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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Bearer WAN Planning and Deployment | 15% | - SR (Segment Routing)
|
| Topic 2: WAN Interconnection Network Planning and Deployment | 8% | - Inter-AS VPN
|
| Topic 3: Advanced Routing and Switching Technology | 37% | - IS-IS
|
| Topic 4: Network Automation | 17% | - iMaster NCE
|
| Topic 5: Campus Network Planning and Deployment | 23% | - Network Services
|
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NEW QUESTION # 307
The following statement about ISIS (IPv6) is correct?
Answer: A,B,D
NEW QUESTION # 308
What can be determined from the following figure?
Answer: D
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 # 309
In a VXLAN scenario, which of the following features can be enabled to reduce ARP packet flooding between VTEPs?
Answer: B,C,D
Explanation:
VXLAN networkssuffer from ARP floodingbecause ARP requests arebroadcasted across all VTEPsin a Layer
2 domain. Toreduce ARP flooding, the following mechanisms can be enabled:
#A. Local Proxy ARP
Allows the local VTEP to respond to ARP requests without forwarding them across the VXLAN network.
The VTEPcaches MAC-IP mappingsand replies directly to ARP requests, reducing unnecessary flooding.
#B. ARP Broadcast Suppression
Converts ARP broadcast packets into unicast or multicast packetsto minimize network-wide flooding.
#C. Host Information Collection
Collects and stores MAC-IP bindings of endpoints, which can be used by proxy ARP to reduce flooding.
#D. Port Isolation
Port isolation prevents communication between devices within the same VLANbut doesnot help reduce ARP floodingbetween VTEPs.
Reference from Huawei HCIE-Datacom Documentation:
Huawei VXLAN Configuration Guide - ARP Optimization Techniques
HCIE-Datacom Training Material - Reducing ARP Broadcasts in VXLAN Networks
NEW QUESTION # 310
OSPF is a mature protocol and is unlikely to have route computation errors in a regular networking environment under correct configurations. Which of the following statements are correct about the possible causes preventing an OSPF neighbor relationship from entering Full state?
Answer: A,B,C,D
Explanation:
ForOSPF neighbors to reach Full state, they must exchangeLSAs (Link State Advertisements) properlyand synchronize their databases.
Possible Causes Preventing OSPF from Entering Full State:
#A. A link works abnormally
If thephysical or Layer 2 linkis unstable,OSPF Hello packetsmay be lost, preventing the Full state.
#B. The OSPF network types on both ends of the link are inconsistent
OSPF network types (Broadcast, P2P, NBMA, etc.) must matchon both ends.
Example: If one router isP2Pand the other isBroadcast, adjacency issues occur.
#C. The router IDs of neighbors are the same
Router ID conflicts prevent OSPF adjacencies from forming.
Each router must have aunique Router ID.
#D. The OSPF MTU values of interfaces on both ends of the link are different If MTU settings do not match,OSPF Database Description (DD) packets may be dropped, preventing Full state.
Reference from Huawei HCIE-Datacom Documentation:
Huawei OSPF Configuration Guide - Troubleshooting OSPF Neighbor Issues
HCIE-Datacom Study Material - OSPF Adjacency and Route Synchronization
NEW QUESTION # 311
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 # 312
......
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