[Jan 23, 2022] Fully Updated GB0-391 Dumps - 100% Same Q&A In Your Real Exam
Latest GB0-391 Exam Dumps - Valid and Updated Dumps
NEW QUESTION 160
Regarding the echo in the VoIP telephone system, which of the following descriptions are wrong ?
- A. 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
- B. 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.
- C. 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.
- D. In VoIP networks, echo is related to the choice of encoding.The greater the compression ratio, the greater the relative echo in the network.
Answer: B,D
NEW QUESTION 161
In EPON applications, if the home gateway or switch on the user side is provided by the operator and unified VLAN management, then the VLAN operation mode on the UNI port should be configured as ____ .
- A. VLAN transparent transmission mode
- B. VLAN Translation Mode
- C. VLAN tagging mode
- D. VLAN Tag mode
Answer: A
NEW QUESTION 162
In ADSL of PPPoE applications, when the CPE side using MSR router + ADSL interface card for networking, co side DSLAM make use IP rows on the co centralized router side ( PPPoE Server ) need to be on which interfaces PPPoE relevant The configuration ?
- A. Virlual-Ethernet
- B. ATM interface
- C. Yi Tai Ethernet port
- D. Virtual-Template
- E. dial number Interface
Answer: C,D
NEW QUESTION 163
The main functions of LNS and LAC in L2TP components are ____ .( Choose one or more )
- A. LAC and LNS are the end points of L2TP sessions
- B. LAC L2TP encapsulates the message received from the remote system and sends it to LNS
- C. The L2TP tunnel is mainly maintained by the LAC
- D. LAC and LNS can be the same device
Answer: A,B
NEW QUESTION 164
The recommended equipment security reinforcement methods include _____ .
- A. sub -level settings login user rights
- B. make use public as the community string network access
- C. setting set all IP addresses can log device
- D. Off Closed FTP and other services
Answer: A,D
NEW QUESTION 165
Which of the following statements about IPSec and IKE is correct is ____ .( Choose one or more )
- A. IKE is only responsible for providing security keys for IPSec establishment and does not participate in IPSec SA negotiation
- B. IKE only with IPSec in conjunction
- C. After IPSec SA is established, data forwarding has nothing to do with IKE
- D. IPSec can only establish a security association through cooperation with IKE
Answer: C
NEW QUESTION 166
The following statements about GRE and BGP MPLS VPN are correct: _______ .
- A. The GRE tunnel needs to be statically configured and the MPLS tunnel of BGP MPLS VPN is dynamically established
- B. It had all VPN technology
- C. that they have adopted the technology can tunnel VPN
- D. GRE private network users can only run static routing protocol, BGP MPLS VPN private network users run BGP dynamic routing protocol
Answer: A,B,C
NEW QUESTION 167
Among the following VPN technologies, the VPNs belonging to the second layer are:
- A. VPLS
- B. VLL
- C. IPSce VPN
- D. GRE VPN
Answer: A,B
NEW QUESTION 168
The business transmission between departments of an enterprise needs to adopt IPSec to provide end-to-end security protection, and data must be encrypted for transmission.
According to the requirements of the enterprise's business transmission security, which working mode and encapsulation protocol should IPSec use ? ( Choose one or more )
- A. tunnel road mode
- B. AH encapsulation protocol
- C. ESP Encapsulation Protocol
- D. transfer transport mode
Answer: C,D
NEW QUESTION 169
The configuration commands on the MSR router are as follows:
acl number 2003
rule 0 permit source 192.168.0.0 0.0.0.255
#
traffic classifier 1operator or
if-match acl 2003
#
traffic behavior 1
filter den
#
qos polic 1
classifier 1behavior 1
#
interface GigabitEthernet0/1
port link-mode route
ip address 192.168.1.1 255.255.255.0
qos appl polic 2 outbound
Then, when the packets with the source addresses of 192.168.2.2 and 192.168.0.2 are forwarded from port G0/1 , the following statement is incorrect: ______
- A. Packets with the source address of 192.168.0.2 are forwarded normally
- B. Packets with the source address of 192.168.2.2 are forwarded normally
- C. Forwarding of packets with the source address of 192.168.2.2 is blocked
- D. Forwarding of packets with the source address of 192.168.0.2 is blocked
Answer: B,D
NEW QUESTION 170
In a typical PPPoE network, both PPPoE Server and PPPoE Client are MSR routers.If you want PPPoE to work in permanent online mode, which of the following configurations are required ? ( Choose one or more ) .
- A. Configure on PPPoE Client : [HG-Dialerl] pppoe-client dial-bundle-number l idle -timeout O
- B. Configure on PPPoE Client : [HG-Ethernet0/0] pppoe-client dial-bundle-number 1
- C. the PPPoE Serve, R & lt on the configuration: [the RTA-virtual- Templatel] PPPoE -client-Number Dial-the bundle.1
- D. Configure on PPPoE Client : [HG-Dialer l] pppoe-client dial-bundle-number l
- E. Configure on PPPoE-Server : [RTA-Virtual-Templatel] pppoe- client dial -bundle-number l idle-timeout 65535
- F. Configure on PPPoE Server : [RTA- EthernetO/O] pppoe-client dial-bundle-number 1
Answer: B
NEW QUESTION 171
Which of the following PPPoE packets may contain valid PPP Session-ID information ?
- A. PADR ( PPPoE-Active Discover Request )
- B. PADS ( PFoPoE Active Discover Session-Confirmation )
- C. PADI ( PPPoE Active Discover Initiation )
- D. PADT ( PPPoE Active Discover Ter minate )
- E. PADO ( PPPoE Active Discover Offer )
Answer: B,D
NEW QUESTION 172
The advantages of the star-level network model include _______ ( choose one or more )
- A. provide high network throughput
- B. by strong network scalability
- C. will be to maintain the network of
- D. drop low-end delay
Answer: B,C,D
NEW QUESTION 173
Which of the following descriptions about H.323 terminals is correct is ____ .
- A. P pass H.323 terminals may not support the video feature
- B. & Poor pass H.323 terminal may not support fax functionality
- C. even connected to the PSTN telephone network fax machine is a standard H.323 terminal equipment
- D. P through PSTN telephone is a standard H.323 terminal
Answer: A,B
NEW QUESTION 174
The following functions of the convergence layer are ____ .( Choose one or more )
- A. High -speed packet-switched
- B. complex routing strategies complicated
- C. owns a large number of interfaces, and for the final connected user computer
- D. access into the security control
Answer: B
NEW QUESTION 175
The four routers R1 , R2 , R3, and R4 are connected in sequence, and Loopback0 interfaces are created on R1 and R4 , and the interface addresses are 1.1.1.1 and 4.4.4.4 respectively.The four devices are configured with static routing protocols to ensure Loopback0 of R1 and R4 .The address is reachable, and a GRE Tunnel is established between R1 and R4 .Check the tunnel interface information on R1 as follows:
[R1]displa interface Tunnel O
Tunnelo current state: UP
Tunnelo current statle: UP
Line protocol current state: UP
Description: Tunnel 0 Interface
The Maximum transmit Unit is 1476
Internet Addess is 10.1.1 .1/30 Primar.
Encapsulation isTUNNEL aggregation ID not set
Tunnel source l.1.1.1 destination 4.4.4.4
Tunnel keeepalive disable
Tunnel protocol/transport GRE/IP.
GRE key disable
Checksumming of GRE packets disabled
Last 300 seconds input:.2 btes/secl 0 packet/sec.
Last 300 seconds output:..2 bytes/sec , 0 packets/sec.
15packets input 840bytes.
0 input error
27packets output , 1248btes
0 0utput error
At this time, if the interrupt R2 and R3 link between, the following statement is correct ____
- A. The status of the Tunnel interface on R1 is Down
- B. Rl on -Tunnel interface remains UP state
- C. The source IP of the Tunnel interface of R4 is 4.4.4.4 , and the destination IP is 1.1.1.1
- D. The IP address of the Tunnel interface of R4 should be 10.0.0.2.
Answer: B,C,D
NEW QUESTION 176
The following are functions of the access layer ____ .( Choose one or more )
- A. High -speed packet-switched
- B. access into the security control
- C. owns a large number of interfaces, and for the final connected user computer
- D. complex routing strategies complicated
Answer: B,C
NEW QUESTION 177
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 simp le 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 0.255.255.255
[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 Ethernet 0/1/0
[RTA-Serial0/2/1] ip address 10.2.1.1 255.255.255.0
[RTA] interface Serial 0/2/1
[RTA-Serial0/2/1] ip address 10.2.1.1 255.255.255.0
[RTA-Serial0/2/1]] ipsec polic 1
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 10.3.1.0 0.255.255.255
[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
[RTA] interface Ethernet 0/1/0
[RTA-Serial0/2/1] ip address 10.3.1.1 255.255.255.0
[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
This shows that ______ .
- A. either any party initiated SA negotiation can be successful
- B. any any party initiated SA negotiation can not succeed
- C. Only there from the RTA to RTB launch of SA negotiation can succeed
- D. Only there from RTB to RTA launched the SA negotiation can succeed
Answer: B
NEW QUESTION 178
Which of the following statements about LR is incorrect is
- A. bits at the link layer, all packets outgoing from the interface can take effect ( critical packets except packets )
- B. It is an active traffic adjustment measure that limits the total rate of packets sent downstream from an interface
- C. so that the flow rate is measured using the token bucket algorithm, would exceed the committed rate of packets into the queue buffer again, it reduces the overall packet loss rate, smooth traffic, introduces additional delay.
- D. Not valid for non- IP packets
Answer: A,D
NEW QUESTION 179
Among the control messages defined by the MPCP protocol, the one sent by the ONU is _____ .( Choose one or more )
- A. Register
- B. Register Ack
- C. The GATE
- D. Register_Req
- E. Report
Answer: B,D,E
NEW QUESTION 180
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