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Flashcards do conjunto (31)
- 1What is a computer network?A series of computers connected together.
- 2Describe a LANA LAN is a Local Area Network over a small geographical area e.g. a school network
- 3Describe a WANA WAN is a Wide Area Network over a large geographical area. The World Wide Web is a WAN we use on a daily basis.
- 4What are the advantages of a computer network?Resource sharing, cost efficient.
- 5What are the disadvantages of a computer network?Files can be intercepted, security problems.
- 6What devices are needed to produce a LAN?A broadband connection, a router,
a modem (if there isn't one built in to your router). - 7What is the purpose of a NIC?A Network Interface Card is used to allow a computer to connect to a network. It is usually a circuit board.
- 8What is the purpose of a Router?A router is a switching device for networks, which is able to route network packets, based on their addresses, to other networks or devices.
- 9What is the purpose of a Hub?Hubs are devices commonly used to connect segments of a LAN. The hub contains multiple ports.
- 10What is the purpose of a Switch?A switch can be used to connect multiple hosts (PCs) to the network. Unlike a hub, a switch forwards a message to a specific host.
- 11What is the purpose of a WAP?A Wireless Access Point is a networking hardware device that allows other Wi-Fi devices to connect to a wired network.
- 12What is the purpose of a web browser?A web browser, or simply "browser," is an application used to access and view websites.
- 13What is the difference between a Hub and a Switch?A hub connects things physically whereas a switch connects things through data links.
- 14What is the Internet?The internet is a global network of networks.
- 15What is the World Wide Web?The World Wide Web is the part of the Internet that contains websites and web pages.
- 16What is the purpose of an ISP?An Internet Service Provider is a company (BT e.t.c.) that provides Internet access to companies, families, and even mobile users.
- 17What is an IP address?An Internet Protocol address is a set of logical numbers which computers use to locate different websites.
- 18What is a URL?A Uniform Resource Locator is a set of words used by humans as it is easier to remember.
- 19How is a URL constructed?A URL is constructed using a protocol, a domain name and a path.
- 20Explain the role of the DNS.The Domain Name Service switches the URL typed by humans Into an IP address so that the computers can understand.
- 21What are the three different network topologies?The three different network topologies are Bus Topology, Ring Topology and Star Topology.
- 22What are the advantages of a Star topology?Advantages:
It is very reliable - if one cable or device fails then all the others will continue to work
It is fast and efficient as not data collisions can occur - 23What are the disadvantages of a Star topology?Disadvantages:
It is expensive to install
Extra hardware is required
If a hub/switch fails then all the devices connected to it will have no connection - 24What are the advantages of a Ring topology?Advantages:
Fast - no data collisions
Cheap - no additional hardware needed - 25What are the disadvantages of a Ring topology?Disadvantages:
Unreliable - if one computer goes down, it affects all others on the ring - 26What are the advantages of a Bus topology?Advantages:
Easy installation
Cheap - single cable
Easy to add / remove devices - 27What are the disadvantages of a Bus topology?Disadvantages:
Unreliable
Slow speed - increased traffic
Security - risk of interception - 28List examples of data that need to be kept secure.Files
- 29What is a Pigpen Cipher?The pigpen cipher is a geometric simple substitution cipher, which exchanges letters for symbols which are fragments of a grid.
- 30What is encryption?Encryption is turning plain text into cipher text, making harder for people to access to data
- 31What is decryption?Decryption is when you use a key to decipher cipher text and read it as plain text.
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- FlashCards sobre Sem título, criado por Rohan Jamili em 09-03-2020.
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- Rohan Jamili
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