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WorksheetsQuiz on Distributed Systems
Total questions: 70
Worksheet time: 35mins
What is a false assumption often made in distributed systems?
The topology does not change
The network is reliable
The network is secure
The network is homogeneous
What is the main characteristic of sensor networks?
Nodes with high computational capacity
Nodes with unlimited power source
Many nodes with simple capacity
Few nodes with high capacity
What is the main focus of mobile computing systems?
Stable communication
Direct resource sharing between devices
Stationary servers
Mobile devices
What is the core element of ubiquitous systems?
Complex interaction
Limited autonomy
Continuous interaction
Limited intelligence
What is the main issue with applying replication in distributed systems?
Increased consistency
Global synchronization
Improved performance
Reduced complexity
What is the primary goal of security mechanisms in distributed systems?
Ensuring authorized access
Providing unlimited bandwidth
Exposing sensitive data
Ensuring high latency
What is the purpose of middleware in integrating applications?
Providing communication facilities
Reducing network reliability
Increasing complexity
Limiting application interactions
What is the main challenge in achieving distribution transparency?
Hiding network latencies
Ensuring zero latency
Fully hiding failures
Keeping replicas up-to-date
What is the key characteristic of grid computing?
Homogeneous resources
Dispersed across organizations
Centralized management
Limited scalability
What is the main issue with distributed shared memory systems?
High performance
Ease of programming
Low complexity
Inability to compete with multiprocessors
What is the purpose of a Transaction Processing Monitor (TPM) in distributed systems?
Coordinating execution of transactions
Optimizing bandwidth usage
Ensuring zero latency
Managing network security
What is the main challenge in scaling distributed systems?
Handling replication inconsistencies
Ensuring global synchronization
Addressing geographical scalability
Reducing complexity
What is the distinguishing feature of mobile cloud computing?
Cloud-based services
Mobile devices
Stationary servers
Direct resource sharing between devices
What is the primary characteristic of distributed pervasive systems?
Large memory capacity
Stationary nodes
Limited autonomy
Continuous interaction with users
What is the main focus of developing distributed systems?
Ensuring reliability and security
Making false assumptions
Increasing complexity
Avoiding patching mistakes
What is the primary goal of security mechanisms in distributed systems?
Ensuring authorized access
Providing unlimited bandwidth
Exposing sensitive data
Ensuring high latency
What is the main challenge in achieving distribution transparency?
Hiding network latencies
Ensuring zero latency
Fully hiding failures
Keeping replicas up-to-date
What is the main issue with applying replication in distributed systems?
Increased consistency
Global synchronization
Improved performance
Reduced complexity
What is the primary focus of cloud computing systems?
Ensuring data privacy
Centralized data storage
Unlimited bandwidth
Dynamic resource allocation
What is the key characteristic of edge computing?
Centralized processing
Low latency
Homogeneous devices
Static resource allocation
What is the main challenge in ensuring fault tolerance in distributed systems?
Handling network latencies
Ensuring zero latency
Dealing with node failures
Limiting scalability
What is a distributed system defined as?
A system where components never interact
A system with multiple computers but no interconnections
A system where components communicate by passing messages
A system with a single computer handling all tasks
What is a distributed system defined as?
A system where components never interact
A system with multiple computers but no interconnections
A system where components communicate by passing messages
A system with a single computer handling all tasks
What are some trends influencing the development of distributed systems?
Limited use of mobile devices
Decrease in network connectivity
Rise of standalone computing
Pervasive networking and modern internet
How can performance bottlenecks be avoided in scalable distributed systems?
By reducing the number of users
By implementing distribution and replication techniques
By increasing the number of centralized servers
By limiting the resources available
What is the role of transparency in distributed systems?
To confuse users about system operations
To hide the separation of components from users
To slow down system performance
To limit user access to resources
What is the main goal of middleware in distributed systems?
To limit scalability
To provide a uniform computational model
To introduce more heterogeneity
To mask failures
What are the consequences of using replication and caching in scalable distributed systems?
Increased complexity and reduced performance
Improved performance and reduced redundancy
Enhanced fault tolerance and improved reliability
Decreased scalability and increased cost
What are the challenges faced by distributed computing systems?
Absence of concurrency
Failure handling
Lack of security concerns
Homogeneity in networks
What is the purpose of a distributed transaction system?
To wrap multiple requests into a single larger request
To avoid resource sharing
To execute requests independently
To limit communication between components
What is the main goal of cluster computing systems?
To avoid parallel processing
To reduce computational resources
To limit the number of connected computers
To run single programs on multiple machines
What are the nonfunctional requirements affecting the quality of service in distributed systems?
Heterogeneity, openness, and concurrency
Reliability, security, and adaptability
Failure handling, transparency, and quality of service
Performance, scalability, and transparency
What are the types of communication middleware used in distributed systems?
Centralized Procedure Calls (CPC), Centralized Method Invocation (CMI), and Communication-Oriented Middleware (COM)
Local Procedure Calls (LPC), Local Method Invocation (LMI), and Message-Based Middleware (MBM)
Remote Procedure Calls (RPC), Remote Method Invocation (RMI), and Message-Oriented Middleware (MOM)
Distributed Procedure Calls (DPC), Distributed Method Invocation (DMI), and Data-Oriented Middleware (DOM)
What are the main challenges of heterogeneity in distributed systems?
Uniformity in networks
Consistency in interfaces
Security concerns
Differences in networks, hardware, and programming languages
What is the impact of mobile and ubiquitous computing on daily tasks?
Decreased efficiency and convenience
Limited access to computational devices
Enhanced performance and flexibility
Reduced reliance on technology
What are the types of distributed systems?
Centralized Computing Systems, Distributed Systems, and Embedded Computing Systems
Client-Server Systems, Peer-to-Peer Systems, and Mainframe Systems
Cluster Computing Systems, Grid Computing Systems, and Sensor Networks
Distributed Computing Systems, Distributed Systems, and Distributed Embedded Systems
What are the main fallacies associated with distributed systems?
The network is reliable, topology doesn't change, and there is one administrator
The network is reliable, latency is zero, and bandwidth is infinite
Topology doesn't change, there is one administrator, and transport cost is zero
The network is secure, there is one administrator, and the network is homogeneous
What are the advantages of using message-oriented middleware in distributed systems?
Increased latency and reduced reliability
Enhanced scalability and fault tolerance
Decreased message delivery and increased complexity
Improved security and reduced performance
How does distributed computing differ from traditional centralized computing?
Centralized computing has higher fault tolerance
Distributed computing has lower scalability
Centralized computing is more cost-effective
Distributed computing involves multiple interconnected computers
What role does fault tolerance play in ensuring reliability in distributed systems?
Fault tolerance increases system complexity
Fault tolerance reduces system performance
Fault tolerance improves system availability
Fault tolerance limits system scalability
What are the three ways in which distributed system design can be effectively communicated?
Abstract Models, Concrete Models, Hybrid Models
Hardware Models, Software Models, Network Models
Physical Models, Architectural Models, Fundamental Models
Logical Models, Architectural Models, Middleware Solutions
What do physical models of distributed systems capture?
Middleware solutions and architectural patterns
Computational elements and communication tasks
Hardware composition and interconnecting networks
Abstract perspective of a distributed system
Which generation of distributed systems emerged in the 1990s with an extensible set of nodes interconnected by a network of networks?
Internet scale distributed systems
Early distributed systems
Contemporary distributed systems
Future distributed systems
What is the purpose of architectural models in distributed systems?
To define the physical infrastructure of the system
To lay a foundation for understanding different architectural models
To provide security to the distributed system
To manage the middleware solutions
What is the role of threads in a distributed system from a system-oriented perspective?
Threads are individual machines or devices in a distributed system
Threads are smaller units of a process that can be executed concurrently within the same process
Threads are instances of a program that is being executed
Threads are endpoints of communication
What is the key technique of indirect communication in distributed systems?
Message passing primitives
Socket programming
Remote Procedure Call
Group communication
Which architectural style describes a distributed system where all processes play similar roles and interact cooperatively as peers?
Client-Server architecture
Brokerage pattern
Peer-to-Peer architecture
Layered architecture
What is the purpose of the Layering architectural pattern in distributed systems?
To provide recurring structures that work well in certain circumstances
To provide a convenient programming model to application programmers
To organize functionality in a given layer and place it onto appropriate servers
To partition a complex system into layers of abstraction
What is the primary technique used for securing communication channels in distributed systems?
Reflection pattern
Authentication
Cryptography
Shared secrets
What is the main threat to processes in distributed systems related to message sources?
Lack of reliable knowledge of the source of a message
Arbitrary failures of processes
Omission failures of processes
Timing failures of processes
Which type of failure in distributed systems occurs when a process halts and remains halted?
Timing failure
Crash failure
Omission failure
Arbitrary failure
What is the main purpose of fundamental models in distributed systems?
To provide a convenient programming model
To make explicit all relevant assumptions about the systems being modeled
To secure the processes and communication channels
To organize functionality in a given layer
What is the key characteristic of synchronous distributed systems?
Processes rely on asynchronous communication
Processes have known lower and upper bounds on execution time
Processes make arbitrary decisions
Processes have no bounds on execution time
Which type of failure in distributed systems occurs when a message inserted in an outgoing message buffer never arrives at the receiver's incoming message buffer?
Crash failure
Omission failure
Timing failure
Arbitrary failure
What is the primary technique used for securing channels in distributed systems based on authentication and encryption?
Shared secrets
Cryptography
Authentication
Reflection pattern
What is the significance of reflection pattern in securing communication channels in distributed systems?
To provide a convenient programming model
To authenticate the communication
To encrypt the communication
To manage the middleware solutions
How do fundamental models contribute to the security of distributed systems?
By defining the physical infrastructure
By organizing functionality in a given layer
By making explicit all relevant assumptions
By providing a convenient programming model
What role do architectural models play in ensuring the scalability of distributed systems?
To define the physical infrastructure of the system
To lay a foundation for understanding different architectural models
To provide security to the distributed system
To manage the middleware solutions
What is the primary purpose of architectural models in distributed systems?
To define the physical infrastructure of the system
To lay a foundation for understanding different architectural models
To provide security to the distributed system
To manage the middleware solutions
What is the key characteristic of asynchronous distributed systems?
Processes rely on synchronous communication
Processes have known lower and upper bounds on execution time
Processes make arbitrary decisions
Processes have no bounds on execution time
How do architectural models contribute to the scalability of distributed systems?
By defining the physical infrastructure of the system
By organizing functionality in a given layer and placing it onto appropriate servers
By providing security to the distributed system
By managing the middleware solutions
What is the primary characteristic of a synchronous distributed system?
Processes rely on asynchronous communication
Processes have known lower and upper bounds on execution time
Processes make arbitrary decisions
Processes have no bounds on execution time
What is the main concern related to message sources in distributed systems?
Lack of reliable knowledge of the source of a message
Arbitrary failures of processes
Omission failures of processes
Timing failures of processes
What is the key feature of asynchronous distributed systems?
Processes rely on synchronous communication
Processes have known lower and upper bounds on execution time
Processes make arbitrary decisions
Processes have no bounds on execution time
What is the primary characteristic of an asynchronous distributed system?
Processes rely on synchronous communication
Processes have known lower and upper bounds on execution time
Processes make arbitrary decisions
Processes have no bounds on execution time
How do architectural models contribute to the fault tolerance of distributed systems?
By defining the physical infrastructure of the system
By organizing functionality in a given layer and placing it onto appropriate servers
By providing security to the distributed system
By managing the middleware solutions
What is the primary purpose of middleware solutions in distributed systems?
To define the physical infrastructure of the system
To lay a foundation for understanding different architectural models
To provide security to the distributed system
To manage communication between different components
What is the primary purpose of the Brokerage pattern in distributed systems?
To provide a convenient programming model to application programmers
To organize functionality in a given layer and place it onto appropriate servers
To enable processes to play similar roles and interact cooperatively as peers
To partition a complex system into layers of abstraction
What is the key characteristic of physical models in distributed systems?
Middleware solutions and architectural patterns
Computational elements and communication tasks
Hardware composition and interconnecting networks
Abstract perspective of a distributed system
How do architectural models contribute to the reliability of distributed systems?
By defining the physical infrastructure of the system
By organizing functionality in a given layer and placing it onto appropriate servers
By providing security to the distributed system
By managing the middleware solutions
