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Preguntas del test (100)
11. TCP/IP stands for
- Ao TCP/IP (Transmission Control Protocol/Internet Protocol)
- Bo TCP/IP (Transfer Control Protocol/Internet Protocol
- Co TCP/IP (Transmission Control Protocol/Individual Protocol)
- Do TCP/IP (Transcript Control Protocol/Internet Protocol)
22. When was TCP/IP developed?
- Ao 1978
- Bo 1977
- Co 1976
- Do 1975
33. With whom TCP/IP was driven
- Ao Kahn and Cerf
- Bo Ronald and Cerf
- Co Cerf and George
- Do McColin and Kahn
44. TCP is higher layer
- AVerdadero
- BFalso
55. What is the function of a subnet mask
- Ao to determine whether an IP address exists on the local network or whether it must be routed outside the local network.
- Bo process that applies binary logic to yield binary results
- Co It sends out ICMP (Internet Control Message Protocol) messages to verify both the logical addresses & the Physical connection.
- Do to determine whether an IP address exists on the global network or whether it must be routed outside the global network.
66. Which of the following is false about Subnet Mask?
- Ao 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.
- Bo It is applied to a message’s destination address to extract the network address.
- Co If the extracted network address matches the local network ID, the destination is located on the local network.
- Do It sends out ICMP (Internet Control Message Protocol) messages to verify both the logical addresses & the Physical connection
77. Define a boolean algebra
- Ao process that applies binary logic to yield binary results
- Bo to determine whether an IP address exists on the local network or whether it must be routed outside the local network.
- Co It sends out ICMP (Internet Control Message Protocol) messages to verify both the logical addresses & the Physical connection.
- Do to determine whether an IP address exists on the global network or whether it must be routed outside the global network.
88. Define class A
- Ao large organizations, governments
- Bo medium sized organizations
- Co small organizations
- Do extra small organisations
99. Define class B
- Ao large organizations, governments
- Bo medium sized organizations
- Co small organizations
- Do extra small organisations
1010. Define class C
- Ao large organizations, governments
- Bo medium sized organizations
- Co small organizations
- Do extra small organisation
1111. In Class A an IP address starts with
- Ao 0
- Bo 10
- Co 110
- Do 1010
1212. In Class C the network prefix is
- Ao 24 bits long
- Bo 16 bits long
- Co 8 bits long
- Do 32 bits long
1313. Into how many classes divided the address space in classful addressing ?
- A5
- B4
- C3
- D2
1414. How many layers have ISO/OSI Network Model
- A7
- B6
- C8
- D5
1515. What is a link layer
- Ao Includes device driver and network interface card
- Bo Handles the movement of packets
- Co Provides a reliable flow of data between two hosts
- Do Handles the details of the particular application
1616. What is a network layer
- Ao Includes device driver and network interface card
- Bo Handles the movement of packets
- Co Provides a reliable flow of data between two hosts
- Do Handles the details of the particular application
1717. What is a transport layer
- Ao Includes device driver and network interface card
- Bo Handles the movement of packets
- Co Provides a reliable flow of data between two hosts
- Do Handles the details of the particular application
1818. What is an application layer
- Ao Includes device driver and network interface card
- Bo Handles the movement of packets
- Co Provides a reliable flow of data between two hosts
- Do Handles the details of the particular application
1919. In Class B an IP address starts with
- Ao 0
- Bo 10
- Co 110
- Do 1010
2020. In Class C an IP address starts with
- Ao 0
- Bo 10
- Co 110
- Do 1010
2121. In Class A the network prefix is
- Ao 24 bits long
- Bo 16 bits long
- Co 8 bits long
- Do 32 bits long
2222. In Class B the network prefix is
- Ao 24 bits long
- Bo 16 bits long
- Co 8 bits long
- Do 32 bits long
2323. PING stands for
- Ao Packet Internet Groper
- Bo Pocket Internet Groper
- Co Ping Internet Groper
- Do Packet Internet Gathering
2424. ICMP stands for
- Ao Internet Control Message Protocol
- Bo Internet Control Machine Protocol
- Co Internet Clarify Message Protocol
- Do Internet Control Management Protocol
2525. Define PING
- Ao command verifies OSI Layer 3
- Bo verifies both the logical addresses & the Physical connection
- Co process that applies binary logic to yield binary results
- Do verifies the Physical connection
2626. Virtual memory provides
- Ao Automatic storage allocation
- Bo Protection
- Co Sharibility
- Do All the above
2727. Where Virtual Machine was developed?
- Ao Lancaster University
- Bo Manchester University
- Co MIT
- Do Cambridge
2828. What is the first commercial computer with virtual machine
- Ao B5000
- Bo B5550
- Co B5500
- Do C5000
2929. When was the first commercial computer with virtual machine released?
- Ao 1961
- Bo 1962
- Co 1963
- Do 1964
3030. Which of the following is false about VM and performance?
- Ao Better performance: we can use more memory than we have
- Bo Nothing; mapping to memory or disk is just as easy
- Co Worse performance: reading from disk is slower than RAM
- Do Good performance: reading from disk is slower than RAM
3131. Which of the following is false about usability of Virtual Memory?
- Ao Not enough memory
- Bo Holes in the address space
- Co Keeping program secure
- Do Keeping program insecure
3232. Define virtual address space
- Ao process refers to the logical (or virtual) view of how a process is stored in memory
- Bo used to translate the virtual addresses seen by the application into physical addresses
- Co 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.
- Do none of the mentioned
3333. Define a page tables
- Ao process refers to the logical (or virtual) view of how a process is stored in memory
- Bo used to translate the virtual addresses seen by the application into physical addresses
- Co 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.
- Do none of the mentioned
3434. Which of the following is incorrect about Subnet Mask
- Ao 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.
- Bo It is applied to a message’s destination address to extract the network address.
- Co to determine whether an IP address exists on the global network or whether it must be routed outside the global network.
- Do If the extracted network address matches the local network ID, the destination is located on the local network.
3535. What is a port number for SSH
- Ao TCP 22
- Bo TCP 33
- Co TCP 25
- Do TCP 443
3636. POP stands for
- Ao Post Office Protocol
- Bo Postal Office Protocol
- Co Pop Office Protocol
- Do Prefix Office Protocol
3737. Common port number for web pages
- Ao 80
- Bo 23
- Co 25
- Do 110
3838. Common port number for telnet
- Ao 80
- Bo 23
- Co 25
- Do 110
3939. Common port number for mail
- Ao 80
- Bo 23
- Co 25 and 110
- Do 111
4040. How many classes have a subnet mask
- A1
- B2
- C3
- D4
4141. At the FILE SYSTEM SECURITY what is an Access right?
- Ao The way in which an object is accessed by a subject
- Bo Anything to which access is controlled
- Co An entity capable of accessing objects
- Do None of them
4242. At Linux Virtual File System Concept, The four primary object types in VFS are as follows:
- Ao Superblock object, inode object, dentry object, file object
- Bo System object, software object, hardware object, network object
- Co Virtual object, physical object, i/o object, calling object
- Do File system object, user object, disk object, mapping object
4343. What is an EMBEDDED SYSTEMS?
- Ao combination of computer hardware and software, and perhaps additional mechanical or other part, designed to perform a dedicated function
- Bo A file consists of a collection of records
- Co The cache manager calls the log file system to prompt it to flush the log file to disk.
- Do Once the log file updates are safely on disk, the cache manager flushes the volume changes to disk
4444. CHARACTERISTICS OF EMBEDDED OPERATING SYSTEMS, Give definition to Real-time operation:
- Ao In many embedded systems, the correctness of a computation depends, in part, on the time at which it is delivered
- Bo Embedded software may execute in response to external events
- Co Condtional compilation can be used
- Do 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
4545. Give the correct way to “Loading an eCos Configuration”:
- Ao GNU make utility>>Application source code>>GNU cross compiler>>GNU linker>>Executable file
- Bo Application source code>>GNU linker>>GNU cross compiler>>GNU make utility>>Executable file
- Co GNU linker>>Application source code>>GNU make utility>>GNU cross compiler>>Executable file
- Do GNU cross compiler>>GNU linker>>GNU make utility>>Application source code>>Executable file
4646. Choose the correct choice of the “eCos Layered Structure” from bottom- to- top?
- Ao Hardware abstraction layer, Kernel, I/O system, Standard C library, User application code
- Bo Kernel, I/O system, Standard C library, User application code, Hardware abstraction layer
- Co User application code, Standard C library, I/O system, Kernel, Hardware abstraction layer
- Do I/O system, Kernel, Hardware abstraction layer, Standard C library, User application code.
4747. How many implemented separate modules has The HAL?
- A3
- B4
- C5
- D6
4848. How many main objectives has The eCos Kernel was designed to satisfy?
- A4
- B5
- C6
- D7
4949. What does “TINYOS” mean?
- Ao Represents a significant departure from other embedded operating systems
- Bo is a flag that a thread can check before executing a particular piece of code.
- Co A different distributes of Linux.
- Do A different versions of Windows.
5050. Three abstractions for resources are used in TinyOS:
- Ao Dedicated, Virtualized, Shared
- Bo Abstracted, Powered, Protected
- Co Determined, Called, Multiplexed
- Do Needed, Controlled, Used
5151. What is a Computer Security?
- Ao 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
- Bo Comparing the information systems with computer systems
- Co Updating hardware and software
- Do Creating the local and global networks for computer systems
5252. This definition introduces three key objectives that are at the heart of computer security:
- Ao Confidentiality, Integrity, Availability
- Bo Protection, Updating, Creating
- Co Attacking, Copying, Pasting
- Do Dividing, Working, Researching
5353. 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:
- Ao Authenticity, Accountability
- Bo Loggin, Entering
- Co Accessibility, Availability
- Do Realibility, Security
5454. Network security attacks can be classified as:
- Ao Passive and active attacks
- Bo Dangerous and undangerous
- Co Correct and incorrect
- Do Direct and indirect.
5555. In an important early study of intrusion, Anderson[ANDE80] identified three classes of intruders:
- Ao Masquerader, misfeasor, clandestine user
- Bo Individual, legitimate, authorized
- Co Control, exploit, system
- Do Outside, inside, offside.
5656. How many parts of Memory Hierarchy?
- A5
- B4
- C3
- D2
5757. In Memory Hierarchy, at the Outboard storage which of the following are included:
- Ao Cache
- Bo Main memory
- Co Magnetic tape
- Do Magnetic disk
5858. In Memory Hierarchy, at the Off-line storage which of the following are included:
- Ao Cache
- Bo Magnetic disk
- Co Magnetic tape
- Do Main memory
5959. In Memory Hierarchy, at the Inboard memory which of the following are included:
- Ao Main memory
- Bo Magnetic disk
- Co Magnetic tape
- Do Optical disk
6060. Cache Design has these properties?
- Ao Size, block size, mapping function, replacement algorithm, write policy
- Bo Size, search function, write function, read policy, vector algorithm
- Co Size, mapping algorithm, vector function, write policy, replacement function
- Do Size, blocking algorithm, search function, replacement vector, read policy
6161. Three techniques are possible for I/O operations:
- Ao Programmed I/O, Interrupt-driven I/O, Direct memory access(DMA)
- Bo Object-oriented I/O, Design I/O, Usable I/O
- Co Machine I/O, Architecture I/O, Hardware I/O
- Do Control I/O, Status I/O, Transfer I/O
6262. How many principles has Deadlock?:
- Ao 3
- Bo 5
- Co 2
- Do 6
6363. Which of the following principles has Deadlock?
- Ao Prevention, Avoidance, Detection
- Bo Execution, Association, Starvation
- Co Exclusion, Avoidance, Starvation
- Do Starvation, Detection, Exclusion
6464. Much of the work in security and protection as it relates to operating systems can be roughly grouped into four categories?
- Ao Availability, confidentiality, data integrity, authenticity
- Bo Safety, accountability, reliability, density
- Co Usability, integrity, confidentiality, reliability
- Do Flexibility, availability, accountability, authenticity
6565. The central themes of operating system design are all concerned with the management of processes and threads?
- Ao Multiprogramming, multiprocessing, distributed processing
- Bo Multitasking, multiprogramming, multithreading
- Co Multiprocessing, uniprocessing, multitasking
- Do Multithreading, distributed processing, uniprocessing
6666. Which one of the following linux file system does not support journaling feture?
- Ao ext2
- Bo ext3
- Co ext4
- Do none of the mentioned
6767. With the installation of Linux, a super user account is created called as _____
- Ao Superuser
- Bo User
- Co Administrator
- Do Root
6868. Which command would you use if you want to remove the password assigned to a group?
- Ao gpasswd – r
- Bo gpasswd – d
- Co userdel
- Do delgroup
6969. What command is used to remove files?
- Ao Dm
- Bo Rm
- Co Del
- Do Erase
- Eo Wc
7070. What command is used to remove the directory?
- Ao Remove
- Bo Rdir
- Co Mdir
- Do Delete
- Eo Rmdir
7171. Convert this number systems: BIN(1111000111) to DEC?
- Ao 967
- Bo 912
- Co 868
- Do 898
7272. Convert this number systems: BIN(10101010101) to DEC?:
- Ao 1365
- Bo 1432
- Co 1295
- Do 1523
7373. Convert this number systems: BIN(1100001100) to DEC?:
- Ao 780
- Bo 795
- Co 824
- Do 912
7474. Convert this number systems: BIN(1111000111) to DEC?
- Ao 967
- Bo 912
- Co 868
- Do 898
7575. Which of the following is not one of the principles of dealing with deadlock?
- Ao Initialization
- Bo Prevention
- Co Avoidance
- Do Detection
7676. Current allocation of resources to processes where there is at least one sequence that does not result in deadlock is called:
- Ao Safe state
- Bo Unsafe state
- Co Ambiguous state
- Do Alternative state
7777. Current allocation of resources to processes where there is no sequence that does not result in deadlock is called:
- Ao Unsafe state
- Bo Safe state
- Co Ambiguous state
- Do Alternative state
7878. Can you solve the Dining Philosophers’ Problem using monitors?
- Ao Yes
- Bo No
- Co Yes, but only if there are less than five philosophers
- Do No, unless there are more than five philosophers
7979. A fixed-length block of main memory is called:
- Ao Frame
- Bo Page
- Co Segment
- Do Section
8080. A fixed-length block of data in secondary memory is called:
- Ao Frame
- Bo Page
- Co Segment
- Do Section
8181. A variable-length block of data that resides in secondary memory is called:
- Ao Frame
- Bo Page
- Co Segment
- Do Section
8282. When free memory is split into many unconnected pieces we call it:
- Ao Internal fragmentation
- Bo External fragmentation
- Co Compaction
- Do Memory distribution
8383. Memory partitioning algorithm that uses binary tree as a data structure is called:
- Ao First-fit algorithm
- Bo Next-fit algorithm
- Co Buddy system
- Do Best-fit algorithm
8484. A state in which the system spends most of its time swapping pieces rather than executing instructions is called:
- Ao Virtual memory
- Bo Thrashing
- Co Swapping
- Do Spanning
8585. What command do you use to create Linux file systems?
- Ao Fdisk
- Bo Mkfs
- Co Fsck
- Do Mount
8686. What command is not used to list the files chap01, chap02 and chap04?
- Ao ls chap*
- Bo ls chap[124]
- Co ls - x chap0[124]
- Do ls chap0[124]
8787. What is operating system?
- Ao collection of programs that manages hardware resources
- Bo system service provider to the application programs
- Co link to interface the hardware and application programs
- Do all of the mentioned
8888. The main function of the command interpreter is
- Ao to get and execute the next user-specified command
- Bo to provide the interface between the API and application program
- Co to handle the files in operating system
- Do none of the mentioned
8989. To create a file
- Ao allocate the space in file system
- Bo make an entry for new file in directory
- Co both (a) and (b)
- Do none of the mentioned
9090. What is a Server?
- Ao is a computer program running to serve the requests of other programs, the "clients".
- Bo Simple computer
- Co Optical device
- Do Types of laptops
9191. Show incorrect choice, when we mean types of Server:
- Ao Cooking server
- Bo Database server
- Co Client server
- Do Application server
9292. What is a Create file?
- Ao When a new file is created, an entry must be added to the directory
- Bo When a user or application references a file, the directory must be searched to find the entry corresponding to that file..
- Co When a file is deleted, an entry must be removed from the directory.
- Do All or a portion of the directory may be requested.
9393. What is a Delete file?
- Ao When a file is deleted, an entry must be removed from the directory
- Bo When a user or application references a file, the directory must be searched to find the entry corresponding to that file..
- Co When a new file is created, an entry must be added to the directory.
- Do All or a portion of the directory may be requested.
9494. 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?
- Ao 172.16.12.64
- Bo 172.16.12.57
- Co 172.16.12.49
- Do 172.16.12.48
- Eo 172.16.12.63
- Fo 172.16.12.45
9595. You need to subnet a network that has 5 subnets, each with at least 16 hosts. Which classful subnet mask would you use?
- Ao 255.255.255.192
- Bo 255.255.255.224
- Co 255.255.255.240
- Do 255.255.255.248
9696. Given the IP address 172.16.12.54 with a mask of 255.255.255.240, which of the following are valid broadcast addresses?
- Ao 172.16.12.64
- Bo 172.16.12.57
- Co 172.16.12.49
- Do 172.16.12.48
- Eo 172.16.12.63
- Fo 172.16.12.45
9797. File type can be represented by
- Ao file name
- Bo file extension
- Co file identifier
- Do none of the mentioned
9898. What does GNU stand for?
- Ao GNU's not Unix
- Bo Greek Needed Unix
- Co General Unix
- Do General Noble Unix
- Eo None of the above
9999. Which of the following is not a principle of storage management responsibilities?
- Ao Process isolation
- Bo Process termination
- Co Automatic allocation and management
- Do Protection and access control
100100. Virtual memory takes advantage of
- Ao Fast CPU
- Bo Large secondary memory
- Co Modular programming
- Do Scheduling
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