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| Section | Weight | Objectives |
|---|---|---|
| Troubleshooting | 10% | - Network diagnostics - Issue resolution strategies |
| Advanced BGP Features | 10% | - Route reflector and attributes - BGP policy controls |
| MPLS Technologies | 19% | - MPLS VPN basics - MPLS LDP and TE |
| Network Cutover | 7% | - Migration planning techniques - Rollback procedures |
| Advanced Ethernet Technologies | 10% | - VLAN and Ethernet enhancements - MAC/security features |
| Advanced IGP Features | 17% | - IS-IS advanced optimisations - OSPF advanced capabilities |
| Network O&M | 7% | - Operation & maintenance best practices - Monitoring and health metrics |
| IPv6 Routing | 20% | - IPv6 static and dynamic routing - OSPFv3/IS-IS for IPv6 |
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問題 #158
On the IS-IS IPv6 network shown in the figure, multi-topology is enabled on all routers. The ipv6 default-route-advertise always level-1 command is configured in the IS-IS process of R4.
Which of the following routers does not have the default route in its routing table?
答案：A
問題 #159
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-1-2 is configured in the IS-IS process of R4 .
Which of the following statements is false ?
答案：A
解題說明：
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-1-2 Command on R4
* Route summarization in IS-IS allows an L1-L2 router (R4) to aggregate IPv6 prefixes and advertise a summary route (2000::/64) into both Level-1 and Level-2 areas.
* This means R4 will advertise only 2000::/64 instead of specific /128 routes (like 2000::4/128).
* All Level-1 and Level-2 routers connected to R4 will receive the summary route 2000::/64 instead of the detailed /128 routes.
Route Distribution Analysis for Each Statement
A). The routing table of R1 contains the route 2000::4/128. # (True)
* R1 is a Level-1-2 router in the same area (49.0001) as R4, so it receives both the summarized
2000::/64 route and the more specific 2000::4/128 route.
* Since R1 is directly connected to R4, it can still learn the 2000::4/128 route.
# Statement A is true.
B). The routing table of R3 contains the route 2000::/64. # (True)
* R3 is a Level-1-2 router, meaning it can receive both Level-1 and Level-2 routes.
* Since R4 (a Level-1-2 router) advertises the summarized 2000::/64 route into both levels, R3 will receive 2000::/64 in its routing table.
# Statement B is true.
C). The routing table of R2 contains the route 2000::/64. # (True)
* R2 is a Level-1-2 router in the same area as R4, meaning it receives the summarized 2000::/64 route.
* This is expected behavior since R4 advertises the summary route into both Level-1 and Level-2 areas.
# Statement C is true.
D). The routing table of R5 does not contain the route 2000::/64. # (False - Correct Answer)
* R5 is a Level-1 router, meaning it can only receive Level-1 routes unless a default route is provided.
* Since R3 (a Level-1-2 router) learns 2000::/64, it can propagate it into the Level-1 area (49.0002).
* This means R5 will receive the summary route 2000::/64 from R3.
* Thus, R5 does contain 2000::/64, making this statement false.
# Statement D is false (correct answer).
Final Conclusion:
# A. The routing table of R1 contains the route 2000::4/128. (True)
# B. The routing table of R3 contains the route 2000::/64. (True)
# C. The routing table of R2 contains the route 2000::/64. (True)
# D. The routing table of R5 does not contain the route 2000::/64. (False - Correct Answer) Thus, the correct answer is: D. The routing table of R5 does not contain the route 2000::/64 (False Statement).
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
問題 #160
On the IS-IS IPv6 network shown in the figure, multi-topology is enabled on all routers .
The ipv6 default-route-advertise always level-1 command is configured in the IS-IS process of R4 .
Which of the following routers does not have the default route in its routing table?
答案：A
解題說明：
Comprehensive and Detailed In-Depth Explanation:
Understanding the IS-IS Network Structure in the Question:
* IS-IS Area IDs and Router Roles
* Area 49.0001 (Level-1-2) : Contains R1, R2, R4 (all Level-1-2 routers).
* Area 49.0002 (Level-1-2 & Level-1) : Contains R3 (Level-1-2) and R5 (Level-1 only) .
* Key Command Used: ipv6 default-route-advertise always level-1
* This command forces R4 to advertise a default route (::/0) to all Level-1 routers within its area .
* Only Level-1 routers in the same area as R4 will receive the default route.
* Level-2 routers do not receive or propagate this default route unless additional configuration is done.
Route Distribution Analysis:
* R4 (Level-1-2) is configured to advertise a default route to Level-1 routers.
* R1 and R2 (both Level-1-2) are in the same area (49.0001) as R4 , so they receive the default route
.
* R3 (Level-1-2) is in area 49.0002 but connects to R4 (49.0001) , meaning it can receive the default route through its Level-1 connection .
* R5 (Level-1 only) is in area 49.0002 , but R4 does not propagate the default route to another Level-
1 area (49.0002) .
* Since R5 is a Level-1 router and does not have a Level-2 connection, it cannot receive the default route from R4 .
Final Conclusion:
# R1 receives the default route.
# R2 receives the default route.
# R3 receives the default route.
# R5 does NOT receive the default route.
Thus, the correct answer is: C. R5 .
Reference:
HCIP-Datacom-Advanced Routing & Switching Technology V1.0 - IS-IS Multi-Topology and IPv6 Routing Huawei Official HCIP-Datacom Study Guide - IS-IS Default Route Advertisement for Level-1 and Level-
2 Areas
Huawei Documentation on ipv6 default-route-advertise always level-1 Command Behavior
問題 #161
As shown in the figure, 0SPF is enabled on all interfaces of the router. The cost value of the link is marked in the figure, R2's LoogbackO is advertised by mouth in area 0, then in In area 1, both R2 and R3 transmit the routing information of 10.0.2.2/32 in the form of Typae3 LSA.
答案：B
問題 #162
As shown in the figure, OSPF is deployed in a campus, and Area 1 is deployed as an NSSA are a. In the case of missing header, R2 will automatically generate a missing header route of Type 7 LSA and flood it in the NSSA area
答案：B
問題 #163
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