AMCAT Networking and Web Technologies 2

Question 1

What is the purpose of a subnet mask in IP networking?

Accepted Answer

To divide an IP address into network and host portions, determining which addresses are on the same local network

Answer

A subnet mask works with an IP address to identify which portion represents the network and which represents the host. When two devices have the same network portion (after applying the subnet mask), they are on the same local network and can communicate directly without a router.

Question 2

Which of the following is a key feature of WebSocket protocol compared to HTTP?

Accepted Answer

WebSocket establishes a persistent, full-duplex communication channel between client and server

Answer

WebSocket provides full-duplex communication over a single TCP connection, allowing both client and server to send messages independently at any time. Unlike HTTP's request-response model, WebSocket keeps the connection open, making it ideal for real-time applications like chat and live updates.

Question 3

What does CORS (Cross-Origin Resource Sharing) allow in web development?

Accepted Answer

It allows servers to specify which origins are permitted to access their resources, relaxing the same-origin policy

Answer

CORS is a mechanism that uses HTTP headers (like Access-Control-Allow-Origin) to allow servers to declare which origins (domains) are permitted to access their resources. It provides a controlled way to relax the same-origin policy when cross-origin access is legitimately needed.

Question 4

In the TCP three-way handshake, what is the correct sequence of messages?

Accepted Answer

SYN → SYN-ACK → ACK

Answer

The TCP three-way handshake establishes a connection in three steps: (1) Client sends SYN to the server, (2) Server responds with SYN-ACK acknowledging the client's request and sending its own synchronization, (3) Client sends ACK confirming the server's response. The connection is now established.

Question 5

What is the primary function of a CDN (Content Delivery Network)?

Accepted Answer

To distribute content across geographically dispersed servers to reduce latency and improve load times for users

Answer

A CDN caches content (static files, images, scripts) on servers distributed across multiple geographic locations (edge servers). When a user requests content, it is served from the nearest edge server rather than the origin server, significantly reducing latency and improving performance.

AMCAT Practice Test

AMCAT Practice Test

AMCAT Networking and Web Technologies 2