Online Access Free GB0-391 Exam Questions

In the SIP network, which of the following devices belong to UA?

• A.language voice gateway
• B.SIP server
• C.lP phone
• D.connected to a common voice on the gateway PSTN phone

Which of the following descriptions about AH ( Authentication Head ) and ESP ( Encapsulating Security Payload ) are correct?

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

Among the broadband access transmission media, the highest achievable transmission rate is ____ .

• A.electric power line
• B.Copper quality UTP
• C.optical fiber
• D.no radio waves
• E.same coaxial cable

About CBQ said law incorrect ______

• A.It is a congestion management technology implemented by QoS strategy
• B.package contains .1 th BQ , for supporting the AF service, broadband guaranteed queue and controllable delay
• C.packet contains .1 th default queue for supporting the BE service, using the WFQ queue scheduling
• D.package contains .1 th the LLQ , to support EF traffic, is transmitted absolute priority, guaranteed latency

During the SIP UA calling the called party through the proxy server,

• A.behalf of the proxy server to help get the called UA after position, calling UA directly to the called UA initiates a call
• B.Lord called UA all messages are forwarded through a proxy server
• C.to the not right
• D.In addition to the external location request message, the main called UA other messages do not need to be forwarded through a proxy server