Flashcards in BGP Routing Protocol Q/A's Deck (50)
BGP is a path-vector "direction" that selects and uses the best valid path. True/False
What does BGP stand for?
BGP routers route and distribute packets between what?
Border Gateway Protocol
neighbors-peers of autonomous systems (AS)
Does BGP broadcast it's entire routing table? True/False
What is the name of the database where BGP routing updates are stored?
Routing Information Base Loc-RIB
What are the six states of BGP in order?
What is a route reflector (RR)?
What would cause a route reflector (RR) to activate?
What does MP-BGP stand for?
What does MP-BGP route over BGP?
Multi Protocol Border Gateway Protocol
multiple network protocols and address families
What two things does the address family identifier associate together in BGP?
network protocols with network addresses
BGP neighbors are connected with other what?
BGP neighbors are configured dynamically or statically?
When BGP routes data in between other Autonomous systems, what type of routing is this called?
What vector type routing protocol is BGP?
What topology information does BGP routes contain, full, partial or no topology information?
Does BGP maintain path information between other peers statically or dynamically?
complete topology information
What does BGP use in order to peer with other neighbor routers?
(AS) autonomous system number
What two types of databases does BGP used to display routing information?
Neighbor database (ND) "show ip bgp neighbors"
Routing Table - Routing Information Base (RIB) "Show IP Route BGP"
The BGP open message state establishes what?
The BGP update message state performs what three types of routing updates?
Advertisements, updates and withdrawing routes
What do BGP Notifications indicate?
BGP synchronization rules are what?
BGP will not advertise routes when a Internal BGP neighbor to a External BGP neighbor can't validate what?
Set of rules and protocols followed on when and not to advertise routes
BGP session are established when adjacencies form between two or more?
BGP establishes what type of adjacency between each other?
Peer to Peer (Point to Point)
Who assigns all the unique public ASN's Autonomous Systems Numbers in the world?
Internet Assigned Numbers Authority (IANA)
What three things does IANA require when requesting a public ASN?
1. Public Block Address Network Range
2. Multiple connections to the internet
3. Unique routing policy from providers
What is an AS Path?
Route between BGP peers
What is added to a BGP router update that's sent to it's neighbor peer in a different AS autonomous system?
The AS Path of itself
What is the purpose of using an AS Path Prepend?
manipulate routing path of data
What AS path does BGP prefer the longest or shortest path?
shortest AS path
Does BGP use hello packets to discover neighbors? Yes/No
What does BGP use instead of hello packets to communicate with every peer and why?
TCP: port 179 for convenience
Does BGP use a dynamic neighbor discovery protocol. Yes/No
BGP traffic is always point to point? True/False
True (Peer to Peer)
What three configurations are required for BGP peering?
BGP Session Establishment
The routing information base consist of what three parts for maintaining network prefixs and path attributes for BGP routes?
Adj-RIB-in: Adjacent Route Information Base (in)
Loc-RIB: Location Route Information Base
Adj-RIB-out: Adjacent Route Information Base (out)