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| Section | Objectives |
|---|---|
| IP Network Technologies | - IS-IS Routing Protocol
|
| Advanced Routing Protocols | - OSPF Advanced Features
|
| MPLS and VPN Technologies | - VPN Implementation
|
| Network Design and Troubleshooting | - Enterprise Network Design
|
| Network Services and Optimization | - QoS Fundamentals
|
>> Useful H12-831_V1.0-ENU Dumps <<
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NEW QUESTION # 13
As shown in the figure, an administrator enables port isolation on the switch's interfaces connected to terminals.
In this scenario, which of the following IP addresses cannot be pinged from PC1?
Answer: A,C
Explanation:
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.
Reference:
HCIP-Datacom-Advanced Routing & Switching Technology V1.0 - Port Isolation and VLAN Behavior Huawei Official HCIP-Datacom Study Guide - Port Isolation and Layer 3 Switch Configuration Huawei Documentation on Port Isolation in VLANs
NEW QUESTION # 14
On the network shown in the figure, OSPF runs on R1, R2, and R3, and OSPF BFD is enabled. R1 and R3 use loopback interfaces to establish an iBGP peer relationship. If GE0/0/1 of R2 is shut down, which of the following is the longest period after which the BGP peer relationship of R1 will change from Up to Down?
Answer: A
Explanation:
# Key Facts from the Scenario:
* OSPF runs between R1-R2-R3.
* iBGP peer relationship is established between loopback interfaces of R1 and R3.
* BGP does not detect link failures directly because it runs over loopbacks and relies on the underlying routing protocol (OSPF here).
* BFD (Bidirectional Forwarding Detection) is enabled with OSPF to provide fast failure detection.
# What Happens If GE0/0/1 on R2 Fails?
* The OSPF adjacency between R2 and R3 fails.
* Normally, OSPF would take up to 40 seconds (default dead interval) to detect this.
* However, with BFD enabled, the failure can be detected in as little as 1 second (depending on timers).
* Huawei typically configures BFD with a default detection time of around 3 seconds unless specifically tuned lower.
# Impact on BGP:
* Since the route to R3's loopback disappears quickly due to BFD detection, R1 loses the next-hop reachability to R3.
* As a result, the iBGP session between R1 and R3 will go Down within approximately 3 seconds.
# Therefore, the maximum period before BGP peering drops is 3 seconds.
# Final Answer: C. 3s
Official Huawei Extract:
" BFD provides fast link failure detection for protocols such as OSPF. When BFD is enabled, the failure detection time can be reduced to milliseconds or a few seconds, allowing upper-layer protocols like BGP to react quickly to routing failures. "
- [Huawei HCIA-Datacom Certification Guide - OSPF Fast Convergence and BFD Integration Chapter]
NEW QUESTION # 15
For the OSPF network shown in the figure, please drag the values on the left to the correct position so that the traffic from PC1 to PC2 is PC1-R1-R3-R2-PC2; the traffic from PC2 to PC1 is PC2-R2-R1-PC1.
Answer:
Explanation:
NEW QUESTION # 16
On the OSPF network shown in the figure, the cost values of links are marked. OSPF IP FRR is enabled on R1, and the maximum load-balancing 8 command is configured in the OSPF process. If a service passes through the path R1 # R5 # R3 to reach 10.0.3.3/32, which of the following is the backup outbound interface for the service?
Answer: A
Explanation:
Comprehensive and Detailed In-Depth Explanation:
Step 1: Identify the Primary Path
* The shortest OSPF cost to 10.0.3.3/32 from R1 is through R5:
* R1 # R5 (Cost 10) # R3 (Cost 10) = Total Cost 20
* The primary outbound interface from R1 to R5 is GE0/0/1.
Step 2: Identify the Backup Path (OSPF IP FRR & ECMP)
* OSPF IP Fast Reroute (FRR) provides a backup next-hop in case the primary link (R1 # R5) fails.
* A feasible backup path must have a cost equal to or close to the primary path, but it must avoid the same failure point.
Alternative Path Calculation:
* Path 1 (R1 # R2 # R3)
* R1 # R2 (Cost 10), R2 # R3 (Cost 10) # Total Cost = 20 #
* Uses interface GE0/0/2 on R1.
* Path 2 (R1 # R4 # R3)
* R1 # R4 (Cost 10), R4 # R3 (Cost 10) # Total Cost = 20 #
* Uses interface GE0/0/3 on R1.
Final Decision on the Backup Interface
* Since both paths R1 # R2 # R3 and R1 # R4 # R3 have equal costs, either can be used for backup.
* However, R1 # R2 # R3 shares a direct cost path with R5, meaning it may not be preferred as a full FRR backup.
* The best backup outbound interface in this scenario is GE0/0/3 (R1 # R4 # R3).
Final Answer: # C (GE0/0/3)
References:
HCIP-Datacom-Advanced Routing & Switching Technology V1.0 - OSPF IP FRR (Fast Reroute) Mechanism OSPF Equal-Cost Multi-Path (ECMP) and Backup Route Selection OSPF Route Calculation and Best-Path Selection
NEW QUESTION # 17
In the OSPF network shown in the figure, area 1 is an NSSA area, area 2 is a common area, and R4 imports the external route 10.0.4.4/32. The Router ID of each device is 10.0.XX, where X is the device number.
The "asbr-summary 10.0.4.0 255.255.255.0" command is configured in the OSPF processes of R1 and R3. Which of the following routers have a route entry for 10.0.4.0/24 in their routing tables? (Multiple choice)
Answer: B,D
NEW QUESTION # 18
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