Execute the  displa interface tunnel  command on a router to display the information of the  GRE  tunnel interface as follows:

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

View Answer

Answer:   AC