topic 2 - communication and internet tech

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Total cards: 21•Content version: v4•Public deck•Updated: 8/1/2026

Card preview (21)

Front (Question)

data transmission types (5)

Back (Answer)

• simplex • duplex • half-duplex • full-duplex • serial • parallel

Front (Question)

simplex

Back (Answer)

data transmitted one way only

Front (Question)

duplex

Back (Answer)

data transmitted in both way

Front (Question)

half-duplex

Back (Answer)

data transmitted in both ways but not at the same time

Front (Question)

full-duplex

Back (Answer)

data transmitted in both ways at the same time

Front (Question)

serial(2)

Back (Answer)

• one bit sent at a time over a single wire (eg. computer to printer) • used to send data externally between devices

Front (Question)

parallel (2)

Back (Answer)

• multiple bits sent at the same time using multiple wires - used to send data internally

Front (Question)

why use serial instead of parallel when connecting device to PC

Back (Answer)

• single wire reduces the cost • single wire means less chance of corruption • more reliable over time bits still synchronised after transmission

Front (Question)

asynchronous transmission (2)

Back (Answer)

• Data is sent in form of byte or character - time interval of transmission is random

#10

Front (Question)

synchronous transmission (2)

Back (Answer)

• Data is sent in form of blocks or frames - time interval of transmission is constant

#11

Front (Question)

USB (7)

Back (Answer)

• universal serial bus • data transmission method • uses serial transmission • device automatically detected • only fits one way; it cant fit incorrectly • industry-standard • backwards-incompatible

#12

Front (Question)

methods of error-checking (4)

Back (Answer)

• parity check • checksum • ARQ; automatic repeat request • check digit

#13

Front (Question)

how does parity check work (5)

Back (Answer)

• checks byte of data • a parity bit is added • counts num of 1s • can be odd or even • if parity incorrect, error is detected

#14

Front (Question)

when will parity check not work (2)

Back (Answer)

• multiple errors in same byte • ## 2 bits interchanged

#15

Front (Question)

how does ARQ (automatic repeat request) work (6)

Back (Answer)

• uses acknowledgement • check performed on receiving data • if error detected request sent to respond data • resend request repeated until data sent correctly • send an acknowledgement that data is received • if acknowledgement not received in set time data is resent

#16

Front (Question)

checksum (4)

Back (Answer)

• values calculated from the data • it is transmitted with the data • value recalculated after transmission • values compared after transmission to check for error

#17

Front (Question)

what is an IP address

Back (Answer)

location of a device on a network

#18

Front (Question)

what is a MAC address

Back (Answer)

number that uniquely identifies a device

#19

Front (Question)

what does https

Back (Answer)

hypertext transfer protocol secure

#20

Front (Question)

describe what browsers do (3)

Back (Answer)

• interprets HTML • URL entered into browser HTTP protocol used

#21

Front (Question)

requesting web pages

Back (Answer)

• request - web browser used - url entered into browser - http protocol used • sent - url contains domain name - domain name used to locate IP address - DNS server stores index of IP address and domain names - web browser sends request to web server • received - data stored on wbeserver - web server sends data to browser - browser translate html