router
The Routing and Remote Access Services for Windows 2008 is always accepted with a VPN or RRAS. That is all Windows 2008 can handle, along with R2 and an LAN network.
RA may stands for: Registration Authority, Risk Assessment, Remote Access, Routing Arbiter, Remote Adapter, Remote Assistance, Restricted Areas
Using routing and remote access server role
Two common routing protocols used by routers to learn remote networks and build their routing tables are Routing Information Protocol (RIP) and Open Shortest Path First (OSPF). RIP is a distance-vector protocol that uses hop count as its metric, while OSPF is a link-state protocol that uses a more complex algorithm based on the state of the links to determine the shortest path. Both protocols enable routers to exchange routing information and dynamically update their routing tables as network topologies change.
Metrics used by routing protocols are used to determine the best path for routing data packets. Different routing protocols use various metrics such as hop count, bandwidth, delay, load, and cost to make routing decisions. The choice of metric can impact the efficiency and effectiveness of the routing protocol in selecting optimal paths.
RRAS (Routing and Remote Access service)
the best route to reach remote networks the interfaces used to forward packets
There is no path to the remote network in the routing table of router R1.
When you have multiple routing protocols running (e.g. RIP, OSPF, EIGRP), the one with the lowest administrative distance is used for the routing table. The metric is different; it's used within the routing protocol to determine which route is best to a certain network. EIGRP has a AD of 90. RIP has an AD of 120. Since EIGRP has a lower AD, it will be used for the routing table.
the path learned via EIGRP
Routing was design to avoid broadcasting. It basically means that when you establish connection with remote computer you send messages only to the computer and nobody else. Broadcasting is opposite to routing, and it was design to explore networks around you. When you send a broadcast signal you send to everybody in the specified network.