XcelServ Solutions Interview Questions and Answers

HLOOKUP is a function in Excel used to search for a value in the top row of a table and return a corresponding value from a specified row.

• HLOOKUP stands for Horizontal Lookup.

• It is commonly used to retrieve data from a table based on a specific criteria.

• The function takes four arguments: lookup_value, table_array, row_index_num, and range_lookup.

• lookup_value is the value to search for in the top row of the table.

• table_array is the range of cells that contains the table.

• row_in...read more

Vlookup is a function in Excel used to search for a value in the leftmost column of a table and return a corresponding value from another column.

• Vlookup stands for 'vertical lookup'.

• It is commonly used to retrieve data from a large dataset based on a specific criteria.

• The function requires four arguments: lookup value, table array, column index number, and range lookup.

• Vlookup can be used to perform approximate or exact matches.

• It is often used for tasks like merging data fro...read more

VPN stands for Virtual Private Network, a secure connection that allows users to access a private network over the internet.

• VPN creates a secure and encrypted connection between a user's device and a private network, allowing for secure data transmission.

• It is commonly used by remote workers to access company resources securely.

• VPNs can also be used to bypass geo-restrictions and access region-locked content.

• Popular VPN services include NordVPN, ExpressVPN, and CyberGhost.

SSL handshake is the process of securely exchanging keys and establishing a secure connection between a client and a server.

• SSL handshake is the initial step in establishing a secure connection over HTTPS.

• During the handshake, the client and server exchange encryption keys and agree on the encryption algorithm to use.

• The SSL handshake involves multiple steps including client hello, server hello, certificate exchange, key exchange, and finished messages.

• The SSL handshake ensur...read more

The internet is a global network of interconnected computers and servers that allows for communication and sharing of information.

• The internet is a network of networks, connecting billions of devices worldwide.

• It allows for communication through various means such as email, messaging, video calls, etc.

• Users can access a vast amount of information and services on the internet, such as websites, online shopping, social media, etc.

• The internet is made up of protocols like TCP/IP...read more

IPSec stands for Internet Protocol Security, a protocol suite used to secure Internet Protocol (IP) communications.

• IPSec provides secure communication by authenticating and encrypting each IP packet in a data stream.

• It is commonly used in VPNs to ensure secure data transmission over public networks.

• IPSec operates at the network layer of the OSI model, providing end-to-end security.

• It includes protocols like Authentication Header (AH) and Encapsulating Security Payload (ESP) f...read more

Manual testing is the process of manually testing software for defects, functionality, and usability.

• Involves testers executing test cases manually without the use of automation tools

• Requires human intervention to observe and verify the behavior of the software

• Helps in identifying user interface issues, usability problems, and other defects

• Can be time-consuming and prone to human error

• Examples: Exploratory testing, ad-hoc testing, regression testing