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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Network Cutover | 7% | - Migration process - Basic cutover concepts |
| Topic 2: IPv6 Routing | 20% | - IPv6 static routes - BGP4+ - IS-IS for IPv6 - OSPFv3 |
| Topic 3: Advanced IGP Features | 17% | - Route control - Fast convergence - IS-IS advanced features - OSPF advanced features |
| Topic 4: MPLS Technologies | 19% | - MPLS principles - MPLS VPN applications - MPLS configuration - MPLS forwarding |
| Topic 5: Network O&M | 7% | - Data collection - Routine maintenance |
| Topic 6: Advanced Ethernet Technologies | 10% | - VLANs - Ethernet security |
| Topic 7: Network Troubleshooting | 10% | - Troubleshooting methods - Structured troubleshooting processes |
| Topic 8: Advanced BGP Features | 10% | - Inter-domain routing optimization - BGP route control - Advanced BGP features - Route reflectors |
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NEW QUESTION # 51
On the OSPFv3 network shown in the figure, area 1 is a stub are
a. Which of the following statements are true?
Answer: A,B
NEW QUESTION # 52
On a broadcast network, routers (including non-DIS routers) of the same level on a network segment can establish neighbor relationships. In the implementation of BFD for IS-IS, however, BFD sessions are established only between a DIS and non-DIS routers, not between non-DIS routers.
Answer: A
NEW QUESTION # 53
In OSPF, ABR will convert all Type 7 LSAs in the NSSA area into Type 5 LSAs.
Answer: B
NEW QUESTION # 54
On an enterprise network shown in the figure, EBGP is deployed between CEs and PEs.
CE1 sends a VPN route to PE1.
Which of the following statements are false?
Options:
Answer: B,D
Explanation:
Comprehensive and Detailed In-Depth Explanation:
1. Understanding Site of Origin (SoO) in MPLS VPNs
* SoO (Site of Origin) is used in MPLS VPNs to prevent loops in multi-homed CE scenarios.
* Routes with the same SoO value are not advertised back to the same site.
2. Analysis of Each Answer Choice
A: "To enable CE3 to receive the route, run the command peer 10.1.1.1 soo 200:1 on PE1." (# False)
* SoO is used to prevent loops by tagging routes that belong to the same site.
* Applying SoO (200:1) on PE1 for CE1 means that any other PE (such as PE2) receiving the route will not advertise it back to the same site (CE1).
* This statement is false because applying SoO here does not directly enable CE3 to receive the route. Instead, CE3 must accept routes with SoO values properly configured.
B: "If the commands peer 10.1.1.1 soo 200:1 and peer 10.1.2.1 soo 200:1 are run on PE1, CE2 accepts the route." (# False)
* SoO ensures that a route received from one CE is not sent back to another CE in the same site.
* If SoO (200:1) is assigned to CE1 and CE2, routes will be blocked because they share the same SoO tag.
* Thus, CE2 will not accept the route, making this statement false.
C: "If the command peer 10.1.3.1 substitute-as is run on PE2, CE3 accepts the route." (# True)
* substitute-as allows a router to replace the received AS number in the AS_PATH with another AS number, ensuring that routes are accepted even when AS_PATH filtering is in place.
* This prevents CE3 from rejecting the route due to AS-Path loop prevention.
* # Thus, this statement is true.
D: "If no additional action is taken, CE3 discards the route." (# True)
* By default, CE3 will discard the route because of BGP loop prevention (same AS in the AS_PATH).
* To allow CE3 to receive the route, the allowas-in or substitute-as command must be configured on PE2.
* # Thus, this statement is true.
3. Evaluating the Answer Choices
Option
Correct?
Reasoning
A
# False
Applying SoO does not directly enable CE3 to receive the route.
B
# False
If both CE1 and CE2 have the same SoO value, CE2 will reject the route.
C
# True
Substitute-AS allows CE3 to accept the route by modifying the AS-Path.
D
# True
Without additional configuration, CE3 will discard the route due to AS-Path loop prevention.
# Correct answer: A and B are false.
Final Conclusion:
* SoO prevents routing loops in MPLS VPN multi-homing.
* CE2 will reject the route if it has the same SoO as CE1.
* CE3 requires the substitute-as or allowas-in command to accept the route.
* Thus, statements A and B are false.
NEW QUESTION # 55
How to view log information? (Multiple choice)
Answer: A,C,D
NEW QUESTION # 56
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