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| Section | Weight | Objectives |
|---|---|---|
| MPLS Technologies | 19% | - MPLS VPN basics - MPLS LDP and TE |
| Network Cutover | 7% | - Migration planning techniques - Rollback procedures |
| Advanced BGP Features | 10% | - Route reflector and attributes - BGP policy controls |
| Advanced IGP Features | 17% | - IS-IS advanced optimisations - OSPF advanced capabilities |
| Network O&M | 7% | - Operation & maintenance best practices - Monitoring and health metrics |
| Troubleshooting | 10% | - Issue resolution strategies - Network diagnostics |
| IPv6 Routing | 20% | - OSPFv3/IS-IS for IPv6 - IPv6 static and dynamic routing |
| Advanced Ethernet Technologies | 10% | - MAC/security features - VLAN and Ethernet enhancements |
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NEW QUESTION # 82
There is the concept of forwarding equivalence class FEC in MPLS, which of the following description is wrong? (Multiple choice)
Answer: A,B
NEW QUESTION # 83
In the OSPF network shown in the figure, the cost value of the link is marked in the figure. R1 has enabled OSPP IP FR and configured the "maximum load-balancing 8" command in the OSPF process. Which of the following is the cost value of reaching 10.35.0/24 in R1's routing table?
Answer: A
NEW QUESTION # 84
Which of the following statements about 1S-IS (IPv6) is correct? (Multiple choice)
Answer: A,C,D
NEW QUESTION # 85
When a fault occurs on an OSPF network, traffic can be switched to another path only after several phases. Sort these phases in the correct sequence.
Answer:
Explanation:
Explanation:
When OSPF detects a failure in the network, it performs a series of actions to ensure traffic is rerouted to a valid path. The phases occur in this strict order:
* # Fault Detection (A)
* OSPF routers use Hello packets to maintain neighbor relationships.
* If a Hello timeout or link down is detected, the fault is immediately recognized.
* # LSA Update (B)
* Upon detecting a failure, the router generates a new LSA (e.g., a Router-LSA or Network-LSA) and floods it to all other routers in the same area.
* This LSA communicates the change in network topology.
* # Route Calculation (C)
* Each router that receives the updated LSAs runs the SPF algorithm to recompute the best path to every destination.
* # Entry Delivery to the FIB (D)
* After recalculating the routes, the router installs the new forwarding entries into the FIB (Forwarding Information Base) , allowing data to be forwarded along the new optimal path.
# Official Huawei Reference:
" OSPF convergence after a network failure consists of fault detection, LSA flooding, SPF calculation, and updating the FIB. Each step must be completed for traffic to resume correctly on alternate paths. "
- [Huawei HCIA-Datacom Certification Guide - Chapter: OSPF Convergence and SPF Algorithm]
NEW QUESTION # 86
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 ?
Answer: A,B
Explanation:
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 .
Reference:
HCIP-Datacom-Advanced Routing & Switching Technology V1.0 - BGP Route Selection and Local Preference Huawei Official HCIP-Datacom Study Guide - BGP iBGP Peering and Best Path Selection Rules Huawei Documentation on BGP Local-Preference and Route Selection Behavior
NEW QUESTION # 87
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