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    The orange peel book from low to high divides into the computer security four kinds of seven levels: D1, C1, C2, B1, B2, B3, A1.Above all,D1 level does not have the lowest safety margin rank, C1 and the C2 level has the lowest safety margin rank, B1 and the B2 level has the medium safekeeping of security ability rank, B3 and A1 belongs to the highest security rating.

In the network concrete design process, it should act according to each technology standard, the equipment type, the performance requirement as well as the funds which in the network overall plan proposed and so on, the overall evaluation determines one quite reasonably, the performance high network security rank, thus realization network security and reliability.

Third, the network security should have function. In order to adapt the information technology development well, the computer network application system must have following function:
(1) Access control: Through to the specific webpage, the service establishment access control system, in arrives the overwhelming majority attack impediment in front of the attack goal.
(2) Inspects the security loophole: Through to security loophole cyclical inspection, even if attacks may get the attack goal, also may cause the overwhelming majority attack to be invalid.
(3) Attack monitoring: Through to specific webpage, service establishment attack monitoring system, but real-time examines the overwhelming majority attack, and adopts the response the motion (for example separation network connection, recording attack process, pursuit attack source and so on).
(4) Encryption communication: Encrypts on own initiative the communication, may enable the aggressor to understand, the revision sensitive information.
(5) Authentication: The good authentication system may prevent the aggressor pretends the validated user.
(6) Backup and restoration: The good backup and restores the mechanism, may causes the losses when the attack, as soon as possible restores the data and the system service.
(7) Multi-layered defense: The aggressor after breaks through the first defense line delays or blocks it to reach the attack goal.
(8) Sets up the safe monitoring center: Provides the security system management, the monitoring, the protection and the emergency case service for the information system.

Fourth, the network system safety comprehensive solution measures.  If want to realize the network security function, we should carry on the Omni-directional guarding to the network system, and thus formulate the quite reasonable network security architecture. Below on the network system security problem, proposes some guard measure.
Physics safe may divide into two aspects: One is the artificial harm to the network; the other is the network to the users. Most common thing is the constructor who did not understand to the buried cable clearly, thus lead to the destruction of electric cable, this kind of situation may through standing symbolized the sign guards against; Has not used the structurized wiring the network to be able to appear the user frequently to the electric cable damage, this needs to use the structurized wiring to install the network as far as possible; Artificial or natural disaster influence, when to consider the plan.

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