H12-821_V1.0 · Question #692
Which of the following descriptions of the BGP Local_Preference attribute are correct? (Multiple choice)
The correct answer is A. You can modify the default Local_Preference value through the bgp default local-preference command. B. You can use the import direction policy on the AS border router to modify the Local_Preference attribute value. C. The default value of Local_Preference is 100. A, B, and C are all correct because Local_Preference defaults to 100, can be globally changed via bgp default local-preference, and can be modified on an AS border router using an inbound (import) route policy - a common technique to influence path selection for routes received…
Question
Options
- AYou can modify the default Local_Preference value through the bgp default local-preference command.
- BYou can use the import direction policy on the AS border router to modify the Local_Preference attribute value.
- CThe default value of Local_Preference is 100.
- DThe Local_Preference attribute can be passed between iBGP peers and EBGP peers.
How the community answered
(65 responses)- A72% (47)
- D28% (18)
Explanation
A, B, and C are all correct because Local_Preference defaults to 100, can be globally changed via bgp default local-preference, and can be modified on an AS border router using an inbound (import) route policy - a common technique to influence path selection for routes received from external peers.
Option D is wrong because Local_Preference is an iBGP-only attribute: it is exchanged between routers within the same AS but is stripped before being sent to eBGP peers. It carries no meaning outside the AS, so propagating it externally would be both meaningless and a security concern.
Memory tip: Think of Local_Preference as a "local vote" - it only counts inside the house (your AS). The higher the vote, the more preferred the exit path. Since it's internal-only, it never leaves the building to eBGP neighbors.
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