1.3.2 Flashcards
modes of connection
-wired connection
-wireless connection
what is wired connection?
connected with physicals
examples of wired connection
ethernet
what is wireless connection?
connected using wireless technology
examples of wireless connection
Wi-Fi and Bluetooth
what is ethernet?
family of networking rules or protocols used in LANs
benefits of ethernet
-higher bandwidth which allows transmission of lots of data
-avoids data collisions and has less interference
-difficult for unauthorised users to intercept data
-secure, stable and reliable connections
-faster speed and suitable for long distance
drawbacks of ethernet
-expensive to set up
-can’t instantly move a device
-requires more time to install
-has too many cables lying around
different types of transmission media
-twisted pair cable
-coaxial cable
-fibre optic cable (made of glass)
drawbacks of WAP
-bandwidth stealing
-confidentiality
benefits of WAP
-portable
-easy to use
-fast and efficient
is ethernet a protocol?
yes
does ethernet uses wireless transmission data?
no
can ethernet transmit data at speeds of up to 100 Gbits per second?
yes
how many bits long is IPv4?
32 bits
what is IPv4 made up of?
-network identifier (identifies the network the traffic needs to go to, first three bytes)
-host identifier (host device where the traffic needs to go to, last byte)
how many bits long is IPv6?
128 bits
IP address
-assigned permanently by administrator
-to conserve IP addresses they often assigned dynamically by the network when a device connects and change over time to allow reuse (dynamic task configuration protocol)
-networks will often have their own subnet address
MAC address
-media access control address
-used to route the frames on a LAN
-usually displayed as a 12 digit hexadecimal number
-devices may have two MAC addresses, one for wired and ne for wireless
-every MAC address is unique and unchangeable
protocols
set of rules that define how devices communicate
TCP / IP
Transmission Control Protocol / Internet Protocol
standards
allow hardware and software to interact across different manufacturers
what are the different protocols?
-TCP (Transmission Control Protocol)
-IP (Internet Protocol)
-HTTP (Hyper Text Transfer Protocol)
-FTP (File Transfer Protocol)
TCP
-how messages are broken up into packets and then reassembled
-detects errors and resends lost packets
IP
-addresses packets
-identifies location of a device on the internet and routes the individual packets from source to destination
HTTP
used for accessing and receiving web pages in the form of HTML files on the internet
FTP
used when transferring computer files between client and server
what are the email protocols?
-POP (Post Office Protocol)
-IMAP (Internet Messaging Access Protocol)
-SMTP (Simple Mail Transfer Protocol)
POP
-receives and holds emails
-creates local copies of emails and deletes the originals
IMAP
-stores email messages on server
-organises messages into folders
-allows simultaneous access by multiple clients
SMTP
sending emails across the internet
differences between POP and IMAP
POP: -works best with one computer to check email
-emails are downloaded and stored on computer you use
-sent email is stored locally on your computer not on email server
IMAP: -can use multiple computers / devices to check emails
-emails stored on the server and device synchronises with server
-sent email remains on the server so can be accessed from any device
