Flashcards
Unit 5
Flashcards do conjunto (30)
- 1bigger concern when computers are networked,since one compromised computer can damage the rest of the networkin the event of a disaster(data loss, destruction of equipment), operations can be recovered by restoring from backups, or even relocating to an entirely new site.
- 2group of computers connected so they communicateNetworks require costly maintenance- hardware can develop faults, new devices need adding
- 3Working with people in different countries is possible with VPNs and other collaboration toolsCost of setting up the network is high, but benefits of networking outweigh those costs overtime
- 4user accounts,printers,internet and files can be shared between computers,enabling users to have the same experience whichever computer they useLow chance of collisions, low chance of failure.requires hub/switch.
- 5Data which is no longer in regular use can be moved to a remote server, freeing up spaceUsed by the internet. Almost impossible to break.Requires routing.
- 6old,not widely used.Prone to failure,collisions and slowdownencoding data either symmetrically or asymmetrically in order to prevent access to the information
- 7The IP address of the device the packet is being sent toA method of grouping data into fixed or variable length packets,to be sent across a network
- 8Information that allows the data to be reassembledThe IP address of the device the packet is being sent to
- 9-Networks search for a lower cost path, the shortest path with fates nodes -lowest cost path will change regularly as nodes become more or less busy -packets are sent along the lowest cost route independently, potentially arriving out of orderChecks if data is corrupted
- 10Copies each packet to every device on the networkAnalyses each packet and sends it to the appropriate device
- 11joins two networks that use the same base protocolStores addresses of devices on the network, and transfers data to and from other networks
- 12Allows other Wi-Fi devices to connect to a networkJoins two networks that use the same base protocol
- 13automatically made to remote servers,even in different countries,Allows a device to connect to a network(wired or wireless)
- 14The protocol used for wired communicationA set of rules governing how communication takes place. Both computers must use the same protocol for communication to be successful.
- 15short range,low power connectionA suite of protocols for wireless communication, including:
bluetooth,801.11 - 16used for assembling packets (datagrams)longer range, faster,used fore wireless networks
- 17allows webpages to be shared across different computers and browsersused for addressing and routing of packet
over the network - 18used to transfer email between servers and sending email applicationworks together with SSL (secure sockets layer) to transfer data securely
- 19-IP addresses are used to identify devices on a network -IP addresses are in 4-byte format, 0.0.0.0-255.255.255.255 -DNS servers continually update from other DNS serversused for sending files across the internet
- 20—Host layer Data
high-level APIs, including resource sharing
, remote file access e.g HTTP - 21host layer data Managing communication sessions, so the exchange of information as transmission between 2 nodes e.g full and half duplex as well as simplex operationhost layer Data
Translation of data between a networking service and an application.This would include character encoding, data compression and encryption e.g ASCLL or EBCDIC conversion - 22Media layer Packet structuring and managing a multi-node network including addressing routing and traffic control e.g IPHost layer Segment ,datagram
Reliable transmission of data segments between point on a network including segmentation, acknowledgment and multiplexing e.g TCP and UDP - 23Media Layer symbol transmission and reception of a raw bit of streams over a physical medium e.g bluetooth, ethernet, USBmedia layer frame
- 24Fraud where an internet user is tricked(an email message is common)into revealing personal or confidential information. example:bank details which can then be used fraudulentlyShorts for malicious software, malware is a broad-spectrum term used to disrupt computer operation
- 25Attempting to penetrate a systems security layer in order to demonstrate security risksPhychological manipulation of people into revealing personal or confidential information
- 26Assigning different levels of system access to user depending on their role.repeatedly trying combinations of characters in usernames and passwords in order to gain access to a computer system.
- 27monitoring and analysis of network traffic to detect intrusion.prevention of access to systems usually by repeatedly sending use amounts of messages asking a network to authenticate a request that has no valid return address.
- 28presents access unless two or more pieces of evidence are successfully given to the system example: at an ATM the card and the PINunauthorised taking or interception of computer-based information
- 29network security system that monitors incoming and outgoing traffic based on pre-determined rulesExploits poor security by adding SQL statements into data entry fields that destroy or copy data
- 30encoding data either symmetrically or asymmetrically in order to prevent access to the information
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- GCSE Computing FlashCards sobre Unit 5 , criado por Paige Cosstick em 04-01-2022.
- Criado por
- Paige Cosstick
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