Use the displa ike peer command to display the following information on the device, and you can know from this information ____ .
KE Peer: 123
exchange mode: aggressive on phase 1
pre-shared-ke simple 123
peer id tpe: name
peer ip address: 10.2.1.1
local ip address:
peer name: aaa
nat traversal: enable
dpd:

• A.During the first phase of IKE negotiation, the initiator sends its name to the peer to identify its identity
• B.The name of the local security gateway during IKE negotiation is aaa
• C.In the IKE negotiation negotiation mode in phase master mode
• D.is not configured for the local security gateway lP address, IKE local gateway negotiation lP address of the interface will use the security policy of the main lP address

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There are ______ methods for user authentication and authorization when logging in to network equipment .

• A.CA certification and authorization
• B.HWTACAC authentication and authorization
• C.RADIUS authentication and authorization
• D.This authenticated authorization

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AAA supports ______ authentication methods.

• A.HWTACACS authorization
• B.RADIUS authorization
• C.This authenticated
• D.Direct access certification

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

• A.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 message
• B.The some SIP message contains one or more message header, used to identify the type of message
• C.There are some special SIP response messages without a start line
• D.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

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

• A.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.
• B.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
• C.In VoIP networks, echo is related to the choice of encoding.The greater the compression ratio, the greater the relative echo in the network.
• 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.

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