some objectives with answer

 

1. What does the JavaScript NaN stand for? A) Not a Null B) Not a Name C) Not a Number D) Not a Node

2. Which operator is used to concatenate strings in JavaScript? A) + B) & C) * D) /

3. Which method is used to convert a string to lowercase in JavaScript? A) toLowerCase() B) toUpperCase() C) lowerCase() D) upperCase()

4. Which layer of the OSI model is responsible for establishing, maintaining, and terminating connections between applications? A) Network Layer B) Transport Layer C) Session Layer D) Presentation Layer

5. Which layer of the OSI model provides services like file transfer and email? A) Network Layer B) Application Layer C) Transport Layer D) Data Link Layer

6. Which layer of the OSI model is responsible for routing and forwarding packets between networks? A) Physical Layer B) Data Link Layer C) Network Layer D) Transport Layer

7. What is the primary purpose of Packet Tracer? A) Network monitoring B) Network simulation and visualization C) Network security analysis D) Network troubleshooting

8. In Packet Tracer, which tool can you use to test connectivity between network devices? A) PDU (Protocol Data Unit) Generator B) Packet Analyzer C) Ping D) Traffic Generator

9. What is the primary purpose of the Ping utility? A) Measure network bandwidth B) Test network connectivity C) Analyze network traffic D) Monitor network security