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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Network Troubleshooting | 10% | - Routing protocol fault diagnosis - Switching and link fault handling - Performance and service fault resolution - Structured troubleshooting methodology |
| Topic 2: MPLS Technologies | 19% | - MPLS fundamentals and label distribution - LDP and RSVP-TE protocols - MPLS VPN (L3VPN, L2VPN) - MPLS OAM and protection |
| Topic 3: Advanced BGP Features | 10% | - Routing policies and filtering - Route reflectors and confederations - BGP route selection and attributes - BGP multi-homing and load balancing |
| Topic 4: Network O&M | 7% | - Network monitoring and performance analysis - Configuration management and backup - Routine maintenance procedures - Log and alarm management |
| Topic 5: Advanced Ethernet Technologies | 10% | - VLAN aggregation and MUX VLAN - Port isolation and security features - QinQ and VLAN mapping - Ethernet link aggregation and reliability |
| Topic 6: Network Cutover | 7% | - Cutover planning and risk assessment - Post-cutover validation - Implementation and rollback strategy - Pre-cutover verification |
| Topic 7: Advanced IGP Features | 17% | - OSPF advanced features
|
| Topic 8: IPv6 Routing | 20% | - IPv6 address planning and configuration - Transition mechanisms (dual-stack, tunnel, translation) - BGP4+ for IPv6 - OSPFv3 and IS-IS for IPv6 |
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NEW QUESTION # 138
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 # 139
A large-scale BGP network has a large number of peers. Configuring and maintaining these peers is difficult. You can add the BGP peers with the same configurations to a BGP peer group and then configure the BGP peers in batches to simplify peer management and improve route advertisement efficiency. When configuring an IBGP peer group, you do not need to specify an AS number for the peer group. When configuring an EBGP peer group, you must specify an AS number for the peer group.
Answer: B
Explanation:
In Huawei's implementation of BGP peer groups , the goal is to ease configuration in large-scale BGP deployments. When you define a peer group , all peers within that group inherit common settings.
* For IBGP peer groups , since the peers are in the same AS , you do not need to specify an AS number.
* For EBGP peer groups , since the peers are in different ASes , you must specify the AS number during peer group configuration.
# Official Reference from Huawei:
" When configuring an IBGP peer group, the AS number does not need to be specified because all members belong to the same AS. However, when configuring an EBGP peer group, the peer AS must be explicitly specified. "
- [Huawei HCIA-Datacom Certification Guide - BGP Chapter]
NEW QUESTION # 140
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 does not exist in area 1?
Answer: B
Explanation:
Comprehensive and Detailed In-Depth Explanation:In OSPFv3, Link State Advertisements (LSAs) are used to describe the network topology and routing information. The behavior of LSAs in different area types, such as Not-So-Stubby Areas (NSSAs), is critical to understanding this question. Let's break it down step by step:
* Understanding Area 1 as an NSSA:
* An NSSA (Not-So-Stubby Area) is a special type of OSPF area that allows the importation of external routes (Type 7 LSAs, also known as NSSA LSAs) while preventing the flooding of AS- External LSAs (Type 5 LSAs) from other areas into the NSSA. This is done to reduce the amount of routing information within the area while still allowing limited external route advertisement.
* In an NSSA, external routes (like the one imported by R1, 2000::1/128) are advertised as Type 7 LSAs within the NSSA and are translated into Type 5 LSAs by the Area Border Router (ABR) when they need to be advertised into other areas (e.g., the backbone area, Area 0). However, Type 5 LSAs (AS-External-LSAs) are not flooded into the NSSA itself.
* Analyzing the LSAs in the Options:
* A. Inter-Area-Prefix-LSA: These LSAs (Type 3 LSAs in OSPFv3) are used to advertise prefixes between areas. In an NSSA, Inter-Area-Prefix-LSAs can exist because they are used by the ABR to summarize and advertise routes from other areas (like Area 0) into Area 1. Therefore, this LSA exists in Area 1.
* B. NSSA LSA: These are Type 7 LSAs in OSPFv3, specific to NSSAs. They are used to advertise external routes (like the 2000::1/128 route imported by R1) within the NSSA. Since Area 1 is an NSSA and R1 is importing an external route, NSSA LSAs exist in Area 1.
* C. Intra-Area-Prefix-LSA: These LSAs (Type 1 and Type 2 LSAs, or their OSPFv3 equivalents) are used to advertise prefixes within the same area. In Area 1, Intra-Area-Prefix- LSAs exist to describe the internal topology and prefixes of Area 1, so this LSA is present.
* D. AS-External-LSA: These are Type 5 LSAs in OSPFv3, used to advertise external routes throughout the OSPF domain (outside the autonomous system). However, in an NSSA, Type 5 LSAs are not flooded into the area to keep it stubby-like. Instead, external routes are advertised as Type 7 LSAs (NSSA LSAs) within the NSSA and are only converted to Type 5 LSAs by the ABR when exiting the NSSA. Therefore, AS-External-LSAs (Type 5 LSAs) do not exist in Area
1.
* Role of R1 and the External Route:
* R1 is importing the external route 2000::1/128 into OSPFv3, which means it acts as an Autonomous System Boundary Router (ASBR) within Area 1. As an ASBR in an NSSA, R1 advertises this external route as a Type 7 LSA (NSSA LSA) within Area 1. This Type 7 LSA is then translated by the ABR (if R1 is not the ABR, or by another ABR in Area 1) into a Type 5 LSA for advertisement into other areas (e.g., Area 0). However, the Type 5 LSA (AS-External- LSA) does not exist within Area 1 itself, as NSSAs block Type 5 LSAs.
* Conclusion:
* Given that Area 1 is an NSSA, and Type 5 LSAs (AS-External-LSAs) are not flooded into NSSAs, the AS-External-LSA does not exist in Area 1. All other LSAs (Inter-Area-Prefix-LSA, NSSA LSA, and Intra-Area-Prefix-LSA) can exist in Area 1 based on the topology and the role of R1 as an ASBR.
Therefore, the correct answer is D, as AS-External-LSAs do not exist in Area 1.
References to HCIP-Datacom-Advanced Routing & Switching Technology Documents:
* HCIP-Datacom-Advanced Routing & Switching Technology V1.0, Section on OSPFv3: OSPF Area Types and LSA Types (specifically NSSA behavior, Type 5 and Type 7 LSAs).
* HCIP-Datacom-Advanced Routing & Switching Technology V1.0, Chapter on OSPF Routing Protocols: LSAs in Different Area Types and External Route Handling.
NEW QUESTION # 141
On the IS-IS IPv6 network shown in the figure:
* Multi-topology is enabled on all routers.
* The IPv6 address of Loopback0 on R4 is 2000::4/128.
* The command ipv6 summary 2000::/64 level-2 is configured in the IS-IS processes of R2 and R1.
* The command ipv6 import-route isis level-2 into level-1 is configured in the IS-IS processes of R1, R2, and R3.
Which of the following routers have the route 2000::/64 in their routing tables?
Answer: C,D
Explanation:
Comprehensive and Detailed In-Depth Explanation:
Understanding the IS-IS Network and IPv6 Route Summary Behavior
* IS-IS Areas and Router Roles:
* Area 49.0001 (Level-1-2): R1, R2, R4
* Area 49.0002 (Level-1-2 & Level-1): R3 (Level-1-2), R5 (Level-1 only)
* Effect of ipv6 summary 2000::/64 level-2 Command
* This command on R1 and R2 summarizes the 2000::/64 prefix for Level-2 routers.
* Instead of advertising the detailed 2000::4/128 prefix, R1 and R2 advertise only the summarized
2000::/64 route to other Level-2 routers.
* Effect of ipv6 import-route isis level-2 into level-1 Command
* This command allows Level-1 routers (like R3) to learn Level-2 routes (like 2000::/64).
* R1 and R2 redistribute the 2000::/64 summary route into Level-1 IS-IS areas, making it available to Level-1 routers.
Route Distribution Analysis for Each Router
R4 (Does Not Have 2000::/64) #
* R4 only advertises its Loopback0 (2000::4/128).
* It does not need to install the summarized 2000::/64 route, as it originates from its own loopback.
# R4 does NOT have the 2000::/64 route.
R5 (Does Not Have 2000::/64) #
* R5 is a Level-1-only router in Area 49.0002.
* It does not have a Level-2 connection to learn the summarized 2000::/64 route.
* Because R5 is Level-1 only, it can only receive routes if a default route is provided, which is not mentioned in the question.
# R5 does NOT have the 2000::/64 route.
R3 (Has 2000::/64) #
* R3 is a Level-1-2 router, meaning it can learn both Level-1 and Level-2 routes.
* Since R1 and R2 advertise the summarized 2000::/64 route into Level-2 and R3 has ipv6 import-route isis level-2 into level-1, R3 will install 2000::/64 in its routing table.
# R3 has the 2000::/64 route.
R2 (Has 2000::/64) #
* R2 is a Level-1-2 router and has the ipv6 summary 2000::/64 level-2 command enabled.
* This means R2 advertises the summarized 2000::/64 route to other Level-2 routers and installs it in its own routing table.
# R2 has the 2000::/64 route.
Final Conclusion:
# R3 has the route 2000::/64.
# R2 has the route 2000::/64.
# R4 does NOT have the route 2000::/64.
# R5 does NOT have the route 2000::/64.
Thus, the correct answers are: C. R3, D. R2.
Reference:
HCIP-Datacom-Advanced Routing & Switching Technology V1.0 - IS-IS Route Summarization and IPv6 Multi-Topology Huawei Official HCIP-Datacom Study Guide - IS-IS L1/L2 Routing and IPv6 Summarization Commands Huawei Documentation on IPv6 Route Summary Behavior in IS-IS
NEW QUESTION # 142
As shown in the figure, a certain park has deployed IPv6 for service testing, and there are 4 routers in the network. Run OSPFv3 to realize network interconnection.
Regarding the LSA generated by the OSPFv3 network, which of the following statements is wrong?
Answer: C
NEW QUESTION # 143
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