Key terminology 1.5 Flashcards
Star network topology
Multiple nodes connected to a central switch or server.
Mesh network topology
Multiple nodes, switches or routers all connected to one another.
Wi-Fi
A wireless connection to a network requiring a WAP. Data is sent across specific frequencies called channels.
Frequency
The number of times a unit is repeated per unit of time.
Channel
A signal frequency on a Wi-Fi connection.
Encryption
Encoding plain text into cipher text using an encryption key
Ethernet
A standard for creating a LAN with protocols. Data is transmitted as frames.
Frame
Another name for a packet of data. Contains: Source address Destination address Date Sequence number Error checking number
IP address
Internet Protocol Address: a unique string of numbers which identifies each computer on a network.
MAC address
Media Access Control Address: a unique identifier for an NIC.
Protocol
A set of rule governing how two devices communicate.
TCP/IP
Transmission Control Protocol / Internet Protocol: TCP manages packets at the source and destination of data and IP manages the transmission of packets between them.
HTTP
Hypertext Transfer Protocol: a method of requesting data from web servers.
HTTPS
HTTP Secure: used to encrypt sensitive web pages or data when being requested from a web server.
FTP
File Transfer Protocol: used for sending files between computers.
POP
Post Office Protocol: used by clients to receive emails from mail servers.
IMAP
Internet Message Access Protocol: used by clients to receive emails from mail servers and store the emails so that they can be seen on any device.
SMTP
Simple Mail Transfer Protocol: allows mail servers to communicate and send emails between them.
Packet switching
TCP splits data into packets.
IP directs them along different routes.
TCP reassembles them at their destination.
Layers
Application layer: HTTP, HTTPS, SMTP, POP, IMAP
Transport layer: TCP
Internet layer: IP
Network access layer: Ethernet protocols and Wi-Fi protocols
