D: We should increase half-life, not decrease it to 5. References: - routing-policies-to-damp-bgp-route-flapping.html QUESTION 54 You are asked to deploy VPLS in your network as a new service for several customers, and you must identify the configuration and provisioning requirements for your customers. In this scenario, which two statements are correct? (Choose two.) A. CE interfaces facing the service provider must be Ethernet interfaces. B. VLAN IDs defined on CE interfaces must be the same on both ends unless otherwise negotiated. C. PE interfaces facing the core must have VPLS encapsulation enabled. D. CE interfaces facing the service provider must be Layer 3 interfaces. Correct Answer: AB Section: (none) Explanation Explanation/Reference: A: VPLS is an Ethernet-based multipoint-to-multipoint Layer 2 VPN. B: The Ethernet interface on the first CE must use the same VLAN ID as the second CE. Incorrect Answers: D: VPLS is an Ethernet-based multipoint-to-multipoint Layer 2 VPN. References: - collections/feature-guide-virtual-private-lan-service/feature-guide-virtual-private-lan-service.pdf QUESTION 55 Click the Exhibit button. ISP1 has created an L3VPN to connect CE1 and CE2. The PE-CE routing protocol is OSPF. Referring to the exhibit, which technology will allow CE1 to receive Type 1 and Type 2 LSAs from CE2? A. OSPF sham links B. RIB groups C. OSPF domain IDs D. OSPF virtual links
Correct Answer: D Section: (none) Explanation Explanation/Reference: OSPF requires that all areas in an autonomous system (AS) must be physically connected to the backbone area (area 0). In large networks with many areas, in which direct connectivity between all areas and the backbone area is physically difficult or impossible, you can configure virtual links to connect noncontiguous areas. Virtual links use a transit area that contains two or more area border routers (ABRs) to pass network traffic from one adjacent area to another. Incorrect Answers: A: You can create an intra-area link or sham link between two provider edge (PE) routing devices so that the VPN backbone is preferred over the back-door link. A back-door link is a backup link that connects customer edge (CE) devices in case the VPN backbone is unavailable. When such a backup link is available and the CE devices are in the same OSPF area, the default behavior is to prefer this backup link over the VPN backbone. This is because the backup link is considered an intra-area link, while the VPN backbone is always considered an interarea link. Intra-area links are always preferred over interarea links. B: A RIB group is a way to have a routing protocol, in most cases, place information in multiple route tables.
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- Fall '16
- Pham Bao Son
- Computer Science, Correct Answer, Router, routing protocol, Open Shortest Path First, exhibit button