Three Well-Known Mandatory BGP Attributes
Question
What are three well-known mandatory BGP attributes? (Choose three.)
Answers
Explanations
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ORIGIN is a well known mandatory attribute that indicates the origin of the prefix, or rather, the way in which the prefix was injected into BGP.
The AS_PATH is a well-known mandatory attribute.
The BGP NEXT_HOP is a well-known mandatory attribute.
http://www.informit.com/articles/article.aspx?p=331613&seqNum=5The Border Gateway Protocol (BGP) is the protocol used to exchange routing information among different autonomous systems (AS) on the internet. BGP is responsible for determining the best path for routing data across the internet. To achieve this, BGP uses a set of attributes that describe the properties of each route. Here are the explanations of the three well-known mandatory BGP attributes:
AS Path: The AS Path attribute is a mandatory BGP attribute that contains a list of AS numbers that the route has traversed to reach the current AS. The AS Path is used to prevent routing loops and to provide routing policy control. BGP routers use the AS Path attribute to determine the shortest path to the destination network. This attribute is essential for ensuring that routing loops are avoided and that traffic is forwarded efficiently.
Next Hop: The Next Hop attribute is another mandatory BGP attribute that specifies the IP address of the next hop router to reach the destination network. The Next Hop attribute is used to ensure that traffic is forwarded correctly across the internet. This attribute is important because BGP routers use it to forward traffic to the correct destination.
Origin: The Origin attribute is a mandatory BGP attribute that indicates the origin of the route. There are three possible values for the Origin attribute: IGP, EGP, and incomplete. IGP indicates that the route was learned via an Interior Gateway Protocol (IGP) such as OSPF or IS-IS. EGP indicates that the route was learned via an Exterior Gateway Protocol (EGP) such as BGP. Incomplete indicates that the origin of the route is unknown. The Origin attribute is used to provide information about the source of the route and is important for routing policy control.
