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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Advanced BGP Features | 10% | - BGP route attributes and policies - BGP path control and filtering - Route reflectors and confederations |
| Topic 2: Advanced IGP Features | 17% | - IGP route selection and control - OSPF advanced features and optimization - IS-IS advanced features and convergence |
| Topic 3: MPLS Technologies | 19% | - MPLS protection and fast reroute - MPLS basics and label distribution - MPLS VPN and traffic engineering |
| Topic 4: Network Troubleshooting | 10% | - Troubleshooting routing and switching issues - Fault diagnosis and analysis methods |
| Topic 5: Network O&M | 7% | - Network monitoring and management tools - Performance optimization and capacity planning |
| Topic 6: Network Cutover and Migration | 7% | - Service switchover and verification - Migration strategies and risk control |
| Topic 7: Advanced Ethernet Technologies | 10% | - Advanced link aggregation and reliability - VLAN stacking and QinQ - Ethernet OAM and protection mechanisms |
| Topic 8: IPv6 Routing | 20% | - OSPFv3 and IS-IS for IPv6 - IPv6 addressing and transition technologies - BGP4+ and IPv6 route deployment |
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NEW QUESTION # 140
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,C
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 # 141
A network engineer discovered that a link failure alarm frequently appeared on the interface of a certain device. The interface is an Ethernet optical port. Which of the following commands can the network engineer use to check the transmit and receive optical power of the interface?
Answer: C
NEW QUESTION # 142
BGP/MPLS IP VPN can only use LDP to construct public network free channels.
Answer: A
NEW QUESTION # 143
In a VRRP deployment, Router A has priority 120 and Router B has priority 110. Router A fails and Router B becomes Master. After Router A recovers, Router B continues forwarding traffic.
Which feature explains this behavior?
Answer: A
NEW QUESTION # 144
In the network shown in the figure, R1, R2, R4, and R5 run IS-IS in area 49.0001, R3 and R6 run IS-IS in area 49.0002, and "import-route isis level-2 into level-1" is configured on R2 and R5.
Within AS 65000, R1, R3, R4, and R6 all establish IBGP neighbor relationships with R2 and R5, of which R2 and R5 are RRs, and R1, R4, R3, and R6 are clients. R2 and R5 also establish an IBGP neighbor relationship and configure the same Cluster ID. IBGP neighbor relationships are all established using the Loopback0 interface. The IP address of the Loopback0 interface of each device is 10.0.X.X/32, and the Router ID is 10.0.X.X, where X is the device number. R1 and R4 import the external network 192.168.1.0/24 into BGP, and R3 and R6 import the external network
192.168.2.0/24 into BGP. In the BGP process of all routers, configure "maximum load-balancing ibgp 8".
Which of the following descriptions are correct by default? (Multiple choice)
Answer: B,C,D
NEW QUESTION # 145
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