Best-Effort model has the following features ?

• A.reality now simple.Save processing resources and fast processing speed
• B.pass through queues implemented
• C.the number of broadband data streams, delay, jitter and packet loss controllable
• D.District Do not treat different types of business

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Which of the following are information signaling ____ .

• A.used when the user using the telephone, after the telephone handset from the chamber called number, outgoing handset to ring back tone.
• B.by the user when using the phone, pick up the telephone handset, the handset came from the dial tone.
• C.by the user using the phone, pressing the number keys to PBX transmits the called number representing a series of low and high audio frequencies of the audio frequency.
• D.by the user using the phone, pick up the telephone handset called number, called the ellipsoid of the ringing telephone.

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In BGP MPLS VPN networking, where does the RT value exist in ______ ?

• A.In the private network packet forwarded by PE to CE
• B.In the routing update message exchanged between PEs
• C.In the route cancellation message exchanged between PEs
• D.In the private network packet forwarded by the PE to the P device

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Which of the following statements about SSL VPN access control is correct is ______ .

• A.dynamic state authorization authorization and security policy is still the intersection of authorization
• B.dynamic state does not require authorization client terminal installs
• C.dynamic state authorization is not required to create a security policy
• D.static state authorized authentication including local and external authentication certification in two ways

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below with respect to the AH ( the Authentication Header , Authentication Header ) and the ESP ( Encapsulating Securit Paload , the Encapsulating Security Payload ) described right there ____ .( Choose one or more )

• A.two who can be used at the same time
• B.two who can provide data origin authentication and optional anti-replay service
• C.two who can provide confidentiality protection
• D.AH cannot provide data integrity protection

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