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Refer to the exhibit.

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Refer to the exhibit.

An engineer must design a WAN solution so that ISP-1 is always preferred over ISP-2. The path via ISP-2 is

considered as a backup and must be used only when the path to ISP-1 is down. Which

solution must the engineer choose?

A.

R1:

- Routes advertised to ISP-1: 0x AS-path prepend

- Routes received from ISP-1: HIGH local-preference

- Routes advertised to R2: no action

- Routes received from R2: community NO-EXPORT

R2:

- Routes advertised to ISP-2:5x AS-path prepend

- Routes received from ISP-2: LOW local-preference

- Routes advertised to R1: community NO-ADVERTISE

- Routes received from R1: no action

B.

R1:

- Routes advertised to ISP-1: 0x AS-path prepend

- Routes received from ISP-1: HIGH local-preference

- Routes advertised to R2: community NO-EXPORT

- Routes received from R2: no action

R2:

- Routes advertised to ISP-2: 5x AS-path prepend

- Routes received from ISP-2: LOW local-preference

- Routes advertised to R1: no action

- Routes received from R1: no action

C.

R1:

- Routes advertised to ISP-1: 0x AS-path prepend

- Routes received from ISP-1: LOW local-preference

- Routes advertised to R2: community NO-ADVERTISE

- Routes received from R2: no action

R2:

- Routes advertised to ISP-2: 5x AS-path prepend

- Routes received from ISP-2: HIGH local-preference

- Routes advertised to R1: no action

- Routes received from R1: community NO-ADVERTISE

D.

R1:

- Routes advertised to ISP-1: 5x AS-path prepend

- Routes received from ISP-1: LOW local-preference

- Routes advertised to R2: community NO-ADVERTISE

- Routes received from R2: no action

R2:

- Routes advertised to ISP-2: 0x AS-path prepend

- Routes received from ISP-2: HIGH local-preference

- Routes advertised to R1: community NO-EXPORT

- Routes received from R1: no action

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