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H3C Constructing Secure optimized WANs v2.0 Sample Questions:

1. 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

2. Execute the displa interface tunnel command on a router to display the information of the GRE tunnel interface as follows:
<Router> displa interface Tunnel O
Tunnelo current state: UP
Line protocol current state: UP
Description: Tunnelo Interface
The Maximum Transmit Unit is 1476
Internet Address is 192.1.2.1/24 Primar
Encapsulation is TUNNEL , agg regation ID not set
Tunnel source 10.1.11.1 , destination 10.1.13.1
Tunnel keepalive enable , Period ( 10 s ) , Retries ( 3 )
Tunnel protocol/transport GRE/IP
GRE ke disabled
Checksumming of GRE packets disabled
Last 300 seconds input: 0 btes/sec , 0 packets/sec
Last 30 0 seconds output: 0 btes/sec , 0 packets/sec
4 packets input , 72 btes
0 input error
1 packets output , 24 btes
0 0utput error
It can be known from the above information.( Choose one or more )

A) The tunnel interface is in the UP state, and the MTU is 1476 bytes
B) The Keeplive function is enabled on the tunnel interface .Once the router does not receive the Keeplive message from the other party within 30s , the tunnel is considered unavailable.Although the tunnel interface is still in the UP state, the tunnel interface is a static route for the outgoing interface Will disappear from the routing table ;
C) tunnel channel source lP address 192.1.1.1
D) tunnel channel does not start verification, verification can not start

3. Regarding the echo in the VoIP telephone system, which of the following descriptions are correct ?

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.

4. Which of the following statements about the improvement of ADSL2 relative to ADSL is correct: ( Choose one or more )

A) Compared with ADSL, ADSL2 adds a new operating mode
B) ADSL can support flexible bandwidth binding function, such as IMA ( Inverse Multiplexing forATM , ATM inverse multiplexing )
C) At the same transmission rate, ADSL2 can transmit longer distances than ADSL
D) The frequency band of ADSL2 is twice that of ADSL

5. In BGP MPLS VPN networking, where will the private network label exist in the following locations ?

A) In the private network packet forwarded by the PE to the P device
B) Private network routing between PE and CE
C) Private network routing between PEs
D) In the private network packet forwarded by PE to CE

Solutions: