Private IP Addresses
Private IP Addresses: IP addresses that are not publicly routable and are used within a private network. It is used in local area networks (LANs) and virtual private networks (VPNs) to identify and communicate with devices within the network. Examples include the IP address ranges reserved for private use, such as 10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16.
Port knocking
Port knocking: Port knocking is a security technique that involves a series of connection attempts to a sequence of closed ports. If the correct sequence is received, the system will open a specific port or initiate some other predefined action. This “knock” acts like a secret handshake to authorize access, and because the ports are […]
Port security
Port security: A set of rules and parameters applied on a network switch port to secure the network by controlling who can connect to it and limiting the number of MAC addresses allowed on a single port. This feature can prevent unauthorized access by disabling the port or sending an alert if an unexpected device […]
Port
Port: A specific virtual point where data is exchanged between a device and the network. Each port corresponds to a unique number and specific protocol, serving as a communication endpoint for applications to exchange data using protocols like TCP or UDP. Ports enable the host device to manage multiple connections simultaneously, with each application or […]
Post Office Protocol (POP)
Post Office Protocol (POP): A protocol used for receiving email. It is commonly used by email clients to retrieve messages from a server for local storage and access. For example, a user may configure their email client to use POP to retrieve messages from their email account, allowing them to access their email even when […]
PPPoE (Point-to-Point Protocol over Ethernet)
PPPoE (Point-to-Point Protocol over Ethernet): A network protocol that encapsulates PPP frames inside Ethernet frames. It combines the point-to-point and Ethernet network technologies, enabling a single, direct connection between users and the internet service provider. With built-in security and error detection features, PPPoE is often used in both home and corporate internet connections.