BPG 3.0

Question 1

Q

Answer 1

A

Question 2

Which feature is equivalent to soft configuration inbound?

Answer 2

route refresh

Question 3

What is the difference between route-refresh and soft reconfiguration inbound?

Answer 3

soft reconfiguration creates a database per neighbor, route refresh does not

Question 4

Feature that allows informing the neighbor which prefixes will be filtered so that these prefixes are not sent

Answer 4

Outbound route filter neighbor 10.0.255.9 capability orf prefix-list both

Question 5

Consider a router without a peer group with 150k routes and 3 peers, how many NRLI should be generated?

Answer 5

450k

Question 6

Feature that allows neighbors with the same outbound policies to be grouped automatically.

Answer 6

dynamic groups

Question 7

A neighbor can only inherit configurations directly from one session template but indirectly from up to 7

Answer 7

true

Question 8

A session template will inherit configurations from only other N session templates

Answer 8

false, a session template inherits configurations from only one other session template

Question 9

A policy template will inherit configurations from only other N policy templates

Answer 9

true

Question 10

A route received in an RR from an RR Client will be announced to other RR Clients and to other iBGP peers

Answer 10

true

Question 11

A route received in an RR from an iBGP Peer will be announced to other RR Clients and to other iBGP peers

Answer 11

false, it will be announced to other RR Clients but not to other iBGP peers

Question 12

In a confed scenario, the next_hop attribute is changed when a prefix is announced between SubASes

Answer 12

false, it is not modified

Question 13

In a confed scenario, the local_pref attribute is maintained when a prefix is announced between SubASes

Answer 13

true

Question 14

In a confed scenario, the med attribute is maintained when a prefix is announced between SubASes

Answer 14

true

Question 15

The AS_CONFED_SEQUENCE attribute is equivalent to which other attribute?

Answer 15

AS Path

Question 16

The shorter AS_CONFED_SEQUENCE influences the choice of the best path within a Confed AS

Answer 16

false

Question 17

Within which option of the TCP header does the MD5 hash of the BGP update go?

Answer 17

option 19

Question 18

MD5 hash also is calculated over IP and TCP headers, BGP authentication will work over devices performing Network Address Translation (NAT) or Port Address Translation (PAT)

Answer 18

false, will not work

Question 19

Whenever a password is configured, BGP sessions must be restarted

Answer 19

false, if the password configuration is done on both sides within the 180-sec window, there is no need to restart.

Question 20

In which method RTBH source or destination is uRPF combined with blackhole?

Answer 20

source

Question 21

Which feature is used to reduce processing caused by unstable routes

Answer 21

route flap dampening

Question 22

Which parameter of route dampening refers to the time interval in which the penalty falls by half?

Answer 22

half-life, 15 min

Question 23

Which parameter of route dampening limits the point at which the route becomes suppressed?

Answer 23

Suppress limit, 2000

Question 24

What is the default interval for BGP keepalives

Answer 24

60 secs

Question 25

What is the interval between BGP scan executions

Answer 25

60 secs

Question 26

What is the advertisement timer for eBGP and iBGP neighbors?

Answer 26

30 secs and 0

Question 27

even if the IP routing table indicates that the neighbor is no longer reachable, BGP will not trigger the convergence process until the BGP session hold-down timer expires.

Answer 27

true

Question 28

BGP convergence can also be improved to some extent by configuring a larger scan time interval for the BGP scanner process, configuring a larger advertisement interval between BGP neighbors, configuring smaller keepalive and hold-down timers.

Answer 28

false. BGP convergence can also be improved to some extent by configuring a smaller scan time interval for the BGP scanner process, configuring a smaller advertisement interval between BGP neighbors, configuring smaller keepalive and hold-down timers.

Question 29

Complete: ___________ is an optimization technique available on Cisco ____ Software platforms. characteristics: Supported on Cisco _____ Software only, splits BGP functionality into three process types with several instances: BGP process manager (one instance) BGP RIB process (one instance per address family) BGP speaker process (up to 15 instances) Used to reduce the impact that a fault in one address family has on another address family Must be enabled

Answer 29

Distributed BGP, IOS XR

Question 30

Distributed BGP is used to reduce the impact that a fault in one address family has on another address family,

Answer 30

true

Question 31

____ ______ is a method for maximizing the use of available bandwidth in the network between the endpoints of a TCP connection.

Answer 31

PMTU discovery

Question 32

The default TCP MSS for BGP traffic is____ bytes. Enabling path MTU discovery, and thus using a higher MSS for BGP traffic, can improve BGP convergence because____ packets are required to send BGP updates.

Answer 32

536, fewer

Question 33

The default input hold queue is platform-dependent and is __ on Cisco IOS Software platforms and____ on Cisco IOS XE Software platforms. Setting the length of an interface to 1000 will normally resolve problems that are caused by input queue drops of TCP ACKs.

Answer 33

75, 375

Question 34

What command increases the size of the input queue to avoid drops during BGP update exchanges?

Answer 34

R2(config-if)#hold-queue 1000 in

Question 35

BGP dynamic neighbors are configured using a range of IP addresses and BGP peer templates.

Answer 35

False. BGP dynamic neighbors are configured using a range of IP addresses and BGP peer group.

Question 36

Commands that configure dynamic peers, limited to 200 peers, and for a range of 172.16.0.0/24

Answer 36

bgp listen limit 200 bgp listen range 172.16.0.0/24 peer-group IX-PEERS

Question 37

Origin code: Egp > igp > incomplete

Answer 37

False Igp > egp > incomplete Na pratica igp > incomplete

Question 38

Feature that allows installing two or more routes as best in the BGP table

Answer 38

Bgp multi path

Question 39

Bgp multipath by default does not consider prefixes from different ASNs as eligible for multipath

Answer 39

true

Question 40

Bgp add path is a capability

Answer 40

true

Question 41

Bgp multi path allows a route reflector to announce two or more routes

Answer 41

false, that is the add path