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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Advanced Ethernet Technologies | 10% | - VLAN and Ethernet enhancements - MAC/security features |
| Topic 2: Advanced BGP Features | 10% | - Route reflector and attributes - BGP policy controls |
| Topic 3: Network O&M | 7% | - Operation & maintenance best practices - Monitoring and health metrics |
| Topic 4: Advanced IGP Features | 17% | - IS-IS advanced optimisations - OSPF advanced capabilities |
| Topic 5: Troubleshooting | 10% | - Network diagnostics - Issue resolution strategies |
| Topic 6: IPv6 Routing | 20% | - OSPFv3/IS-IS for IPv6 - IPv6 static and dynamic routing |
| Topic 7: MPLS Technologies | 19% | - MPLS LDP and TE - MPLS VPN basics |
| Topic 8: Network Cutover | 7% | - Migration planning techniques - Rollback procedures |
>> H12-831_V1.0 Musterprüfungsfragen <<
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77. Frage
In a campus network using Eth-Trunk with dynamic LACP mode, traffic across bundled interfaces is unevenly distributed. Which factor determines how traffic is load-balanced?
Antwort: A
78. Frage
The figure shows information about VPN1 on a PE (Provider Edge) router in a BGP/MPLS IP VPN network.
When the VPNv4 route corresponding to VPN1 is advertised to the remote PE, which VPNs of the remote PE will accept the route?
VPN1 Configuration:
ip vpn-instance VPN1
ipv4-family
route-distinguisher 100:1
vpn-target 100:1 200:1 300:1 export-extcommunity
VPN Import Policies on the Remote PE:
Antwort: B
Begründung:
Comprehensive and Detailed In-Depth Explanation:
1. Understanding Route Targets (RT) and Route Distribution in MPLS VPN
* MPLS Layer 3 VPNs (L3VPNs) use BGP to distribute VPN routes across multiple Provider Edge (PE) routers.
* Each VPN instance (VRF) is configured with Route Targets (RTs) to control which VPN routes are imported/exported.
* Route Distinguishers (RDs) are unique per VRF but do not affect route selection.
2. Analyzing VPN1 Configuration
* VPN1 is exporting routes with the following Route Targets (vpn-target values):
* 100:1
* 200:1
* 300:1
* Remote VPNs will import these routes only if their import RT list matches one of the exported RTs.
3. Matching Exported RTs with Import RTs in Remote VPNs
Remote VPN
Import RTs
Matches VPN1 Exported RTs (100:1, 200:1, 300:1)?
Accepts the Route?
VPN1
100:1
# Matches 100:1
# Yes
VPN2
200:1, 400:1
# Matches 200:1
# Yes
VPN3
100:1, 300:1
# Matches 100:1, 300:1
# Yes
VPN4
500:1
# No match
# No
# VPN1, VPN2, and VPN3 accept the route.# VPN4 does not accept the route because 500:1 is not in the export list of VPN1.
Final Conclusion:
# Correct answer: VPN1, VPN2, and VPN3 will accept the route.# VPN4 does not accept the route because there is no matching RT.
Thus, the correct answer is:# A. VPN1: Import RT=100:1# B. VPN2: Import RT=200:1, 400:1# C. VPN3:
Import RT=100:1, 300:1# D. VPN4: Import RT=500:1 (No match, does not accept the route).
79. Frage
MPLS determines the upstream and downstream relationships based on the data forwarding direction.
MPLS labeled packets are sent from upstream LSRs and received and processed by downstream LSRs.
Similarly, MPLS labels are distributed from upstream LSRs to downstream LSRs one by one.
Antwort: A
Begründung:
This statement is false due to an incorrect description of how MPLS label distribution works .
* # Upstream/Downstream Relationship: In MPLS, the upstream LSR is the one sending data toward the destination , and the downstream LSR is the one closer to the destination .
* # Incorrect Claim: The statement says " labels are distributed from upstream to downstream " , which is wrong .
# Correct behavior: Labels are distributed from downstream to upstream .
Each LSR advertises a label to its upstream neighbor for a specific FEC (Forwarding Equivalence Class).
This is how Label Distribution Protocol (LDP) works.
# Official Reference from Huawei:
" MPLS labels are distributed from the downstream LSR to the upstream LSR. Data is forwarded from the upstream to the downstream, but labels flow in the opposite direction. "
- [Huawei HCIA-Datacom Guide - MPLS Chapter]
80. Frage
Qing technology is a technology to expand VLAN space. It can achieve the function of expanding Vian space by adding a layer of 8D2.1Q Tag on the basis of 8Q2.12 tag message. Which of the following statements about qinq is false?
Antwort: D
81. Frage
On the OSPF network shown in the figure, area 1 is a common area, area 2 is a stub area, and area 3 is an NSSA. R5 imports an external route 10.0.5.5/32. Given this, which of the following routers does not have the route 10.0.5.5/32 in its routing table?
Antwort: C
Begründung:
Comprehensive and Detailed In-Depth Explanation:
In this OSPF network, we need to determine which router does not have the external route 10.0.5.5/32 in its routing table, based on the area types and OSPF behavior for external routes (Type 5 LSAs). Let's break it down step by step:
* Understanding the Network and Area Types:
* The network has multiple areas: Area 0 (backbone area), Area 1 (common area), Area 2 (stub area), and Area 3 (Not-So-Stubby Area or NSSA).
* Area 0 is the backbone area, connecting all other areas.
* Area 1 is a common (regular) area, which allows all types of LSAs, including external routes (Type 5 LSAs).
* Area 2 is a stub area, which does not allow external routes (Type 5 LSAs) to be propagated into it. Instead, a default route (0.0.0.0/0) is injected by the Area Border Router (ABR) to provide connectivity to external destinations.
* Area 3 is an NSSA, which allows limited external routes (Type 7 LSAs, translated to Type 5 LSAs by the ABR) but can block Type 5 LSAs depending on configuration. However, NSSAs typically allow external routes originated within the NSSA to be advertised into Area 0 and other areas.
* External Route Behavior (10.0.5.5/32):
* R5, located in Area 3 (NSSA), imports an external route 10.0.5.5/32. In an NSSA, external routes are advertised as Type 7 LSAs within the NSSA and are translated to Type 5 LSAs by the ABR (e.g., R1 or another router connecting Area 3 to Area 0) before being flooded into Area 0 and other areas.
* Type 5 LSAs (external routes) are flooded throughout the OSPF domain, except into stub areas and, in some cases, NSSAs (depending on configuration). However, stub areas block Type 5 LSAs entirely, replacing them with a default route.
* Analyzing Each Router's Area and Route Propagation:
* R1: Located in Area 0, R1 is an ABR connecting Area 0 to other areas (e.g., Area 1 and Area 3).
As an ABR, R1 receives the Type 7 LSA from R5 in Area 3, translates it to a Type 5 LSA, and floods it into Area 0 and other connected areas (except stub areas). Therefore, R1 will have the route 10.0.5.5/32 in its routing table.
* R2: Located in Area 0, R2 is also in the backbone area and will receive the Type 5 LSA flooded from Area 0. Thus, R2 will have the route 10.0.5.5/32 in its routing table.
* R3: Located in Area 2 (stub area), R3 does not receive Type 5 LSAs because stub areas block external routes. Instead, the ABR (likely R2 or another router connecting Area 2 to Area 0) injects a default route (0.0.0.0/0) into Area 2. Therefore, R3 will not have the specific route
10.0.5.5/32 in its routing table.
* R4: Located in Area 2 (stub area), R4, like R3, is in a stub area and does not receive Type 5 LSAs. It relies on the default route injected by the ABR. Thus, R4 will not have the route 10.0.5.5
/32 in its routing table.
* R5: Located in Area 3 (NSSA), R5 originates the external route 10.0.5.5/32 and advertises it as a Type 7 LSA within Area 3. R5 will have this route in its routing table.
* R6: Located in Area 1 (common area), R6 receives the Type 5 LSA flooded from Area 0 (via R1 or another ABR). Therefore, R6 will have the route 10.0.5.5/32 in its routing table.
* Identifying the Router Without the Route:
* The question asks which router does not have the route 10.0.5.5/32 in its routing table.
* R3 and R4 are both in Area 2 (stub area), which blocks Type 5 LSAs. Therefore, neither R3 nor R4 will have the route 10.0.5.5/32.
* R6 (Area 1, common area) and R2 (Area 0, backbone) will have the route, as will R1 (Area 0 and ABR) and R5 (Area 3, NSSA, originator).
* The options provided are R6, R3, R4, and R2. Among these, R3 and R4 do not have the route, but we need to select one correct answer from the options. Given the typical focus of such questions on identifying a single router in a stub area, and considering the placement of R4 in the diagram (Area 2), R4 is the most likely answer, as it is clearly in the stub area and isolated from external routes.
* Conclusion:
* R4, located in Area 2 (stub area), does not have the route 10.0.5.5/32 in its routing table because stub areas block Type 5 LSAs, and only a default route is provided by the ABR.
* Therefore, the correct answer is C (R4).
References (Based on HCIP-Datacom-Advanced Routing & Switching Technology Concepts):
* OSPF Area Types: HCIP-Datacom documentation on OSPF area configurations, including stub areas, NSSAs, and common areas (e.g., Section on OSPF LSA Types and Area Restrictions).
* External Route Propagation: HCIP-Datacom coverage of Type 5 and Type 7 LSAs, their flooding behavior, and restrictions in stub and NSSA areas (e.g., Chapter on Advanced OSPF Features).
* ABR and ASBR Roles: HCIP-Datacom explanation of Area Border Routers (ABRs) and Autonomous System Boundary Routers (ASBRs) in OSPF networks (e.g., Section on Route Redistribution and External Route Handling).
82. Frage
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