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KwickClips Networks and the Internet

Networks and the Internet: 62 short revision clips

One idea per clip, with the answer written out underneath. Each clip links back to the full Networks and the Internet lesson it came from.

Three uses of a network: share files, share one printer, chat and video call.What is a computer network?42 secAn Internet timeline table: 1969 ARPANET, 1986 NSFNET, 1995 India online.What was ARPANET?43 secA two-column table pairing network gains with matching risks.Is a network always good?41 secA table comparing client server and peer to peer on server, security and example.What is the difference between a client and a server?43 secA list of the five data communication components with a phone-to-phone photo example.What are the five components?43 secA table comparing bandwidth as capacity with data transfer rate as actual speed.Is bandwidth the same as speed?39 secA table of simplex, half duplex and full duplex modes with keyboard, walkie-talkie and phone call examples.Is a walkie-talkie full duplex?42 secA table comparing serial and parallel transmission on bits at a time, distance and cost.Which transmission suits long distances?41 secA table of twisted pair, coaxial and fibre optic cables with what each carries and where it is used.Which cable is the fastest?43 secA table of radio, microwave and infrared with range and one example each.Why must you point the remote at the TV?40 secA table comparing Bluetooth and Wi-Fi on range, speed and typical use.Do Bluetooth and Wi-Fi use the same kind of signal?44 secA matching table of three situations to fibre optic, twisted pair and Bluetooth.Which medium links two cities at high speed?43 secA zoom-out table from person to building, city and world for PAN, LAN, MAN and WAN.Which network covers one building?45 secA table of PAN, LAN, MAN and WAN against relative speed and who owns each.Why is a LAN usually the fastest?47 secA matching table of earbuds to PAN, school lab to LAN, city cable TV to MAN and the Internet to WAN.Which network is a city cable TV service?45 secThree points describing the Internet as a network of networks with billions of devices and no single owner.Who owns the Internet?43 secA table of the five topologies: bus one cable, star central hub, ring closed circle, tree branches, mesh web.What is a topology?43 secA table of link failures: bus backbone stops all, star loses one node, ring stops, mesh finds a new path.Which topology survives a broken link best?43 secA table of each topology's main advantage beside its main drawback.Which topology uses the least cable?42 secA matching table of school lab to star, many floors to tree, and never-stop bank to mesh.Which topology suits a school computer lab?41 secA table with the modem converting signals and the NIC connecting a computer to a network.What two words make up modem?42 secA table comparing hub and switch on where data is sent, whether MAC is learnt, and speed.Which device sends data to all ports?40 secA table of repeater boosting, router joining networks and gateway translating protocols.Which address does a router read?43 secA table of the RJ-45 plug with 8 pins, the 48-bit MAC address and a Wi-Fi card as a wireless NIC.How many pins does an RJ-45 plug have?42 secThree points a protocol fixes: data format, message order, and error handling.What is a protocol?41 secA table splitting the work: TCP makes and checks packets, IP addresses and routes them.Which one makes the packets?45 secA table matching HTTP, HTTPS, FTP, SMTP and POP3 to their jobs.Which protocol sends email?54 secA table of PPP for two nodes, Telnet for remote login and VoIP for Internet calls.Is Telnet safe to use?45 secThe four TCP/IP layers with example protocols at each level.How many layers does the TCP/IP model have?44 secThree reasons for packets: shared lines, resend only what is lost, avoid broken routes.Does a video travel as one piece?41 secA packet diagram labelled header with IPs and number, payload with the data, and trailer with an error check.What are the three parts of a packet?40 secThree packets taking three different router paths and being reordered at the destination.Why do packets take different routes?36 secA table comparing packet and circuit switching on path, arrival order and example.Which method reserves a path before sending?41 secThree causes of transmission errors: interference, weak signal over distance, and bits lost or changed.What is interference?40 secAn even parity byte with five 1s flagged as an error, and a parity block locating a bad bit.With even parity, is a byte with five 1s correct?42 secA table with checksum recalculated and compared beside echo check sending data back.What is a checksum?37 secA table with ARQ resending after a timeout beside a check digit catching typing errors.What is an acknowledgement?39 secA two-column comparison: the network and its hardware against linked pages and hyperlinks.Which one is the hardware?40 secA URL broken into protocol, domain name, and path with file name.What does URL stand for?39 secA DNS lookup flow: browser asks a DNS server, receives the IP address, then opens the site.What does DNS do?41 secA table comparing IPv4 and IPv6 on bits, parts and separators, with one example each.How many bits does an IPv4 address have?43 secA table of four Internet services: email, chat, VoIP and search, with one example each.Is the Internet only websites?40 secA two-column comparison: one document with one URL against many pages under one domain.What is a website?40 secA table comparing static and dynamic pages on content and whether all visitors see the same page.Is a result page static or dynamic?39 secA table with a web server storing and sending pages beside web hosting as renting space.What is a web server?38 secA flow from DNS lookup to HTTP request to server response and the browser showing the page.What is the first step after you type a URL?40 secThree points on what a browser does, with Chrome and Firefox named as examples.What does a browser do?41 secThree points on browsers and settings, with a note that incognito only skips local history.Does incognito mode make you invisible?40 sec
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