Refer to the exhibit.
Which configuration can you implement on PE-1 to allow CE-1 to receive delegated IPv6 prefixes?
A.
Exhibit A 
B.
Exhibit B 
C.
Exhibit C 
D.
Exhibit D 
E.
Exhibit E 
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why is A?
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B and C are not viable answers since the prefix notation is missing a double colon at the end of the prefix. It should read 2001:db8:4:8888::/XX. B is also missing “prefix-delegation” statement. C has an assigned length of 48 which is less than the prefix length of /56 and that is not allowed.
D and E are incorrect because their assigned lengths are less than their prefix lengths which is not allowed. Looking at the first line in each configuration: D has an assigned length of 32 and a prefix length of /48. E has an assigned length of 48 and a prefix length of /64.
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