Area 36 is a NSSA so R5 is an ASBR so we can summarize external routes using the “summaryaddress”
command. The command “area area-id range” can only be used on ABR so it is not correct.
The summarization must be done on the ASBR which is R5, not R4 so the correct answer must be
started with “R5(config)#router ospf 1”.
Note: The “no area” command is used to remove any existing “area …” command (maybe “area 56
range …” command).
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