In the GRE Tunnel interface view, configure the sending period of Keeplive packets to 10s , and determine the number of transmissions of Keeplive packets required for tunnel interruption to 3 , and the command is ____ .

In VoIP networks, the bandwidth saved by VAD technology is related to which of the following factors ?

The following commands are configured on the S3610 switch:
qos map-table dot1p-lp
import 1 export 5
interface Ethernet1/0/6
port link-mode bridge
port link-tpe trunk
port trunk permit vlan 1 to 2
qos priori4
interface Ethernet1/0/7
port link-mode bridge
port link-tpe trunk
port trunk permit vlan 1 to 2
qos gts queue 5 cir 12600 cbs 2000000
Then when the flow rate is 10Mbps the vlan id is 2 and 802.1p preferred priority of 1 is the packet from the port E1 / 0/6 enters only port E1 / 0/7 when forwarding.Then the following commands are configured on the following switches: the statement is correct

The ZLB ( Zero-Length Bod ) message is a control message with only an L2TP header, and its function is to serve as an explicit response to ensure reliable delivery of the control message.
In the following four cases, LNS does not send ZLB message to LAC as a response: ____ .

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