Que- How is are collisions avoided in network ?
a. Carrier sense with multiple access (CSMA); collision detection (CD)
b. Carrier sense multiple access with collision avoidance
c. Message slots
d. All of the mentioned
Answer- All of the mentioned
Que- What is common problem found in distributed system ?
a. Process Synchronization
b. Communication synchronization
c. Deadlock problem
d. Power failure
Answer- Deadlock problem
Que- How many layers does Internet model ISO consists of ?
a. Three
b. Five
c. Seven
d. Eight
Answer- Seven
Que- Which layer is responsible for The process-to-process delivery ?
a. Network
b. Transport
c. Application
d. Physical
Answer- Transport
Que- Which layer is the layer closest to the transmission medium ?
a. Physical
b. Data link
c. Network
d. Transport
Answer- Physical
Que- Header are ______ when data packet moves from upper to the lower layers ?
a. Modified
b. Removed
c. Added
d. All of the mentioned
Answer- Added
Que- Which layer lies between transport layer and data link layer ?
a. Physical
b. Network
c. Application
d. Session
Answer- Network
Que- Which of the following is an application layer service ?
a. Mail service
b. File transfer
c. Remote access
d. All of the mentioned
Answer- All of the mentioned
Que- What are different ways distributed may suffer ?
a. Failure of a link
b. Failure of a site
c. Loss of message
d. All of the mentioned
Answer- All of the mentioned
Que- What are design issues in distributed system structure ?
a. Scalability
b. Fault-tolerance
c. Clustering
d. All of the mentioned
Answer- All of the mentioned
Que- In which OSI layer encryption and decryption happens ?
a. Application
b. Presentation
c. Transport
d. Data Link
Answer- Presentation
Que- What are important step followed when recovery from failure happens ?
a. Post repairing integration with main system should happen smoothly and gracefully
b. Upon link failure both parties at end must not be notified
c. Fault recovery system must me adjusted
d. Failures are logged systematically
Answer- Post repairing integration with main system should happen smoothly and gracefully
Que- What are the different ways in which clients and servers are dispersed across machines ?
a. Servers may not run on dedicated machines
b. Servers and clients can be on same machines
c. Distribution cannot be interposed between a OS and the file system
d. OS cannot be distributed with the file system a part of that distribution
Answer- Servers and clients can be on same machines
Que- What are not the characteristics of a DFS ?
a. login transparency and access transparency
b. Files need not contain information about their physical location
c. No Multiplicity of users
d. No Multiplicity if files
Answer- No Multiplicity of users
Que- What are characteristic of a DFS ?
a. Fault tolerance
b. Scalability
c. Heterogeneity of the system
d. Upgradation
Answer- Upgradation
Que- What are the different ways file accesses take place ?
a. sequential access
b. direct access
c. indexed sequential access
d. all of the mentioned
Answer- all of the mentioned
Que- Which is not a major components of file system ?
a. Directory service
b. Authorization service
c. Shadow service
d. System service
Answer- Shadow service
Que- What are the different ways mounting of file system ?
a. boot mounting
b. auto mounting
c. explicit mounting
d. all of the mentioned
Answer- all of the mentioned
Que- What is the advantage of caching in remote file access ?
a. Reduced network traffic by retaining recently accessed disk blocks
b. Faster network access
c. Copies of data creates backup automatically
d. None of the mentioned
Answer- Reduced network traffic by retaining recently accessed disk blocks
Que- What is networked virtual memory ?
a. Caching
b. Segmentation
c. RAM disk
d. None of the mentioned
Answer- Caching
Que- What are examples of state information ?
a. opened files and their clients
b. file descriptors and file handles
c. current file position pointers
d. all of the mentioned
Answer- all of the mentioned
Que- Which is not an examples of state information ?
a. Mounting information
b. Description of HDD space
c. Session keys
d. Lock status
Answer- Description of HDD space
Que- What is a stateless file server ?
a. It keeps tracks of states of different objects
b. It maintains internally no state information at all
c. It maintains some information in them
d. None of the mentioned
Answer- It maintains internally no state information at all
Que- What are the characteristics of stateless server ?
a. Easier to implement
b. They are not fault-tolerant upon client or server failures
c. They store all information file server
d. They are redundant to keep data safe
Answer- Easier to implement
Que- Implementation of a stateless file server must not follow ?
a. Idempotency requirement
b. Encryption of keys
c. File locking mechanism
d. Cache consistency
Answer- Encryption of keys
Que- What are the advantages of file replication ?
a. Improves availability & performance
b. Decreases performance
c. They are consistent
d. Improves speed
Answer- Improves availability & performance
Que- What are characteristic of NFS protocol ?
a. Search for file within directory
b. Read a set of directory entries
c. Manipulate links and directories
d. All of the mentioned
Answer- All of the mentioned
Que- What is coherency of replicated data ?
a. All replicas are identical at all times
b. Replicas are perceived as identical only at some points in time
c. Users always read the most recent data in the replicas
d. All of the mentioned
Answer- All of the mentioned
Que- What are the three popular semantic modes ?
a. Unix, Coherent & Session semantics
b. Unix, Transaction & Session semantics
c. Coherent, Transaction & Session semantics
d. Session, Coherent semantics
Answer- Unix, Transaction & Session semantics
Que- What are the characteristics of Unix semantics ?
a. Easy to implement in a single processor system
b. Data cached on a per process basis using write through case control
c. Write-back enhances access performance
d. All of the mentioned
Answer- All of the mentioned
Que- What are the characteristics of transaction semantics ?
a. Suitable for applications that are concerned about coherence of data
b. The users of this model are interested in the atomicity property for their transaction
c. Easy to implement in a single processor system
d. Write-back enhances access performance
Answer- The users of this model are interested in the atomicity property for their transaction
Que- What are non characteristics of session semantics ?
a. Each client obtains a working copy from the server
b. When file is closed, the modified file is copied to the file server
c. The burden of coordinating file sharing is ignored by the system
d. Easy to implement in a single processor system
Answer- Easy to implement in a single processor system
Que- The file once created can not be changed is called
a. immutable file
b. mutex file
c. mutable file
d. none of the mentioned
Answer- immutable file
Que- ______ of the distributed file system are dispersed among various machines of distributed system.
a. Clients
b. Servers
c. Storage devices
d. All of the mentioned
Answer- All of the mentioned
Que- _______ is not possible in distributed file system.
a. File replication
b. Migration
c. Client interface
d. Remote access
Answer- Migration
Que- Which one of the following hides the location where in the network the file is stored?
a. transparent distributed file system
b. hidden distributed file system
c. escaped distribution file system
d. spy distributed file system
Answer- transparent distributed file system
Que- In distributed file system, when a file's physical storage location changes
a. file name need to be changed
b. file name need not to be changed
c. file's host name need to be changed
d. file's local name need to be changed
Answer- file name need not to be changed
Que- In distributed file system, _______ is mapping between logical and physical objects.
a. client interfacing
b. naming
c. migration
d. heterogeneity
Answer- naming
Que- In distributed file system, a file is uniquely identified by
a. host name
b. local name
c. the combination of host name and local name
d. none of the mentioned
Answer- the combination of host name and local name
Que- There is no need to establish and terminate a connection through open and close operation in
a. stateless file service
b. stateful file service
c. both stateless and stateful file service
d. none of the mentioned
Answer- stateless file service
Que- In distributed file system, file name does not reveal the file's
a. local name
b. physical storage location
c. both local name and physical storage location
d. none of the mentioned
Answer- physical storage location
Que- Which one of the following is a distributed file system?
a. andrew file system
b. network file system
c. novel network
d. all of the mentioned
Answer- all of the mentioned
Que- What are the characteristics of tightly coupled system ?i) Different clockii) Use communication linksiii) Same clockiv) Distributed systems
a. i
b. i and iv
c. i, ii and iii
d. ii, iii and iv
Answer- ii, iii and iv
Que- What are the characteristics of mutual exclusion using centralized approach ?
a. One processor as coordinator which handles all requests
b. It requires request,reply and release per critical section entry
c. The method is free from starvation
d. All of the mentioned
Answer- All of the mentioned
Que- What are the advantages of token (with rings) passing approach ? (i) One processor as coordinator which handles all requests (ii) No starvation if the ring is unidirectional (iii) There are many messages passed per section entered if few users want to get in section (iv) One processor as coordinator which handles all requests (v) Only one message/entry if everyone wants to get in
a. i
b. ii and iii
c. i, ii and iii
d. i, ii and iv
Answer- i, ii and iv
Que- What is the characteristics of atomicity ?
a. All operations associated are executed to completion or none are performed
b. One processor as coordinator which handles all requests
c. When responses are received from all processes, then process can enter its Critical Section
d. Use communication links
Answer- All operations associated are executed to completion or none are performed
Que- What things are transaction coordinator is responsible for ?
a. Starting the execution of the transaction
b. Breaking transaction into a number of subtransactions
c. Coordinating the termination of the transaction
d. All of the mentioned
Answer- All of the mentioned
Que- Single coordinator approach has the following advantages :
a. Simple implementation
b. Simple deadlock handling
c. bottleneck
d. All of the mentioned
Answer- All of the mentioned
Que- Single coordinator approach has the following disadvantages :
a. Bottleneck
b. Slow response
c. Deadlock
d. One request per second
Answer- Bottleneck
Que- What are the disadvantages of majority protocol ?
a. Complicated implementation
b. Deadlock cannot occur easily
c. Bottleneck
d. All of the mentioned
Answer- Complicated implementation
Que- What are the parts of global unique identifier ?
a. Local unique timestamp
b. Remote timestamp
c. Clock number
d. All of the mentioned
Answer- Local unique timestamp
Que- Which are the two complementary deadlock-prevention schemes using timestamps ?
a. The wait-die & wound-wait scheme
b. The wait-n-watch scheme
c. The wound-wait scheme
d. The wait-wound & wound-wait scheme
Answer- The wait-die & wound-wait scheme
Que- In distributed systems, a logical clock is associated with
a. each instruction
b. each process
c. each register
d. none of the mentioned
Answer- each process
Que- If timestamps of two events are same, then the events are
a. concurrent
b. non-concurrent
c. monotonic
d. non-monotonic
Answer- concurrent
Que- If a process is executing in its critical section
a. any other process can also execute in its critical section
b. no other process can execute in its critical section
c. one more process can execute in its critical section
d. none of the mentioned
Answer- no other process can execute in its critical section
Que- A process can enter into its critical section
a. anytime
b. when it receives a reply message from its parent process
c. when it receives a reply message from all other processes in the system
d. none of the mentioned
Answer- when it receives a reply message from all other processes in the system
Que- For proper synchronization in distributed systems
a. prevention from the deadlock is must
b. prevention from the starvation is must
c. prevention from the deadlock & starvation is must
d. none of the mentioned
Answer- prevention from the deadlock & starvation is must
Que- In the token passing approach of distributed systems, processes are organized in a ring structure
a. logically
b. physically
c. both logically and physically
d. none of the mentioned
Answer- logically
Que- In distributed systems, transaction coordinator
a. starts the execution of transaction
b. breaks the transaction into number of sub transactions
c. coordinates the termination of the transaction
d. all of the mentioned
Answer- all of the mentioned