Exam 350-401 topic 1 question 64 discussion

i understand the question as this. R1 is a CE and therefore R3 must be a CE too. The only one that a CE connects to is a PE Router which is R2. Since we talk about VPN in sense of just simply two different routing tables without affecting or seeing eachother (VRF) should be configured. That being said, neither CE needs to do any routing table partitioning as they are simply talking to their PE router. the PE router R2 is the one needing to have separate VRF instances or so called VPNs etc. therefore DEFAULT VRF on CE always and VRF separation on PE. thanks for reading this far

It makes an assumption that the PE (being a provider) has multiple customers, and VPN_A is one customer, and is likely not using VRFs at their border to the provider, i.e. they are using the Global routing table/GRT or 'default VRF'. If it was an enterprise network with mulitple CE VRFs mapped to PE VRFs, might be different but this is a simpler example. hope that helps.

A is correct Provider Edge router (PE router) is a device located at the edge of a service provider's network that connects to customer networks (CE routers) and to other provider routers within the service provider's network. (which is R2 here) Customer Edge router (CE router) is a device located at the edge of a customer's network, typically connecting to a service provider's network. The CE router is owned and managed by the customer, and it serves as the demarcation point between the customer's network and the service provider's network. (R1 & R3 here) VRF (Virtual Routing and Forwarding) is a technology used in computer networking to create multiple instances of a routing table within a router or a layer 3 switch. Each VRF instance operates as if it had its own router, with its own routing table, interfaces, and forwarding decisions.

I dont understand why no one is saying D, gi0/0 can only be in management vrf not in default : Management VRF The management VRF is for management purposes only. Only the mgmt 0 interface can be in the management VRF. The mgmt 0 interface cannot be assigned to another VRF. No routing protocols can run in the management VRF (static only).

Default VRF: All Layer 3 interfaces exist in the default VRF until they are assigned to another VRF. Routing protocols run in the default VRF context unless another VRF context is specified. The default VRF uses the default routing context for all show commands. The default VRF is similar to the global routing table concept in Cisco IOS.

A is correct

This question is still asked. Passed today.

voting. provided answer is correct

This is kinda a dumb question.. but it is important to remember: 1: What VRF concept they are challenging you to understand. 2: That VRFs are necessarily "locally significant." In other words, the CE routers do not know, nor do they care, what VRF their upstream PE router assigns them to. The important VRF concept here is, by NOT configuring and associating an interface to a VRF, that interface is said to be utilizing the "default VRF." Technically, the CE router could have the interface associated with a "VRF BUTTERFLY", and it would not make a difference to how the PE router makes its decisions locally. But you'll want to recognize that this question is challenging your understanding of the above concept, that, while it does not matter, the client is still likely going to be assigned to default.. by default, and still work.

Default vrf could mean no vrf

These questions get more an more ridiculous. If it is a CE router, it is my router and I can configure any VRF I like. The Provider won´t even know or care what VRF I use.

The given answer is correct

Even R1 is considered to be a Customer Edge(CE) this router is only connected to R2 that is assumed to be the Provider Edge (PE). Because the R1 is only connected to 1 SP (Service Provider) there is no need to use VRFs to separate the traffic of different SPs

There is nothing special with the configuration of Gi0/0 on R1. Only Gi0/0 interface on R2 is assigned to VRF VPN_A. The default VRF here is similar to the global routing table concept in Cisco IOS

anybody know why?