H3C GB0-391

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H3C GB0-391 Exam Syllabus Topics:

H3C Constructing Secure optimized WANs v2.0 Sample Questions:

Question 1

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

A. 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
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. 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
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

Question 2

Which of the following descriptions of the traditional telephone system is correct is ____ .

A. electrically telephone by the subscriber loop connected to the PBX or central office switches, the user is connected to the telephone ring and prostrate PBX a line between the pair comprising Tip and Ring , wherein Ring ground, of Ti access PBX negative electrode.
B. pass the real machine is FXS ordinary telephone devices can be connected to a central office switch via an ordinary telephone line FXO interface.
C. Electric as telephone ringing tone dial tone, is a pair of end PBX provides complete voltage or central office switches.

Question 3

About CBQ said law incorrect ______

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

Question 4

Which of the following descriptions of MPLS lsr-id is correct is _______ .

A. lsr-id must be configured to be the same as the Router ID of the LSR
B. The format of lsr-id is the same as the IP address
C. lsr-id is used to identify an LSR device in the MPLS network
D. lsr-id is unique in MPLS network

Question 5

When deploying a BGP MPLS VPN network, in order to be able to establish an end-to-end MPLS tunnel between PEs , _______ is required .

A. no polymerizable address routing interconnect the public network interface
B. PEs need to learn from each other the precise route of the 32 -bit mask of the Loopback interface address of the peer PE
C. not polymerizable PE of Loopback interface address routing
D. PE cannot aggregate private network routes learned from CE

Solutions: