Network security is the protection of the underlying networkinginfrastructur (71) access, misuse, or theft. It involves creating a secureinfrastructure for device and applications to work in a (72) manner.
Network security combines multiple defenses at the edge and in thenetwork. Each network security layer implements（73）controls.Authorized users gain access to network resources. A(74) is a networdevice that monitors incoming and outgoing network traffic and decideswhetherblock specific trffic based on a defined set of security rules. Avirtual （75）encrypts the connection from an endpoint to a network,often over the internet.remote-aceess VPN uses IPsee or Seeure Soekets Layer to aufhenticate thebetween device and network.
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