AMCAT Networking and Web Technologies 3

Question 1

What is the difference between symmetric and asymmetric encryption?

Accepted Answer

Symmetric encryption uses one shared key for both encryption and decryption; asymmetric uses a public-private key pair

Answer

Symmetric encryption uses the same secret key for both encryption and decryption (e.g., AES). Asymmetric encryption uses a pair of mathematically related keys: a public key for encryption and a private key for decryption (e.g., RSA). In practice, HTTPS uses asymmetric encryption to exchange a symmetric key, then uses symmetric encryption for the session.

Question 2

In HTML5, what is the purpose of the <canvas> element?

Accepted Answer

To create a drawing surface for rendering 2D graphics dynamically using JavaScript

Answer

The HTML5 <canvas> element provides a drawable region in a web page where JavaScript can render 2D graphics, animations, charts, and even simple games dynamically. Unlike SVG which uses DOM elements, canvas draws pixels directly to a bitmap surface.

Question 3

What is the purpose of the ARP (Address Resolution Protocol)?

Accepted Answer

To convert IP addresses to MAC addresses on a local network

Answer

ARP resolves IP addresses (logical, Layer 3) to MAC addresses (physical, Layer 2) within a local network. When a device knows the destination IP but needs the MAC address to send a frame on the local network, it broadcasts an ARP request, and the device with that IP responds with its MAC address.

Question 4

Which of the following best describes a RESTful API?

Accepted Answer

An architectural style that uses standard HTTP methods, is stateless, and represents resources through URIs

Answer

REST (Representational State Transfer) is an architectural style for designing networked applications. Key principles include: using standard HTTP methods (GET, POST, PUT, DELETE), statelessness (each request contains all needed information), resource identification through URIs, and representation of resources in formats like JSON or XML.

Question 5

What is the maximum number of usable host addresses in a /24 subnet?

Accepted Answer

254

Answer

A /24 subnet has 8 host bits, giving 2^8 = 256 total addresses. However, two are reserved: the network address (all host bits = 0) and the broadcast address (all host bits = 1). Therefore, 256 - 2 = 254 usable host addresses.

AMCAT Practice Test

AMCAT Practice Test

AMCAT Networking and Web Technologies 3