Checkpoint 211: Internet anatomy

The primary role of routers on the Internet is to

• direct data packets between networks.

• connect devices within a LAN.

• store website data.

• convert digital data into analog signals.

Answer explanation

The primary role of routers on the Internet is to direct data packets between networks. They determine the best path for data to travel, ensuring efficient communication across different networks.

A Local Area Network (LAN) is a network

• that connects multiple WANs.

• that only connects wireless devices.

• connecting devices within a limited area.

• connecting devices over a large geographical area.

Answer explanation

A Local Area Network (LAN) is defined as a network connecting devices within a limited area, such as a home, office, or campus. This distinguishes it from WANs, which cover larger geographical areas.

Modems

• direct data packets between networks.

• store and manage website data.

• connect devices within a LAN.

• convert digital data into analog signals for transmission.

Answer explanation

A modem's primary function is to convert digital data from a computer into analog signals for transmission over telephone lines, and vice versa. This allows for internet connectivity, making the correct choice 'To convert digital data into analog signals for transmission'.

The Internet backbone primarily composed of

• wireless routers and switches.

• Local Area Networks (LANs).

• modems and ISPs.

• high-capacity fibre-optic cables and routers.

Answer explanation

The internet backbone is primarily composed of high-capacity fibre-optic cables and routers, which facilitate fast and efficient data transmission across long distances, unlike the other options that serve different roles.

The device that connects a LAN to a WAN is a

• router.

• data centre.

• modem.

• switch.

Answer explanation

A router connects a Local Area Network (LAN) to a Wide Area Network (WAN) by directing data packets between them, making it the correct choice. Other options like modems and switches serve different functions.

What role do ISPs play in internet connectivity?

• They connect devices within a LAN.

• They convert digital data into analog signals.

• They provide access to the internet.

• They store and manage website data.

Answer explanation

ISPs (Internet Service Providers) are essential for internet connectivity as they provide access to the internet, allowing users to connect their devices to the global network. Other options do not accurately describe their primary function.

Wide Area Networks (WANs)

• only connects wireless devices.

• span a large geographical area.

• are used exclusively for home networks.

• connect devices within a single building.

Answer explanation

A key characteristic of a Wide Area Network (WAN) is that it spans a large geographical area, connecting multiple locations over distances that can range from cities to countries, unlike local networks which are confined to smaller areas.

The primary purpose of data centres in internet infrastructure is to

• convert digital data into analog signals.

• store and manage website and application data.

• connect devices within a LAN.

• direct data packets between networks.

Answer explanation

The primary purpose of data centres is to store and manage website and application data, providing the necessary infrastructure for hosting services and ensuring data accessibility and security.

Routers handle network congestion by

• storing data temporarily.

• redirecting data along alternative paths.

• converting data into analog signals.

• connecting devices within a LAN.

Answer explanation

Routers manage network congestion primarily by redirecting data along alternative paths. This helps to balance the load and prevent bottlenecks, ensuring efficient data transmission across the network.

What happens when you enter a URL in your browser?

• The URL is converted into an analog signal.

• The browser stores the website data locally.

• A data request is generated and travels through the internet infrastructure.

• The browser directly accesses the website server.

Answer explanation

When you enter a URL, a data request is generated and travels through the internet infrastructure to reach the server hosting the website, allowing your browser to retrieve and display the requested content.