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Which method must be used to ensure that the primary data center receives all traffic unless it is offline?

A company must acquire register IP address space from a regional Internet authority and multihome the Internet connection to multiple Internet service providers Due to limited IPv4 address availability the company was able to allocate only a /24 address block.

Which method must be used to ensure that the primary data center receives all traffic unless it is offline?
A . BGP: AS prepend at the secondary D
C . EIGRP: Advertise two 125 address blocks to each ISP at the primary DC and a /24 at the secondary D
E . BGP: Advertise two /25 address blocks to each ISP at the secondary DC and a 124 at the primary D
G . OSPF: AS prepend at the secondary D

Answer: A

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