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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: MPLS Technologies | 19% | - MPLS LDP and TE - MPLS VPN basics |
| Topic 2: Network Cutover | 7% | - Rollback procedures - Migration planning techniques |
| Topic 3: Network O&M | 7% | - Monitoring and health metrics - Operation & maintenance best practices |
| Topic 4: Advanced IGP Features | 17% | - OSPF advanced capabilities - IS-IS advanced optimisations |
| Topic 5: IPv6 Routing | 20% | - OSPFv3/IS-IS for IPv6 - IPv6 static and dynamic routing |
| Topic 6: Advanced BGP Features | 10% | - Route reflector and attributes - BGP policy controls |
| Topic 7: Advanced Ethernet Technologies | 10% | - MAC/security features - VLAN and Ethernet enhancements |
| Topic 8: Troubleshooting | 10% | - Issue resolution strategies - Network diagnostics |
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質問 # 52
The Router ID of R1 is 10.0.1.1. In the LSDB of R1, the LSA shown in the figure is seen. The network engineer makes the following inferences based on the LSA. Which one is wrong?
正解：A
質問 # 53
Which of the following statements about MUX VLANs are true?
正解：A、C、D
質問 # 54
In the OSPF network shown in the figure, R1 and R2 achieve intercommunication through Loopback0 interface through OSPF.
At the same time, R1 and R2 have enabled the MPLS LDP function, and the LDP transmission address is the IP address of the Loopback0 interface. The network engineer found that R1 and R2 could not establish an LDP session, so he first executed the command shown in the figure on R2. Based on this, which of the following reasons may cause the failure of establishing an LDP session between R1 and R2? (Multiple choice)
正解：A、D
質問 # 55
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?
正解：A、C
解説：
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
質問 # 56
On the network shown in the figure, EBGP peer relationships are established between ASs through directly connected interfaces.
* OSPF is deployed in AS 65456 (with OSPF disabled on interconnected interfaces between ASs).
* R4 and R5 use Loopback0 to establish iBGP peer relationships with R6.
* The IP address of Loopback0 on each router is 10.0.X.X/32, and the router ID is 10.0.X.X, where X is the number of the router.
* R1, R2, and R3 import the external route 192.168.1.0/24 into BGP through the import-route command.
Which of the following statements are true?
正解：B、C
解説：
Comprehensive and Detailed In-Depth Explanation:
Understanding the BGP and OSPF Network Topology in the Question:
* External Route Importation
* R1, R2, and R3 import 192.168.1.0/24 into BGP from an external source.
* This means R1, R2, and R3 will advertise this route to their EBGP and iBGP peers.
* BGP Route Selection Criteria
* BGP follows specific rules to determine the best path for a route. The most relevant factors here are:
* Highest Local Preference (LOCAL_PREF) # Preferred
* Shortest AS Path # Preferred
* Lowest Origin Type (IGP < EGP < Incomplete) # Preferred
* Lowest MED (Multi-Exit Discriminator) # Preferred
* Oldest eBGP route (if paths are equal) # Preferred
Route Selection Analysis for Each Statement:
A: For 192.168.1.0/24, R5 preferentially selects the route received from R2. # (Correct)
* R5 is in AS 65456 and peers with R6 using iBGP.
* Since R2 is a central router with direct connectivity to R5, it is the most preferred path compared to indirect paths from R1 or R3.
* By default, R5 will prefer the path from R2 over others unless explicitly influenced by BGP attributes.
# Statement A is correct.
B: For 192.168.1.0/24, R4 preferentially selects the route received from R1. # (Incorrect)
* R4 and R5 use Loopback0 to establish iBGP with R6, meaning they receive BGP routes from multiple sources.
* BGP prefers the shortest AS path, and there is no specific information indicating that R1's path is the shortest for R4.
* R4 may actually prefer another router's advertisement (e.g., R2 or R3) depending on AS path length and other attributes.
# Statement B is incorrect.
C: For 192.168.1.0/24, if the default local-preference 150 command is configured on R3, R5 preferentially selects the route received from R3. # (Correct)
* By default, BGP assigns a local-preference of 100.
* If R3 sets local-preference to 150, it is higher than other routes (R1, R2).
* BGP prefers the highest local-preference value, so R5 will prefer the route received from R3 if this attribute is set.
# Statement C is correct.
D: For 192.168.1.0/24, R6 preferentially selects the route received from R4. # (Incorrect)
* R6 is an iBGP peer of both R4 and R5.
* BGP best-path selection depends on attributes like local-preference, AS-path, and MED.
* There is no explicit information suggesting that R4's advertisement is preferred over R5's.
* R6 may prefer R5's route depending on attributes.
# Statement D is incorrect.
Final Conclusion:
# A. R5 preferentially selects the route received from R2.# B. R4 does not necessarily prefer R1's route.
# C. If R3 sets local-preference 150, R5 will prefer the route from R3.# D. R6 does not necessarily prefer R4's route.
Thus, the correct answers are: A, C.
質問 # 57
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