Network security is the protection of the underlying networking infrastructure(1) access, misuse, or theft. It involves creating a

secure infrastructure for device and applications to work in a (2) manner.

Network security combines multiple defenses at the edge and in the network. Each network security layer implements (3) controls.Authorized users gain access to network resources. A (4) is a network device that monitors incoming and outgoing network traffic and decides whether block specific traffic based on a defined set of security rules. A virtual (5) encrypts the connection from an endpoint to a network,often over the internet.remote-access VPN uses IPsec or Secure Sockets Layer to authenticate the between device and network.
(1)A.unauthorized
B.authorized
C.normal
D.frequent
(2)A.economical
B.secure
C.fair
D.efficient
(3)A.computing
B.translation
C.policies
D.simulations
(4)A.firewall
B.router
C.gateway
D.switch
(5)A.public
B.private
C.personal
D.political