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NEW QUESTION # 254
What can be determined from the following figure?
Answer: B
Explanation:
To determine R3's role (Level-1, Level-2, or Level-1-2) based on the provided output of the display ipv6 routing-table protocol isis command on R3, we need to analyze the IS-IS routing information and understand IS-IS hierarchy and behavior, particularly in the context of IPv6 routing. Let's break it down step by step:
Understanding the IS-IS Levels and Hierarchy:
IS-IS (Intermediate System to Intermediate System) is a link-state routing protocol that supports a two-level hierarchy:
Level-1: Routers within the same area, responsible for intra-area routing. Level-1 routers only maintain routing information for their area and rely on Level-1-2 routers to reach other areas.
Level-2: Routers that form the backbone, connecting different areas for inter-area routing. Level-2 routers maintain routing information across areas.
Level-1-2: Routers that operate both at Level-1 (within their area) and Level-2 (to connect to other areas). These routers act as boundary routers between Level-1 areas and the Level-2 backbone.
A router's role (Level-1, Level-2, or Level-1-2) determines which types of adjacencies it can form and what routing information it advertises or receives.
Analyzing the Output:
The output shows R3's IPv6 routing table with routes learned via IS-IS, specifically:
Destination: 2082:EDFC:DDCC::B824:0/127, Protocol: ISIS-L1
This route is learned via IS-IS Level-1 (ISIS-L1), indicating that R3 has a Level-1 adjacency and is receiving or advertising routes within its area.
The next hop (FE80::2E0:FCFF:FE45:6A3E) and interface (GigabitEthernet0/0/0) suggest this route is intra-area.
Destination: 2082:EDFC:DDCC::B891:0/127, Protocol: ISIS-L2
This route is learned via IS-IS Level-2 (ISIS-L2), indicating that R3 has a Level-2 adjacency and is receiving or advertising routes for inter-area or backbone routing.
The next hop (FE80::2E0:FCFF:FE50:406F) and interface (GigabitEthernet0/0/1) suggest this route is for a different area or the backbone.
Both Level-1 and Level-2 routes are present in R3's routing table, which provides critical insight into R3's role.
Determining R3's Role:
Level-1 Routers:
Level-1 routers only participate in Level-1 adjacencies and maintain routing information for their area. They do not have Level-2 routes or adjacencies unless connected to a Level-1-2 router. Since R3 has a Level-2 route (ISIS-L2), it cannot be exclusively a Level-1 router.
Level-2 Routers:
Level-2 routers focus on inter-area routing and typically do not maintain Level-1 routes unless they are also configured as Level-1-2. Since R3 has a Level-1 route (ISIS-L1), it cannot be exclusively a Level-2 router.
Level-1-2 Routers:
Level-1-2 routers operate both at Level-1 (for intra-area routing) and Level-2 (for inter-area routing). They can form adjacencies with both Level-1 and Level-2 neighbors and maintain both types of routes. The presence of both ISIS-L1 and ISIS-L2 routes in R3's routing table indicates that R3 is participating in both Level-1 and Level-2 adjacencies, making it a Level-1-2 router.
Evaluating Each Option:
A . R3 must be a Level-2 device.
This is incorrect because R3 has ISIS-L1 routes, indicating it is also participating in Level-1 adjacencies, which Level-2-only devices do not do. Level-2 devices focus solely on inter-area routing and do not maintain Level-1 routes.
B . The device role of R3 cannot be determined.
This is incorrect because the presence of both ISIS-L1 and ISIS-L2 routes in the routing table clearly indicates R3's role. The combination of Level-1 and Level-2 routes confirms R3 is a Level-1-2 router.
C . R3 must be a Level-1-2 device.
This is correct. The routing table shows both ISIS-L1 (Level-1) and ISIS-L2 (Level-2) routes, meaning R3 is operating as both a Level-1 and Level-2 router, which defines a Level-1-2 device.
D . R3 must be a Level-1 device.
This is incorrect because R3 has ISIS-L2 routes, indicating it is also participating in Level-2 adjacencies, which Level-1-only devices do not do. Level-1 devices only maintain intra-area routes and rely on Level-1-2 routers for inter-area reachability.
Additional Considerations:
The Flags: D in the output typically indicates a directly connected route or a route downloaded to the forwarding table, but it does not affect the determination of R3's IS-IS level.
The preference (15) and cost (20) are standard for IS-IS routes and do not impact the level determination.
In Huawei's IS-IS implementation, routers can be configured explicitly as Level-1, Level-2, or Level-1-2 using commands like isis level-1-2 under the IS-IS process. The presence of both Level-1 and Level-2 routes confirms R3's configuration as Level-1-2.
Huawei HCIE-Datacom Context:
According to Huawei HCIE-Datacom documentation, IS-IS routers can operate at different levels, and the routing table's protocol type (ISIS-L1 or ISIS-L2) indicates the level of adjacency. A router with both Level-1 and Level-2 routes is necessarily a Level-1-2 device, as it participates in both intra-area and inter-area routing.
The display ipv6 routing-table protocol isis command on Huawei devices shows routes learned via IS-IS, and the protocol type (L1 or L2) directly reflects the router's role in the IS-IS hierarchy.
Conclusion:
Based on the presence of both ISIS-L1 and ISIS-L2 routes in R3's IPv6 routing table, R3 must be a Level-1-2 device, as it is participating in both Level-1 (intra-area) and Level-2 (inter-area) adjacencies. Therefore, the correct answer is C.
References to Huawei HCIE-Datacom Documents:
Huawei HCIE-Datacom V1.0 Training Material, Chapter on IS-IS Configuration and Hierarchy.
Huawei NE Series Router Configuration Guide, IS-IS Section (Level-1, Level-2, and Level-1-2 Operations).
Huawei Technical Whitepaper on IS-IS Protocol, discussing IPv6 Routing and Level Determination.
NEW QUESTION # 255
RTA is the source DR router, RTB is the RP router, and the multicast source sends multicast data to the RTA, but the PIM is not visible on the RTB Register the multicast source to which the message is registered, then the possible causes are ?
Answer: A,B,C,D
NEW QUESTION # 256
Which of the following statements aboutOPS (Open Programmability System) application scenariosisincorrect?
Answer: C
Explanation:
Comprehensive and Detailed In-Depth Explanation:
A). Correct:OPS can use themaintenance assistantto triggerPython scriptsperiodically or based on events.
B). Correct:OPS supportsautomatic deploymentusing Python scripts to download software and configuration files.
C). Incorrect:OPS doesnot inherently provide local storagefor temporarily saving execution results when the network is disconnected. This would require additional programming logic in the script itself, which is not a built-in feature of OPS.
D). Correct:OPS can run scripts toautomatically check device healthand report the status.
Therefore, the incorrect statement isC.
Reference:
Huawei HCIE Datacom Official Certification Guide
Huawei Open Programmability System (OPS) Configuration Guide
NEW QUESTION # 257
When designing IGP routes for an enterprise bearer WAN, ensure that the metric of aggregation-layer links is smaller than that of access-layer links, so that data can be preferentially forwarded over aggregation-layer links.
Answer: B
Explanation:
IGP Metric Design in Enterprise WANs
In anenterprise bearer WAN, routingmetrics determine path selection. Theaggregation layerconnects multiple access-layer devices to the core network, so it should have alower metricto:
#Ensure traffic is forwarded through higher-capacity aggregation links instead of lower-bandwidth access links.
#Optimize traffic flow, reduce congestion, and improve network efficiency.
#Enhance reliability by preferring more stable aggregation links.
IGP Routing Protocols Considerations:
OSPF: Lower cost values indicate preferred paths.
IS-IS: Lower link metrics result in preferred forwarding paths.
Reference from Huawei HCIE-Datacom Documentation:
Huawei IGP Design Guide - Enterprise WAN Routing Optimization
HCIE-Datacom Training Material - Metric Calculation and Path Selection in OSPF/IS-IS
NEW QUESTION # 258
Which of the following items are included in static information collection and analysis?
Answer: A,B
Explanation:
Static information collection and analysis refers to gathering non-changing (static) parameters of the network devices. These parameters are mostly configuration-related and do not fluctuate dynamically.
Explanation of Correct Options:
โ
A. Device types
Includes information about the hardware platform, model, and series of the device.
Example: Huawei NE40E, CE12800, or AR routers.
โ
C. License
Licenses define feature capabilities, such as MPLS, BGP, or security functions.
Licenses are static parameters because they do not change unless manually updated.
Incorrect Options:
โ B. Interface types
Interface types (GigabitEthernet, FastEthernet, Serial, etc.) can change depending on hardware or software configurations.
They are not static because interfaces can be added or removed dynamically.
โ D. Packet loss rate
Packet loss rate is a dynamic parameter, as it varies depending on network conditions, congestion, or faults.
It is used in performance monitoring rather than static data collection.
Reference from Huawei HCIE-Datacom Documentation:
Huawei Network Management Best Practices - Static & Dynamic Data Collection HCIE-Datacom Guide - Network Monitoring and Analysis Huawei NCE-Campus Network Health Check Manual
NEW QUESTION # 259
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