Expert Interview Questions and Answers

Baud rate is the rate at which data is transmitted over a communication channel.

• Baud rate is measured in bits per second (bps).

• Higher baud rates allow for faster data transmission.

• Baud rate must be set the same on both ends of the communication channel.

• Incorrect baud rate settings can result in data corruption or loss.

• Examples of communication channels that use baud rate include UART, SPI, and I2C.

I2C is a serial communication protocol used to connect multiple devices with two wires. Pull-up resistors are necessary for proper communication.

• I2C uses a master-slave architecture where the master initiates communication.

• Each device on the bus has a unique address assigned to it.

• Data is transmitted in packets with a start and stop bit.

• Pull-up resistors are necessary to ensure proper voltage levels on the bus.

• The valu...read more

New and old are trigger context variables in Salesforce that store the new and old versions of a record being processed.

• New stores the updated version of the record being processed in a trigger.

• Old stores the previous version of the record being processed in a trigger.

• New and old are used to compare changes made to a record in a trigger.

• New and old are only available in before and after triggers, not in validation or w

No, using old methods for data update is not recommended.

• Old methods may not be compatible with new systems

• Old methods may not have the necessary security measures

• Using old methods can lead to data corruption or loss

SOQL is used to query records from a single object, while SOSL is used to search for records across multiple objects.

• SOQL is used to retrieve data from a single object based on conditions

• SOSL is used to search for data across multiple objects based on search terms

• SOQL supports aggregate functions, while SOSL does not

• SOQL is case-sensitive, while SOSL is not

• SOQL queries are limited to 100 records, while SOSL can return

Governor limits are limits enforced by Salesforce to ensure efficient use of shared resources.

• Governor limits are enforced on Apex code, SOQL queries, DML statements, and other operations.

• They prevent runaway code from monopolizing shared resources and causing performance issues.

• Examples of governor limits include limits on CPU time, heap size, and database queries.

• Developers must design their code to work within these...read more

To run an Apex class, we need to create an instance of the class and call its methods. Precautions include testing and avoiding governor limits.

• Create an instance of the class using the 'new' keyword

• Call the methods using dot notation

• Test the class thoroughly before deploying to production

• Avoid hitting governor limits by optimizing code and limiting queries

Lightning Data Service is a framework that allows developers to easily access and manipulate data in Salesforce.

• It provides a standard interface for data manipulation

• It automatically handles data caching and synchronization

• It supports CRUD operations on records and fields

• It can be used with Lightning Components and Apex controllers

The number of branches to handle as a cluster manager varies depending on the company and industry.

• The number of branches can range from 5 to 50 or more.

• The size of the branches and the complexity of the sales process can also affect the number of branches a cluster manager handles.

• The cluster manager is responsible for overseeing the sales performance of all branches in their cluster.

• They must ensure that each branch ...read more

Interface between LTE refers to the connection between the LTE network and other networks or devices.

• LTE interfaces with other cellular networks such as 3G and 2G through inter-RAT handover

• LTE also interfaces with non-cellular networks such as Wi-Fi and Ethernet through evolved packet core (EPC)

• LTE devices interface with the LTE network through the air interface using radio frequency signals

• LTE also interfaces with cor...read more

X2 interface is a communication interface between two eNodeBs in LTE network.

• X2 interface is used for inter-cell handover and load balancing.

• It is a point-to-point interface that connects two eNodeBs.

• X2 interface is used for exchanging control and user plane data between eNodeBs.

• It is a critical interface for LTE network performance and reliability.

• X2 interface supports various protocols such as S1AP, GTP, and RANAP.

LTE has 20 MHz bandwidth divided into 100 resource blocks. Each resource block has 12 subcarriers and 7 symbols.

• LTE has 20 MHz bandwidth

• Divided into 100 resource blocks

• Each resource block has 12 subcarriers and 7 symbols

KPIs (Key Performance Indicators) of LTE include throughput, latency, coverage, and call setup success rate.

• Throughput measures the amount of data that can be transmitted over the network in a given time period.

• Latency measures the time it takes for data to travel from the source to the destination.

• Coverage measures the area where the network signal is available.

• Call setup success rate measures the percentage of succes...read more

CSFB stands for Circuit Switched Fallback, a technology that allows LTE devices to fallback to 2G or 3G networks for voice calls.

• CSFB is used when a LTE device is unable to make a voice call over the LTE network.

• It allows the device to switch to a 2G or 3G network for voice calls.

• CSFB is a temporary solution until VoLTE (Voice over LTE) becomes more widely available.

• CSFB can cause call setup delays and impact the user

OFDMA is used in LTE to improve spectral efficiency and support multiple users simultaneously.

• OFDMA allows for multiple users to share the same frequency band by dividing it into smaller subcarriers.

• It also enables dynamic allocation of subcarriers to users based on their bandwidth requirements.

• This results in better spectral efficiency and higher data rates.

• OFDMA is also resistant to interference and fading, making it...read more

FDD and TDD are two different duplexing techniques used in wireless communication.

• FDD stands for Frequency Division Duplexing and TDD stands for Time Division Duplexing.

• In FDD, separate frequency bands are used for uplink and downlink communication, while in TDD, the same frequency band is used for both uplink and downlink communication.

• FDD is used in technologies like 2G, 3G, and 4G LTE, while TDD is used in technolog...read more

Massive MIMO stands for Massive Multiple Input Multiple Output. It is a wireless communication technology that uses a large number of antennas at the base station to improve network performance.

• Massive MIMO uses a large number of antennas at the base station to improve network performance.

• It can significantly increase the capacity and coverage of wireless networks.

• It works by using spatial multiplexing to transmit mult...read more

Handover is the process of transferring an ongoing call or data session from one cell to another.

• There are two types of handover: Hard Handover and Soft Handover.

• Hard Handover involves breaking the connection with the current cell before establishing a connection with the new cell.

• Soft Handover involves establishing a connection with the new cell before breaking the connection with the current cell.

• The handover process...read more