Huawei exams4sure pass H12-821_v1 0 Exam Guide by Lucie q30 vce pdf

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Exam Name:	HCIP-Datacom-Core Technology V1.0
Exam Code:	H12-821_V1.0 Dumps
Vendor:	Huawei	Certification:	HCIP-Datacom
Questions:	382 Q&A's	Shared By:	lucie

Question 92

On a broadcast IS-IS network shown in the following figure, a DIS needs to be elected to create and update pseudonodes. Which of the following routers is elected as the DIS?

Questions 92

Options:

Discussion

Question 93

Typically, a protocol that occupies two ports during communication is called a multi-channel protocol. For such protocols, the ASPF function must be enabled on the firewall to ensure smooth setup of the data channel and reduce the risk of attacks. Which of the following protocols is not a multi-channel protocol?

Options:

FTP

SIP

SMTP

H.323

Discussion

Question 94

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.

Discussion

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., ]

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Question 95

In BGP, the MED attribute is transmitted only between two neighboring ASs. The AS that receives the MED attribute does not advertise it to a third AS. By default, a router compares only the MED values of BGP routes from the same neighboring AS. That is, if two routes to the same destination are from different neighboring ASs, the router does not compare the MED values of the two routes.

Options:

TRUE

FALSE

Discussion

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