Best Path Algorithm, also known as Path-Vector Routing
Internetworking with Cisco and Microsoft Technologies pg. 297
If you are in net+ 3rd edition like me, I do not belive this protocol is mention which leads me to believe the answer we are looking for in the study guide is Distance Vector, since BGP is a distance vector protocol. It can only be one of two in this case afaik, distance vector or Link State. :)
No, You cannot run two BGP process on a Single Router. Yes, it is possible if you use different VRFs
bgp is the largest protocol
It depends on the routing protocol in use, for example RIP uses the hop-count to determine the best route where less hops is better, OSPF uses cost, EIGRP uses a composite metric (BW + Delay + Reliability + Load) etc.
The best search algorithm to use for a sorted array is the binary search algorithm.
Classful routing protocols do not carry subnet mask information on their routing updates. This makes them unsuitable for hierarchical addressing that require Variable Length Subnet Mask (VLSM) and discontiguous network. Classless routing protocols do carry subnet mask information on their routing updates.RIP v1 and IGRP are classful routing protocols. RIP v2, EIGRP, OSPF, and BGP are classless routing protocol.When running a classful routing protocol on a network, make sure you use the same subnet mask everywhere. Otherwise, routing black holes can occur.Classless routing protocols extend the standard Class A, B, or C IP addressing scheme by using a subnet mask or mask length to indicate how routers must interpret an IP network ID. Classless routing protocols include the subnet mask along with the IP address when advertising routing information. Subnet masks representing the network ID are not restricted to those defined by the address classes, but can contain a variable number of high-order bits. Such subnet mask flexibility enables you to group several networks as a single entry in a routing table, significantly reducing routing overhead. Classless routing protocols includes RIP v2 and OSPF, Border Gateway Protocol version 4 (BGP4) and Intermediate System to Intermediate System (IS-IS).
BGP
A routing protocol is a protocol that routers use to tell each other about available routes. Some of the routing protocols include RIP, EIGRP, OSPF, IS-IS, BGP.
No router eigrp <AS #> No router ospf <process ID> No router bgp <AS #> No router rip
DUAL
The Border Gateway Protocol (BGP) is the core routing protocol of the Internet. It maintains a table of IP networks or 'prefixes' which designate network reachability among autonomous systems (AS). It is described as a path vector protocol. BGP does not use traditional IGP metrics, but makes routing decisions based on path, network policies and/or rulesets. BGP was created to replace the EGP routing protocol to allow fully decentralized routing in order to allow the removal of the NSFNet Internet backbone network. This allowed the Internet to become a truly decentralized system. Since 1994, version four of the protocol has been in use on the Internet. All previous versions are now obsolete. The major enhancement in version 4 was support of Classless Inter-Domain Routing and use of route aggregation to decrease the size of routing tables. Since January 2006, version 4 is codified in RFC 4271, which went through well over 20 drafts based on the earlierRFC 1771 version 4. The RFC 4271 version corrected a number of errors, clarified ambiguities, and also brought the RFC much closer to industry practices. Most Internet users do not use BGP directly. However, since most Internet service providers must use BGP to establish routing between one another (especially if they aremultihomed), it is one of the most important protocols of the Internet. Compare this withSignalling System 7 (SS7), which is the inter-provider core call setup protocol on thePSTN. Very large private IP networks use BGP internally, however. An example would be the joining of a number of large Open Shortest Path First (OSPF) networks where OSPF by itself would not scale to size. Another reason to use BGP is multihoming a network for better redundancy either to multiple access points of a single ISP (RFC 1998) or to multiple ISPs.
Distance Vector protocols use the Bellmanâ??Ford algorithm. The ARPANET system relied on Distance Vector protocols as their main routing technique in the early 80s.
The command used to display the commands that configure the routing protocol on a router is show running-config. This command provides a comprehensive view of the current configuration, including any routing protocols like OSPF, EIGRP, or BGP. To focus specifically on routing protocols, you can also use show ip protocols, which summarizes the active routing protocols and their settings.
sunny NO, BGP works between ASs, while IGP works inside AS
Dynamic routing protocols are "languages" routers use to communicate the details and status of networks to which they are connected. Examples include RIP, OSPF, EIGRP, BGP and IS-IS.They are called dynamic because they can respond to network changes, such as a failed link, a new link or in some cases a change to a link (perhaps a changed bandwidth value). This is in contrast to a static route, which an administrator must type in manually and which cannot automatically respond to network changes.Two routers must be running the same routing protocol to exchange route information; RIP cannot talk directly to OSPF, for example. The router admin must enable the routing protocol, then instruct the router which of its connected networks it should advertise to other routers running the same protocol.
BGP border gateway protocol is the most commoly use exterior gateway protocol. EGP are used by ISP's and are being routed from a private network to the internet and to its destination private network.
A practical application is in certain routing protocols, like OSPF. The problem it solves is to search for the "shortest" path to each destination - "shortest" meaning the one that has the lowest "distance" or "metric" according to the criteria used. Dijkstra's algorithm is easy to use and is a good graph search algorithm to use when it is hard to calculate the heuristics.
OSPF stands for open shortest path first. OSPF is an exterior routing protocol. OSPF uses Path vector routing algorithm.