Networking Flashcards
What is network communication?
Communication over a transmission either through wired media or wireless
What is router?
-provide data routing
-contains account information and connect to Internet Service Provider.
What is switch?
-connect many computers in LAN to the network’s server
- forwards data between LAN and MAC address
What is NIC?
A device that allows computer to translate data received from a network
What is Firewall?
A software that checks incoming data and block dangerous data from entering your network
What is modem?
connects to phone line to modulate and demodulate transmission between analogue and digital
What is WAP?
Access point where wireless signals are sent out and received
What is a bridge?
Connect networks together
What is Gateway?
A location where internet links with a network
What is repeater?
Receives and amplify signal before sending it out again
Analogue vs Digital
Analogue
- Smooth wave pattern
- Low signal-to-noise ratio
-Source varies
Digital
- block wave pattern
- High signal-to-noise ratio
-Generated from electronic devices
What is demodulation?
Process of conversion of analogue to digital
What is modulation?
Process of conversion of digital to analogue
What is the largest WAN?
Internet
What is Protocol?
A set of rules
What is Network Protocol?
Standards made of rules for communication between devices over network
Flow of transmission data using http protocol.
- URL typed after http
- http clients send requests to http server
- http server packs up resources of URL and send back to http client
- http close the connection
http vs https
http
-unsecure
-no encryption
-no ssl certificate
-faster speed
-Application Layer
https
-secure
-encryption
-ssl certificate
-slower speed
-Application and Transport layer
Examples of email protocol.
-POP3
-IMAP
-SMTP
SMTP vs POP3 vs IMAP
SMTP
-Delivers email only
- client upload only
POP3
-simple
-download only
IMAP
-simple
-stores mail on server
-allow simultaneous access
-require more space
Two types of transmission media
Guided and unguided
Three examples of guided media
fibre optics, twisted pair and coaxial
Coaxial vs Twisted pair vs Fibre Optics
Coaxial
-braided metal
-prevent cross-talk and signal interference
-Expensive
-High frequency
-distance<=500m
Twisted pairs
- Two insulated copper twisted together
-LAN
-Cost-effective
-100m maximum range
reduces cross-talk and signal interference
Fibre optics
-contains strands of grass fibre
-long distance
-prevent cross-talk and signal interference
-telecommunications
-single mode: travel >500m, low bandwidth
-multi mode: travel <500m, high bandwidth
