Download Network Defense Essentials Exam.112-51.VCEDumps.2024-04-09.56q.tqb

A firewall is a software or a hardware device on a network or host that filters the incoming and outgoing traffic to prevent unauthorized access to private networks. A firewall can use various criteria, such as IP addresses, ports, protocols, or application rules, to allow or deny the traffic. A firewall can also perform other functions, such as logging, auditing, encryption, or proxy services. A firewall can be deployed at different levels of a network, such as network perimeter, network segment, or host level12.Reference: Network Defense Essentials - EC-Council Learning, Firewall (computing) - Wikipedia

A VPN protocol is a component of VPN that is used to manage tunnels and encapsulate private data. A VPN protocol defines the rules and standards for establishing and maintaining a secure connection between the VPN client and the VPN server. A VPN protocol also specifies how the data is encrypted, authenticated, and transmitted over the tunnel. Some common VPN protocols are IPSec, SSL/TLS, PPTP, L2TP, and OpenVPN12.Reference: Network Defense Essentials - EC-Council Learning, VPN Protocols Explained & Compared: OpenVPN, IPSec, PPTP, IKEv2