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Huawei H12-831_V1.0 (HCIP-Datacom-Advanced Routing & Switching Technology V1.0) Exam is a professional-level certification exam offered by Huawei Technologies Co. Ltd. H12-831_V1.0 exam is designed for individuals who possess advanced knowledge and skills in the field of routing and switching technologies. The HCIP-Datacom-Advanced Routing & Switching Technology V1.0 Exam is a comprehensive exam that covers a wide range of topics related to advanced routing and switching technologies, including routing protocols, switching technologies, network security, and network management.
Huawei H12-831_V1.0 Exam covers a range of topics related to advanced routing and switching technologies, including advanced IP routing, MPLS VPN technologies, BGP, OSPF, IS-IS, QoS, security, and high availability. H12-831_V1.0 exam is designed to test the candidate's understanding of the concepts and principles of advanced routing and switching technologies, as well as their ability to apply this knowledge to real-world scenarios.
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Huawei H12-831_V1.0 (HCIP-Datacom-Advanced Routing & Switching Technology V1.0) Certification Exam is a professional certification offered by Huawei Technologies Co., Ltd. Huawei is a Chinese multinational technology company that specializes in telecommunications equipment and consumer electronics. HCIP-Datacom-Advanced Routing & Switching Technology V1.0 certification is designed for professionals who want to demonstrate their expertise in advanced routing and switching technologies.
NEW QUESTION # 130
On an enterprise network shown in the figure, if CE2 is dual-homed to PE2 and PE3, a routing loop may occur during the exchange of Type 5 LSAs (External LSAs in OSPF).
To prevent the loop, the route-tag command can be run on PE2 and PE3.
In this way, if the route tag of the route received by PE3 is the same as that configured locally, the route is ignored.
Is this statement True or False?
Answer: B
Explanation:
Comprehensive and Detailed In-Depth Explanation:
1. Understanding the Issue of OSPF Type 5 LSAs in a Dual-Homed CE Scenario
* OSPF Type 5 LSAs (External LSAs) are used in OSPF to advertise external routes, such as those learned via BGP or redistributed from another protocol.
* In a dual-homed CE setup, like the one in the figure, CE2 connects to both PE2 and PE3 using OSPF.
* PE2 and PE3 both redistribute BGP routes into OSPF and advertise them to CE2.
* CE2 then forwards these LSAs between PE2 and PE3, potentially causing a routing loop because each PE may re-learn its own previously advertised routes.
2. How Route Tags Prevent Loops in OSPF-BGP Redistribution
* The route-tag command assigns a tag to redistributed routes.
* When a router receives an external OSPF LSA (Type 5), it checks the route tag.
* If the route tag matches the locally configured tag, the router ignores the route to prevent loops.
Example Configuration on PE Routers:
plaintext
CopyEdit
PE2:
router ospf 1
import-route bgp 100 route-tag 65001
PE3:
router ospf 1
import-route bgp 100 route-tag 65001
* Both PE2 and PE3 tag their redistributed BGP routes with 65001.
* If PE3 receives an LSA from CE2 with the tag 65001, it ignores it (because it knows it originally advertised it).
# This prevents OSPF from incorrectly preferring a route that was originally sourced from itself, avoiding routing loops.
3. Evaluating the Answer Choices
# TRUE: If the route tag of the received route matches the locally configured tag, the route is ignored, preventing loops.
# FALSE: The statement is correct, so False is incorrect.
Thus, the correct answer is: A. TRUE
Final Conclusion:
# The statement is TRUE because route tagging is a valid method to prevent OSPF Type 5 LSA loops in dual- homed scenarios.
Reference:
HCIP-Datacom-Advanced Routing & Switching Technology V1.0 - OSPF Route Redistribution and Route- Tagging Huawei Official HCIP-Datacom Study Guide - Preventing OSPF-BGP Loops in MPLS VPNs Huawei Documentation on Using Route Tags to Prevent OSPF Routing Loops
NEW QUESTION # 131
As shown in the figure, OSPF is enabled on all interfaces of the router. Which of the following statements is correct?
Answer: B
NEW QUESTION # 132
On the OSPF network shown in the figure, area 1 and area 2 are common areas . The IP address of Loopback0 on R5 is 10.0.5.5/32 , and OSPF is enabled on this interface . If the abr-summary 10.0.5.0
255.255.255.0 command is run in area 2 (where R1 resides) , which of the following routers have the route
10.0.5.0/24 in their routing tables?
Answer: A,B
Explanation:
Comprehensive and Detailed In-Depth Explanation:
Step 1: Understanding OSPF Areas and Summarization
* Loopback0 on R5 has IP 10.0.5.5/32 and is advertised into OSPF.
* The abr-summary 10.0.5.0 255.255.255.0 command is applied in area 2 on R1 , which means:
* Instead of advertising individual host routes (like 10.0.5.5/32), R1 advertises the summarized route 10.0.5.0/24 into Area 0 (Backbone) .
* This summarized route is then propagated into other areas via Area 0 (Backbone) .
Step 2: Analyzing the Routing Table of Each Router
* R5 (Originating Router in Area 2)
* R5 only knows 10.0.5.5/32 because it ' s the originating router.
* The abr-summary command does not affect R5 itself.
* # R5 does not have 10.0.5.0/24.
* R1 (ABR for Area 2, Summarizing the Route)
* R1 creates and advertises 10.0.5.0/24 into Area 0 .
* This summary route is sent to other areas via Area 0.
* R2 (Connected to Area 0 & Area 1)
* Since R2 is part of Area 0 (Backbone), it receives 10.0.5.0/24 from R1 .
* # R2 has 10.0.5.0/24 in its routing table.
* R3 (Connected to Area 0 & Area 2)
* Since R3 is also connected to Area 0, it receives the summary route 10.0.5.0/24 from R1 .
* # R3 has 10.0.5.0/24 in its routing table.
* R4 (In Area 1, which is not directly connected to Area 2)
* R4 belongs to Area 1 , and unless explicitly advertised through inter-area summarization, it will not have 10.0.5.0/24 .
* Since no specific mention of summary advertisement into Area 1 is made, R4 does not get
10.0.5.0/24 .
* # R4 does not have 10.0.5.0/24.
Final answer: # R2, R3 (Option B, C)
References:
HCIP-Datacom-Advanced Routing & Switching Technology V1.0 - OSPF Route Summarization OSPF Inter-Area Route Advertisement via ABRs OSPF Backbone (Area 0) Behavior and Route Distribution
NEW QUESTION # 133
On the OSPFv3 network shown in the figure, the LSDB (Link-State Database) of R2 contains ______ Router-LSAs . (Enter only digits.)
Answer:
Explanation:
3
Explanation:
1. Understanding Router-LSAs in OSPFv3
* Router-LSA (Type 1 LSA) is generated by every OSPFv3 router to describe its own links and connected networks within the same area.
* Each router in an OSPF area generates exactly one Router-LSA to advertise its own topology information.
* Router-LSAs are flooded throughout the area but do not cross area boundaries.
2. Analyzing the Given OSPFv3 Network
* The topology consists of three routers: R1, R2, and R3 , all connected in OSPFv3 Area 0 .
* Since all three routers participate in OSPFv3 , each router generates its own Router-LSA (Type 1 LSA) .
* R2, as an OSPF router, will have its own Router-LSA and also receive the Router-LSAs from R1 and R3 .
3. Counting the Number of Router-LSAs in R2's LSDB
* R1 generates 1 Router-LSA (for itself).
* R2 generates 1 Router-LSA (for itself).
* R3 generates 1 Router-LSA (for itself).
* Total Router-LSAs in R2's LSDB = 3 (one from each router).
Final answer:
HCIP-Datacom-Advanced Routing & Switching Technology References:
* OSPFv3 LSA Types and Their Roles
* Understanding Router-LSA (Type 1) and Its Function in LSDB
NEW QUESTION # 134
BGP/MPLS IP VPNs can only use LDP to construct public network tunnels.
Answer: A
NEW QUESTION # 135
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