BGP Routing Protocol Q/A's Flashcards Preview

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Flashcards in BGP Routing Protocol Q/A's Deck (50)
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1

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?

True

Border Gateway Protocol

neighbors-peers of autonomous systems (AS)

2

Does BGP broadcast it's entire routing table? True/False

False

3

What is the name of the database where BGP routing updates are stored?

Routing Information Base Loc-RIB

4

What are the six states of BGP in order?

Idle
connect
active
opensent
openconfirm
established

5

What is a route reflector (RR)?

What would cause a route reflector (RR) to activate?

second route

route failure

6

What does MP-BGP stand for?

What does MP-BGP route over BGP?

Multi Protocol Border Gateway Protocol

multiple network protocols and address families

7

What two things does the address family identifier associate together in BGP?

network protocols with network addresses

8

BGP neighbors are connected with other what?

BGP neighbors are configured dynamically or statically?

peers

statically

9

When BGP routes data in between other Autonomous systems, what type of routing is this called?

Interdomain routing

10

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?

path-vector protocol

complete topology information

dynamically

11

What does BGP use in order to peer with other neighbor routers?

(AS) autonomous system number

12

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"

13

The BGP open message state establishes what?

BGP adjacency

14

The BGP update message state performs what three types of routing updates?

Advertisements, updates and withdrawing routes

15

What do BGP Notifications indicate?

an error

16

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

Network Prefix

17

BGP session are established when adjacencies form between two or more?

BGP establishes what type of adjacency between each other?

Peers

Peer to Peer (Point to Point)

18

Who assigns all the unique public ASN's Autonomous Systems Numbers in the world?

Internet Assigned Numbers Authority (IANA)

19

What three things does IANA require when requesting a public ASN?

Proofs
1. Public Block Address Network Range
2. Multiple connections to the internet

Need
3. Unique routing policy from providers

20

What is an AS Path?

Route between BGP peers

21

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

22

What is the purpose of using an AS Path Prepend?

manipulate routing path of data

23

What AS path does BGP prefer the longest or shortest path?

shortest AS path

24

Does BGP use hello packets to discover neighbors? Yes/No

No

25

What does BGP use instead of hello packets to communicate with every peer and why?

TCP: port 179 for convenience

26

Does BGP use a dynamic neighbor discovery protocol. Yes/No

No

27

BGP traffic is always point to point? True/False

True (Peer to Peer)

28

What three configurations are required for BGP peering?

BGP Session Establishment
Address-Family Configuration
Address-Family Activation

29

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)

30

What does a network statement in BGP contain?

Where is the BGP routing table contained in?

specific network prefix

Loc-RIB: Location Route Information Base