Q. What is the purpose of error control in WAN communication?
A.
To increase transmission speed
B.
To ensure data integrity during transmission
C.
To reduce the number of devices in the network
D.
To manage IP addressing
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Solution
Error control in WAN communication is essential for ensuring data integrity during transmission, detecting and correcting errors.
Correct Answer:
B
— To ensure data integrity during transmission
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Q. What is the purpose of error control in WANs?
A.
To increase data transmission speed
B.
To ensure data integrity during transmission
C.
To manage network congestion
D.
To provide encryption for data
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Solution
Error control in WANs is used to ensure data integrity during transmission by detecting and correcting errors.
Correct Answer:
B
— To ensure data integrity during transmission
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Q. What is the purpose of ETL in data warehousing?
A.
Extract, Transform, Load
B.
Evaluate, Test, Launch
C.
Execute, Transfer, Log
D.
Enhance, Transfer, Load
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Solution
ETL stands for Extract, Transform, Load, which is the process of moving data from source systems into a data warehouse.
Correct Answer:
A
— Extract, Transform, Load
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Q. What is the purpose of feedback in op-amp circuits?
A.
To increase gain
B.
To stabilize the output
C.
To reduce power consumption
D.
To isolate the input
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Solution
Feedback is used in op-amp circuits to stabilize the output and control the gain.
Correct Answer:
B
— To stabilize the output
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Q. What is the purpose of indexing in a database?
A.
To enforce data integrity
B.
To speed up data retrieval
C.
To normalize data
D.
To create relationships between tables
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Solution
Indexing is used to speed up data retrieval operations on a database.
Correct Answer:
B
— To speed up data retrieval
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Q. What is the purpose of indexing in a distributed database?
A.
To increase data redundancy
B.
To speed up data retrieval
C.
To ensure data consistency
D.
To manage user permissions
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Solution
Indexing in a distributed database is used to speed up data retrieval by creating a data structure that allows for faster searches.
Correct Answer:
B
— To speed up data retrieval
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Q. What is the purpose of indexing in distributed databases?
A.
To increase data redundancy
B.
To speed up data retrieval
C.
To ensure data consistency
D.
To simplify data entry
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Solution
Indexing in distributed databases is used to speed up data retrieval by providing a quick way to look up data without scanning the entire database.
Correct Answer:
B
— To speed up data retrieval
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Q. What is the purpose of inter-VLAN routing?
A.
To connect different physical networks
B.
To allow communication between VLANs
C.
To increase network security
D.
To reduce network latency
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Solution
Inter-VLAN routing allows devices on different VLANs to communicate with each other, typically using a router or a Layer 3 switch.
Correct Answer:
B
— To allow communication between VLANs
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Q. What is the purpose of IPsec in network security?
A.
To provide secure email communication
B.
To encrypt IP packets for secure transmission
C.
To manage network traffic
D.
To authenticate users
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Solution
IPsec (Internet Protocol Security) is used to encrypt and authenticate IP packets, providing secure communication over IP networks.
Correct Answer:
B
— To encrypt IP packets for secure transmission
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Q. What is the purpose of normalization in a database?
A.
To increase redundancy
B.
To eliminate data anomalies
C.
To improve query performance
D.
To simplify database design
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Solution
Normalization is a process that organizes data to reduce redundancy and improve data integrity by eliminating data anomalies.
Correct Answer:
B
— To eliminate data anomalies
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Q. What is the purpose of normalization in database design?
A.
To increase redundancy
B.
To eliminate data anomalies
C.
To simplify the ER diagram
D.
To enhance query performance
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Solution
Normalization is used to eliminate data anomalies and reduce redundancy in database design.
Correct Answer:
B
— To eliminate data anomalies
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Q. What is the purpose of normalization in databases?
A.
To increase redundancy
B.
To reduce data anomalies
C.
To improve performance
D.
To simplify queries
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Solution
The purpose of normalization in databases is to reduce data anomalies and ensure data integrity.
Correct Answer:
B
— To reduce data anomalies
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Q. What is the purpose of subnetting in IP routing?
A.
To increase the size of the broadcast domain
B.
To improve network performance and security
C.
To simplify routing protocols
D.
To assign static IP addresses
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Solution
Subnetting is used to divide a larger network into smaller, manageable sub-networks, improving performance and security by reducing broadcast domains.
Correct Answer:
B
— To improve network performance and security
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Q. What is the purpose of subnetting?
A.
To increase the size of a network
B.
To improve network security
C.
To divide a larger network into smaller, manageable segments
D.
To enhance data transmission speed
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Solution
Subnetting is used to divide a larger network into smaller, manageable segments, improving organization and efficiency.
Correct Answer:
C
— To divide a larger network into smaller, manageable segments
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Q. What is the purpose of tagging frames in a VLAN?
A.
To encrypt the data
B.
To identify the VLAN membership
C.
To increase the frame size
D.
To improve transmission speed
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Solution
Tagging frames in a VLAN is used to identify the VLAN membership of the frame, allowing switches to properly route the traffic.
Correct Answer:
B
— To identify the VLAN membership
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Q. What is the purpose of the 'GROUP BY' clause in SQL?
A.
To sort the result set
B.
To aggregate data across multiple records
C.
To filter records
D.
To join multiple tables
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Solution
'GROUP BY' is used to aggregate data across multiple records, often used with aggregate functions like COUNT, SUM, AVG.
Correct Answer:
B
— To aggregate data across multiple records
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Q. What is the purpose of the 'MOV' instruction in the 8051 assembly language?
A.
To add two numbers
B.
To move data from one location to another
C.
To compare two values
D.
To jump to a different part of the program
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Solution
The 'MOV' instruction is used to move data from one location to another in the 8051 assembly language.
Correct Answer:
B
— To move data from one location to another
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Q. What is the purpose of the 'WITH (NOLOCK)' hint in SQL Server 2000?
A.
To lock the table
B.
To prevent deadlocks
C.
To allow dirty reads
D.
To optimize performance
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Solution
'WITH (NOLOCK)' allows dirty reads by not placing shared locks on the data.
Correct Answer:
C
— To allow dirty reads
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Q. What is the purpose of the accumulator in the 8051 microcontroller?
A.
Data storage
B.
Arithmetic operations
C.
Control operations
D.
Input/output operations
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Solution
The accumulator is primarily used for arithmetic operations in the 8051 microcontroller.
Correct Answer:
B
— Arithmetic operations
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Q. What is the purpose of the clock input in flip-flops?
A.
To reset the flip-flop
B.
To synchronize data storage
C.
To amplify the input signal
D.
To control the output voltage
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Solution
The clock input in flip-flops is used to synchronize data storage, ensuring that changes occur at specific times.
Correct Answer:
B
— To synchronize data storage
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Q. What is the purpose of the clock signal in flip-flops?
A.
To reset the flip-flop
B.
To synchronize data storage
C.
To amplify the signal
D.
To provide power
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Solution
The clock signal is used to synchronize data storage in flip-flops, determining when the input data is captured.
Correct Answer:
B
— To synchronize data storage
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Q. What is the purpose of the control unit in a microprocessor?
A.
To execute arithmetic operations
B.
To manage data storage
C.
To direct the operation of the processor
D.
To provide power management
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Solution
The control unit directs the operation of the processor by managing the execution of instructions and coordinating the activities of the other components.
Correct Answer:
C
— To direct the operation of the processor
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Q. What is the purpose of the DataAdapter in ADO.NET when dealing with XML?
A.
To connect to a database
B.
To fill a DataSet with data from XML
C.
To execute commands against XML data
D.
To manage transactions
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Solution
The DataAdapter is used to fill a DataSet with data from XML and to update the XML data source.
Correct Answer:
B
— To fill a DataSet with data from XML
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Q. What is the purpose of the discharge pin in a 555 timer?
A.
To charge the timing capacitor
B.
To discharge the timing capacitor
C.
To control the output frequency
D.
To set the timer mode
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Solution
The discharge pin is used to discharge the timing capacitor when the output goes low.
Correct Answer:
B
— To discharge the timing capacitor
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Q. What is the purpose of the ICMP protocol in IP routing?
A.
To establish connections
B.
To provide error messages and operational information
C.
To encrypt data
D.
To manage bandwidth
Show solution
Solution
ICMP (Internet Control Message Protocol) is used to send error messages and operational information about IP processing.
Correct Answer:
B
— To provide error messages and operational information
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Q. What is the purpose of the IP address in TCP/IP?
A.
To identify the physical location of a device
B.
To provide a unique identifier for a device on a network
C.
To encrypt data during transmission
D.
To manage bandwidth allocation
Show solution
Solution
The IP address serves as a unique identifier for a device on a network, allowing for proper routing of data.
Correct Answer:
B
— To provide a unique identifier for a device on a network
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Q. What is the purpose of the IPv6 address ::1?
A.
Global unicast address
B.
Link-local address
C.
Multicast address
D.
Loopback address
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Solution
::1 is the loopback address in IPv6, used to refer to the local host.
Correct Answer:
D
— Loopback address
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Q. What is the purpose of the IPv6 address prefix?
A.
To identify the host within a network
B.
To define the network portion of the address
C.
To provide a unique identifier for the device
D.
To indicate the type of service
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Solution
The IPv6 address prefix defines the network portion of the address, allowing for efficient routing and addressing within the network.
Correct Answer:
B
— To define the network portion of the address
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Q. What is the purpose of the IPv6 address prefix?
A.
To identify the host within a network
B.
To define the network portion of the address
C.
To provide a unique identifier for the device
D.
To indicate the type of service
Show solution
Solution
The IPv6 address prefix defines the network portion of the address, allowing for efficient routing and addressing within the network.
Correct Answer:
B
— To define the network portion of the address
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Q. What is the purpose of the IPv6 address prefix?
A.
To identify the host within a network
B.
To define the network portion of the address
C.
To provide a unique identifier for the device
D.
To indicate the type of service
Show solution
Solution
The IPv6 address prefix defines the network portion of the address, allowing for efficient routing and addressing within the network.
Correct Answer:
B
— To define the network portion of the address
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