Online Access Free 030-100 Exam Questions

How is a comment written in HTML?

• A.<!-- comment -->
• B.// comment
• C./* comment */
• D.# comment

To update data in a table, which SQL command should be used?

• A.UPDATE
• B.ALTER
• C.CHANGE
• D.MODIFY

What is a primary key in an SQL database?

• A.The main field used for joining tables
• B.The highest value in a table
• C.A unique identifier for each row in a table
• D.A password to access the database

In Node.js, what is the main advantage of using asynchronous operations?

• A.They enforce strong typing in JavaScript.
• B.They allow the Node.js server to handle multiple requests simultaneously.
• C.They automatically optimize memory usage.
• D.They make code execution faster.

What is the primary purpose of HTTP cookies?

• A.To store data on the client's machine for state management
• B.To increase network bandwidth efficiency
• C.To provide a user interface
• D.To encrypt data transmissions