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Packet-switching
Files broken into data packets with headers for routing
Network Interface Card (NIC)
Built-in device for network connection, wireless or wired
Media Access Control (MAC) address
Unique address assigned to NIC by manufacturer
Router
Sends data packets to networks closer to destination
Switch
Connects nodes in a network, routes data to correct computer
Hubs
Send data to all connected computers in a network
Wireless networks
Connect using Wi-Fi and broadcast via radio waves
Wireless Access Point (AP)
Device enabling wireless devices to connect to a wired network
LAN
Local Area Network on a single site with shared resources
Topology
The way parts of a system are connected
Star topology
Nodes connected to a central switch for fast data transfer(uses copper cables,
Advantages include individual wire connections and minimal impact if one cable fails.
Bus topology
Devices connected to a central coaxial cable in a linear fashion
Advantages include cost-effectiveness and ease of adding more devices.
Copper cable features
Adequate speed, low cost, affected by electrical interference
Fibre Optic cable features
Very fast, high cost, immune to electromagnetic interference
PAN
Personal Area Network connecting devices near a person
Bluetooth
Wireless method for short-distance device connections
Advantages of wireless Networks
No need for cables, easy to connect new devices.
Devices can be portable within the access point range.
Disadvantages of Wireless Network
Can be less reliable and slower with many devices connected.
Connection speed decreases with distance from the access point.
LAN (Local Area Network)
Operates on a single site with its own cabling system.
Allows resource sharing, easy file access, and centralized data backup.
Computer Network
Two or more computers connected to share information and resources
WAN
Network covering a large geographical area using third-party resources
Protocol
Set of rules governing communication in a network
HTTP
Protocol for accessing web pages on the Internet
HTML
Language for creating web pages
HTTPS
Secure version of HTTP encrypting data
FTP
Protocol for transferring files to/from an FTP server
SMTP
Protocol for sending emails to a mail server
POP
Protocol for downloading emails to a local device
IMAP
Protocol for leaving emails on a server accessible by multiple devices
TCP
Protocol breaking messages into packets, reassembling, error detection, and resending
IP
Protocol routing packets between IP addresses
TCP/IP Protocol Stack
Defines layers for Internet communication: Application, Transport, Internet, Link
Application Layer
Layer where applications create data for transmission
Transport Layer
Establishes connections between hosts, divides data into packets
Internet Layer
Responsible for routing packets, operated by routers
Link Layer
Handles MAC, Ethernet, and Wi-Fi for physical connections