V S Potdar & Co Interview Questions and Answers

APIPA stands for Automatic Private IP Addressing, used when a device cannot obtain an IP address from a DHCP server.

• APIPA assigns a unique IP address in the range of 169.254.0.1 to 169.254.255.254 when DHCP is not available.

• It allows devices to communicate on a local network without manual configuration.

• APIPA is commonly used in small home or office networks where a DHCP server is not present.

DNS stands for Domain Name System, which translates domain names to IP addresses.

• DNS is like a phone book for the internet, translating human-readable domain names (like google.com) to IP addresses (like 172.217.3.174).

• It helps users access websites and other online services by translating domain names into numerical IP addresses that computers can understand.

• DNS also helps in email delivery by translating domain names in email addresses to IP addresses of mail servers.

• DNS op...read more

IP class ranges are predefined ranges of IP addresses used for assigning to devices on a network.

• There are five classes of IP addresses: A, B, C, D, and E.

• Each class has a specific range of IP addresses that can be assigned.

• Class A addresses range from 1.0.0.0 to 126.0.0.0.

• Class B addresses range from 128.0.0.0 to 191.255.0.0.

• Class C addresses range from 192.0.0.0 to 223.255.255.0.

• Class D addresses are reserved for multicast groups.

• Class E addresses are reserved for experimen...read more

A gateway is a network node that connects two different networks, allowing them to communicate with each other.

• Acts as an entry and exit point for data traffic between networks

• Can be a hardware device or software program

• Common examples include routers and firewalls

The OSI model is a conceptual framework that standardizes the functions of a telecommunication or computing system into seven layers.

• The OSI model stands for Open Systems Interconnection model.

• It divides network communication into seven layers: Physical, Data Link, Network, Transport, Session, Presentation, and Application.

• Each layer has specific functions and interacts with adjacent layers for data transmission.

• For example, the Physical layer deals with the physical connecti...read more

SQL query to join 2 tables

• Use the JOIN keyword to combine rows from two tables based on a related column between them

• Specify the columns to be selected from each table

• Use ON keyword to specify the join condition

SQL is a programming language used for managing and manipulating databases.

• SQL stands for Structured Query Language

• It is used to communicate with databases to perform tasks such as querying data, updating data, and creating tables

• Common SQL commands include SELECT, INSERT, UPDATE, DELETE

• SQL is used in various database management systems such as MySQL, Oracle, and SQL Server