Free H3C GB0-391 Exam Dumps Questions & Answers

Regarding the echo in the VoIP telephone system, which of the following descriptions are wrong ?

• A.back sound into electrical echo and acoustic echo, electrical echo conventional telephone systems is mainly due to two, four-wire transducer impedance mismatch caused by
• B.language voice gateway equipment itself does not bring new echo, but the IP network to bring network latency, increasing the echo time delay, leading to the original feel of the echo in VoIP become energy network The echo of being felt.
• C.speech voice gateway device when performing analog to digital conversion may introduce echo, an echo suppression function but can be configured to reduce the impact on the voice gateway.
• D.In VoIP networks, echo is related to the choice of encoding.The greater the compression ratio, the greater the relative echo in the network.

In the PPPoE application of ADSL , when the CPE side uses the MSR router + ADSL interface card for networking, and the CO side DSLAM uses ATM for uplink, which interfaces need to be PPPoE- related on the CO side centralized router ( PPPoE Server ) Configuration ?

• A.Virtual-Ethernet
• B.Yi Tai Ethernet port
• C.ATM interface
• D.Virtual-Template
• E.dial number Interface

To reinforce the company's network, you need to ____ user authentication and authorization.

• A.access into the internal network users
• B.Gordon user land network equipment
• C.access to the network of the network printer / video terminals
• D.Liu Users browse the company's external website

When the user uses the phone, after picking up the phone handle and inputting the called number, what kind of signaling does the ring back from the receiver belong to ______ .

• A.Call call signaling
• B.monitoring tube signaling
• C.to address signaling
• D.letter information signaling

Which of the following statements about EPCN are correct?

• A.EPCN conforms to HFC- based broadband access specifications such as DOCSIS 1.0/1.1/2.013.0 .
• B.EPCN is a passive EoC technology.The user terminal is a passive device, and the system transmission loss tolerance is low, which limits its application scope to a certain extent.
• C.EPCN is an active EoC technology, and the user terminal is an active device, thus avoiding the limitation of the network topology without passive EoC technology.
• D.EPCN system main memory deployment coaxial cable distribution network portion of the network, the HFC backbone mainly EPON technology fit therewith.