Chapter 11 - BGP

Question 1

True or false: The IPv4 address family must be initialized to establish a BGP session with a peer using IPv4 addressing.

Answer 1

False
Obs: The IPv4 address family is automatically initialized by default on IOS-based devices.

Question 2

Which command is used to view the BGP neighbors and their hello intervals?
A - show bgp neighbors
B - show bgp afi safi neighbors
C - show bgp afi safi summary
D - show afi bgp interface brief

Answer 2

B
Obs: The command show bgp afi safi neighbors displays all the neighbors, their capabilities, session timers, and other useful troubleshooting information.

Question 3

Which of the following autonomous systems are private? (Choose two.)
A - 64,512–65,535
B - 65,000–65,535
C - 4,200,000,000–4,294,967,294
D - 4,265,000–4,265,535,016

Answer 3

A and B
Obs: A quando tinha 2 bytes para o ASN
e C depois que adicionaram mais 2 bytes totalizando 4. O numero de ANS disponível aumentou exponencialmente.

Question 4

How many tables does BGP use for storing prefixes?
A - One
B - Two
C - Three
D - Four

Answer 4

C
Obs: Adj-RIB-In, Loc-RIB (BGP Database) and Adj-RIB-Out

Question 5

True or false: The IPv6 address family must be initialized to establish a BGP session with a peer using IPv6 addressing.

Answer 5

True

Question 6

True or false: A BGP session is always one hop away from a neighbor.

Answer 6

False
Obs: Fecha peering através de uma sessão TCP, porta 179, podendo fazer com um router 2 hops a frente.

Question 7

True or false: BGP supports dynamic neighbor discovery by both routers.

Answer 7

False
Obs: Sempre manualmente através do comando neighbor

Question 8

Which BGP attribute must be recognized by all BGP implementations and advertised to other autonomous systems?
A - Well-known mandatory
B - Well-known discretionary
C - Optional transitive
D - Optional non-transitive

Answer 8

A

Question 9

True or false: BGP advertises all its paths for every prefix so that every neighbor can build its own topology table.

Answer 9

False
Obs: Cada router não tem uma topologia completa da tabela de roteamento dos vizinhos. Quem faz isso é o OSPF.

Question 10

Which BGP command advertises a summary route to prevent link-flap processing by downstream BGP routers?
A - aggregate-address network subnet-mask as-set
B - aggregate-address network subnet-mask summary-only
C - summary-address network subnet-mask
D - summary-address network mask subnet-mask

Answer 10

B