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H3C GB0-391 Exam Syllabus Topics:

H3C Constructing Secure optimized WANs v2.0 Sample Questions:

1. In BGP MPLS VPN networking, where will the private network label exist in the following locations ?

A) Private network routing between PE and CE
B) In the private network packet forwarded by PE to CE
C) Private network routing between PEs
D) In the private network packet forwarded by the PE to the P device

2. Which of the following statements about VPNv4 addresses is correct is _______ .

A) VPNv4 address length is 96bit
B) VPNv4 address will not appear in user data packets
C) In BGP MPLS VPN group network, a public network forwarding the packet destination address is VPNv4 address
D) VPNv4 addresses have more RD prefixes than IPv4 addresses

3. Regarding the echo in the VoIP telephone system, which of the following descriptions are correct ?

A) 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.
B) 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
C) In VoIP networks, echo is related to the choice of encoding.The greater the compression ratio, the greater the relative echo in the network.
D) 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.

4. QoS can determine which specific behavior set a message belongs to through _____ .( Choose one or more )

A) match with DSCP
B) matching with 802.1x
C) matched with IP addresses , the MAC address , the VLAN number, protocol type, port number of the transport layer
D) Configure the trusted port priority or packet priority on the interface
E) match with IP Precedence
F) match with COS

5. During the SIP UA registration process, a response message with a status code of 401 was received, stating that ____?

A) Table shows UA request message sent by the server contains the fields do not know, registration failed
B) Table shows the server needs UA transmit authentication information, UA after receiving the response, it would Laid own authentication information registration request sent by a second server to register
C) UA has been registered on the registration server normally
D) Table showing UA sends a request message packet server sets the field do not know, but it has been ignored server, UA still successfully registered

Solutions: