On a router perform row displa'interface tunnel explicit shown GRE tunnel interface as follows :

On a router perform row displa’interface tunnel explicit shown GRE tunnel interface as follows :

On a router perform row displa’interface tunnel explicit shown GRE tunnel interface as follows :

<Router>displa interface Tunnel 0

Tunnelo current statle: UP

Line protocol current state: UP

Description: Tunnel 0 Interface

T he Maximum transmit Unit is 1476

Internet Addess is 192.1.1.1/24 Primar.

Encapsulation isTUNNELT aggregation ID not- et

Tunnel source l0.1.11.1 destination 10.1.13.1

Tunnel keeepalive enable Period ( 10 s ) , Retries ( 3 )

Tunnel protocol/transport GRE/IP.

GRE key disable

Checksumming of GRE packets disabled

Last 300 seconds input:.0 btes/secl 0 packet/sec.

Last 300 seconds output:..0 bytes/sec , 0 packets/sec.

4 packets input 72bytes.

0 input error

1 packets output , 24 btes

0 0utput error

From the above information, we can know ____ .( Choose one or more )
A . The tunnel interface is in the UP state, and the MTU is 1467 bytes
B . The Keepalive function is enabled on the Tunnel interface .Once the router fails to receive the Keeplive packets from the other party within 30s , the tunnel is considered unavailable
C . tunnel track start validation, verification does not start
D . tunnel channel source lP address of 10.1.11.1