The Basics of BGP
Terms
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- BGP is a distance vector or link state protocol?
- path vector?
- BGP creates and maintains connections between peers, using ___ port ___
- TCP 179
- The connection is maintained by ....
- periodic keepalives.
-
Any change in the network
results in a _____ - triggered update.
- It is possible to manipulate the trafï¬c flow by using _________
- attributes
- Four different message types are used in BGP:
-
■Open messages —Used to establish connections with peers.
■Keepalives —Sent periodically between peers to maintain connections and verify paths
■Update messages —Contain paths to destination networks and the path attributes
■Notification—Used to inform the receiving router of errors that cause the connection to be closed. -
BGP will propagate
1) the prefix and the prefix mask together
2) only prefix
3) only prefix mask - 1) the prefix and the prefix mask together
- What is the hop-by-hop paradigm?
- This paradigm is the capability to influence which router will be the next-hop router, potentially dictating it at every router and thus influencing the entire path of the traffic, hop by hop.
- Traffic can be directed on either the ____________ or both the
-
source address
source and destination addresses -
Policy-based routing does not affect the destination of the packet. It affects the path used to get to the destination.
True / False - True!
-
Policy-based routing does not allow traffic sent into another autonomous system to take a different path from the one that would have been chosen by that autonomous system.
True / False - True
- It is possible to influence how traffic will be routed within that autonomous system.
-
False
It is possible to influence only how traffic will get to a neighboring autonomous system, not how it will be routed within that autonomous system. - The Four Categories of Attributes are:
-
Well-known (mandatory / discretionary)
Optional (Transitive / Non-transitive)