Among the packets encapsulated by the GRE protocol, the payload protocol is the IPX protocol, and the bearer protocol is the IP protocol.The encapsulation sequence of the packet from the link layer to the payload data is ____ .

a - H.323 gateway received when registering with the gatekeeper RCF message stating ____ .

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 ____ .

The information displayed on the MSR router is as follows:
acl number 2000
rule 0 permit source 192.168.0.0 0.0.0.255
acl number 2002
rule 0 permit source 192.168.2.0 0.0.0.255
#
traffic classifier 2 operator and
if-match acl 2002
traffic classifier 1 operator and
if-match acl 2000
#
traffic behavior 2
queue af bandwidth pct 30
traffic behavior 1
queue ef bandwidth pct 30 cbs-ratio 25
#
qos polic test
classifier 1 behavior 1
classifier 2 behavior 2
#
interface GigabitEthernet0/1
port link-mode route
duplex full
speed 10
ip address 192.168.1.1 255.255.255.0
qos appl polic test outbound
When the traffic rate of the packets with the source addresses of 192.168.0.2 , 192.168.2.2 , and 192.168.3.2 are 4Mbps , 4Mbps , 6Mbps , and no other background traffic is forwarded from port G0/1_ .Then the following statement is incorrect is _____

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