BPG 2.0

Question 1

Can MED be configured via redistribution, inbound, and outbound updates?

Answer 1

true

Question 2

MED must be regenerated when set by an iBGP peer to allow its propagation to an eBGP peer, it can be reset, incremented, or decremented

Answer 2

true

Question 3

By default, MED is used as a tie-breaker when the same prefix is received from different ASes

Answer 3

false

Question 4

By default, announcements without MED receive the worst value

Answer 4

false, the best value. This can be changed: bgp bestpath med missing-as-worst

Question 5

The BGP bestpath med always should be activated only on edge routers

Answer 5

false, it must be consistent throughout the network to avoid loops

Question 6

What are the 3 types of communities and their lengths?

Answer 6

Standard: 32 bits > 16:16, Extended: 64 bits: 16 type 32:16 or 16:32, Large: 96 bits: 32:32:32

Question 7

What is the proposed structure for large communities?

Answer 7

32 bits - Source AS > 32 Bits action > 32 bits destination AS

Question 8

When a route is reflected, the reflector creates the BGP Cluster List attribute and attaches it to the route if it does not exist

Answer 8

true

Question 9

If the route is received by a route reflector in the same cluster, it will recognize its cluster ID number in the cluster list and accept it

Answer 9

false

Question 10

The route reflector client sets an extra BGP attribute, called Originator ID

Answer 10

False, the first RR at the moment of reflection. The RR sets the Originator = client that originates the prefix.

Question 11

The Originator ID does not prevent RR Clients from receiving looped routes

Answer 11

false, it does prevent

Question 12

Reflected routes are preferred over non-reflected routes.

Answer 12

false, reflected routes are worse than non-reflected routes

Question 13

Reflected routes with a smaller cluster list are preferred

Answer 13

true, same concept as the AS path

Question 14

What two attributes are modified by the RR when reflecting the route?

Answer 14

Cluster List and Originator ID

Question 15

Reflected routes between RRs with the same cluster ID are accepted

Answer 15

false

Question 16

RR Clients need to have sessions with all RRs in a clustered environment

Answer 16

true, because RRs in a cluster do not exchange routes with each other

Question 17

It is necessary for the client to have sessions with RRs from different clusters

Answer 17

false, the Client must have sessions only with all RRs of a single cluster to avoid receiving duplicate routes

Question 18

In intraconfed eBGP sessions, the AS Path is not modified

Answer 18

false, it is modified

Question 19

In intraconfed iBGP sessions, the AS Path is not modified

Answer 19

true

Question 20

In intraconfed sessions, the BGP process uses the Public AS

Answer 20

false, private

Question 21

In intraconfed sessions, what command identifies the Public AS?

Answer 21

bgp confederation identifier {{public_as}}

Question 22

In intraconfed sessions, what command identifies the private ASes with which sessions should be accepted?

Answer 22

bgp confederation peer {{private_as1}} {{private_as2}}

Question 23

There is no need for eBGP multihop in intraconfed eBGP sessions

Answer 23

false, it is necessary if the peer is not directly connected

Question 24

A migration to confederation can be done gradually

Answer 24

false, all routers need to be reconfigured

Question 25

In intraconfed sessions, there is no need to list the AS of the process as bgp confed peer

Answer 25

true

Question 26

In IOS XR, what is the commit best-effort command used for?

Answer 26

Apply only the valid part of the configuration, ignoring errors

Question 27

BGP Prefix Limit is enabled by default in all Cisco systems

Answer 27

false, only in IOS-XR

Question 28

What is the neighbor limit for IOS XR?

Answer 28

4000

Question 29

What are the possible actions and the default when a peer exceeds the number of prefixes?

Answer 29

Possible actions: warning only and cease peering, default is cease. IOS XR also has discard-extra-paths, IOS XE does not

Question 30

What feature is equivalent to soft configuration inbound?

Answer 30

route refresh

Question 31

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

Answer 31

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

Question 32

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

Answer 32

Outbound route filter, neighbor 10.0.255.9 capability orf prefix-list both

Question 33

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

Answer 33

450k