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

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Question # 41

As shown in the figure, SWA, SWB, SWC, and SWD run the Rapid Spanning Tree Protocol (RSTP). Which of the following statements are true?

Once receiving OPOUs, the edge port re-partlci pates in the calculation of the spanning tree.

After a port is Configured as an edge port, the port can quickly enter the Forwarding state.

You can enable the edge port on SWD ' s GEO/0/2 connected to the terminal so that this port can quickly enter the Forwarding state.

You can enable the edge port on SWC ' s GE0/0/2 connected to the terminal so that this port can quickly enter the forwarding state.

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Question # 42

After IPsec is deployed on an enterprise network, services are interrupted. The administrator finds that no data flow triggers IKE negotiation.

Which of the following are possible causes? (Select all that apply)

Configuration error of an interzone security policy

An unreachable route

The IPsec policy is not correctly applied to the related interface.

A mismatch between the ACL and protected data flow

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Question # 43

Which of the following statements regarding the stateful inspection firewall is true?

When the stateful inspection firewall checks packets, packets of one same connection are not correlated.

Because UDP is a connectionless protocol, so the stateful inspection firewall cannot match UDP packets with the status table.

The stateful inspection firewall only needs to match the first data packet against a rule, and the subsequent packets of the connection are matched directly in the state table.

The stateful inspection firewall needs to match the rules for each incoming packet.

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Question # 44

The AS_Path attribute records the numbers of all ASs that a route passes through from the local end to the destination in the vector order. If a BGP speaker advertises a route to an IBGP peer, it creates an empty AS_Path in an Open message. This prevents routing loops between ASs.

TRUE

FALSE

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Question # 45

OSPF has several types of special areas, which are used to reduce the LSDB size and improve device performance.

Which of the following LSAs cannot be in a totally stub area?

Type 3 specific LSA

Type 1 LSA

Type 3 LSA that describes a default route

Type 2 LSA

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Question # 46

On a WLAN, engineers can use the VLAN pool mechanism to assign access users to different VLANs, which helps reduce the number of broadcast domains and improve network performance.

TRUE

FALSE

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Question # 47

BGP itself does not discover routes. Therefore, other routes need to be imported to the BGP routing table for route exchanges between ASs. In import mode, routes are imported to the BGP routing table by protocol. Which of the following routes can be imported to the BGP routing table using the import mode?

Direct routes

Static routes

IS-IS routes

OSPF routes

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Question # 48

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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