Exam 350-501 topic 1 question 78 discussion

I'd say B because accepted should have community value 65001:200

C is wrong because has "and" instead of "or" in the first if, but will also allow any other prefixes D is also wrong because of the "done" action A will allow any other prefixes B is the right answer

B is the right answer.

Answers “B” is the only one that meet all requirement. Answer “A” and “C” let pass other routes than the requested /48. Answer “C” also has the “and” in the first “if” that is wrong. Answer “D” has that odd “>” symbol and the “done” statement the avoids adding the community to the route. https://www.cisco.com/c/en/us/td/docs/routers/xr12000/software/xr12k_r4-0/routing/configuration/guide/rc40xr12k_chapter7.html The done statement indicates that the action to take is to stop executing the policy and accept the route. When encountering a done statement, the route is passed and no further policy statements are executed. All modifications made to the route prior to the done statement are still valid.

B is the Correct answer

Pass – prefix allowed if not later dropped pass grants a ticket to defeat default drop Execution continues after pass Set – value changed, prefix allowed if not later dropped Any set at any level grants a ticket Execution continues after set Values can be set more than once Done – prefix allowed, stop execution Drop – prefix is discarded Explicit drop stops policy execution Implicit drop (if policy runs to end without getting a ticket)

the answer on the site is wrong. should be B

By process of elimination A: the command set community is outside all of the if validations, so a prefix different from 2001:db8:aaaa::/48, could still pass if it is not discarded in the validations that came before. C: Also has the set community outside the if validations. Also fails due to having the AND keyword, any of the conditions by themselves should discard a prefix. D: worse of all, the DONE keyword will inmediately exit the route-policy without changing the community.

I was doing logic on paper and B is the solution for me, all other choices would violate one or more policy items