Computer Internet Questions and Answers

Answer: B

Correct answer: network

A network is the combination of hardware - cables, adapters, switches - and software - protocols and drivers - that allows computers to exchange information. A server is one machine on it.

Answer: C

Correct answer: Converts analog signals to digitals and vice-versa

A modem modulates the computer's digital data onto an analogue carrier for transmission and demodulates it back at the other end, which is where its name comes from.

Answer: A

Correct answer: It encrypts traffic and hides the user’s IP address from the sites visited

A VPN, or Virtual Private Network, creates an encrypted tunnel between the user’s device and a server operated by the VPN provider. Traffic emerges from that server, so sites see the server’s IP address rather than the user’s, and anyone observing the local network sees only encrypted traffic to a single destination. Its two established uses are remote access - letting an employee reach an office network as though present - and protecting traffic on untrusted networks such as public Wi-Fi. It generally makes a connection slower rather than faster, since traffic travels further and must be encrypted and decrypted; the second option inverts this. Its privacy protection is also limited and worth stating plainly: it moves trust from the internet provider to the VPN provider, who can see the same traffic. It does not make a user anonymous, since cookies and logins identify them regardless of address.

Answer: C

Correct answer: It is the address of page on World Wide Web

A URL - Uniform Resource Locator - identifies where a resource is and how to fetch it: the scheme, the host and the path.

Answer: D

Correct answer: SMTP

SMTP, the Simple Mail Transfer Protocol, is used to send mail - from a client to its server, and from server to server across the internet. The retrieval protocols are different, and the pair is worth distinguishing. POP3 downloads messages to one device and by default removes them from the server, which suits a single machine. IMAP leaves messages on the server and synchronises state - read, filed, deleted - across every device, which is why it is the standard for anyone reading mail on both a phone and a computer. The mnemonic is that SMTP sends and the others fetch. SMTP was designed without authentication, which is the root of the spam problem; the modern remedies are authenticated submission on port 587 and the sender-verification schemes SPF, DKIM and DMARC. FTP transfers files and has nothing to do with mail.

Answer: D

Correct answer: To allow page headers and footers to appear on document when it is printed

A header or footer is a page feature: what is placed there repeats on every page and is printed with it. That is what distinguishes it from ordinary text typed at the top of the first page.

Answer: C

Correct answer: Tele-conferencing

Teleconferencing is a meeting held between people in different places, connected by voice or video - an electronic meeting. Tele-shopping and tele-banking are transactions rather than meetings.

Answer: C

Correct answer: Copies of previously downloaded page resources, to avoid fetching them again

The cache holds copies of resources already downloaded - images, stylesheets, scripts, sometimes whole pages - so that a return visit can use the local copy instead of fetching it again. The benefit is speed and reduced data use, since the largest parts of a page are usually the ones that change least. Servers control it through HTTP headers giving each resource an expiry time or a validation token, so the browser can ask whether its copy is still current without downloading the whole thing. Its familiar drawback is staleness: a site updated on the server may still show the old version locally, which is why a forced reload - Ctrl + F5 - bypasses the cache. It should not be confused with the neighbouring stores the browser keeps: history lists pages visited, cookies hold site data, and the password manager holds credentials, encrypted rather than in plain text.

Answer: C

Correct answer: IMAP keeps messages on the server while POP3 downloads and usually removes them

Because IMAP leaves the mailbox on the server, the same account looks identical from a phone, a laptop and a browser. POP3 pulls messages down to one machine, which suits a single device but makes synchronisation awkward.

Answer: A

Correct answer: multiplexor

A multiplexor combines several lower-rate streams onto one higher-rate line and separates them again at the far end. A bridge and a router forward traffic rather than combining channels.