Vantage Integrated Security Solutions Interview Questions and Answers

SQL query to return latest login date for each primary key

• Use GROUP BY clause to group by primary key

• Use MAX() function to get the latest login date

• Join the tables if necessary

Use a hashmap to store the frequency of each number in the array.

• Create a hashmap to store the frequency of each number in the array.

• Iterate through the array and update the frequency in the hashmap.

• Retrieve the frequency of the desired number from the hashmap.

Use regular expressions to validate array elements efficiently.

• Use regular expressions to define the rules for validation.

• Iterate through the array and apply the regular expression to each element.

• Return true if all elements pass the validation rules, false otherwise.

SPI, UART, and I2C are communication serial protocols used in embedded systems to transfer data between devices.

• SPI (Serial Peripheral Interface) is a full-duplex synchronous communication protocol commonly used for communication between microcontrollers and peripheral devices.

• UART (Universal Asynchronous Receiver/Transmitter) is a serial communication protocol that uses two wires for data transmission and is commonly ...read more

Kernel space is a protected area of memory where the core of the operating system resides. Device drivers are software that allows the operating system to communicate with hardware devices.

• Kernel space is a privileged area of memory that is reserved for the core components of the operating system.

• Device drivers are software modules that facilitate communication between the operating system and hardware devices.

• Experien...read more

OS boot up sequence involves several steps such as BIOS initialization, bootloader loading, kernel loading, and initialization of system services.

• BIOS (Basic Input/Output System) initialization

• Bootloader loading (e.g. GRUB, LILO)

• Kernel loading and initialization

• Init process execution

• System services initialization