Computer Network Questions and Answers

Answer: C

The toolkit for building grids is the Globus toolkit.

The Globus Toolkit is open-source software for grid computing. It provides the services needed to share computing power and data across institutions: security, resource management, data transfer (GridFTP) and information services.

Apache Hadoop is a framework for distributed storage and processing of big data on clusters. Microsoft Azure is a commercial cloud computing platform. Microsoft Word is a word processor. None of them is a grid-building toolkit.

Answer: B

Computers communicate on the internet through TCP/IP.

TCP/IP is the protocol suite on which the internet runs. IP (Internet Protocol) gives every device an address and routes packets between networks, and TCP (Transmission Control Protocol) breaks data into packets and delivers them reliably and in order.

IP alone is only one layer of that suite. HTTPS is one application protocol, for secure web pages, and a web browser is a program that uses these protocols, not the means of communication itself.

Answer: C

The key's answer is a 32-bit number.

An IPv4 address, the classic internet address, is 32 bits long. It is written as four 8-bit numbers in dotted decimal form, such as 192.168.1.1, giving about 4.3 billion possible addresses.

8 and 16 bits are far too small; 8 bits is just one part of the dotted address. The newer IPv6 addresses are 128 bits long, but the question refers to the familiar IPv4 address.

Answer: B

SMTP is used for Email.

The Simple Mail Transfer Protocol carries e-mail from a mail client to its server and between mail servers, usually on port 25 (or 587 for submission). Messages are then read with POP3 or IMAP.

Secure connections are made with TLS or VPNs, files are transferred with FTP, and websites are served with HTTP or HTTPS.

Answer: C

FTP is used for File transfer.

The File Transfer Protocol moves files between a client and a server, using port 21 for commands and a separate connection for the data. It is used, for example, to upload website files to a host.

E-mail uses SMTP, web pages use HTTP or HTTPS, and plain FTP is not even secure, since it sends passwords unencrypted; SFTP or FTPS add security.

Answer: C

The device is a Router.

A router connects a computer, or a whole local network, to other networks such as the internet, forwarding data packets towards their destination.

A scanner is an input device and a printer an output device, and RAM is memory inside the computer; none of them connects it to a network.

Answer: A

Correct answer: in-service expansion

A token bus passes the token logically, by address, rather than physically round a cable, so a station can be added to or removed from the logical ring while the network keeps running. The number of stations and the span are both limited by the medium.

Answer: A

Correct answer: Unshielded Twisted pair

UTP is Unshielded Twisted Pair - pairs of wires twisted together to cancel interference, with no metal screen around them. Shielding gives STP.

Answer: C

Correct answer: the hubs

SNMP management is put where the traffic converges, so the agent is fitted to the hub, which sees every port on its segment. Putting it on a single node or PC would show only that machine's view.

Answer: B

Correct answer: Entropy

Entropy measures the average uncertainty of a source: the more evenly spread its symbol probabilities, the more information each symbol carries. Bandwidth measures the channel, not the source.