Free Huawei H12-221-ENU Exam Dumps Questions & Answers

The following is part of the output information of the router Huawei. For the output information, which description is wrong?
<Huawei> display pim interface gigabitethernet 1/0/0 verbose
VPN-Instance: public net
Interface: GigabitEthernet1/0/0, 10.1.1.1
PIM version:2
PIM mode: Sparse
PIM state: up
PIM DR: 10.1.1.2
PIM DR Priority (configured): 1
PIM neighbor count:1
PIM hello interval: 30 s

• A.The PIM status of the gigabitethernet 1/0/0 interface of the router is UP.
• B.The DR on this interface is 10.1.1.1
• C.PIM-SM running on the gigabitethernet 1/0/0 interface of the router
• D.The router gigabitethernet 1/0/0 interface runs PIMv2

Which are the reasons RSTP converges faster than STP? (Multiple choices)

• A.If a designated port in the network fails, the optimal alternate port in the network becomes the designated port and enters the Forwarding state.
• B.The concept of an edge port was introduced in RSTP. An edge port does not receive processing configuration BPDUs and does not participate in RSTP operations. It can change from Disable to Forwarding state.
• C.In RSTP, after a port is elected as a designated port, it first enters the Discarding state, and then quickly enters the Forwarding state through the Proposal/Agreement mechanism.
• D.When a port receives an RST BPDU from an upstream designated bridge in RSTP, the port compares the stored RST BPDU with the received RST BPDU.
• E.If one of the root ports in the network fails, the optimal alternate port in the network will become the root port and enter the Forwarding state.

In the RSTP protocol, when the network topology changes, which is the mechanism for responding to the topology change?

• A.Partial deletion of the MAC address table
• B.Modify the lifetime of the MAC address table
• C.Flooding across the entire network
• D.Delete the entire MAC address table

MSTP solves a lot of defects of RSTP and STP single spanning tree. As for the description of MSTP, the correct ones are:

• A.By default, all VLANs are mapped to MST Instance 1.
• B.Each MST instance uses a separate STP algorithm to compute a separate spanning tree.
• C.MSTP allows one or more VLANs to be mapped to an MST instance. MSTP calculates the root switch for each MST instance and sets the port status.
• D.Each MST Instance has an identifier (MSTID), and the MSTID is a one-byte integer.

Which of the following description about the routing policy supported by OSPF route filtering is wrong?

• A.route-policy
• B.as-path filter
• C.access-list
• D.prefix-list