Updated Jan-2022 Test Engine to Practice GB0-391 Dumps & Practice Exam
Dumps Collection GB0-391 Test Engine Dumps Training With 468 Questions
NEW QUESTION 51
During the SIP UA calling the called party through the proxy server,
- A. behalf of the proxy server to help get the called UA after position, calling UA directly to the called UA initiates a call
- B. In addition to the external location request message, the main called UA other messages do not need to be forwarded through a proxy server
- C. Lord called UA all messages are forwarded through a proxy server
- D. to the not right
Answer: C
NEW QUESTION 52
Which of the following service models are usually included in QoS ?
- A. Best Effort
- B. DiffServ ( Differentiated Service )
- C. IntServ ( Integrated Service )
- D. FIFO ( First Input First Output )
Answer: A,B,C
NEW QUESTION 53
Which of the following statements about VoIP voice transmission is correct is ______ .
- A. needs to RTP provides a time stamp mechanism
- B. needed to TCP to provide reliability mechanisms
- C. need to UDP provides multiplexing mechanism
- D. need to RTP to provide re-ordering mechanism
Answer: A,C,D
NEW QUESTION 54
In L2TP VPN , LAC ( LATP Access Concentrator , L2TP access concentrator ) receives the IP data packet sent from the remote system to the server , and needs to encapsulate the data packet and send it to LNS ( L2TP Network Server , L2TP) Network server ) , the encapsulation format of the data packet transmitted between LAC and LNS is
- A. Private network data packet ->PPP header ->UDP header ->L2TPT header -> Public network IP header
- B. Private network data packet ->PPP header ->UDP header -> public network IP header ->L2TPT header
- C. Private network data packet ->L2TPT header ->PPP header ->UDP header -> public network IP header
- D. Private network data packet ->PPP header ->L2TPT header ->UDP header -> Public network IP header
Answer: A
NEW QUESTION 55
When a PPP frame is encapsulated by adding an L2TP header, it will be marked with the correct Tunnel ID and Session ID to identify its tunnel and session attributes.The Tunnel ID ( tunnel identifier ) in the L2TP header is assigned by ____ , and the Session ID ( session identifier ) is assigned by ____ .
- A. This end LAC , the local LAC
- B. This end of the LAC , the peer LNS
- C. The opposite end LNS , the opposite end LNS
- D. to end the LNS , the local LAC
Answer: C
NEW QUESTION 56
Which of the following statements about SOA and IToIP is correct is ____ .
- A. IToIP allows flexible, fast and efficient construction of enterprise intelligent applications, and can quickly adapt to changes in enterprise business processes.
- B. SOA is based on the network, eliminates the information gap caused by heterogeneous systems, integrates various services such as storage, security, and multimedia, and realizes the componentization and resourceization of IT infrastructure.
- C. The IToIP solution embodies the core idea of SOA .
- D. SOA solutions to the requirements of IT infrastructure integration, unified web-based technology to build IT infrastructure platform.
Answer: A,C
NEW QUESTION 57
The encapsulation format of the voice data transmitted in the VoIP network is
- A. IP TCP the I the I the I the RTP speech sound data
- B. IP the I the I the RTP speech sound data
- C. IP UDP the I the I the I the RTP speech sound data
- D. IP the I the I RTCP UDP the I the I the RTP speech sound data
Answer: C
NEW QUESTION 58
Safety management needs to pay attention to the content of ______ .
- A. Net network on the user's behavior
- B. with user compliance with security system
- C. net flow where the envelope
- D. network security incidents on the network
Answer: A,B,C,D
NEW QUESTION 59
Which of the following parameters will not be included in an MP-BGP route withdrawal message ?
- A. RT 's Export Target property
- B. Private network label
- C. RD prefix
- D. RT 's Import Target attribute
Answer: A,B,D
NEW QUESTION 60
Factors that affect VoIP voice quality include ______ .
- A. selected by signaling type
- B. Packet loss on IP network
- C. choose a type of numbering
- D. back sound
Answer: B,C,D
NEW QUESTION 61
IPSec polic is configured between the two routers , after the policy is issued to the corresponding interface, the ping command is used to check the interoperability of the protected data flow, and it is found that the data passes 100% .Use displa ike sa and displa ipsec sa to order, it shows that IPSec SA is not established.
The reason for the failure of IPSec configuration is ____ .( Choose one or more )
- A. ACL configuration is incorrect
- B. The remote-add ress address of IKE is not the interface address of the peer router
- C. the IKE the pre-shared-ke configuration mismatch
- D. The transmission mode is used in the IPSec proposal , and the protected data flow is data from network segment to network segment
Answer: A
NEW QUESTION 62
When a user's private network message is forwarded in the BGP MPLS VPN network, which of the following parameters may appear in the user's private network message ?
- A. RT
- B. Private network label
- C. Public network label
- D. RD
Answer: B,C
NEW QUESTION 63
In the process of issuing the digital certificate application in the void, the PKI ( Public Infrastructure Ke , public key systems ) role of the various components were _____ .
- A. The CA sends the issued certificate to the LDAP server to provide directory browsing services
- B. real body wishes to obtain a digital certificate, first of all to RA ( Registration Authority ) apply, RA after the audit entity identity, the identity of the entity and the public key information is sent to a digital signature to the CA ( Certificate Authority )
- C. After the CA verifies the digital signature, it agrees to the entity's application and issues a certificate for the entity
- D. real- time body want to revoke the certificate, the RA ( Registration Authority ) submit an application
Answer: B,C
NEW QUESTION 64
The following belongs to the asymmetric key algorithm is ____ .
- A. DH
- B. RSA
- C. DSA
- D. DES
Answer: A,B,C
NEW QUESTION 65
In the conservative label retention mode, illustrated by networking, LSR2 can keep what stage LSR needle to 20.0.0.1/24 tag information that route ?
- A. LSR4
- B. LSR5
- C. LSR1
- D. LSR3
Answer: D
NEW QUESTION 66
In FIG illustrated EPON networking, the OLT to the network all the ONU ( the ONU1 to ONUn ) to transmit data, the following statements is correct is ____ .( Choose one or more )
- A. Line Road 0 ~ n- downlink data is the same
- B. Line Road 0 have all the ONU data
- C. Line Road 1 on which all the ONU data
- D. wire passage 2 is only to ONU2 data
Answer: A,B,C
NEW QUESTION 67
As shown in the figure, the configurations of the two security gateways are:
RTA
[RTA] ike peer 123
[RTA-ike-peer-123] pre-shared-ke simple 123
[RTA-ike-peer-123] remote-address 10.2.1.2
[RTA-ike-peer-123] local-address 10.2.1.1
[RTA-ike-peer- 123] quit
[RTA] ipsec proposal 1
[RTA -ipsec-proposal-1] quit
[RTA]acl number 3000
[RTA-acl-adv-3000] rule 0 permit ip source 10.1.1.0 0.0.0.255 destination 10.3.1.0 0.0.0.255
[RTA]ipsec polic 1 1 isakmp
[RTA-ipsec-polic-isakmp-1-1] securit acl 3000
[RTA-ipsec-polic-isakmp-1-1] ike-peer 123
[RTA-ipsec-polic-isakmp-1-1] proposal 1
[RTA-ipsec-polic-isakmp-1-1] quit
[RTA] interface Serial0/2/1
[RTA-Serial0/2/1] ip address 10.2.1.1 255.255.255.0
[RTA-Serial0/2/1] ipsec polic 1
[RTA] interface Ethernet 0/1/0
[RTA-Serial0/2/1] ip address 10.1.1.2 255.255.255.0
RTB:
[RTB] ike peer 123
[RTB-ike-peer-123] pre-shared-ke simple 123
[RTB-ike-peer-123] remote-address 10.2.1.1
[RTB-ike-peer-123] local-address 10.2.1.2
[RTB-ike-peer-123]quit
[RTB] ipsec proposal 1
[RTB-ipsec-proposal-1] quit
[RTB]acl number 3000
[RTB-acl-adv-3000] rule 0 permit ip source 10.1.1.0 0.0.0.255 destination 10.3.1.0.0.0.0.255
[RTB]ipsec polic 1 1 isakmp
[RTB-ipsec-polic-isakmp-1-1] securit acl 3000
[RTB-ipsec-polic-isakmp-1-1] ike-peer 123
[RTB-ipsec-polic-isakmp-1-1] proposal 1
[RTB -ipsec-polic-isakmp-1-1] quit
RTB] interface Serial0/2/1
[RTB-Serial0/2/1] ip address 10.2.1.2 255.255.255.0
[RTB-Serial0/2/1]]ipsec polic 1
[RTA] interface Ethernet 0/1/0
[RTA-Serial0/2/1] ip address 10.1.3.1 255.255.255.0
This shows that ______ .
- A. any any party initiated SA negotiation can not succeed
- B. Only there from RTB to RTA launched the SA negotiation can succeed
- C. Only there from the RTA to RTB launch of SA negotiation can succeed
- D. either any party initiated SA negotiation can be successful
Answer: A
NEW QUESTION 68
In the GRE encapsulation of IP over IP , IP uses the protocol number ____ to mark the GRE header.
- A. 47
Answer: A
NEW QUESTION 69
In L2TP networking, false set LAC and LNS are case has been in the public network, and are correct Unicom, if Tunnel construction legislation fails, the possible causes are
- A. On the LAC side , the address of the LNS is incorrectly set
- B. There is no L2TP group set on the LNS end that can receive the opposite end of the tunnel
- C. Tunnel verification fails
- D. The username and password set on the LAC side are incorrect
Answer: A,B,C
NEW QUESTION 70
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