How does the RIB differ from the FIB?
How does the RIB differ from the FIB?
The RIB (Routing Information Base) contains a collection of routing information, including multiple routes to the same destination prefix. It serves as a comprehensive database of network routes, which come from different sources like routing protocols and static routes. On the other hand, the FIB (Forwarding Information Base) holds only the best route for each destination prefix, as determined by the routing protocol's decision process. This streamlined set of routes is utilized for efficient packet forwarding, ensuring that each packet reaches its destination via the most optimal path.
I think correct answer is D
I agree with D
I agree. According to Wikipedia...(Weird) https://en.wikipedia.org/wiki/Routing_table In computer networking a routing table, or routing information base (RIB), is a data table stored in a router or a network host that "lists the routes to particular network destinations"
i agree
The best paths from EIGRP’s RIB and the best paths from BGP’s RIB are passed into the routing table RIB. Where competing paths exist from multiple routing protocols then Administrative Distance (AD) as a tiebreaker – lower is better.The winning paths are then passed to the FIB to be used for forwarding packets on to the next-hop router. The same process has also happened on the next router and the next one, until the packet reaches its destination.
https://writemem.co.uk/what-is-a-rib-and-a-fib/
C is correct FIB has info about next hop and interface identifier so it has the routes for particular network destination
but you CREATE a routing table with RIB? Does RIB just receive the route but does not create it?
Guys C is the best answer ..Routing Information Base (RIB) is a distributed collection of information about routing connectivity among all nodes of a network. Each router maintains a RIB containing the routing information for that router. RIB stores the best routes from all routing protocols that are running on the system. https://www.cisco.com/c/en/us/td/docs/iosxr/ncs5500/routing/61x/b-ncs5500-routing-configuration-guide-61x/b-ncs5500-routing-configuration-guide-61x_chapter_0100.html#:~:text=Routing%20Information%20Base%20(RIB)%20is,are%20running%20on%20the%20system.
The correct answer is: D. The RIB includes many routes to the same destination prefix. The FIB contains only the best route. Explanation: RIB (Routing Information Base): It is a data structure that stores network routing information, including multiple routes to the same destination. Each route in the RIB has associated attributes such as administrative distance, metric, and more. The RIB is used by the routing protocol to maintain a comprehensive view of the network's routing information. FIB (Forwarding Information Base): It is a data structure that stores the best (selected) routes from the RIB. Unlike the RIB, the FIB only contains the best routes for each destination prefix. The FIB is used by the forwarding plane to make decisions about where to forward packets. In summary, the RIB contains a more comprehensive set of routes, including multiple routes to the same destination, while the FIB contains only the best route for each destination.
Routing protocols such as OSPF, EIGRP, and BGP each have their own Routing Information Base (RIB). The best routes to each destination network are selected to be installed in the global RIB, or the IP routing table from each routing protocol RIB. If more than one routing protocol is being executed on a router, the best routes from each RIB will be chosen by a parameter called administrative distance. Administrative distance is the feature that routers use to select the best path when there are two or more different routes to the same destination from two different routing protocols. Administrative distance defines the reliability of a routing protocol. Each routing protocol is prioritized in order of most to least reliable (believable) with the help of an administrative distance value. The FIB is derived from the IP routing table and is arranged for maximum lookup throughput.
..best route..
it´s D RIB: is a data structure that contains all routes learned by a router, including multiple routes to the same destination prefix. These routes can come from various sources such as routing protocols, static routes, and directly connected networks. FIB: is a subset of the RIB and contains only the best route for each destination prefix as determined by the routing protocol's decision process. C is incorrect because RIB doesn't create network topologies, and FIB is not just a list of routes to particular network destinations, it contains the best routes selected from the RIB for each destination prefix.
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Option D - RIB contains many routes to a destination. FIB has the association of best route (path) to the destination and the forwarding interface.
i'd say C. D is obviously incorrect as FIB may have 1+ entries with ECMP
It is D only if it sais "the best routes" in plural cuase FIB alias CEF can contain multiple routes to the destination otherwise ECMP wont work C is correct: RIB: sh ip route ... (control plane) FIB: sh ip cef ... (data plane)
"C" obviously
Funny Sisko, option D seems the best
How do you know the correct answer when you cant even spell Cisco.
the correct answer is D
I agree with D. RIB is, in essence, a comprehensive database, housing a myriad of routing entries. Each routing entry includes vital data such as the network destination, associated subnet mask, next-hop IP address, and various attributes relevant to routing decisions. Conversely, the Forwarding Information Base, or FIB, has a more focused role within the router. Derived directly from the RIB, the FIB contains a subset of information critical to packet forwarding. FIB distills this comprehensive information into an efficient and streamlined set of next-hop entries. It represents the best path to reach each destination, ensuring optimal packet forwarding. https://www.youtube.com/watch?v=GaKmC7QK7E8
Answer options mentions RIB not RIBs. Answer is C. Each routing protocol has its own RIB and each RIB contains only one route to destination. Routing protocols such as OSPF, EIGRP, and BGP each have their own Routing Information Base (RIB). The best routes to each destination network are selected to be installed in the global RIB, or the IP routing table from each routing protocol RIB. If more than one routing protocol is being executed on a router, the best routes from each RIB will be chosen by a parameter called administrative distance. Administrative distance is the feature that routers use to select the best path when there are two or more different routes to the same destination from two different routing protocols. Administrative distance defines the reliability of a routing protocol. Each routing protocol is prioritized in order of most to least reliable (believable) with the help of an administrative distance value. The FIB is derived from the IP routing table and is arranged for maximum lookup throughput.
Each change in the IP routing table triggers a similar change in the FIB table because it contains all next-hop addresses that are associated with all destination networks.
Each change in the IP routing table triggers a similar change in the FIB table because it contains all next-hop addresses that are associated with all destination networks. << this sentence come from cisco official self training so I think answer should be C.