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H3C GB0-391 Exam Syllabus Topics:

H3C Constructing Secure optimized WANs v2.0 Sample Questions:

1. Which of the following descriptions about the structure of SIP messages are correct ?

A) elimination main message body content of the message is a description of the session to be set up, some special SIP message without the message body
B) The some SIP message contains one or more message header, used to identify the type of message
C) Since the start line, the message header, the message body is a SIP basic components message lacks any part of the SIP message is illegal cancellation message
D) There are some special SIP response messages without a start line

2. 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% .Using the displa ike sa and displa ipsec sa commands, the IPSec SA is not established.
The reason for the failure of IPSec configuration is ____ .( Choose one or more )

A) The tunnel mode is used in the IPSec proposal , and the protected data flow is data from network segment to network segment
B) The pre-shared-ke configuration of IKE does not match
C) make use the IKE aggressive mode
D) ACL configuration is incorrect

3. 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) In VoIP networks, echo is related to the choice of encoding.The greater the compression ratio, the greater the relative echo in the network.
C) 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.
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. Which of the following descriptions about AH ( Authentication Head ) and ESP ( Encapsulating Security Payload ) are correct?

A) AH cannot provide data integrity protection
B) two who can provide confidentiality protection
C) two who can provide data origin authentication and optional anti-replay service
D) two can be used simultaneously

5. The configuration commands on the MSR router are as follows :
acl number 2000
rul e o permit source 192.168.0.0 0.0.0.255
acl number 2002
rule o permit source 192.168.2.0 0.0.0.255
#
traffic classifier 2 0perator and
if-match acl 2002
traffic classifier l operator and
if-match acl 2000
##
interface GigbitEthernet0/1
port link-mode route
duplex full
speed 10
ip address 192.168.1.1 255.255.255.0
qos reserved-bandwidth pct 90
qos appl polic test outbound
When the traffic rates of packets with source addresses of 192.168.0.2 , 192.168.2.2 , and 192.168.3.2 are 4Mbps , 4Mbps , 5Mbps , and no other background traffic is forwarded from port G0/l .
The incorrect statement under the team is ____ .

A) The forwarding rate of packets with the source address of 192.168.0.2 is about 3Mbps
B) The forwarding rate of packets with the source address of 192.168.2.2 is about 4Mbps
C) The forwarding rate of packets with the source address of 192.168.2.2 is about 2.7Mbps
D) The forwarding rate of packets with the source address of 192.168.2.2 is about 3Mbps
E) The forwarding rate of packets with the source address of 192.168.0.2 is about 2.7Mbps
F) The forwarding rate of packets with the source address of 192.168.0.2 is about 4Mbps

Solutions: