networks + web tech Flashcards
(16 cards)
what is a LAN
local area network
spread over a small geographical area or a single site
what is a WAN
wide area network
spread over a large geographical area
owned by a third party
example of a LAN
school
example of a WAN
company with offices in multiple locations
the internet
what are protocols?
a set of rules defining how two computers communicate with each other
what is a firewall?
two NICS between the user and internet designed to prevent unauthorised access to a network
how does a firewall work?
the NICS have packets passing between them and they compare them against a set of rules (packet filters)
if access is denied to a packet it gets dropped/rejected
what is encryption?
encoding data to keep it secure when transmitting it over the internet
only the person with the encryption key can read it
what is network hardware?
physical hardware that maintains a network
they can be build in or not
what is a NIC
-network interface card
-built in
-required to connect a devise to a network
-48 bit value
-twelve digit hexadecimal number
what is a switch?
-device used to direct the flow of data across a network
-used in mesh networks
what is a router?
used to connect two or more networks together
what is a gateway?
used when protocols are not the same between networks, it translates protocols so networks can communicate with each other
what is HTML?
-the language/script that web pages are written in.
-allows browser to interpret and render a webpage for the viewer by describing the structure and order
-written in angle brackets <body>
what is CCS?
cascading style sheets is a language used to describe the style of a webpage
can be internal/embedded or external
what is javascript?
scripting language that is used to add interactivity to websites
it is interpreted not compiled
