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Computer Science Revision (Ethernet and Wifi benefits (Ethernet Benefits,…
Computer Science Revision
Key Protocols
TCP/IP HTTP HTTPS FTP POP IMAP SMTP
TCP/IP - communicates to two or more computers. The defence data network, part of the department of defence, developed TCP/IP, and it has been widely adapted as a networking standard.
HTTP - This the underlying protocol used by the World Wide Web and this protocol defines how messages are formatted and transmitted, and what actions Web servers and browsers should take in response to various command
HTTPS - This is an application specific implementation that is a combination of HTTP. HTTPS is used to provide encrypted communication with secure identification of a web server
FTP - This is used top transfer files between two computers over a network and internet
POP - This is a type of computer networking and internet standard protocol that extracts and retrieves emails from a remote mail server for access by the host machine
IMAP - This is similar to POP, but you can access emails from a local client
SMTP - This is a machine that takes care of the whole email delivery process
Ethernet and Wifi benefits
Ethernet Benefits
Stable connection
Reduced possibility to be hacked
More secure
Faster traffic speed
Generally will have a good quality signal
Wifi Benefits
Cheap set up costs
More vulnerable to hacking
The signal quality will reduce through wall or obstruction
Can connect more than one device without the need of extra software/hardware
Interference can occur
NetworkTopologies
Mesh - it is expensive to set up. everything is connected. when the server goes down they all go down. i one computer goes down, the rest will work but it would be hard to find which computer is down
Star - this is cheap to set up. if one computer goes down the rest would still work. it would be easier to find the broken device.
Bus Stop - it is cheap but yet not reliable. if the main wire goes down, all the computers and devices will no longer work. it would take ages to get the information you want is you were right at the back. it has slow latency.
Events that take place during the fetch-execute cycle
an instruction is fetched from the memory
the instruction is then decoded
the decoded instruction is then executed so that the CPU performs continuously
the program counter is then incremented