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H3C GB0-391 Exam Syllabus Topics:

H3C Constructing Secure optimized WANs v2.0 Sample Questions:

1. Based on SOA network architecture to enterprise IT systems into which of the following levels ? ( Select one or more )

A) mesh network layer
B) business service layer
C) shall by layer
D) service service layer

2. The main functions of LNS and LAC in L2TP components are ____ .( Choose one or more )

A) LAC L2TP encapsulates the message received from the remote system and sends it to LNS
B) LAC and LNS are the end points of L2TP sessions
C) LAC and LNS can be the same device
D) The L2TP tunnel is mainly maintained by the LAC

3. The interconnection between ordinary telephones , PBXs and other devices has a unified interface standard, including analog and digital interfaces.The following belong to the digital voice interface is ______ .

A) POS
B) FXS
C) E1
D) T1

4. The wrong description of the relationship between RT and RD is ____ .

A) with a VPN to RT value must RD same value
B) the RD value of their respective VPN of RT attributes Import Target property or Export Target a property list
C) same on a device different VPN of RD value and the RT attribute values can not be configured to be the same

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

A) language voice gateway equipment itself does not bring new echo, but the lP network brings network latency, increasing the echo time delay, leading to the original feel of the echo in VoIP become energy network Felt echo
B) In a VoIP network, the echo is related to the choice of encoding.The greater the compression ratio, the greater the relative echo in the network.
C) speech voice gateway when performing analog to digital conversion may introduce echo, but can be configured to suppress echo in voice gateway function to reduce this effect
D) back sound into electrical echo and acoustic echo, a conventional telephone system is mainly due to two electrical echo, four-wire conversion impedance mismatch caused by

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