H12-831_V1.0 Exam Dumps : HCIP-Datacom-Advanced Routing & Switching Technology V1.0

OSPFv3 uses Router-LSAs to describe the routing topology of individual routers within an OSPF area.

Each OSPFv3 router originates a Router-LSA for every area to which its OSPFv3 interfaces belong. Router-LSAs contain information about link types, interface identifiers, neighboring routers, and link costs.

In the displayed topology, R1, R2, and R3 all participate in OSPFv3 Area 0. Because Router-LSAs have area flooding scope, each participating router receives the Router-LSAs generated by the other routers in that area.

Consequently, R2 ' s Area 0 link-state database contains Router-LSAs originated by R1, R2, and R3.

The three routers form one common OSPFv3 area, and no additional area or router is shown.

Therefore, the total number of Router-LSAs in the relevant LSDB is 3.

HCIP-Datacom-Advanced Routing & Switching Technology V1.0 Training Material.pdf

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Comprehensive and Detailed In-Depth Explanation:

1. Understanding the Network Setup

PC1 (192.168.1.1/24) and PC2 (192.168.1.2/24) are connected to SW1.

Both PCs are in the same VLAN, meaning communication should work without routing.

If there is a communication failure, it could be due to physical, VLAN, ARP, or port security issues.

2. Evaluating Each Answer Option

Option A: " SW1’s GE0/0/2 is shut down. "

Correct.

If GE0/0/2 is shut down, PC2 cannot send or receive traffic, causing communication failure.

Even if PC1 is working, PC2 will be unreachable.

✅ A is a valid cause.

Option B: " The link of SW1’s GE0/0/1 is faulty. "

Correct.

If GE0/0/1 has a faulty link, PC1 cannot communicate with PC2, causing failure.

Even if PC2 is working, PC1 will be unreachable.

✅ B is a valid cause.

Option C: " Incorrect static ARP entries are configured on the hosts. "

Correct.

If static ARP entries are incorrectly configured, PCs will map the wrong MAC addresses to IPs.

This will result in packet delivery failures, even if the physical network is working.

✅ C is a valid cause.

Option D: " Port isolation is configured on SW1. "

Correct.

Port isolation (or private VLAN) prevents direct communication between specific ports.

If port isolation is enabled on GE0/0/1 and GE0/0/2, PC1 and PC2 will be unable to reach each other.

✅ D is a valid cause.

Final Answer:

✅ A, B, C, and D are correct.

HCIP-Datacom-Advanced Routing & Switching Technology References:

Troubleshooting VLAN and Layer 2 Communication Issues

Impact of Port Isolation and Private VLANs on Communication

Static ARP Entry Configuration and Its Effects on Network Connectivity

Comprehensive and Detailed In-Depth Explanation:

Understanding the network connectivity:

R1 and R2 are connected through 10.0.12.0/24 and running OSPF in Area 0.

PC1 (192.168.1.11/24) is connected to R1, and PC2 (192.168.1.12/24) is connected to R2.

Analyzing each option:

Option A: " R2 cannot ping 10.0.12.1. " ❌ Incorrect

R2 is directly connected to 10.0.12.1/24 (R1) on GE0/0/0, so it can ping this IP without any routing issues.

Option B: " PC1 and PC2 cannot ping each other. " ✅ Correct

OSPF is only running between R1 and R2. There is no indication that R1 and R2 are redistributing connected routes (192.168.1.0/24 and 192.168.1.0/24) into OSPF.

As a result, R1 does not know how to reach 192.168.1.12, and R2 does not know how to reach 192.168.1.11, making communication between PC1 and PC2 impossible.

Option C: " R1 cannot ping 192.168.1.2. " ❌ Incorrect

192.168.1.2 is directly connected to R2, and if R1 can reach R2 through OSPF, then R1 should be able to ping 192.168.1.2.

Option D: " R1 cannot ping 192.168.1.12. " ✅ Correct

192.168.1.12 is connected to R2, but if R2 does not advertise this network to R1, R1 has no route to reach it.

Since PC1 (192.168.1.11) and PC2 (192.168.1.12) are on different subnets, and there ' s no redistribution, R1 cannot reach PC2 ' s IP.

Key Takeaways and Fix Recommendations:

To allow PC1 and PC2 to communicate, R1 and R2 must advertise their directly connected networks (192.168.1.0/24) in OSPF using the network command or by redistributing connected routes into OSPF.

Command example:

makefile

CopyEdit

R1:

router ospf 1

network 192.168.1.0 0.0.0.255 area 0

R2:

router ospf 1

network 192.168.1.0 0.0.0.255 area 0

This would allow R1 to learn about PC2 ' s network and R2 to learn about PC1 ' s network, enabling communication.

HCIP-Datacom-Advanced Routing & Switching Technology References:

HCIP-Datacom Official Certification Guide, Chapter on OSPF Network Design and Troubleshooting.

Huawei Datacom Training Materials, Section on OSPF Inter-Area and External Route Advertisements.

Huawei Datacom Configuration Guide, Command Reference for OSPF network advertisement and route redistribution.