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.tunnel channel source lP address 192.1.1.1
• B.The tunnel interface is in the UP state, and the MTU is 1476 bytes
• C.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 ;
• D.tunnel channel does not start verification, verification can not start

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Which of the following descriptions about L2TP tunnel ( Tunnel ) and L2TP session ( Session ) are correct is ____ .( Choose one or more )

• A.The L2TP session must be carried out after the L2TP tunnel is established
• B.L2TP session can be carried out before L2TP tunnel is established
• C.with one pair of LNS and LAC can establish one or more between the L2TP tunnel
• D.with one pair of LNS and LAC can only be established between a L2TP tunnel

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Which of the following codes has the lowest requirement for broadband?

• A.G729
• B.G723
• C.G726
• D.G711

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In the SIP network, which of the following devices belong to UA?

• A.SIP server
• B.language voice gateway
• C.IP phone
• D.connected to a common voice on the gateway PSTN phone

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When the link type of the ONU port is Trunk , its processing method for downstream messages is _____ .

• A.Only allow tagged messages to pass
• B.Only allow the packets with the default VLAN tag to pass and remove the tag
• C.for without receipt of the Tag message, add the default VLAN Tag ; for received with Tag packets forwarded directly
• D.only allowed without Tag packets to pass through, and the packets add the default VLAN of Tag

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