OS Final

Question 1 of 100

1

1. TCP/IP stands for

Select one of the following:

o TCP/IP (Transmission Control Protocol/Internet Protocol)
o TCP/IP (Transfer Control Protocol/Internet Protocol
o TCP/IP (Transmission Control Protocol/Individual Protocol)
o TCP/IP (Transcript Control Protocol/Internet Protocol)

Explanation

Question 2 of 100

1

2. When was TCP/IP developed?

Select one of the following:

o 1978
o 1977
o 1976
o 1975

Explanation

Question 3 of 100

1

3. With whom TCP/IP was driven

Select one of the following:

o Kahn and Cerf
o Ronald and Cerf
o Cerf and George
o McColin and Kahn

Explanation

Question 4 of 100

1

4. TCP is higher layer

Select one of the following:

True
False

Explanation

Question 5 of 100

1

5. What is the function of a subnet mask

Select one of the following:

o to determine whether an IP address exists on the local network or whether it must be routed outside the local network.
o process that applies binary logic to yield binary results
o It sends out ICMP (Internet Control Message Protocol) messages to verify both the logical addresses & the Physical connection.
o to determine whether an IP address exists on the global network or whether it must be routed outside the global network.

Explanation

Question 6 of 100

1

6. Which of the following is false about Subnet Mask?

Select one of the following:

o The function of a subnet mask is to determine whether an IP address exists on the local network or whether it must be routed outside the local network.
o It is applied to a message’s destination address to extract the network address.
o If the extracted network address matches the local network ID, the destination is located on the local network.
o It sends out ICMP (Internet Control Message Protocol) messages to verify both the logical addresses & the Physical connection

Explanation

Question 7 of 100

1

7. Define a boolean algebra

Select one of the following:

o process that applies binary logic to yield binary results
o to determine whether an IP address exists on the local network or whether it must be routed outside the local network.
o It sends out ICMP (Internet Control Message Protocol) messages to verify both the logical addresses & the Physical connection.
o to determine whether an IP address exists on the global network or whether it must be routed outside the global network.

Explanation

Question 8 of 100

1

8. Define class A

Select one of the following:

o large organizations, governments
o medium sized organizations
o small organizations
o extra small organisations

Explanation

Question 9 of 100

1

9. Define class B

Select one of the following:

o large organizations, governments
o medium sized organizations
o small organizations
o extra small organisations

Explanation

Question 10 of 100

1

10. Define class C

Select one of the following:

o large organizations, governments
o medium sized organizations
o small organizations
o extra small organisation

Explanation

Question 11 of 100

1

11. In Class A an IP address starts with

Select one of the following:

o 0
o 10
o 110
o 1010

Explanation

Question 12 of 100

1

12. In Class C the network prefix is

Select one of the following:

o 24 bits long
o 16 bits long
o 8 bits long
o 32 bits long

Explanation

Question 13 of 100

1

13. Into how many classes divided the address space in classful addressing ?

Select one of the following:

5
4
3
2

Explanation

Question 14 of 100

1

14. How many layers have ISO/OSI Network Model

Select one of the following:

7
6
8
5

Explanation

Question 15 of 100

1

15. What is a link layer

Select one of the following:

o Includes device driver and network interface card
o Handles the movement of packets
o Provides a reliable flow of data between two hosts
o Handles the details of the particular application

Explanation

Question 16 of 100

1

16. What is a network layer

Select one of the following:

o Includes device driver and network interface card
o Handles the movement of packets
o Provides a reliable flow of data between two hosts
o Handles the details of the particular application

Explanation

Question 17 of 100

1

17. What is a transport layer

Select one of the following:

o Includes device driver and network interface card
o Handles the movement of packets
o Provides a reliable flow of data between two hosts
o Handles the details of the particular application

Explanation

Question 18 of 100

1

18. What is an application layer

Select one of the following:

o Includes device driver and network interface card
o Handles the movement of packets
o Provides a reliable flow of data between two hosts
o Handles the details of the particular application

Explanation

Question 19 of 100

1

19. In Class B an IP address starts with

Select one of the following:

o 0
o 10
o 110
o 1010

Explanation

Question 20 of 100

1

20. In Class C an IP address starts with

Select one of the following:

o 0
o 10
o 110
o 1010

Explanation

Question 21 of 100

1

21. In Class A the network prefix is

Select one of the following:

o 24 bits long
o 16 bits long
o 8 bits long
o 32 bits long

Explanation

Question 22 of 100

1

22. In Class B the network prefix is

Select one of the following:

o 24 bits long
o 16 bits long
o 8 bits long
o 32 bits long

Explanation

Question 23 of 100

1

23. PING stands for

Select one of the following:

o Packet Internet Groper
o Pocket Internet Groper
o Ping Internet Groper
o Packet Internet Gathering

Explanation

Question 24 of 100

1

24. ICMP stands for

Select one of the following:

o Internet Control Message Protocol
o Internet Control Machine Protocol
o Internet Clarify Message Protocol
o Internet Control Management Protocol

Explanation

Question 25 of 100

1

25. Define PING

Select one of the following:

o command verifies OSI Layer 3
o verifies both the logical addresses & the Physical connection
o process that applies binary logic to yield binary results
o verifies the Physical connection

Explanation

Question 26 of 100

1

26. Virtual memory provides

Select one of the following:

o Automatic storage allocation
o Protection
o Sharibility
o All the above

Explanation

Question 27 of 100

1

27. Where Virtual Machine was developed?

Select one of the following:

o Lancaster University
o Manchester University
o MIT
o Cambridge

Explanation

Question 28 of 100

1

28. What is the first commercial computer with virtual machine

Select one of the following:

o B5000
o B5550
o B5500
o C5000

Explanation

Question 29 of 100

1

29. When was the first commercial computer with virtual machine released?

Select one of the following:

o 1961
o 1962
o 1963
o 1964

Explanation

Question 30 of 100

1

30. Which of the following is false about VM and performance?

Select one of the following:

o Better performance: we can use more memory than we have
o Nothing; mapping to memory or disk is just as easy
o Worse performance: reading from disk is slower than RAM
o Good performance: reading from disk is slower than RAM

Explanation

Question 31 of 100

1

31. Which of the following is false about usability of Virtual Memory?

Select one of the following:

o Not enough memory
o Holes in the address space
o Keeping program secure
o Keeping program insecure

Explanation

Question 32 of 100

1

32. Define virtual address space

Select one of the following:

o process refers to the logical (or virtual) view of how a process is stored in memory
o used to translate the virtual addresses seen by the application into physical addresses
o a segment of virtual memory that has been assigned a direct byte-for-byte correlation with some portion of a file or file-like resource.
o none of the mentioned

Explanation

Question 33 of 100

1

33. Define a page tables

Select one of the following:

o process refers to the logical (or virtual) view of how a process is stored in memory
o used to translate the virtual addresses seen by the application into physical addresses
o a segment of virtual memory that has been assigned a direct byte-for-byte correlation with some portion of a file or file-like resource.
o none of the mentioned

Explanation

Question 34 of 100

1

34. Which of the following is incorrect about Subnet Mask

Select one of the following:

o The function of a subnet mask is to determine whether an IP address exists on the local network or whether it must be routed outside the local network.
o It is applied to a message’s destination address to extract the network address.
o to determine whether an IP address exists on the global network or whether it must be routed outside the global network.
o If the extracted network address matches the local network ID, the destination is located on the local network.

Explanation

Question 35 of 100

1

35. What is a port number for SSH

Select one of the following:

o TCP 22
o TCP 33
o TCP 25
o TCP 443

Explanation

Question 36 of 100

1

36. POP stands for

Select one of the following:

o Post Office Protocol
o Postal Office Protocol
o Pop Office Protocol
o Prefix Office Protocol

Explanation

Question 37 of 100

1

37. Common port number for web pages

Select one of the following:

o 80
o 23
o 25
o 110

Explanation

Question 38 of 100

1

38. Common port number for telnet

Select one of the following:

o 80
o 23
o 25
o 110

Explanation

Question 39 of 100

1

39. Common port number for mail

Select one of the following:

o 80
o 23
o 25 and 110
o 111

Explanation

Question 40 of 100

1

40. How many classes have a subnet mask

Select one of the following:

1
2
3
4

Explanation

Question 41 of 100

1

41. At the FILE SYSTEM SECURITY what is an Access right?

Select one of the following:

o The way in which an object is accessed by a subject
o Anything to which access is controlled
o An entity capable of accessing objects
o None of them

Explanation

Question 42 of 100

1

42. At Linux Virtual File System Concept, The four primary object types in VFS are as follows:

Select one of the following:

o Superblock object, inode object, dentry object, file object
o System object, software object, hardware object, network object
o Virtual object, physical object, i/o object, calling object
o File system object, user object, disk object, mapping object

Explanation

Question 43 of 100

1

43. What is an EMBEDDED SYSTEMS?

Select one of the following:

o combination of computer hardware and software, and perhaps additional mechanical or other part, designed to perform a dedicated function
o A file consists of a collection of records
o The cache manager calls the log file system to prompt it to flush the log file to disk.
o Once the log file updates are safely on disk, the cache manager flushes the volume changes to disk

Explanation

Question 44 of 100

1

44. CHARACTERISTICS OF EMBEDDED OPERATING SYSTEMS, Give definition to Real-time operation:

Select one of the following:

o In many embedded systems, the correctness of a computation depends, in part, on the time at which it is delivered
o Embedded software may execute in response to external events
o Condtional compilation can be used
o There is virtually no device that needs to be supported by all versions of the OS, and the range of I/O devices is large

Explanation

Question 45 of 100

1

45. Give the correct way to “Loading an eCos Configuration”:

Select one of the following:

o GNU make utility>>Application source code>>GNU cross compiler>>GNU linker>>Executable file
o Application source code>>GNU linker>>GNU cross compiler>>GNU make utility>>Executable file
o GNU linker>>Application source code>>GNU make utility>>GNU cross compiler>>Executable file
o GNU cross compiler>>GNU linker>>GNU make utility>>Application source code>>Executable file

Explanation

Question 46 of 100

1

46. Choose the correct choice of the “eCos Layered Structure” from bottom- to- top?

Select one of the following:

o Hardware abstraction layer, Kernel, I/O system, Standard C library, User application code
o Kernel, I/O system, Standard C library, User application code, Hardware abstraction layer
o User application code, Standard C library, I/O system, Kernel, Hardware abstraction layer
o I/O system, Kernel, Hardware abstraction layer, Standard C library, User application code.

Explanation

Question 47 of 100

1

47. How many implemented separate modules has The HAL?

Select one of the following:

3
4
5
6

Explanation

Question 48 of 100

1

48. How many main objectives has The eCos Kernel was designed to satisfy?

Select one of the following:

4
5
6
7

Explanation

Question 49 of 100

1

49. What does “TINYOS” mean?

Select one of the following:

o Represents a significant departure from other embedded operating systems
o is a flag that a thread can check before executing a particular piece of code.
o A different distributes of Linux.
o A different versions of Windows.

Explanation

Question 50 of 100

1

50. Three abstractions for resources are used in TinyOS:

Select one of the following:

o Dedicated, Virtualized, Shared
o Abstracted, Powered, Protected
o Determined, Called, Multiplexed
o Needed, Controlled, Used

Explanation

Question 51 of 100

1

51. What is a Computer Security?

Select one of the following:

o The protection afforded to an automated information system in order to attain the applicable objectives of preserving the integrity, availability and confidentiality of information resources
o Comparing the information systems with computer systems
o Updating hardware and software
o Creating the local and global networks for computer systems

Explanation

Question 52 of 100

1

52. This definition introduces three key objectives that are at the heart of computer security:

Select one of the following:

o Confidentiality, Integrity, Availability
o Protection, Updating, Creating
o Attacking, Copying, Pasting
o Dividing, Working, Researching

Explanation

Question 53 of 100

1

53. Although the use of the CIA triad to define security objects is well established, some in the security field feel that additional concepts are needed to present a complete picture. Two of the most commonly mentioned are as follows:

Select one of the following:

o Authenticity, Accountability
o Loggin, Entering
o Accessibility, Availability
o Realibility, Security

Explanation

Question 54 of 100

1

54. Network security attacks can be classified as:

Select one of the following:

o Passive and active attacks
o Dangerous and undangerous
o Correct and incorrect
o Direct and indirect.

Explanation

Question 55 of 100

1

55. In an important early study of intrusion, Anderson[ANDE80] identified three classes of intruders:

Select one of the following:

o Masquerader, misfeasor, clandestine user
o Individual, legitimate, authorized
o Control, exploit, system
o Outside, inside, offside.

Explanation

Question 56 of 100

1

56. How many parts of Memory Hierarchy?

Select one of the following:

5
4
3
2

Explanation

Question 57 of 100

1

57. In Memory Hierarchy, at the Outboard storage which of the following are included:

Select one of the following:

o Cache
o Main memory
o Magnetic tape
o Magnetic disk

Explanation

Question 58 of 100

1

58. In Memory Hierarchy, at the Off-line storage which of the following are included:

Select one of the following:

o Cache
o Magnetic disk
o Magnetic tape
o Main memory

Explanation

Question 59 of 100

1

59. In Memory Hierarchy, at the Inboard memory which of the following are included:

Select one of the following:

o Main memory
o Magnetic disk
o Magnetic tape
o Optical disk

Explanation

Question 60 of 100

1

60. Cache Design has these properties?

Select one of the following:

o Size, block size, mapping function, replacement algorithm, write policy
o Size, search function, write function, read policy, vector algorithm
o Size, mapping algorithm, vector function, write policy, replacement function
o Size, blocking algorithm, search function, replacement vector, read policy

Explanation

Question 61 of 100

1

61. Three techniques are possible for I/O operations:

Select one of the following:

o Programmed I/O, Interrupt-driven I/O, Direct memory access(DMA)
o Object-oriented I/O, Design I/O, Usable I/O
o Machine I/O, Architecture I/O, Hardware I/O
o Control I/O, Status I/O, Transfer I/O

Explanation

Question 62 of 100

1

62. How many principles has Deadlock?:

Select one of the following:

o 3
o 5
o 2
o 6

Explanation

Question 63 of 100

1

63. Which of the following principles has Deadlock?

Select one of the following:

o Prevention, Avoidance, Detection
o Execution, Association, Starvation
o Exclusion, Avoidance, Starvation
o Starvation, Detection, Exclusion

Explanation

Question 64 of 100

1

64. Much of the work in security and protection as it relates to operating systems can be roughly grouped into four categories?

Select one of the following:

o Availability, confidentiality, data integrity, authenticity
o Safety, accountability, reliability, density
o Usability, integrity, confidentiality, reliability
o Flexibility, availability, accountability, authenticity

Explanation

Question 65 of 100

1

65. The central themes of operating system design are all concerned with the management of processes and threads?

Select one of the following:

o Multiprogramming, multiprocessing, distributed processing
o Multitasking, multiprogramming, multithreading
o Multiprocessing, uniprocessing, multitasking
o Multithreading, distributed processing, uniprocessing

Explanation

Question 66 of 100

1

66. Which one of the following linux file system does not support journaling feture?

Select one of the following:

o ext2
o ext3
o ext4
o none of the mentioned

Explanation

Question 67 of 100

1

67. With the installation of Linux, a super user account is created called as _____

Select one of the following:

o Superuser
o User
o Administrator
o Root

Explanation

Question 68 of 100

1

68. Which command would you use if you want to remove the password assigned to a group?

Select one of the following:

o gpasswd – r
o gpasswd – d
o userdel
o delgroup

Explanation

Question 69 of 100

1

69. What command is used to remove files?

Select one of the following:

o Dm
o Rm
o Del
o Erase
o Wc

Explanation

Question 70 of 100

1

70. What command is used to remove the directory?

Select one of the following:

o Remove
o Rdir
o Mdir
o Delete
o Rmdir

Explanation

Question 71 of 100

1

71. Convert this number systems: BIN(1111000111) to DEC?

Select one of the following:

o 967
o 912
o 868
o 898

Explanation

Question 72 of 100

1

72. Convert this number systems: BIN(10101010101) to DEC?:

Select one of the following:

o 1365
o 1432
o 1295
o 1523

Explanation

Question 73 of 100

1

73. Convert this number systems: BIN(1100001100) to DEC?:

Select one of the following:

o 780
o 795
o 824
o 912

Explanation

Question 74 of 100

1

74. Convert this number systems: BIN(1111000111) to DEC?

Select one of the following:

o 967
o 912
o 868
o 898

Explanation

Question 75 of 100

1

75. Which of the following is not one of the principles of dealing with deadlock?

Select one of the following:

o Initialization
o Prevention
o Avoidance
o Detection

Explanation

Question 76 of 100

1

76. Current allocation of resources to processes where there is at least one sequence that does not result in deadlock is called:

Select one of the following:

o Safe state
o Unsafe state
o Ambiguous state
o Alternative state

Explanation

Question 77 of 100

1

77. Current allocation of resources to processes where there is no sequence that does not result in deadlock is called:

Select one of the following:

o Unsafe state
o Safe state
o Ambiguous state
o Alternative state

Explanation

Question 78 of 100

1

78. Can you solve the Dining Philosophers’ Problem using monitors?

Select one of the following:

o Yes
o No
o Yes, but only if there are less than five philosophers
o No, unless there are more than five philosophers

Explanation

Question 79 of 100

1

79. A fixed-length block of main memory is called:

Select one of the following:

o Frame
o Page
o Segment
o Section

Explanation

Question 80 of 100

1

80. A fixed-length block of data in secondary memory is called:

Select one of the following:

o Frame
o Page
o Segment
o Section

Explanation

Question 81 of 100

1

81. A variable-length block of data that resides in secondary memory is called:

Select one of the following:

o Frame
o Page
o Segment
o Section

Explanation

Question 82 of 100

1

82. When free memory is split into many unconnected pieces we call it:

Select one of the following:

o Internal fragmentation
o External fragmentation
o Compaction
o Memory distribution

Explanation

Question 83 of 100

1

83. Memory partitioning algorithm that uses binary tree as a data structure is called:

Select one of the following:

o First-fit algorithm
o Next-fit algorithm
o Buddy system
o Best-fit algorithm

Explanation

Question 84 of 100

1

84. A state in which the system spends most of its time swapping pieces rather than executing instructions is called:

Select one of the following:

o Virtual memory
o Thrashing
o Swapping
o Spanning

Explanation

Question 85 of 100

1

85. What command do you use to create Linux file systems?

Select one of the following:

o Fdisk
o Mkfs
o Fsck
o Mount

Explanation

Question 86 of 100

1

86. What command is not used to list the files chap01, chap02 and chap04?

Select one of the following:

o ls chap*
o ls chap[124]
o ls - x chap0[124]
o ls chap0[124]

Explanation

Question 87 of 100

1

87. What is operating system?

Select one of the following:

o collection of programs that manages hardware resources
o system service provider to the application programs
o link to interface the hardware and application programs
o all of the mentioned

Explanation

Question 88 of 100

1

88. The main function of the command interpreter is

Select one of the following:

o to get and execute the next user-specified command
o to provide the interface between the API and application program
o to handle the files in operating system
o none of the mentioned

Explanation

Question 89 of 100

1

89. To create a file

Select one of the following:

o allocate the space in file system
o make an entry for new file in directory
o both (a) and (b)
o none of the mentioned

Explanation

Question 90 of 100

1

90. What is a Server?

Select one of the following:

o is a computer program running to serve the requests of other programs, the "clients".
o Simple computer
o Optical device
o Types of laptops

Explanation

Question 91 of 100

1

91. Show incorrect choice, when we mean types of Server:

Select one of the following:

o Cooking server
o Database server
o Client server
o Application server

Explanation

Question 92 of 100

1

92. What is a Create file?

Select one of the following:

o When a new file is created, an entry must be added to the directory
o When a user or application references a file, the directory must be searched to find the entry corresponding to that file..
o When a file is deleted, an entry must be removed from the directory.
o All or a portion of the directory may be requested.

Explanation

Question 93 of 100

1

93. What is a Delete file?

Select one of the following:

o When a file is deleted, an entry must be removed from the directory
o When a user or application references a file, the directory must be searched to find the entry corresponding to that file..
o When a new file is created, an entry must be added to the directory.
o All or a portion of the directory may be requested.

Explanation

Question 94 of 100

1

94. Given the IP address 172.16.12.54 with a mask of 255.255.255.240, which of the following are valid host addresses on the different subnet?

Select one of the following:

o 172.16.12.64
o 172.16.12.57
o 172.16.12.49
o 172.16.12.48
o 172.16.12.63
o 172.16.12.45

Explanation

Question 95 of 100

1

95. You need to subnet a network that has 5 subnets, each with at least 16 hosts. Which classful subnet mask would you use?

Select one of the following:

o 255.255.255.192
o 255.255.255.224
o 255.255.255.240
o 255.255.255.248

Explanation

Question 96 of 100

1

96. Given the IP address 172.16.12.54 with a mask of 255.255.255.240, which of the following are valid broadcast addresses?

Select one of the following:

o 172.16.12.64
o 172.16.12.57
o 172.16.12.49
o 172.16.12.48
o 172.16.12.63
o 172.16.12.45

Explanation

Question 97 of 100

1

97. File type can be represented by

Select one of the following:

o file name
o file extension
o file identifier
o none of the mentioned

Explanation

Question 98 of 100

1

98. What does GNU stand for?

Select one of the following:

o GNU's not Unix
o Greek Needed Unix
o General Unix
o General Noble Unix
o None of the above

Explanation

Question 99 of 100

1

	Created by Hello World over 7 years ago

IITU

Question 1 of 100

1. TCP/IP stands for

Select one of the following:

Explanation

Question 2 of 100

2. When was TCP/IP developed?

Select one of the following:

Explanation

Question 3 of 100

3. With whom TCP/IP was driven

Select one of the following:

Explanation

Question 4 of 100

4. TCP is higher layer

Select one of the following:

Explanation

Question 5 of 100

5. What is the function of a subnet mask

Select one of the following:

Explanation

Question 6 of 100

6. Which of the following is false about Subnet Mask?

Select one of the following:

Explanation

Question 7 of 100

7. Define a boolean algebra

Select one of the following:

Explanation

Question 8 of 100

8. Define class A

Select one of the following:

Explanation

Question 9 of 100

9. Define class B

Select one of the following:

Explanation

Question 10 of 100

10. Define class C

Select one of the following:

Explanation

Question 11 of 100

11. In Class A an IP address starts with

Select one of the following:

Explanation

Question 12 of 100

12. In Class C the network prefix is

Select one of the following:

Explanation

Question 13 of 100

13. Into how many classes divided the address space in classful addressing ?

Select one of the following:

Explanation

Question 14 of 100

14. How many layers have ISO/OSI Network Model

Select one of the following:

Explanation

Question 15 of 100

15. What is a link layer

Select one of the following:

Explanation

Question 16 of 100

16. What is a network layer

Select one of the following:

Explanation

Question 17 of 100

17. What is a transport layer

Select one of the following:

Explanation

Question 18 of 100

18. What is an application layer

Select one of the following:

Explanation

Question 19 of 100

19. In Class B an IP address starts with

Select one of the following:

Explanation

Question 20 of 100

20. In Class C an IP address starts with