GB0-391 Practice Exam and Study Guides - Verified By ExamCost Updated 468 Questions
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NEW QUESTION 25
In a VoIP network, which of the following factors are related to the bandwidth saved by VAD technology ?
- A. mesh network congestion degree
- B. selected by signaling type
- C. selected encoding type used
- D. said language and characteristics of the speaker
Answer: C,D
NEW QUESTION 26
Among the packets encapsulated by the GRE protocol, the payload protocol is the IPX protocol, and the bearer protocol is the IP protocol.The encapsulation sequence of the packet from the link layer to the payload data is the link layer ____GRE____ payload data.
- A. IPX , IPX
- B. IP , IP
- C. lP , IPX
- D. IPX , IP
Answer: C
NEW QUESTION 27
Please add the correct parameters in the following PPPoE Cllent configuration:
Answer:
Explanation:
110
NEW QUESTION 28
Which of the following statements about SSL VPN access control is correct?
- A. dynamic state authorization is not required to create a security policy
- B. dynamic state does not require authorization client terminal installs
- C. static state authorized authentication including local and external authentication certification in two ways
- D. dynamic state authorization authorization and security policy is still the intersection of authorization
Answer: A,B,C
NEW QUESTION 29
Which of the following statements about the access network is correct is _____
- A. access network typically includes a user transmission system, terminal multiplexers or network,
- B. Compared with backbone network, access network is often the bottleneck of network transmission speed
- C. The access network can also be Ethernet
- D. access into generally refers to the connection between the user and the network operator of the network close to the user central office
Answer: A,B,C,D
NEW QUESTION 30
The edge devices of the MPLS network are called _______ .
- A. LSP
- B. LRR
- C. LER
- D. LSR
Answer: C
NEW QUESTION 31
When SIP UA calls the called party through the proxy to the server,
- A. Lord called UA All messages are forwarded through a proxy server
- B. In this environment, the response message of the called UA is sent to the proxy server instead of the calling UA
- C. In addition to the external location request message, the calling UA other messages need not be forwarded through the redirection server
- D. to the not right
Answer: A,B
NEW QUESTION 32
When the link type of the ONU port is Access , its processing method for downstream messages is ____ .
- A. Only allow packets without tags to pass, and add the default VLAN tag to the packets
- B. for without receipt of the Tag message, add the default VLAN Tag , to receive with Tag packets forwarded directly
- C. Only the packets with the default VLAN tag are allowed to pass and go to the tag
- D. Only allow tagged messages to pass
Answer: C
NEW QUESTION 33
802.1p CoS divided the ______ Classes of Service.
- A. 0
- B. 1
- C. 2
- D. 3
Answer: C
NEW QUESTION 34
A session is initiated by a UA through a proxy server, when a UA wants to end the session.
- A. will be the end of the session request is sent to the other party at the same time UA and proxy server
- B. will be the end of the session request to the proxy server
- C. will be the end of the session request is sent directly to the other UA
- D. needs to be based on the proxy server is no status quo is the status quo or to determine if the request will be sent to which device
Answer: B
NEW QUESTION 35
In the SIP network, when the redirect server receives the session request message sent by the calling UA , ____ .
- A. Heavy directional wiping search server called UA position information, the position and initiates a session request
- B. re- orienting the received server directly calling UA session request ; forwards the message to the called UA
- C. Heavy targeting server to find the called UA position information, which is returned to the calling UA
- D. Lord called UA all messages are forwarded through a proxy server
Answer: C
NEW QUESTION 36
The advantages of the star-level network model include _______ ( choose one or more )
- A. by strong network scalability
- B. provide high network throughput
- C. will be to maintain the network of
- D. drop low-end delay
Answer: A,C,D
NEW QUESTION 37
When the queue reaches the most after a large value, the message will be used _____ embodiment discards
- A. WRED
- B. RED
- C. Tail discard
- D. Press time sequence, discarding most to packets enqueued
Answer: C
NEW QUESTION 38
Which of the following are signaling _____ .
- A. by the user using the phone, pick up the telephone handset called number, outgoing echo from handset bell
- 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, the called telephone ringing
- 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 39
The information displayed on the MSR router is as follows:
Sstem Defined Behavior Information:
Behavior: ef
Expedited Forwarding:
Bandwidth 20 (% ) Cbs-ratio 25
Behavior: af
Assured Forwarding:
Bandwidth 20 (%)
Discard Method: Tail
Behavior: be
-none-
Then the following statement is correct _____
- A. explicit information indicating the behavior of a user-defined
- B. which is defined in the EF queue and AF queues, bandwidth is reserved bandwidth occupied respectively 20%
- C. use can change the percentage of the bandwidth occupied by the queue user behavior
- D. significant information is shown the behavior of the system defined
Answer: B,D
NEW QUESTION 40
The following belongs to the asymmetric key algorithm is ____ .
- A. DSA
- B. RSA
- C. DH
- D. DES
Answer: A,B,C
NEW QUESTION 41
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