Flashcards
IPT Unit 3
Cards in this deck (61)
- 1What is a communication system?A system enabling users to send/receive data to nodes in a network
- 2Detail the Communications System Framework1. Source
2. Transmitter
3. Switiching & Routing
4. Receiver
5. Destination - 3Function of Source?To produce the data
- 4Function of TransmitterTo encode the data
- 5Function of ReceieverDecodes data back to original form
- 6Function of Destintion?Receives the information
- 73 types of Protocol Levels1. Application Level
2. Communication control and Addressing Level
3. Transmission Level - 8Function of Application Level?Produces the data for transmission & reorganising the data once it has been received by Destination
- 9Function of Communication Control and Addressing Level?To establish and maintain the commnication link.
Sends data to transmission - 10Function of Transmission Level?Defines how, and peforms the actual physical transfer of data along transmission mediums, i.e., a channel
- 11Pneumonic for the 8 functions performed between Source - Destination?MOST - SAES
- 12MMessage Creation
- 13OOrganisation of data pakcets
- 14SSignal generation by transmitter
- 15TTransmission
- 16SSynchronising the transfer
- 17AAddressing and routing (used in IP)
- 18EError detection and correction
- 19SSecurity and Management
- 20What is Handshaking?Agreeing upon a common protocol to utilise during transmission
- 21What is FLOW CONTROL?They are commands that inform the other nodes that the sender & receiver are ready.
- 22What is E-mail?The transfer of ASCII text over the internet.
(the email address of the receiver is analysed with a domain name server (DNS) to find the IP address of the destination mail transfer agent) - 23What is VOIP?Voice-over Internet Protocol!
Transfers voice calls over the internet. Mainly using a BROADBAND connection - 24Forms of wired transmission media?Twister Pair
Coaxial Cable
Optic Fibres - 25Describe Twister Pair?Copper wires intertwined, insulated by plastic.
Used in LANs, ADSL.
10 - 100MBps - 26Describe Coaxial Cable?Transmits analgoue broadcast TV from antennas to TV sets.
Also, used in Broadband connections. - 27Describe Optic Fibres?A transparent, flexible fibre made up of extruded glass to transmitt light to the ends of the fiber.
- 28Forms of Wireless transmission media?Microwaves, Satellites, Radio & Infrared
- 29Describe Microwaves?Used by satellites. Ground to ground level, provides large bandwidth of high frequencies.
* needs direct line of sight - 30Describe SatellitesSatellites use microwaves to transmit data inbetween stations/other satellites. Transponders receive signals on one frequency, ampify it, then transmit on another frequency.
- 31Describe RadioUsed within mobile phones and LANs.
Low-speed transfer rates - 32Describe infraredUsed between portable devices for remote controls.
- 333 characteristics of Speed?1. Bits per second (Bps)
2. Baud Rate (# signal events p/s)
3. Bandwidth (wide band of frequencies for transmission) - 34Protocols used at APPLICATION level?1. HTTP
2. SMTP
3. SSL - 35HTTP?Hypertext transfer protocol.
The web browser receving web pages from the web server. HTML dictates how it'll be displayed - 36SMTP?Simple Mail Transfer Protocol
Uses SMTP servers to relay the message off unto other STMP servers until the message reaches its final destination. - 37SSL?Secure Sockets Layer
Uses 2 keys to encrypt/decrypt data for transmission over the internet - 38Protocols used at COMMUNICATION CONTROL AND ADDRESSING level?Transmission Control Protocol (TCP)
&
Internet Protocol (IP) - 39IP???Addresses the message...moves data packets...uses IP address to reroute message to most efficient path.
- 40TCP??Ensures data is delivered correctly.
Performs data error and correction.
Requires IP - 41Protocols used at TRANSMISSION level?Ethernet (built into hardware/NICs)
Token ring (a special bit pattern traveling around nodes comprising a LAN topology) - 42Causes of data errorElectric, magnetic, thermal interference
- 43What is Parity check?The last bit in a byte maintains an even or odd count of 1's
- 44What is Checksum?A sum is sent in the last byte in a block of data.
Receiver compares sum to the sender's sum - 45What is CRC?Cylic Redundancy Check.
Using calcuations, a number is derived from the data. By recalculation the CRC, errors can be detected and corrected. - 46What is a Network Topology?A description of the layout of a network, including how the nodes interact with each other.
- 47Star topology?
- 48Bus topology?
- 49Ring topology?
- 50What is a HUB?Amplifies and retransmits data packets to attached nodes.
- 51What is a SWITCH?Determines the MAC address of the sender/receiver and connects them.
- 52What is a ROUTER?Uses IP addresses to send messages
- 53What is a MODEM?Modulates the data to analogue form, then demodulates back to digital form.
- 54What is a BRIDGE?Separates different sections of the network into seperate segments
- 55What is a GATEWAY?Connects seperate segments together that use different protocols
- 56What are NICs?Network Interface Cards
Connect data between computer into a form suitable for transmission across the network - 57What are WAPs?Wireless-access points
Central nodes on WLANs that transmit data to the other nodes. - 58Characteristic of a BLUETOOTH deviceShort-range and low-bandwidth
- 59Pneumonic for the Characteristics of Network Operating Software (NOS)FASSC
- 60What does "FASSC" stand for?File management
Administration
Security
Sharing resources
Cross-platform access - 61Characteristics of analgoue & digital signals?Analogue uses replicated sound waves/pictures
Digital is in binary code.
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- IPT Flashcards on IPT Unit 3, created by jp.rogers on 22/09/2013.
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