In the PE on rub see a VPN private network table, can be found through the through MP-BGP routing protocol has learned the end VPN private network by a user, but this time to check the PE at even CE provided apparatus routing table, but It is found that the private network route cannot be learned .Which of the following reasons may be ____ ?

MPLS penultimate hop technology reduces _______ packet forwarding complexity.

Ethernet 1000BASE-T cable uses a standard _____ most large transmission distance is ______ .

In the Ethernet access application, the correct statement about the deployment of the access point AN and the aggregation equipment AGG at the edge of the operator's access network is ____ .

The three routers shown in FIG., In Routerl and Router3 between creating built GRE tunnel , three routers are configured to :
[Routerl]interface Serial 0/2/0
[Routerl-Serial0/2/0]ip address 10.1.1.1 24
[Routerl]interface loopback 0
[Routerl-LoopBack0]ip address l.1.1.1 32
[Routerl]interface Tunnel 0
[Routerl-Tunnel0]source 1 0.1.1.1
[Routerl-Tunnel0]destination 20.1.1.2
[Routerl-Tunnel0]ip address 100.1.1.1 24
[Routerl]ospf
[Routerl-ospf-l]area 0
[Routerl-ospf-l-area-0.0.0.0]network 10.1.1.1 0.0.0.255
[Routerl-ospf-l-area-0.0.0.0]network l.1.1.1 0.0.0.0
Router2:
[Router2]interface Serial 0/2/0
[Router2-Serial0/2/0]ip address 10.1.1.2 24
[Router2]interface Serial 0/2/1
[Router2-Serial0/2/1]ip address 20.1.1.1 24
[Router2]ospf
[Router2-ospf-l]area 0
[Router2-ospf-l-area-0.0.0.0] network 10.1.1.2 0.0.0.255
[Router2-ospf-l-area-0.0.0.0] network 20.1.1.1 0.0.0.255
Router3:
[Router3]interface Serial 0/2/0
[Router3-Serial0/2/0]ip address 20.1.1.2 24
[Router3-Serial0/2/0]quit
[Router3]interface loopback 0
[Router3-Loop Back0]ip address 3.3.3.3 32
[Router3]interface Tunnel 0
[Router3-Tunnel0]source 20.1.1.2
[Router3-Tunnel0]destination 10.1.1.1
[Router3-Tunnel0]ip address 100.1.1.2
[Router3]ospf
[Router3-ospf-l]area 0
[Router3-ospf-l-area-0.0.0.0] network 20.1.1.2 0.0.0.255
[Router3-ospf-l-area-0.0.0.0]network 3.3.3.3 0.0.0.0
Use the command ping-a 1.1.1.1 3.3.3.3 on the Router to check the connectivity, l00% received icmp reply packets.
In the process of upward progress, the following describes the processing of data packets by each router.The correct one is _____ .( Choose one or more )