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| Section | Weight | Objectives |
|---|---|---|
| Network O&M | 7% | - Operation & maintenance best practices - Monitoring and health metrics |
| Advanced BGP Features | 10% | - Route reflector and attributes - BGP policy controls |
| Advanced Ethernet Technologies | 10% | - MAC/security features - VLAN and Ethernet enhancements |
| Advanced IGP Features | 17% | - IS-IS advanced optimisations - OSPF advanced capabilities |
| Troubleshooting | 10% | - Network diagnostics - Issue resolution strategies |
| Network Cutover | 7% | - Migration planning techniques - Rollback procedures |
| IPv6 Routing | 20% | - OSPFv3/IS-IS for IPv6 - IPv6 static and dynamic routing |
| MPLS Technologies | 19% | - MPLS LDP and TE - MPLS VPN basics |
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230. Frage
On the network shown in the figure, OSPF runs on R1, R2, and R3, and OSPF BFD is enabled. R1 and R3 use loopback interfaces to establish an iBGP peer relationship. If GE0/0/1 of R2 is shut down, which of the following is the longest period after which the BGP peer relationship of R1 will change from Up to Down?
Antwort: C
Begründung:
# Key Facts from the Scenario:
* OSPF runs between R1-R2-R3.
* iBGP peer relationship is established between loopback interfaces of R1 and R3 .
* BGP does not detect link failures directly because it runs over loopbacks and relies on the underlying routing protocol (OSPF here).
* BFD (Bidirectional Forwarding Detection) is enabled with OSPF to provide fast failure detection .
# What Happens If GE0/0/1 on R2 Fails?
* The OSPF adjacency between R2 and R3 fails.
* Normally, OSPF would take up to 40 seconds (default dead interval) to detect this.
* However, with BFD enabled , the failure can be detected in as little as 1 second (depending on timers).
* Huawei typically configures BFD with a default detection time of around 3 seconds unless specifically tuned lower.
# Impact on BGP:
* Since the route to R3's loopback disappears quickly due to BFD detection, R1 loses the next-hop reachability to R3.
* As a result, the iBGP session between R1 and R3 will go Down within approximately 3 seconds .
# Therefore, the maximum period before BGP peering drops is 3 seconds.
# Final answer: C. 3s
Official Huawei Extract:
" BFD provides fast link failure detection for protocols such as OSPF. When BFD is enabled, the failure detection time can be reduced to milliseconds or a few seconds, allowing upper-layer protocols like BGP to react quickly to routing failures. "
- [Huawei HCIA-Datacom Certification Guide - OSPF Fast Convergence and BFD Integration Chapter]
231. Frage
In the hub-spoke networking shown in the figure, the Hub-PE can be configured to allow repetitive local AS numbers for correct route transmission.
Antwort: B
232. Frage
Which of the following commands can be configured on an IS-IS Level-1-2 device to prevent the Level-1 device from generating a default route?
Antwort: C
233. Frage
According to this picture, you can judge
Antwort: C,D
234. Frage
By default, a P2P or broadcast interface sends OSPF Hello packets at an interval of 10s, and the neighbor dead interval is 40s.
Antwort: B
Begründung:
In OSPF, Hello packets are exchanged periodically between neighboring routers to establish and maintain adjacency relationships. On point-to-point (P2P) and broadcast networks, the default Hello interval is 10 seconds, while the default Router Dead interval is 40 seconds.
The Hello interval determines how frequently a router sends Hello packets to its neighbors. The Router Dead interval specifies how long a router waits without receiving Hello packets before declaring its neighbor unavailable.
For a normal OSPF adjacency, neighboring interfaces must have compatible Hello and Dead timer settings.
Mismatched timer values can prevent adjacency establishment.
Huawei ' s training material identifies 40 seconds as the default OSPF Dead timer. Technologies such as Bidirectional Forwarding Detection (BFD) can provide faster fault detection without requiring excessively short OSPF Hello intervals.
Therefore, the statement is TRUE.
HCIP-Datacom-Advanced Routing & Switching Technology V1.0 Training Material.pdf
235. Frage
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