H12-821_V1.0 Exam Dumps - HCIP-Datacom-Core Technology V1.0

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Question # 33

On an enterprise network, the directly connected interfaces of two OSPF routers are on different network segments and have different masks. To establish an OSPF neighbor relationship between the two interfaces, you can change their network types to which of the following?

Point-to-point

NBMA

P2MP

Broadcast

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Question # 34

Preferences of routing protocols determine the sequence In which a router selects a route among routes to the same destination /earned through different routing protocols.

TRUE

FALSE

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Question # 35

When two BGP peers support different Hold Time, they will negotiate to support the shortest Hold Time interval they can support.

TRUE

FALSE

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Question # 36

In the OSPF protocol, intra-area route calculation involves only Router LSA, Network LSA, and Summary LSA.

TRUE

FALSE

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Question # 37

Which three transmission modes are supported for IPv4 packets?

Anycast

Broadcast

Unicast

Multicast

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Question # 38

Which of the following statements regarding the LSA age field are true?

The unit of this field is seconds. In a LSDB, the LS age of a LSA increases with time.

If the LS age of a LSA has reached the LSRefreshTime (30 minutes), any router can regenerate an instance of this LSA again.

The unit of this field is seconds. In a LSDB, the LS age of a LSA decreases with time.

If the LS age of a LSA has reached the LSRefreshTime (30 minutes), the originator of this LSA needs to regenerate an instance of this LSA again.

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Question # 39

The filter-policy 2000 export command is run in an ISIS process. Which of the following statements about the functions of a filter policy is false?

Is used together with the route import function to advertise some imported external routes to neighbors.

If this command is not run, the device by default advertises all routes that ISIS Imports form external routing protocols.

Controls the advertisement of routes generated by the device.

Filters LSPs to be advertised.

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Question # 40

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?

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.

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Answer:

Explanation:

ï‚· 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)â€‹â€‹., ï‚· 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)â€‹., 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)â€‹â€‹., 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)â€‹â€‹., 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)â€‹., ï‚· 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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