Huawei H12-821_V1.0 Exam Questions Free Practice Test

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Questions # 21:

Which of the following statements regarding multicast MAC addresses are false?

Options:

One multicast MAC address maps to 32 multicast IP addresses.

One multicast MAC address maps to only one multicast IP address.

The high 24 bits of the multicast MAC address are 0x01005E, the 25th bit is fixed to 1, and the lower 23 bits of the MAC address map to the lower 23 bits of the multicast IP address.

A multicast MAC address identifies receivers of a multicast group on the data link layer.

Expert Solution

Questions # 22:

According to BGP route selection rules, the route with the higher Local_Pref is preferred.

Options:

TRUE

FALSE

Expert Solution

Questions # 23:

On an OSPF network, an algorithm is used to prevent loops within an area, but loops may occur between areas. Therefore, OSPF defines a loop prevention mechanism for inter-area routes. Which of the following statements are true about the loop prevention mechanism?

Options:

Inter-area routes cannot be directly transmitted between non-backbone areas.

All non-backbone areas must be directly connected to area 0.

Inter-area routes need to be forwarded through area 0.

An ABR cannot inject Type 3 LSAs that describe routes to a network segment in an area back to the same area.

Expert Solution

Answer

A, B, C, D

Explanation

 OSPF Area Design and Loop Prevention :

OSPF uses a hierarchical structure with areas to improve scalability and efficiency. Area 0, the backbone area, plays a crucial role in ensuring loop-free route distribution between areas. The following mechanisms are key to preventing routing loops:

Strict adherence to hierarchical area design.

Prohibition of direct inter-area route exchanges between non-backbone areas.

[: HCIP-Datacom-Core Technology Training Material (OSPF Basics and Advanced Concepts).,  Analysis of Each Statement:, A. Inter-area routes cannot be directly transmitted between non-backbone areas.This statement is TRUE. OSPF mandates that all inter-area routing must pass through Area 0. Direct inter-area route exchanges between two non-backbone areas are not allowed to prevent loops., Reference: HCIP-Datacom-Core Technology Training Material (Inter-Area Routing Mechanisms)., B. All non-backbone areas must be directly connected to area 0.This statement is TRUE. OSPF requires every non-backbone area to connect directly to Area 0 to facilitate loop-free inter-area routing. Virtual links may be configured in exceptional cases where direct connection is not possible., Reference: HCIP-Datacom-Core Technology Training Material (OSPF Backbone and Area Connectivity)., C. Inter-area routes need to be forwarded through area 0.This statement is TRUE. All inter-area traffic must traverse Area 0 to ensure hierarchical routing and loop prevention. This rule is a core design principle of OSPF., Reference: HCIP-Datacom-Core Technology Training Material (Routing Control and Loop Prevention in OSPF)., D. An ABR cannot inject Type 3 LSAs that describe routes to a network segment in an area back to the same area.This statement is TRUE. OSPF explicitly prohibits an ABR from injecting Type 3 LSAs describing a route into the same area where the route originates. This mechanism prevents routing loops within an area., Reference: HCIP-Datacom Advanced Routing & Switching Technology (OSPF LSA Types and ABR Behavior).,  Conclusion:All options (A, B, C, D) are correct. OSPF enforces a robust loop prevention mechanism through hierarchical routing, mandatory traversal via Area 0, and strict rules on LSA propagation by ABRs. This ensures reliable and loop-free inter-area routing in OSPF networks., ]

Questions # 24:

iMaster NCE-Fabric networks. It helps customers improve service efficiency from multiple dimensions. Which of the following functions is not supported by the controller?

Options:

Management

Control

Forwarding

Analysis

Expert Solution

Questions # 25:

Similar to the OSPF DR, the IS-IS DIS needs to be elected on a broadcast network. However, the OSPF DR is preemptive by default, whereas the IS-IS DIS is not preemptive by default.

Options:

TRUE

FALSE

Expert Solution

Questions # 26:

The traffic limiting policy feature only supports the number of connections initiated by the specified IP or the number of connections received.

Options:

TRUE

FALSE

Expert Solution

Questions # 27:

As shown in the figure, data traffic is forwarded in tunnel mode along the path of STA - > HAP - > HAC - > upper-layer network before roaming. What is the flow direction of data traffic after Layer 3 roaming?

Options:

STA - > FAP - > FAC - > HAC - > HAP - > HAC - > Upper-layer network

STA - > FAP - > FAC - > HAC - > Upper-layer network

STA - > FAP - > FAC - > Upper-layer network

STA - > FAP - > FAC - > HAC - > HAP - > Upper-layer network

Expert Solution

Questions # 28:

The BFD (Bidirectional Forwarding Detection) state machine implements a three-way handshake for BFD session setup or teardown . Which of the following session states are involved in BFD session setup?

Options:

AdminDown

Init

Down

Expert Solution

Questions # 29:

When deploying BFD, you need to adjust some parameters so that it can better detect the network status. Which of the following statements is false about BFD optimization?

Options:

After a high priority is configured for BFD packets, BFD packets are preferentially forwarded.

To quickly learn about the network status and performance requirements, you can set the interval for sending BFD packets to the minimum value.

On a live network, some devices switch traffic only when a BFD session changes to the Up state. If a routing protocol goes Up later than an interface, no route is available for switching traffic back, leading to traffic loss. To resolve this issue, configure a delay to compensate for the time difference caused when the routing protocol goes Up later than the interface.

If a BFD session flaps, master/backup switchovers are frequently performed on the application associated with the BFD session. To prevent this, set the WTR time of the BFD session.

Expert Solution

Answer

Questions # 30:

On an OSPF network, if a router receives an update of an LSA that exists in the local LSDB, the router updates the LSDB and floods the LSA.

Options:

TRUE

FALSE

Expert Solution

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