Huawei H31-161 Exam Dumps

Which of the following combinations of LDP working modes supports LDP FRR?

A. Downstream independent label distribution + ordered label control + free label retentionB.Downstream on-demand label distribution + independent label control + free label retention

B. Downstream independent label distribution + independent label control + conservative label retention

C. Downstream on-demand label distribution + ordered label control + conservative label retention

Refer to the exhibit.

As shown in the figure, PE 1 sets up an MP-IBGP neighbor relationship with PE 2 and they communicate over MPLS LDP. A CE communicates with a PE over OSPF. Configure the VRF on PE 1 as follows: ip vpn-instance vrf1 route-distinguisher 100:1 vpn-target 1:1 export-extcommunity vpn-target 1:1 import-extcommunityConfigure OSPF on PE 1 as follows: ospf 1 vpn-instance vrf1 area 0.0.0.0 network 100.1.1.0 0.0.0.255

Configure BGP on PE 1 as follows:

bgp 100

peer 22.22.22.22 as-number 100

peer 22.22.22.22 connect-interface LoopBack0

#

ipv4-family unicast

undo synchronization

peer 22.22.22.22 enable

#

ipv4-family vpnv4

policy vpn-target

peer 22.22.22.22 enable

#

ipv4-family vpn-instance vrf1

import-route ospf 1

PE 2 has the same configurations as PE 1. MP-IBGP neighbor relationships have been set up between

PEs, and OSPF neighbor relationships have been set up between PEs and CEs. A valid route 1.1.1.1/32 is

imported from CE 1 to an OSPF area, but CE 1 does not learn the route.

What is the reason?

A. CE cannot be connected to a PE through OSPF.

B. CE can be connected to a PE through OSPF only when the PE also runs OSPF.

C. An RD is shared by VRFs on PE 1 and PE 2.

D. BGP routes must be imported to OSPF areas on a PE.

In PIM-DM, which of the following scenarios about sending Join messages is true?

A. The leaf router in the idle state receives host Join messages.

B. The router receives prune messages of the RPF neighbor from other routers when it is receiving data from the upstream.

C. The intermediate router receives graft messages from the downstream router when all downstream interfaces of the intermediate router are in the prune state.

D. The router receives state-refresh messages.