ccna certification roadmap

ccna certification roadmap.Chapter 6 Dynamic Routing and RIP .75 . The protocol was originally defined in RFC1058. Each RIP-capable router broadcasts ( RIPvl) or multicast ( RIPv2) routing update information to its directly connected network neighbors every 30 seconds by default using UDP port 520.The RIP protocol is divided into version 1 and version 2, both of which have the following common features.It was the first distance vector routing protocol to emerge.It uses Hop Count as a metric, and the maximum number of hops for the metric is 15.By default, the routing update period is 30 seconds.The Administrative Distance (AD) is 120oTriggered updates are supported, and equivalent paths are supported.Both the RIP packet source and destination ports operate using the UDP520 port, and without authentication, aA RIP update packet can contain a maximum of 25 routing entries, and the packet can be a maximum of 512 bytes ( UDP packet header 8 bytes + RIP packet header 4 bytes + routing entry 25X20 bytes).Since the router running RIP does not know the global picture of the network, the router must rely on neighboring routers to obtain reachable information about the network. Since periodic routing update information propagates slowly across the network, this leads to slower network convergence and can cause RoutingLoop.RIP avoids routing loops by using the following five mechanisms.