A data center provider has designed a network using these requirements:
 Two data center sites are connected to the public Internet.
 Both data centers are connected to different Internet providers.
 Both data centers are also directly connected with a private
connection for the internal traffic, and public Internet traffic can also be
routed at this direct connection.
 The data center provider has only one /19 public IP address block.
Under normal conditions, Internet traffic should be routed directly to the data center where the
services are located. When one Internet connection fails, the complete traffic for both data
centers should be routed by using the remaining Internet connection. In which two ways can
this routing be achieved? (Choose two.)

A.
The data center provider must have an additional public IP address block for this routing.

B.
One /20 block is used for the first data center and the second /20 block is used for the
second data center.The /20 block from the local data center is sent out with a low BGP weight
and the /20 block from the remote data center is sent out with a higher BGP weight at both
sites.

C.
One /20 block is used for the first data center and the second /20 block is used for the
second data center.The /20 block from the local data center is sent out without path
prepending and the /20 block from the remote data center is sent out with path prepending at
both sites.

D.
One /20 block is used for the first data center and the second /20 block is used for the
second data center.Each /20 block is only sent out locally. The /19 block is sent out at both
Internet connections for the backup case to reroute the traffic through the remaining Internet
connection.

E.
One /20 block is used for the first data center and the second /20 block is used for the
second data center.The /20 block from the local data center is sent out with a low BGP local
preference and the /20 block from the remote data center is sent out with a higher BGP local
preference at both sites.

F.
BGP will always load-balance the traffic to both data center sites.