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

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Question # 105

A BGP device receives a route carrying an unknown attribute from a peer but does not know whether other devices need the attribute. In this case, the BGP device retains this attribute when advertising the route to other peers. Which of the following attributes is of this type?

Community

AS.Path

MED

OriginatorID

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Question # 106

In which of the following scenarios can a neighbor relationship not be established between two directly connected Huawei routers after IS-IS is configured?

The two routers are Level-2 routers with the same area address, and the interfaces connecting them are on the same network segment.

One router is a Level-1 router, and the other router is a Level-2 router.

The two routers are Level-2 routers and have different area addresses.

The two routers are Level-1 routers and have different area addresses.

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Question # 107

On an OSPF network, if two routers with the same router ID run in different areas and one of the routers is an ASBR, LSA flapping occurs.

TRUE

FALSE

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Answer:

Explanation:

ï‚· Understanding Router ID and Its Role in OSPF :

In OSPF, the Router ID uniquely identifies a router within the OSPF domain. If two routers are configured with the same Router ID, it can lead to issues such as LSA conflicts and flapping. This is because the Router ID is used as a key in OSPF operations, including LSA generation and database synchronization.

[: HCIP-Datacom-Core Technology Training Material (OSPF Basics - Router ID and LSA Handling)â€‹., ï‚· Scenario Details:, Different Areas: Even if the two routers belong to different areas, the Router ID remains globally significant in the OSPF domain. This means that any duplication of Router IDs will confuse OSPF mechanisms., ASBR (Autonomous System Boundary Router): When one of the routers is an ASBR, it generates Type 4 and Type 5 LSAs to describe external routes. These LSAs use the Router ID as an identifier. If another router in the network has the same Router ID, conflicts occur during LSDB synchronization., Reference: HCIP-Datacom Advanced Routing & Switching Technology (LSA Types and ASBR Operations)â€‹â€‹., ï‚· Impact of Router ID Duplication:, LSA Flapping: The OSPF process receives conflicting LSAs from routers with the same Router ID. This results in continuous updates and withdrawals of these LSAs, causing flapping., Routing Instability: LSA flapping leads to frequent recalculations of the OSPF shortest path tree (SPT), affecting overall network stability., Reference: HCIE-Datacom V1.0 Training Material (OSPF Troubleshooting and Best Practices)â€‹â€‹., ï‚· Conclusion:, The statement is TRUE. LSA flapping occurs when two routers in an OSPF network have the same Router ID, even if they are in different areas and one is an ASBR. This is due to the global significance of Router IDs in OSPF and the role they play in LSA generation and propagation., ]

Question # 108

Four routers run IS-IS and have established adjacencies. The area IDs and router levels are marked in the following figure. R1 and R2 are connected through a PPP link, and R3 is the DIS. Which of the following statements are true?

If R2 sends a Level-2 LSP, R3 needs to send a PSNP for acknowledgment.

R3 periodically sends CSNPs to implement Level-2 LSDB synchronization.

R2 sends an LSP to R3 and R4 in unicast mode.

If R1 sends an LSP, R2 needs to send a PSNP for acknowledgment.

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Question # 109

To reduce the workload of configuring VPN instances, the administrator can import interface IP addresses and features to the device in batches using a script, and then manually bind the interfaces to VPN instances.

TRUE

FALSE

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Question # 110

If the interval for two consecutive packets of a TCP session reaching the firewall is longer than the aging time of the session, the firewall deletes the session information from the session table to ensure network security.

TRUE

FALSE

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Question # 111

CPU attack defense uses a multi-level security mechanism to implement hierarchical device protection. Match the following levels with the corresponding protection functions.