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These Huawei H12-831_V1.0-ENU practice tests simulate the real HCIP-Datacom-Advanced Routing & Switching Technology V1.0 (H12-831_V1.0-ENU) exam pattern, track your progress, and help you overcome mistakes. Our HCIP-Datacom-Advanced Routing & Switching Technology V1.0 (H12-831_V1.0-ENU) desktop software is compatible with Windows. Whereas, the web-based Huawei H12-831_V1.0-ENU Practice Exam works online on iOS, Linux, Android, Windows, and Mac. Additionally, the web-based HCIP-Datacom-Advanced Routing & Switching Technology V1.0 (H12-831_V1.0-ENU) practice exam is also compatible with MS Edge, Internet Explorer, Opera, Firefox, Safari, and Chrome.
| Section | Objectives |
|---|---|
| Topic 1: BGP and Internet Routing | - BGP fundamentals
|
| Topic 2: Network Design and Troubleshooting | - Enterprise network design
|
| Topic 3: Advanced Routing Protocols | - OSPF Advanced Concepts
|
| Topic 4: MPLS and VPN Technologies | - MPLS fundamentals
|
| Topic 5: IPv6 and Network Services | - IPv6 routing technologies
|
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NEW QUESTION # 197
R1 forwards the packet with the destination IP address of 4.4.4.4 on an MPLS network. Some LSP information of R3 is shown in the figure. During packet transmission, which of the following devices perform MPLS label operations?
Answer: A,B,C
Explanation:
# MPLS Domain Path Summary:
* Ingress: R1
* Transit: R2 # R3
* Egress: R4
* Destination IP: 4.4.4.4 (Loopback of R4)
MPLS Label Operations by Device:
# R1 (Ingress LSR)
# Push operation
* R1 assigns an MPLS label (1025) to the IP packet before forwarding it to R2.
* Label is determined using LDP or RSVP, depending on protocol used (LDP in this case).
# R2 (Transit LSR)
# Swap operation
* R2 swaps label 1025 with 1026 before sending to R3.
* Transit routers perform label swapping using the MPLS forwarding table.
# R3 (Transit LSR)
# Swap or Pop operation
* According to the LSDB output:
mathematica
CopyEdit
In-Label: 1026
Out-Label: 3
Label 3 is the implicit null label , which means R3 pops the label before forwarding to R4.
So, R3 performs a Pop operation .
# R4 (Egress LSR)
# No label operation
* R4 receives a pure IP packet (label was popped by R3).
* Egress LSR does not perform MPLS operations -it simply routes the packet using IP.
# Final answer: A, C, D
Official Huawei Extract:
" In an MPLS network, the ingress LSR pushes the label, transit LSRs swap the label, and the egress LSR receives an IP packet after the last label is popped. If the outgoing label is 3 (implicit null), the penultimate router performs PHP (penultimate hop popping). "
- [Huawei HCIA-Datacom Guide - MPLS Label Operations Chapter]
NEW QUESTION # 198
On the ISIS network shown in the figure, R1 imports a default route using the default-route-advertise always level-1 command. In this case, R3 can learn this default route through IS-IS.
Answer: B
NEW QUESTION # 199
Network engineers can determine whether the link connection is normal by observing the interface indicators of the NetEngine AR6120 on site, but cannot determine whether the interface is configured with an IP address.
Answer: A
NEW QUESTION # 200
MPLS is called multi-protocol label switching. Which description is correct about the label in MPLS? (Multiple choice)
Answer: A,C,D
NEW QUESTION # 201
On the OSPFv3 network shown in the figure, area 1 is an NSSA. R1 imports the external route 2000::1/128 to OSPFv3. Which of the following LSAs are available in area 0?
Answer: B,D
Explanation:
Comprehensive and Detailed In-Depth Explanation:To determine which LSAs are available in Area 0, we need to analyze the OSPFv3 network, the area types, and the behavior of external routes in an NSSA, considering the possibility of multiple correct answers. Let's break it down step by step:
* Understanding the Network and Area Types:
* The network has two areas: Area 0 (backbone area) and Area 1 (Not-So-Stubby Area or NSSA).
* R1, located in Area 1, imports an external IPv6 route (2000::1/128) into OSPFv3.
* Area 0 is the backbone area, and Area 1 is an NSSA, which allows limited external routes but has specific restrictions on LSA types.
* OSPFv3 LSA Types and Their Roles:
* Link-LSA (Type 8): These are link-local LSAs, flooded only within the local link and not propagated beyond the local segment. They are not flooded into Area 0 or other areas, so they are not relevant for inter-area or external route advertisement.
* Inter-Area-Router-LSA (Type 4): These LSAs are used to describe routers in other areas, specifically Autonomous System Boundary Routers (ASBRs) that originate external routes. In this case, R1 is an ASBR in Area 1 (NSSA) importing the external route 2000::1/128. Type 4 LSAs are generated by the ABR (e.g., R1 or another router connecting Area 1 to Area 0) and flooded into Area 0 to provide reachability information to the ASBR (R1) for the external route.
Therefore, Inter-Area-Router-LSAs can be present in Area 0 to help routers reach R1 as the ASBR.
* Intra-Area-Prefix-LSA (Type 9): These LSAs advertise prefixes associated with routers or transit networks within the same area. They are not used for external routes and are confined to Area 1, so they are not available in Area 0.
* Inter-Area-Prefix-LSA (Type 3): These LSAs advertise prefixes from one area to another, including routes summarized or redistributed into the OSPF domain. In an NSSA, external routes (like 2000::1/128) are advertised as Type 7 LSAs within Area 1. The ABR (e.g., R1 or another router) translates these Type 7 LSAs into Type 5 LSAs or, in OSPFv3, they may be represented as Inter-Area-Prefix-LSAs (Type 3) to flood the external route into Area 0. Thus, Inter-Area- Prefix-LSAs are available in Area 0 for the external route 2000::1/128.
* Behavior of External Routes in an NSSA:
* In OSPFv3, an NSSA (like Area 1) allows external routes to be imported by an ASBR (R1 in this case). NSSAs do not flood Type 5 LSAs (external LSAs) directly into the area. Instead, external routes are advertised as Type 7 LSAs within the NSSA.
* The Area Border Router (ABR) connecting the NSSA (Area 1) to the backbone (Area 0)-likely R1 or another router-translates the Type 7 LSAs into Type 5 LSAs (or, in OSPFv3, they may be represented as Inter-Area-Prefix-LSAs or other appropriate LSAs for external routes). These translated LSAs are then flooded into Area 0.
* Additionally, since R1 is an ASBR, Area 0 needs to know how to reach R1 to access the external route 2000::1/128. This is achieved through Inter-Area-Router-LSAs (Type 4), which are flooded into Area 0 by the ABR to describe the location of the ASBR (R1) in Area 1.
* Determining LSAs Available in Area 0:
* Link-LSA (Type 8): These are link-local and not flooded into Area 0, so they are not available in Area 0.
* Inter-Area-Router-LSA (Type 4): Since R1 is an ASBR in Area 1 (NSSA) importing the external route, the ABR (e.g., R1 or another router) generates Inter-Area-Router-LSAs to advertise R1's location to Area 0. This LSA is necessary for routers in Area 0 to reach the ASBR (R1) for the external route 2000::1/128. Therefore, Inter-Area-Router-LSAs are available in Area
0.
* Intra-Area-Prefix-LSA (Type 9): These are confined to Area 1 and not flooded into Area 0, so they are not available in Area 0.
* Inter-Area-Prefix-LSA (Type 3): This LSA is used to advertise the external prefix 2000::1/128 into Area 0 after translation from Type 7 LSAs in Area 1. Therefore, Inter-Area-Prefix-LSAs are available in Area 0.
* Conclusion:
* The external route 2000::1/128, imported by R1 in Area 1 (NSSA), results in both Inter-Area- Router-LSAs (Type 4) and Inter-Area-Prefix-LSAs (Type 3) being available in Area 0.
* Inter-Area-Router-LSA (Type 4) is present to describe the location of the ASBR (R1) in Area 1, allowing routers in Area 0 to reach R1 for the external route.
* Inter-Area-Prefix-LSA (Type 3) is present to advertise the external prefix 2000::1/128 into Area 0 after translation from the Type 7 LSA in Area 1.
* Therefore, the correct answers are B (Inter-Area-Router-LSA) and D (Inter-Area-Prefix-LSA).
References (Based on HCIP-Datacom-Advanced Routing & Switching Technology Concepts):
* OSPFv3 LSA Types: HCIP-Datacom documentation on OSPFv3 LSAs, including Link-LSA, Inter- Area-Router-LSA, Intra-Area-Prefix-LSA, and Inter-Area-Prefix-LSA (e.g., Section on OSPFv3 Fundamentals).
* NSSA Behavior in OSPFv3: HCIP-Datacom coverage of NSSA areas, Type 7 LSAs, and their translation to Type 5 or Inter-Area-Prefix-LSAs for Area 0, as well as Inter-Area-Router-LSAs for ASBR reachability (e.g., Chapter on OSPFv3 Advanced Features and Area Types).
* External Route Propagation: HCIP-Datacom explanation of external route handling in OSPFv3, including ASBR and ABR roles, and LSA types for inter-area and external route advertisement (e.g., Section on Route Redistribution and IPv6 OSPF).
NEW QUESTION # 202
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