Sorry,
I didn't pay enough attention to answer D.
D is totally excluded, because the Weight controls the outbound traffic, not the inbound.
The correct answer is A
As many other questions, cisco tries to makes these questions more stupid instead of more difficult.
It is not clear if question is about inbound traffic or inbound bgp routes.
If is about inbound traffic (inbound traffic path), then A is correct
If it is about inbound BGP updates (received BGP routes with multiple next-hops or paths), then D is correct
A is the correct answer.
BGP can influence inbound path selection using one of the following BGP attributes:
1. AS-path
2. Multi-Exit Discriminator (MED)
Influencing Inbound Path Selection by Modifying the AS_PATH Attribute:
router bgp 40000
neighbor 192.168.1.2 remote-as 45000
!
address-family ipv4
neighbor 192.168.1.2 activate
neighbor 192.168.1.2 route-map PREPEND out
!
route-map PREPEND permit 10
set as-path prepend 40000 40000
https://content.cisco.com/chapter.sjs?uri=/searchable/chapter/content/en/us/td/docs/ios-xml/ios/iproute_bgp/configuration/xe-3e/irg-iproute-bgp-xe-3e-book/irg-prefix-filter.html.xml
Weight attribute is used to influence "Outbound" traffic, not "Inbound".
"AS Path prepending" feature is used to make one route preferred or less preferred, so ISPs can make forwarding decisions when sending the traffic to us (inbound traffic from our perspective).
"A", is definitely correct.
upvoted 1 times
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