Exam JN0-648 topic 1 question 45 discussion

D Source: https://www.juniper.net/documentation/en_US/junos/topics/usage-guidelines/policy-defining-bgp-communities-and-extended-communities-for-use-in-routing-policy-match-conditions.html no-advertise—Routes in this community name must not be advertised to other BGP peers. no-export—Routes in this community must not be advertised outside a BGP confederation boundary. A stand alone autonomous system that is not part of a confederation should be considered a confederation itself. no-export-subconfed—Routes in this community must not be advertised to external BGP peers, including peers in other members’ ASs inside a BGP confederation.

ed@vMX-PE1# run show route 10.0.24.0/24 inet.0: 14 destinations, 18 routes (14 active, 0 holddown, 0 hidden) + = Active Route, - = Last Active, * = Both 10.0.24.0/24 *[BGP/170] 00:02:55, localpref 200, from 2.2.2.2 AS path: I, validation-state: unverified > to 10.0.0.2 via em0.2, label-switched-path TO-vMX_R2 [Static/250] 00:01:27 > via ipip.0 [edit] ed@vMX-PE1# run show route 10.0.24.0/24 extensive | match Comm Communities: no-export [edit] ed@vMX-PE1# run show route advertising-protocol bgp 10.0.13.3 [edit] ed@vMX-PE1#

Answer is D no-advertise means — Do not advertise this route to any peer, internal or external. no-export means — Do not advertise to eBGP peers. Keep this route within an AS. https://routersysco.wordpress.com/2011/12/21/bgp-community-attribute-no-advertise-no-export/#:~:text=%2Dno%2Dadvertise%20means%E2%80%94Do,this%20route%20within%20an%20AS.

no-advertise is correct answer no-advertise—Routes containing this community name are not advertised to other BGP peers. https://www.juniper.net/documentation/en_US/junos/topics/reference/configuration-statement/community-edit-policy-options.html

https://www.juniper.net/documentation/en_US/junos/topics/usage-guidelines/policy-defining-bgp-communities-and-extended-communities-for-use-in-routing-policy-match-conditions.html

i think it should be D, because it's not a BGP Confed right ?

It should be 'C'. local-as (also known as no-export-subconfed) https://www.juniper.net/documentation/en_US/junose15.1/topics/concept/routing-policy-community-list-overview.html