Test
OS100
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Preguntas del test (99)
11. TCP/IP stands for
- ATCP/IP (Transmission Control Protocol/Internet Protocol)
- BTCP/IP (Transfer Control Protocol/Internet Protocol
- CTCP/IP (Transmission Control Protocol/Individual Protocol
- DTCP/IP (Transcript Control Protocol/Internet Protocol)
2When was TCP/IP developed
- A1978
- B1977
- C1976
- D1975
3With whom TCP/IP was driven
- AKahn and Cerf
- BRonald and Cerf
- CCerf and George
- DMcColin and Kahn
4TCP is higher layer
- ATrue
- BFalse
5What is the function of a subnet mask
- Ato determine whether an IP address exists on the local network or whether it must be routed outside the local network.
- Bprocess that applies binary logic to yield binary results
- CIt sends out ICMP (Internet Control Message Protocol) messages to verify both the logical addresses & the Physical connection
- Dto determine whether an IP address exists on the global network or whether it must be routed outside the global network.
6Which of the following is false about Subnet Mask?
- AThe 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.
- BIt is applied to a message’s destination address to extract the network address
- CIf the extracted network address matches the local network ID, the destination is located on the local network.
- Dt sends out ICMP (Internet Control Message Protocol) messages to verify both the logical addresses & the Physical connection
7 Define a boolean algebra
- Aprocess that applies binary logic to yield binary results
- Bto determine whether an IP address exists on the local network or whether it must be routed outside the local network.
- CIt sends out ICMP (Internet Control Message Protocol) messages to verify both the logical addresses & the Physical connection.
- Dto determine whether an IP address exists on the global network or whether it must be routed outside the global network
8Define class A
- Alarge organizations, governments
- Bmedium sized organizations
- Csmall organizations
- Dextra small organisations
9Define class B
- Alarge organizations, governments
- Bmedium sized organizations
- Csmall organizations
- Dextra small organisations
10Define class C
- Alarge organizations, governments
- Bmedium sized organizations
- Csmall organizations
- Dextra small organisation
11In Class A an IP address starts with
- A0
- B10
- C110
- D1010
12In Class C the network prefix is
- A24 bits long
- B16 bits long
- C8 bits long
- D32 bits long
13Into how many classes divided the address space in classful addressing ?
- A5
- B4
- C3
- D2
14 How many layers have ISO/OSI Network Model
- A7
- B6
- C8
- D5
15What is a link layer
- AIncludes device driver and network interface card
- BHandles the movement of packets
- CProvides a reliable flow of data between two hosts
- DHandles the details of the particular applicatio
16What is a network layer
- AIncludes device driver and network interface card
- BHandles the movement of packets
- CProvides a reliable flow of data between two hosts
- DHandles the details of the particular application
17What is a transport layer
- AIncludes device driver and network interface card
- BHandles the movement of packet
- CProvides a reliable flow of data between two hosts
- DHandles the details of the particular application
18What is an application layer
- AIncludes device driver and network interface card
- BHandles the movement of packets
- CProvides a reliable flow of data between two hosts
- DHandles the details of the particular application
19In Class B an IP address starts with
- A0
- B10
- C110
- D1010
20In Class C an IP address starts with
- A0
- B10
- C110
- D1010
21 In Class A the network prefix is
- A24 bits long
- B16 bits long
- C8 bits long
- D32 bits long
22In Class B the network prefix is
- A24 bits long
- B16 bits long
- C8 bits long
- D32 bits long
23PING stands for
- APacket Internet Groper
- BPocket Internet Groper
- CPing Internet Groper
- DPacket Internet Gathering
24ICMP stands for
- AInternet Control Message Protocol
- BInternet Control Machine Protocol
- CInternet Clarify Message Protocol
- DInternet Control Message Protocol ()
25 Define PING
- Acommand verifies OSI Layer 3
- Bverifies both the logical addresses & the Physical connection
- Cprocess that applies binary logic to yield binary results
- Dverifies the Physical connection
26Virtual memory provides
- AAutomatic storage allocation
- BProtection
- CSharibility
- DAll the above
27Where Virtual Machine was developed?
- ALancaster University
- BManchester University
- CMIT
- DCambridge
28What is the first commercial computer with virtual machin
- AB5000
- BB5550
- CB5500
- DC5000
29 When was the first commercial computer with virtual machine released?
- A1961
- B1962
- C1963
- D1964
30 Which of the following is false about VM and performance?
- ABetter performance: we can use more memory than we have
- BNothing; mapping to memory or disk is just as easy
- CWorse performance: reading from disk is slower than RAM
- DGood performance: reading from disk is slower than RAM
31Which of the following is false about usability of Virtual Memory? o
- ANot enough memory
- BHoles in the address space
- CKeeping program secure
- DKeeping program insecure
32Define virtual address space
- Aprocess refers to the logical (or virtual) view of how a process is stored in memory
- Bused to translate the virtual addresses seen by the application into physical addresses
- Ca segment of virtual memory that has been assigned a direct byte-for-byte correlation with some portion of a file or file-like resource.
- Dnone of the mentioned
33 Define a page tables
- Aprocess refers to the logical (or virtual) view of how a process is stored in memory
- Bused to translate the virtual addresses seen by the application into physical addresses
- Ca segment of virtual memory that has been assigned a direct byte-for-byte correlation with some portion of a file or file-like resource
- Dnone of the mentioned
34Which of the following is incorrect about Subnet Mask
- AThe 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.
- BIt is applied to a message’s destination address to extract the network address.
- CIf the extracted network address matches the local network ID, the destination is located on the local network
- Dto determine whether an IP address exists on the global network or whether it must be routed outside the global network.
35What is a port number for SSH
- ATCP 22
- BTCP 33
- CTCP 25
- DTCP 443
36POP stands for
- APost Office Protocol
- BPostal Office Protocol
- CPop Office Protocol
- DPrefix Office Protocol
37Common port number for web pages
- A80
- B23
- C25
- D110
38Common port number for telnet
- A80
- B23
- C25
- D110
39Common port number for mail
- A80
- B23
- C25 and 110
- D111
40How many classes have a subnet mask
- A1
- B2
- C3
- D4
41At the FILE SYSTEM SECURITY what is an Access right?
- AThe way in which an object is accessed by a subjec
- BAnything to which access is controlled
- CAn entity capable of accessing objects
- DNone of them
42At Linux Virtual File System Concept, The four primary object types in VFS are as follows:
- ASuperblock object, inode object, dentry object, file object
- BSystem object, software object, hardware object, network object
- CVirtual object, physical object, i/o object, calling object
- DFile system object, user object, disk object, mapping object
43What is an EMBEDDED SYSTEMS?
- Acombination of computer hardware and software, and perhaps additional mechanical or other part, designed to perform a dedicated function
- BA file consists of a collection of records
- CThe cache manager calls the log file system to prompt it to flush the log file to disk
- DOnce the log file updates are safely on disk, the cache manager flushes the volume changes to disk
44CHARACTERISTICS OF EMBEDDED OPERATING SYSTEMS, Give definition to Real-time operation:
- AIn many embedded systems, the correctness of a computation depends, in part, on the time at which it is delivered
- BEmbedded software may execute in response to external events
- CCondtional compilation can be used
- DThere is virtually no device that needs to be supported by all versions of the OS, and the range of I/O devices is large
45Give the correct way to “Loading an eCos Configuration”:
- AGNU make utility>>Application source code>>GNU cross compiler>>GNU linker>>Executable file
- BApplication source code>>GNU linker>>GNU cross compiler>>GNU make utility>>Executable file
- CGNU linker>>Application source code>>GNU make utility>>GNU cross compiler>>Executable file
- DGNU cross compiler>>GNU linker>>GNU make utility>>Application source code>>Executable file
46 Choose the correct choice of the “eCos Layered Structure” from bottom- to- top?
- AHardware abstraction layer, Kernel, I/O system, Standard C library, User application code
- BKernel, I/O system, Standard C library, User application code, Hardware abstraction layer
- CUser application code, Standard C library, I/O system, Kernel, Hardware abstraction layer
- DI/O system, Kernel, Hardware abstraction layer, Standard C library, User application code.
47How many implemented separate modules has The HAL?
- A3
- B4
- C5
- D6
48How many main objectives has The eCos Kernel was designed to satisfy?
- A4
- B5
- C6
- D7
49 What does “TINYOS” mean?
- ARepresents a significant departure from other embedded operating systems
- Bis a flag that a thread can check before executing a particular piece of code.
- CA different distributes of Linux.
- DA different versions of Windows
50Three abstractions for resources are used in TinyOS
- ADedicated, Virtualized, Shared
- BAbstracted, Powered, Protected
- CDetermined, Called, Multiplexed
- DNeeded, Controlled, Used
51What is a Computer Security?
- AThe protection afforded to an automated information system in order to attain the applicable objectives of preserving the integrity, availability and confidentiality of information resources
- BComparing the information systems with computer systems
- CUpdating hardware and software
- DCreating the local and global networks for computer system
52This definition introduces three key objectives that are at the heart of computer security
- AConfidentiality, Integrity, Availability
- BProtection, Updating, Creating
- CAttacking, Copying, Pasting
- DDividing, Working, Researching
53Although 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:
- AAuthenticity, Accountability
- BLoggin, Entering
- CAccessibility, Availability
- DRealibility, Security
54Network security attacks can be classified as:
- APassive and active attacks
- BDangerous and undangerous
- CCorrect and incorrect
- DDirect and indirect.
55In an important early study of intrusion, Anderson[ANDE80] identified three classes of intruders:
- AMasquerader, misfeasor, clandestine user
- BIndividual, legitimate, authorized
- CControl, exploit, system
- DOutside, inside, offside.
56How many parts of Memory Hierarchy?
- A5
- B4
- C2
- D3
57 In Memory Hierarchy, at the Outboard storage which of the following are included: o
- ACache
- BMain memory
- CMagnetic tape
- DMagnetic disk
58 In Memory Hierarchy, at the Off-line storage which of the following are included:
- ACache
- BMagnetic disk
- CMagnetic tape
- DMain memory
59In Memory Hierarchy, at the Inboard memory which of the following are included:
- AMain memory
- BMagnetic disk
- CMagnetic tape
- DOptical disk
60 Cache Design has these properties?
- ASize, block size, mapping function, replacement algorithm, write policy
- BSize, search function, write function, read policy, vector algorithm
- CSize, mapping algorithm, vector function, write policy, replacement function o
- DSize, blocking algorithm, search function, replacement vector, read policy
61Three techniques are possible for I/O operations:
- AProgrammed I/O, Interrupt-driven I/O, Direct memory access(DMA)
- BObject-oriented I/O, Design I/O, Usable I/O
- CMachine I/O, Architecture I/O, Hardware I/O
- DControl I/O, Status I/O, Transfer I/O
62How many principles has Deadlock?:
- A3
- B5
- C2
- D6
63Which of the following principles has Deadlock?
- APrevention, Avoidance, Detection
- BExecution, Association, Starvation
- CExclusion, Avoidance, Starvation
- DStarvation, Detection, Exclusion
64Much of the work in security and protection as it relates to operating systems can be roughly grouped into four categories
- AAvailability, confidentiality, data integrity, authenticity
- BSafety, accountability, reliability, density
- CUsability, integrity, confidentiality, reliability
- DFlexibility, availability, accountability, authenticity
65The central themes of operating system design are all concerned with the management of processes and threads?
- AMultiprogramming, multiprocessing, distributed processing
- BMultitasking, multiprogramming, multithreading
- CMultiprocessing, uniprocessing, multitasking
- DMultithreading, distributed processing, uniprocessing
66Which one of the following linux file system does not support journaling feture?
- Aext2
- Bext3
- Cext4
- Dnone of the mentioned
67With the installation of Linux, a super user account is created called as _____
- ASuperuser
- BUser
- CAdministrator
- DRoot
68Which command would you use if you want to remove the password assigned to a group?
- Agpasswd – r
- Bgpasswd – d
- Cuserdel
- Ddelgroup
69What command is used to remove files?
- ADm
- BRm
- CDel
- DErase
- EWc
70 What command is used to remove the directory?
- ARemove
- BRdir
- CMdir
- DDelete
- ERmdir
71 Convert this number systems: BIN(1111000111) to DEC?
- A967
- B912
- C868
- D898
72Convert this number systems: BIN(10101010101) to DEC?:
- A1365
- B1432
- C1295
- D1523
73Convert this number systems: BIN(1100001100) to DEC?
- A780
- B795
- C824
- D912
74 Which of the following is not one of the principles of dealing with deadlock?
- AInitialization
- BPrevention
- CAvoidance
- DDetection
75Current allocation of resources to processes where there is at least one sequence that does not result in deadlock is called:
- ASafe state
- BUnsafe state
- CAmbiguous state
- DAlternative state
76Current allocation of resources to processes where there is no sequence that does not result in deadlock is called
- AUnsafe state
- BSafe state
- CAmbiguous state
- DAlternative state
77Can you solve the Dining Philosophers’ Problem using monitors?
- AYes
- BNo
- CYes, but only if there are less than five philosophers
- DNo, unless there are more than five philosophers
78A fixed-length block of main memory is called:
- AFrame
- BPage
- CSegment
- DSection
79A fixed-length block of data in secondary memory is called:
- AFrame
- BPage
- CSegment
- DSection
80A variable-length block of data that resides in secondary memory is called:
- ASegment
- BFrame
- CPage
- DSection
81When free memory is split into many unconnected pieces we call it:
- AInternal fragmentation
- BExternal fragmentation
- CCompaction
- DMemory distribution
82Memory partitioning algorithm that uses binary tree as a data structure is called:
- AFirst-fit algorithm
- BNext-fit algorithm
- CBuddy system
- DBest-fit algorithm
83A state in which the system spends most of its time swapping pieces rather than executing instructions is called:
- AVirtual memory
- BThrashing
- CSwapping
- DSpanning
84What command do you use to create Linux file systems?
- AFdisk
- BMkfs
- CFsck
- DMount
85 What command is not used to list the files chap01, chap02 and chap04? o
- Als chap*
- Bls chap[124]
- Cls - x chap0[124]
- Dls chap0[124]
86What is operating system?
- Acollection of programs that manages hardware resources
- Bsystem service provider to the application programs
- Clink to interface the hardware and application programs
- Dall of the mentioned
87 The main function of the command interpreter is
- Ato get and execute the next user-specified command
- Bto provide the interface between the API and application program
- Cto handle the files in operating system
- Dnone of the mentioned
88To create a file
- Aallocate the space in file system
- Bmake an entry for new file in directory
- Cboth (a) and (b)
- Dnone of the mentioned
89What is a Server?
- Ais a computer program running to serve the requests of other programs, the "clients".
- BSimple computer
- COptical device
- DTypes of laptops
90 Show incorrect choice, when we mean types of Server:
- ACooking server
- BDatabase server
- CClient server
- DApplication server
91What is a Create file?
- AWhen a new file is created, an entry must be added to the directory
- BWhen a user or application references a file, the directory must be searched to find the entry corresponding to that file.
- CWhen a file is deleted, an entry must be removed from the directory.
- DAll or a portion of the directory may be requested
92What is a Delete file?
- AWhen a file is deleted, an entry must be removed from the directory
- BWhen a user or application references a file, the directory must be searched to find the entry corresponding to that file.
- CWhen a new file is created, an entry must be added to the directory.
- DAll or a portion of the directory may be requested
93Given 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?
- A172.16.12.64
- B172.16.12.57
- C172.16.12.49
- D172.16.12.48
- E172.16.12.63
- F172.16.12.45
94You need to subnet a network that has 5 subnets, each with at least 16 hosts. Which classful subnet mask would you use?
- A255.255.255.192
- B255.255.255.224
- C255.255.255.240
- D255.255.255.248
95 Given the IP address 172.16.12.54 with a mask of 255.255.255.240, which of the following are valid broadcast addresses?
- A172.16.12.64
- B172.16.12.57
- C172.16.12.49
- D172.16.12.48
- E172.16.12.63
- F172.16.12.45
96File type can be represented by
- Afile name
- Bfile extension
- Cfile identifier
- Dnone of the mentioned
97What does GNU stand for?
- AGNU's not Unix
- BGreek Needed Unix
- CGeneral Unix
- DGeneral Noble Unix
- ENone of the above
98Which of the following is not a principle of storage management responsibilities?
- AProcess isolation
- BProcess termination
- CProtection and access control
- DAutomatic allocation and management
99Virtual memory takes advantage of
- AFast CPU
- BLarge secondary memory
- CModular programming
- DScheduling
Información
- Descripción
- HDGGASDGASGD
- Autor
- Arman Karimov
- Idioma
- English
- Visitas
- 26
- Etiquetas
- Valoración
- Aún sin valoraciones Valora este test