SLR11 - 1 network characteristics and protocols Flashcards
what is a standalone machine?
A single computer not connected to anything else
state the advantages of networks
+ Users can share files
+ users can share peripherals and connections to other networks such as the internet
+ users can access files from any computer on the network
+ servers can control security, software updates and backup of data
+ communication with other people - email, social networking
state the disadvantages of networks
+ increased security risks to data
+ malware and viruses spread very easily between computers
+ if a server fails, computers connected to it may not work
+ computers may run slower when there’s a lot of traffic on the network
what are standards?
A set of hardware and software applications enabling manufacturers to to create products which are compatible with each other.
state the need for standards
standards are vital for devices to be able to interact or communicate with one another
name 9 protocols
+ HTTP
+ HTTPS
+ FTP
+ TCP
+ UDP
+ IP
+ POP
+ IMAP
+ SMTP
name 3 email protocols
+ POP (post office protocol)
+ SMTP (simple mail transfer protocol)
+ IMAP (internet message access protocol)
name a file transfer protocol
FTP (file transfer protocol)
name 2 web page requests protocols
HTTP (hypertext transfer protocol)
HTTPS (hypertext transfer protocol secure)
name 3 communication protocols
POP (Post office protocol)
IMAP (Internet message access protocol)
SMTP (simple mail transfer protocol)
what does the TCP protocol do?
The Transmission Control Protocol (TCP) provides error free transmission between 2 routers
what does the IP protocol do?
The internet protocol (IP) routes packets over a wide area network
what does the UDP protocol do?
The user datagram protocol (UDP) sends short messages using datagrams.
when is UDP normally used?
When speed is prioritised over accuracy
state the differences between TCP and UDP
UDP has no error checking unlike TCP
UDP is significantly less reliable than TCP
UDP maintains an…
open, two-way connection (ideal for gaming)
what does HTTP do?
It provides a way for a client and server to send and receive requests and deliver HTML pages
HTTPS provides…
extra security and authentication
When is HTTPS used?
when a website is dealing with sensitive information such as passwords and banking details
what is FTP used for?
To send files between computers over a wide area network (WAN)
What does SMTP do?
Simple mail transfer protocol (SMTP) transfers outgoing emails between servers, and from email clients to servers
what does IMAP do?
Internet message access protocol (IMAP) keeps emails on the mail server.
It maintains synchronicity between devices
