Computer Internet Questions and Answers

Answer: C

Correct answer: 255

A piconet has one master and up to seven active slaves, but as many as 255 further devices may be parked - synchronised to the master but not currently exchanging data.

Answer: B

Correct answer: Network

A network is the combination of hardware and software through which computing devices exchange information. A peripheral attaches to one machine and an expansion board sits inside one.

Answer: C

Correct answer: Email

E-mail is the service for sending and receiving messages. FTP transfers files and Gopher was an early document retrieval system, so neither carries mail.

Answer: C

Correct answer: Network Server

The server stores the shared data and runs the shared services, so it is both the most capable machine and the one everything else depends on.

Answer: C

Correct answer: Web browser

Mosaic, released in 1993, was the first widely used graphical web browser and the ancestor of Netscape.

Answer: A

Correct answer: Intranet

An intranet uses internet technologies but is reachable only from inside the organisation. An extranet extends limited access to chosen outsiders, and a VPN carries a private connection over the public internet.

Answer: B

Correct answer: personal area network

Bluetooth is a short-range technology, reaching a few metres, and is defined as a personal area network standard - the space around one person and the devices they carry.

Answer: D

Correct answer: The maximum rate at which data can be transferred

Bandwidth is the maximum rate at which data can be carried, measured in bits per second - Mbps or Gbps. It is a measure of capacity, not of speed in the everyday sense. It should be distinguished from two related quantities that users often conflate with it. Latency is the delay before data begins to arrive, measured in milliseconds; a satellite link may have high bandwidth and terrible latency, which is why it is poor for video calls but fine for downloads. Throughput is the rate actually achieved, which is always less than the bandwidth because of protocol overhead, congestion and retransmission. The analogy usually offered is a pipe: bandwidth is its width, latency is the time for water to travel its length, and throughput is what actually comes out. Note the unit trap: network speeds are quoted in bits per second and file sizes in bytes, so a 100 Mbps link transfers about 12.5 MB per second.

Answer: A

Correct answer: Delivering computing services over the internet rather than from local hardware

Cloud computing delivers computing resources - servers, storage, databases, software - over the internet from a provider’s data centres, rather than from hardware the user owns and maintains. Its three service models are worth knowing. IaaS supplies raw infrastructure, virtual machines and storage, leaving the operating system and everything above to the customer. PaaS supplies a platform on which to run applications without managing the servers. SaaS supplies finished software over the web - Gmail and Google Docs are examples. The deployment models are public, private, hybrid and community. The attraction is that capacity can be added and removed on demand and paid for by use, turning a capital cost into an operating one and removing the need to size hardware for peak load. The concerns are dependence on a provider, the difficulty of moving between them, and the legal question of where data physically resides.

Answer: A

Correct answer: Wireless network

Wi-Fi is the trade name for wireless local networking over the IEEE 802.11 standards. The name suggests wireless fidelity but was coined as a brand rather than as an abbreviation.