[Oct-2021] Get 100% Real GB0-391 Exam Questions, Accurate & Verified DumpTorrent Dumps in the Real Exam!

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NEW QUESTION 210
VPN that Which of the following types of RT configuration is wrong ?

• A. need to isolate the private network user belongs to two VPN of RT attributes which Import Target attributes and Export Target intersection exists between attribute
• B. required to isolate the private network user belongs to two VPN of RT attributes which Export Target attributes and Export Target intersection exists between attribute
• C. needs to be exchange of visits of two private network user belongs VPN of RT attribute, its Import Target property and Import Target intersection exists between property
• D. need to exchange visits of two private network user belongs VPN 's RT attribute, its Import Target property and Export Target intersection exists between property

Answer: A

 

NEW QUESTION 211
In VoIP networks, the bandwidth saved by VAD technology is related to which of the following factors ?

• A. mesh network congestion degree
• B. said language and characteristics of the speaker
• C. selected by signaling type
• D. selected encoding type used

Answer: B,D

 

NEW QUESTION 212
The advantages of the star-level network model include _______ ( choose one or more )

• A. will be to maintain the network of
• B. provide high network throughput
• C. by strong network scalability
• D. drop low-end delay

Answer: A,C,D

 

NEW QUESTION 213
Which of the following factors will not affect the VoIP voice quality ______?

• A. Packet loss on IP network
• B. choose a type of numbering
• C. selected by signaling type
• D. back sound

Answer: C

 

NEW QUESTION 214
The following information about IToIP The mistake is ____ .

• A. based on IToIP built IT system users can create a standard, compatibility, security, intelligent and manageable IT environments.
• B. IToIP requires an IT system to be constructed with an IP network as the infrastructure .
• C. IToIP closely connects applications and infrastructure, greatly improving the operating efficiency of IT systems.
• D. various kinds of IT resources can easily share and use standard lP infrastructure, to achieve further integration of various technologies and applications of communications, computing, storage, networking and so on.

Answer: C

 

NEW QUESTION 215
In the EPCN network as shown in the figure , when sending data from CLT to users 1 , 2 , 3 , which of the following statements is correct?

• A. CNU1 will receive packets 1 , 2 , and 3 , but it will only send packet 1 to end user 1 , and discard packets 2 and 3
• B. CNU1 will only receive package 1
• C. terminating end user 1 receives packet 1 , 2 , 3 , but it accepts only the packet 1 , the packet is discarded 2 and packages 3
• D. CNU1 will receive packages 1 , 2 , and 3 and send them all to the end user 1
• E. terminating end user 1 will only receive the packet 1

Answer: A,E

 

NEW QUESTION 216
If the teams are each corresponding to a type of packets, the transmission ratio of the amount of each queue in order of increasing, both 1: 2: 3: ...: most large number of queues, port speed is assumed that the scheduling application 100Mbps , when the packets corresponding to each queue are forwarded at a speed of 20Mbps and the port is congested.The first 9 broadband packet queue may be used corresponding approximately to ______

• A. 7.35%
• B. ..5.92%
• C. 6.62%
• D. 6.58%

Answer: C

 

NEW QUESTION 217
The following information about VoIP saying voice transmission error is ______ .

• A. need to RTP to provide re-ordering mechanism
• B. needs to UDP provides a time stamp mechanism
• C. need to UDP provides multiplexing mechanism
• D. needed to TCP to provide reliability mechanisms

Answer: B,D

 

NEW QUESTION 218
Which of the following are signaling _____ .

• A. by the user using the phone, pick up the telephone handset called number, the called telephone ringing
• B. by the user using the phone, pressing the number keys to PBX transmits the called number representing a range of low frequency tones and high frequency due.
• C. by the user using the phone, pick up the telephone handset called number, outgoing echo from handset bell
• D. by the user when using the phone, pick up the telephone handset, the handset came from the dial tone.

Answer: A,C,D

 

NEW QUESTION 219
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. dial number Interface
• D. ATM interface
• E. Virtual-Template

Answer: A,D,E

 

NEW QUESTION 220
In the SIP network, which of the following devices belong to UA?

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

Answer: B,D

 

NEW QUESTION 221
The key indicators used to measure network transmission capacity are

• A. When the delay ( Dela )
• B. wide band ( Bandwidth )
• C. swallow spit amount ( Throughput )
• D. shaking motion ( the Jitter )

Answer: B,C

 

NEW QUESTION 222
Which of the following H.225 messages called for the direction of the caller indicates that call processing progress state ?

• A. Progress
• B. Setup
• C. Call-proceeding
• D. Alerting

Answer: A,C,D

 

NEW QUESTION 223
In the GRE encapsulation of IP over IP , the hexadecimal value of the Protocol Tpe field of the GRE header is Ox____ .( Fill in 16 hexadecimal digits )

• A. 0800

Answer: A

 

NEW QUESTION 224
IntServ model has the following features ?

• A. can to a large-scale deployment in the Internet
• B. mention for absolute and accurate QoS guarantee, does not change with network status affected
• C. be to track and record the state of each stream, good scalability
• D. can to provide end to end QoS service

Answer: B,D

 

NEW QUESTION 225
In the BGP MPLS VPN network, which of the following items ______ exist on the P device ?

• A. Public network routing table
• B. Public network label forwarding
• C. Private network label forwarding
• D. Private network routing table

Answer: A,B

 

NEW QUESTION 226
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