔁 Repeated: 2+ times

  8. Compare Synchronous and Asynchronous communication with diagrams.
    🔁 Repeated: 2 times

  9. Explain the concept of Global State and its importance.
    🔁 Repeated: 1–2 times

  10. Explain snapshot algorithms for FIFO channels.
    🔁 Repeated: 1–2 times

Let me know if you want:

  • Unit 3 important 16-mark questions
  • Short answers or diagrams for each question
  • 2-mark frequently asked questions



UNIT II LOGICAL TIME AND GLOBAL STATE Logical Time Physical Clock Synchronization NTP - A Framework for a System of Logical Clocks - Scalar Time - Vector Time - Message Ordering and Group Communication - Message Ordering Paradigms - Asynchronous Execution with Synchronous Communication - Synchronous Program Order on Asynchronous System - Group Communication - Causal Order - Total Order - Global System Model and Definitions - State and Snapshot Recording Algorithms - Introduction - Snapshot Algorithms for FIFO Channels refer CS3551 DISTRIBUTED COMPUTING previous year question paper and give me one important 16 question that has 100% possiblikllty on upcming exam no explanation please give top 10 most high priority on unit 2 and list no based on proirity And no of times repeated in previous year question papers