A.mention for untrusted sites of the Java Blocking ( the Java blocking ) function

B.by a strong session logging function

C.can be detected transmission protocol information, it can be the source and destination addresses and ports, decided to TCP or UDP whether the packet into the internal network through a firewall.

D.Root according invasive application layer connection based protocol state dynamically determine whether a packet is allowed to pass through the firewall to the internal network, so as to prevent malicious

A.that a call will be discontinued in Q.931 stage

B.Does not affect calls between terminals

C.that a call will be discontinued in RAS stage

D.that a call will be discontinued in H.245 stage

A.IKE aggressive mode can provide authentication

B.IKE aggressive mode is more secure than main mode

C.adopted by IKE aggressive mode can provide a speed negotiation

D.In the case that both parties in communication can know the IP address of the initiator in advance and need to use the pre-shared key, the aggressive mode can be used

A.G.729

B.G.711

C.G.723

A.PUPSPV mode can accurately user and business equipment, each user's business has a corresponding VLAN ID identification

B.The PSPV method uses the same VLAN to mark all services of the same user , but the service quality cannot be guaranteed.

C.In PUPV mode, all users in the cell share the same business VLAN ID

D.PUPSPV mode can be precisely designated user service, each service of each user has a corresponding VLAN ID identity