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Computer Networks, Connections and Protocols

Network hardware, DNS, hosting and the cloud

  • 3 things to know
  • J277/01

Overview

NICs, switches, routers and wireless access points, transmission media, the internet, how DNS turns a URL into an IP address, web hosting, and the cloud.

What you need to know

Answer each one before you reveal it.

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Key term

What does a router do, and what does a home router connect together?

Key term

Describe how DNS is used when a URL is typed into a web browser.

Key term

What is the job of a NIC?

Questions from this subtopic

Each one with the model answer underneath.

  1. 1

    What is the job of a NIC?

    Model answer

    A NIC (Network Interface Controller) is the hardware that lets a device connect to a network. The NIC sends and receives data and holds the device's MAC address.

  2. 2

    What does a switch do in a LAN?

    Model answer

    A switch connects the devices within a LAN. A switch receives data and sends it only to the device it is addressed to, using MAC addresses.

  3. 3

    Why is a switch more efficient than sending every message to every device?

    Model answer

    A switch forwards data only to the intended device, so other links are not filled with unwanted traffic. Less unnecessary traffic means fewer collisions and faster transfers.

  4. 4

    What is the main job of a router?

    Model answer

    A router forwards data packets between different networks. A router reads IP addresses to choose a route towards each packet's destination.

  5. 5

    What does a home router connect together?

    Model answer

    A home router connects the home LAN to the internet. A home router usually contains a switch and a wireless access point in the same box.

  6. 6

    What is a wireless access point (WAP)?

    Model answer

    A wireless access point lets wireless devices join a wired network. A WAP sends and receives radio signals and passes the data on to the wired network.

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