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Exam 400-007 All Questions
Exam 400-007 All Questions

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Cisco CCDE v3.0 | CCDE 400-007 Question # 75 Topic 8 Discussion

400-007 Exam Topic 8 Question 75 Discussion:
Question #: 75
Topic #: 8

Refer to the exhibit.

400-007 Question 75

Refer to the exhibit. Two data center sites (X and Y) connect to the Internet and each other using a backdoor link. Both advertise the same IP prefix (100.75.10.0/23) to the Internet. Firewalls are behind R1 and R2.

Problem: When users attempt to reach 100.75.10.0/23, the return traffic is routed to Site-Y, regardless of where the session originated. This results in asymmetric traffic and potentially broken sessions due to firewall behavior.

Which design resolves the issue?


A.

Use BGP MED to influence Site-X return traffic. Change the IP address scheme of both sites.


B.

Change the Site-Y firewall configuration to replicate the Site-X configuration. Advertise the low MED attribute on Site-X to the Internet.


C.

Add a static route toward the Internet on Site-X. Change the DNS policy on Site-Y to block traffic.


D.

Establish control plane peering between edge routers. Have Site-X advertise an IP pool with a longer prefix.


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