Computer Networks Quiz 2

Which one of the following monitors incoming network traffic to prevent unauthorized attacks?

• Data guard.

• Firewall.

• Fireguard.

• Data shield.

Answer explanation

A Firewall is a network security device that monitors and filters incoming and outgoing network traffic based on an organization's previously established security policies. At its most basic, a firewall is essentially the barrier that sits between a private internal network and the public Internet.

Which one of the following government services would most likely be provided over the Internet?

• Waste Collection.

• Online Tax enquiries.

• Prison Service.

• Marriage Registration.

Answer explanation

Digital government services (also called e-government) are defined as service delivery within government — as well as between government and the public — using information and communication technologies. Common digital services range from filling tax returns to renewing a driver's license to applying for a pet license.

Which one of the following is commonly used to connect computers in the Zambian and Namibian offices of a multinational company?

• The World Wide Web.

• A local area network.

• A wide area network.

• A wireless local area network.

Answer explanation

A wide area network (also known as WAN), is a large network of information that is not tied to a single location. WANs can facilitate communication, the sharing of information and much more between devices from around the world through a WAN provider.

WANs can be vital for international businesses, but they are also essential for everyday use, as the internet is considered the largest WAN in the world.

Which one of the following terms commonly refers to a network where one computer provides shared resources to other computers?

• Client / Giver.

• Client / User.

• Client / Server.

• Server / Provider.

Answer explanation

Client-server networks are computer networks that use a dedicated computer (server) to store data, manage/provide resources and control user access. The server acts as a central point on the network upon which the other computers connect to. A computer that connects to the server is called a client.

Which one of the following commonly describes an Intranet?

• a network of a maximum of 3 computers.

• a private company network.

• only used in the home.

• a worldwide network of computers.

Answer explanation

An intranet can be defined as a private network used by an organization. Its primary purpose is to help employees securely communicate with each other, to store information, and to help collaborate. Modern intranets use social intranet features that allow employees to create profiles and to submit, like, comment, and share posts.

________ is a device used to connect multiple devices on a single (typically wired) network; forwards data to only the intended recipient.

Answer explanation

A network switch connects devices within a network (often a local area network, or LAN*) and forwards data packets to and from those devices.

_________ is a device used to connect multiple networks to each other; forwards data to only the intended recipient.

Answer explanation

A router is a device that connects two or more packet-switched networks or subnetworks. It serves two primary functions: managing traffic between these networks by forwarding data packets to their intended IP addresses, and allowing multiple devices to use the same Internet connection.

A __________ is a physical location where people can access the Internet, typically using Wi-Fi, via a wireless local area network (WLAN) with a router connected to an Internet service provider.

Answer explanation

Hotspot: A hotspot is a physical location where people can access the Internet, typically using Wi-Fi, via a wireless local area network (WLAN) with a router connected to an Internet service provider. Most people refer to these locations as “Wi-Fi hotspots” or “Wi-Fi connections.” Simply put, hotspots are the physical places where users can wirelessly connect their mobile devices, such as smartphones and tablets, to the Internet.

The following technologies are wireless except ___________.

• Bluetooth

• Wi-Fi

• Fiber Optic

• Infrared

Answer explanation

Fiber optics, or optical fiber, refers to the technology that transmits information as light pulses along a glass or plastic fiber.

A fiber optic cable can contain a varying number of these glass fibers -- from a few up to a couple hundred. Another glass layer, called cladding, surrounds the glass fiber core. The buffer tube layer protects the cladding, and a jacket layer acts as the final protective layer for the individual strand.

The device used in a data communication network to perform the conversion between analogue and digital signals, is called a ________.

• Switch.

• Modem.

• Decoder.

• Node.

Answer explanation

Modem, (from “modulator/demodulator”), any of a class of electronic devices that convert digital data signals into modulated analog signals suitable for transmission over analog telecommunications circuits.