What are the mandatory, well-known BGP attributes?
A.
origin, AS-path, next-hop
B.
AS-path, origin, MED
C.
AS-path, origin, weight
D.
AS-path, weight, MED
Explanation:
BGP Path Attributes
Mandatory Well-Known Attributes
Origin: Specifies the router’s origin
IGP
EGP
Unknown — Route was redistributed
AS-Path: Sequence of AS numbers through which the route is accessible
Next-Hop: IP address of the next-hop router
Discretionary Well-Known Attributes
Local Preference: Used for consistent routing policy with an AS
Atomic Aggregate: Informs the neighbor AS that the originating router aggregated routes
Nontransitive Attributes
Multiexit Discriminator: Used to discriminate between multiple entry points into an AS
Transitive Attributes
Aggregator: IP address and AS of the router that performed aggregationCommunity: Used for route tagging
CCIE Routing and Switching v4.0 Quick Reference