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

Comprehensive and Detailed In-Depth Explanation:

The Link Layer Discovery Protocol (LLDP) is used for discovering neighboring devices. The given LLDP output contains key details about the neighboring device (R2), including its system name, interface, and management IP address. Let's analyze each option carefully:

Option A: "The sysname of the peer device is R2." ✅ Correct

The output clearly shows System name: R2, which confirms that the neighbor's system name is indeed R2.

Option B: "The interface number of the peer device is GE0/0/0." ✅ Correct

The Port ID in the LLDP output is GE0/0/0, which matches the statement in Option B.

Option C: "The VLAN ID of the peer device is 1." ❌ Incorrect

The given LLDP output does not mention any VLAN ID information. Therefore, this option is false.

Option D: "The management IP address of the peer device is 192.168.1.1." ✅ Correct

The Management address field in the LLDP output confirms the IP address as 192.168.1.1, making this statement true.

HCIP-Datacom-Advanced Routing & Switching Technology References:

Huawei HCIP-Datacom Official Certification Guide, Chapter on LLDP and Network Device Discovery.

HCIA/HCIP Datacom Training Materials – LLDP Neighbor Discovery Commands.

Huawei Datacom Configuration Guide – Section on display lldp neighbor interface.

Comprehensive and Detailed In-Depth Explanation:

Understanding Port Isolation in the Network

Network Setup Details:

The switch is Layer 3, with VLANIF10 configured as 10.1.1.1/24 (gateway for all PCs).

All PCs are in VLAN 10 and use 10.1.1.1 as the default gateway.

Port isolation is enabled on switch interfaces, dividing them into two groups:

Group 1 (PC1 & PC2): GigabitEthernet0/0/1 and GigabitEthernet0/0/2

Group 2 (PC3 & PC4): GigabitEthernet0/0/3 and GigabitEthernet0/0/4

Port Isolation Behavior:

Ports within the same isolation group CAN communicate with each other.

Ports from different isolation groups CANNOT communicate directly.

All devices CAN still communicate with the L3 switch (10.1.1.1), which acts as the gateway.

Ping Analysis from PC1 (10.1.1.2)

Destination IP

Device

Connected Port

Isolation Group

Ping Result from PC1

10.1.1.3

PC2

GigabitEthernet0/0/2

Group 1

✅ Can Ping

10.1.1.4

PC3

GigabitEthernet0/0/3

Group 2

❌ Cannot Ping

10.1.1.5

PC4

GigabitEthernet0/0/4

Group 2

❌ Cannot Ping

10.1.1.1

L3 Switch (Gateway)

N/A

Not Isolated

✅ Can Ping

Which IPs Cannot be Pinged from PC1?

PC3 (10.1.1.4) and PC4 (10.1.1.5) are in a different isolation group (Group 2), so PC1 cannot reach them directly.

PC2 (10.1.1.3) is in the same isolation group (Group 1), so PC1 can ping it.

PC1 can ping the gateway (10.1.1.1) because the switch is Layer 3 and forwards traffic.

Thus, the correct answers are: A. 10.1.1.3 and D. 10.1.1.4.

Final Conclusion:

✅ PC1 CAN ping:

10.1.1.3 (PC2, same isolation group)

10.1.1.1 (Gateway, L3 Switch)

❌ PC1 CANNOT ping:

10.1.1.4 (PC3, different isolation group)

10.1.1.5 (PC4, different isolation group)

Thus, the correct answer is: A. 10.1.1.3 and D. 10.1.1.4.

Comprehensive and Detailed In-Depth Explanation:

1. Understanding Site of Origin (SoO) in MPLS VPNs

SoO (Site of Origin) is used in MPLS VPNs to prevent loops in multi-homed CE scenarios.

Routes with the same SoO value are not advertised back to the same site.

2. Analysis of Each Answer Choice

A. "To enable CE3 to receive the route, run the command peer 10.1.1.1 soo 200:1 on PE1." (❌ False)

SoO is used to prevent loops by tagging routes that belong to the same site.

Applying SoO (200:1) on PE1 for CE1 means that any other PE (such as PE2) receiving the route will not advertise it back to the same site (CE1).

This statement is false because applying SoO here does not directly enable CE3 to receive the route. Instead, CE3 must accept routes with SoO values properly configured.

B. "If the commands peer 10.1.1.1 soo 200:1 and peer 10.1.2.1 soo 200:1 are run on PE1, CE2 accepts the route." (❌ False)

SoO ensures that a route received from one CE is not sent back to another CE in the same site.

If SoO (200:1) is assigned to CE1 and CE2, routes will be blocked because they share the same SoO tag.

Thus, CE2 will not accept the route, making this statement false.

C. "If the command peer 10.1.3.1 substitute-as is run on PE2, CE3 accepts the route." (✅ True)

substitute-as allows a router to replace the received AS number in the AS_PATH with another AS number, ensuring that routes are accepted even when AS_PATH filtering is in place.

This prevents CE3 from rejecting the route due to AS-Path loop prevention.

✅ Thus, this statement is true.

D. "If no additional action is taken, CE3 discards the route." (✅ True)

By default, CE3 will discard the route because of BGP loop prevention (same AS in the AS_PATH).

To allow CE3 to receive the route, the allowas-in or substitute-as command must be configured on PE2.

✅ Thus, this statement is true.

3. Evaluating the Answer Choices

Option

Correct?

Reasoning

A

❌ False

Applying SoO does not directly enable CE3 to receive the route.

B

❌ False

If both CE1 and CE2 have the same SoO value, CE2 will reject the route.

C

✅ True

Substitute-AS allows CE3 to accept the route by modifying the AS-Path.

D

✅ True

Without additional configuration, CE3 will discard the route due to AS-Path loop prevention.

✅ Correct Answer: A and B are false.

Final Conclusion:

SoO prevents routing loops in MPLS VPN multi-homing.

CE2 will reject the route if it has the same SoO as CE1.

CE3 requires the substitute-as or allowas-in command to accept the route.

Thus, statements A and B are false.