Accommodating Layer 3 VPNs as Defined in RFC 4364
Question
You have been asked to provision a service provider's network to accommodate Layer 3 VPNs as defined in RFC 4364. Which three tasks must be performed before the provider network is ready to carry VPN traffic? (Choose three.)
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Explanations
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Layer 3 VPNs (Virtual Private Networks) provide a secure way for customers to connect their sites over a service provider's network, as defined in RFC 4364. To prepare a service provider network for carrying Layer 3 VPN traffic, the following three tasks must be performed:
- Configuring Router-ID on Juniper Networks PE Routers:
The Router-ID is a unique identifier that is used to distinguish each router in a network. It is a critical parameter for building routing tables, and it must be unique across the entire network. In the case of Layer 3 VPNs, all Juniper Networks PE (Provider Edge) routers must be configured with an appropriate router-ID unique to the VPN. This ensures that the PE routers can correctly identify and communicate with each other within the VPN.
- Configuring Route-Target on Juniper Networks PE Routers:
A route-target is a unique value used to distinguish the VPN routes within a service provider's network. It is used to import and export VPN routes between different PE routers. To prepare a service provider's network for Layer 3 VPN traffic, all Juniper Networks PE routers must be configured with an appropriate route-target unique to the VPN. This ensures that the PE routers can correctly import and export the VPN routes.
- Configuring Routing Instances on Juniper Networks PE Routers:
Routing Instances are logical containers that are used to segregate routing information on a Juniper Networks router. There are two types of routing instances used in Layer 3 VPNs: forwarding and VRF (Virtual Routing and Forwarding). To prepare a service provider's network for Layer 3 VPN traffic, all Juniper Networks PE routers must be configured with a routing-instance of type forwarding. This ensures that the PE routers can forward traffic between VPN sites.
In conclusion, the three tasks that must be performed before a service provider's network is ready to carry Layer 3 VPN traffic are configuring Router-ID, Route-Target, and Routing Instances on all Juniper Networks PE routers. By completing these tasks, the PE routers can correctly identify and communicate with each other, import and export VPN routes, and forward traffic between VPN sites.
