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== Basic Networking Concepts ==

=== What is a Network? ===
A network is a collection of interconnected devices that can communicate and share resources. These devices can include computers, printers, servers, and more.

=== Key Networking Components ===

* Nodes: Devices connected to the network (computers, printers, servers).
* Links: Physical connections between devices (cables, wireless signals).
* Network Interface Card (NIC): Enables a device to connect to a network.

=== Network Topologies ===
The physical or logical arrangement of network devices.

* Bus: All devices are connected to a single cable.
* Star: All devices are connected to a central device (hub or switch).
* Ring: Devices are connected in a closed loop.
* Mesh: Every device is connected to every other device.

=== Network Protocols ===
Rules that govern communication between devices on a network.

* TCP/IP: The foundation of the internet.
* HTTP: Used for web communication.
* FTP: Used for file transfer.
* SMTP: Used for email transmission.

=== Network Addresses ===
Unique identifiers assigned to devices on a network.

* IP Address: A numerical label assigned to each device on a network.
* Subnet Mask: Defines the network portion of an IP address.
* MAC Address: A unique physical address assigned to each network interface card.

=== Network Devices ===

* Hub: Connects multiple devices on a network.
* Switch: Connects multiple devices on a network, but intelligently forwards data.
* Router: Connects multiple networks and directs traffic between them.
* Modem: Modulates digital signals into analog signals for transmission over phone lines or cable.

=== Network Security ===
Protecting networks from unauthorized access, use, disclosure, disruption, modification, or destruction.

* Firewall: A security system that monitors and controls incoming and outgoing network traffic.
* Encryption: Converts data into a code to prevent unauthorized access.

== Common Networking Protocols and Services ==

=== Networking Protocols ===
Networking protocols are the set of rules that govern communication between devices on a network. They ensure data is transmitted accurately and efficiently.

Key Protocols:

* TCP/IP (Transmission Control Protocol/Internet Protocol): The foundation of the internet. TCP ensures reliable data delivery, while IP handles addressing and routing.
* HTTP (Hypertext Transfer Protocol): Used for transferring data on the World Wide Web.
* HTTPS (Hypertext Transfer Protocol Secure): An encrypted version of HTTP that provides secure communication.
* FTP (File Transfer Protocol): Used for transferring files between computers.
* SMTP (Simple Mail Transfer Protocol): Used for sending emails.
* POP3 (Post Office Protocol 3) and IMAP (Internet Message Access Protocol): Used for retrieving emails from a server.
* DHCP (Dynamic Host Configuration Protocol): Automatically assigns IP addresses to devices on a network.
* DNS (Domain Name System): Translates domain names (like [invalid URL removed]) into IP addresses.

=== Networking Services ===
Networking services are applications or functions that rely on network protocols to provide specific functionalities.

* Email: Sending and receiving electronic messages (SMTP, POP3, IMAP).
* Web Browsing: Accessing and viewing web pages (HTTP, HTTPS).
* File Sharing: Transferring files between computers (FTP).
* Remote Access: Accessing a computer or network from a remote location (SSH, RDP).
* Network Management: Monitoring and managing network devices (SNMP).
* Online Gaming: Playing games with other players over a network (TCP/UDP).
* Video Conferencing: Conducting meetings or conferences over a network (RTP, SIP).

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Networking - Revision history

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