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| Section | Weight | Objectives |
|---|---|---|
| MPLS Technologies | 19% | - MPLS basics and label distribution - MPLS protection and fast reroute - MPLS VPN and traffic engineering |
| Network O&M | 7% | - Performance optimization and capacity planning - Network monitoring and management tools |
| Advanced BGP Features | 10% | - BGP route attributes and policies - Route reflectors and confederations - BGP path control and filtering |
| Network Troubleshooting | 10% | - Troubleshooting routing and switching issues - Fault diagnosis and analysis methods |
| Advanced IGP Features | 17% | - OSPF advanced features and optimization - IS-IS advanced features and convergence - IGP route selection and control |
| IPv6 Routing | 20% | - OSPFv3 and IS-IS for IPv6 - BGP4+ and IPv6 route deployment - IPv6 addressing and transition technologies |
| Advanced Ethernet Technologies | 10% | - Advanced link aggregation and reliability - Ethernet OAM and protection mechanisms - VLAN stacking and QinQ |
| Network Cutover and Migration | 7% | - Service switchover and verification - Migration strategies and risk control |
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NEW QUESTION # 12
The RR rules for advertising routes violate the IBGP split horizon rules, which may cause loops in the AS. Which routing attributes does RR use to prevent loops?
Answer: D
NEW QUESTION # 13
On the network shown in the figure, EBGP peer relationships are established between neighboring routers through directly connected interfaces. The router ID of each router is 10.0.X.X, and the AS number is 6500X, where X is the number of the router.
Both R1 and R4 have static routes to 192.168.1.0/24 , which are imported to BGP using the import-route command.
R1 adds a community attribute (1:1) to the route when sending it to peers.
All routers are enabled to transmit the community attribute .
Routing policies are configured on R2 and R3 to reject routes with community 1:1 .
In this case, which of the following is the path for traffic from R3 to 192.168.1.0/24?
Answer: B
Explanation:
# Key Observations:
* R1 and R4 both import the static route 192.168.1.0/24 into BGP.
* R1 tags the route with community 1:1 , and all routers transmit community attributes .
* R2 and R3 have policies to reject routes containing 1:1 .
* R4 does NOT tag the route with 1:1 , so its advertisement is accepted.
# Behavior Breakdown:
* # R1 sends the route with community 1:1 to R2 # R2 rejects it.
* # R2 does not propagate R1 ' s route to R3 (rejected by policy).
* # R4 sends the route without 1:1 to R2.
* # R2 accepts R4 ' s route and forwards it to R3.
* # R3 receives a clean route via R2 # R4 and installs it.
# Path followed:
R3 # R2 # R4 # 192.168.1.0/24
# Final answer: B. R3 # R2 # R4
Official Huawei Extract:
" BGP community attributes can be used to mark routes and influence routing decisions through routing policies. If a router is configured to deny routes with a specific community, it will not install or forward such routes. Routes received without the blocked community tag will be accepted and used. "
- [Huawei HCIA-Datacom Certification Guide - BGP Community Attribute and Routing Policy Section]
NEW QUESTION # 14
Which of the following statements about the MP_REACH_NLRI attribute of BGP4+ is correct? (Multiple choice)
Answer: A,B,D
NEW QUESTION # 15
The figure shows the output information on a switch.
Which of the following can be determined from the information?
Answer: B
Explanation:
Comprehensive and Detailed In-Depth Explanation:
Understanding the Table and Traffic Suppression Configuration
Port Name
Type
Rate (Min/Max)
Mode
Action
Punish-Status
Trap
Log
Int
Last-Punish-Time
GE0/0/1
Broadcast
1000 / 2000
Pps
Block
Normal
Off
On
90
-
GE0/0/1
Multicast
1000 / 2000
Pps
Block
Normal
Off
On
90
-
GE0/0/1
Unicast
1000 / 2000
Pps
Block
Normal
Off
On
90
-
Key Observations from the Table:
* Traffic suppression (or rate limiting) is configured on interface GE0/0/1 for broadcast, multicast, and unicast traffic.
* Thresholds:
* Min rate: 1000 pps (packets per second)
* Max rate: 2000 pps
* If the traffic exceeds the configured threshold (2000 pps), the action is to "Block".
* The interface is still "Normal" (not shut down), meaning exceeding 2000 pps does not disable the port.
* Logging is enabled (Log: On), but trapping (Trap: Off) is disabled.
Analysis of Each Answer Choice
A: "When the average rate of unknown multicast packets is 1500 pps, GE0/0/1 blocks the multicast packets." # (False)
* The blocking threshold for multicast is 2000 pps (Max rate).
* If the rate is 1500 pps, it is still below the threshold, so traffic is not blocked yet.
# Statement A is incorrect.
B: "When the average rate of known unicast packets is 2500 pps, GE0/0/1 is shut down." # (False)
* The table does not indicate that exceeding the max threshold (2000 pps) shuts down the interface.
* Instead, it simply blocks packets exceeding the rate limit.
* The interface remains "Normal", meaning it is not shut down.
# Statement B is incorrect.
C: "After broadcast packets are blocked on GE0/0/1, broadcast packets are forwarded only when their average rate is lower than 1000 pps." # (False)
* The minimum rate is 1000 pps, but there is no indication that traffic resumes forwarding only when it drops below this rate.
* The configuration only states blocking when exceeding 2000 pps, but does not enforce a strict reactivation at 1000 pps.
# Statement C is incorrect.
D: "The administrator configures traffic suppression on GE0/0/1 of the switch." # (True - Correct Answer)
* The table explicitly shows that a traffic suppression policy is applied to broadcast, multicast, and unicast packets on GE0/0/1.
* This confirms that the administrator has configured traffic suppression (rate limiting) on this interface.
# Statement D is correct.
Final Conclusion:
# Correct answer: D. The administrator configures traffic suppression on GE0/0/1 of the switch.
NEW QUESTION # 16
On the 05PFv3 network shown in the figure, each interface of R1 and R2 has two IPv6 addresses. Although the IPv6 address prefixes of R1 and R2 are different, they can still be used to establish an OSPFv3 neighbor relationship. If R2 is the DR, the Intra-Area-Prefix-LSA generated by R2 contains four prefixes.
Answer: B
NEW QUESTION # 17
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