Exam 400-007 All Questions

View all questions & answers for the 400-007 exam

Exam 400-007 topic 1 question 187 discussion

Actual exam question from Cisco's 400-007

Question #: 187
Topic #: 1

A customer migrates from a traditional Layer 2 data center network into a new SDN-based spine-and-leaf VXLAN EVPN data center within the same location. The networks are joined to enable host migration at Layer 2. Which activity should be completed each time a legacy network is migrated?

A. The migrated network should be added to the EVPN BGP routing
B. The migrated network should have a VXLAN VNID configured within the new network
C. The migrated VLAN should be pruned from the Layer 2 interconnects
D. The migrated network should be advertised to the EVPN network as a Type 2 network

Show Suggested Answer

Suggested Answer: C 🗳️

by ying162 at Feb. 7, 2023, 10:15 p.m.

Comments

Submit Cancel

schwabenschulle

Highly Voted 1 year, 11 months ago

Based on the provided answers I would almost go with C. The legacy network is already migrated and I assume this includes all applications. In this case it would make sense to prune the vlan from the L2 migration link to get rid of STP TCN ... . Which still could get send due to flappigng trunk port or wrong configured access ports in legacy. Looking for other opinions. -

upvoted 17 times

pizdecvsemu

1 year, 11 months ago

I agree, all is configured and moved, it's time to prune.

upvoted 2 times

...

mostafabebers

1 year, 9 months ago

I agree, it's asked when the legacy network is migrated (after all migration tasks has been finished)

upvoted 2 times

...

Feraso

Most Recent 10 months, 3 weeks ago

Selected Answer: C

ans is C as per https://www.cisco.com/c/en/us/td/docs/dcn/whitepapers/migrating-classic-ethernet-to-vxlan-bgp-evpn-white-paper.html

upvoted 2 times

...

blurain

1 year ago

Selected Answer: B

No mentions the endpoints network needs to be advertised/routed. But if that is the case, pruning the VLAN from the L2 interconnect will isolate the endpoints from the rest of the network. Prudent to just go with an answer covering our question's requirements.

upvoted 1 times

...

JamesBlunt

1 year, 7 months ago

Selected Answer: C

Network is migrated already. A, B and D (if it did make sense) already happened. So, C. Ref:https://www.cisco.com/c/en/us/td/docs/dcn/whitepapers/migrating-classic-ethernet-to-vxlan-bgp-evpn-white-paper.html "Decommission Layer 2 Interconnect Although the Layer 3 external connectivity or interconnect might remain necessary for the lifecycle of the remaining resources in the brownfield network, the Layer 2 interconnect for the first-hop gateway can be decommissioned once the workload migration is complete. It is a good practice not to have any Layer 2 interconnects if they are not required, to avoid any possibility of Layer 2 loops (Figure 31)."

upvoted 3 times

...

Jentti

1 year, 8 months ago

Selected Answer: C

After all hosts are migrated to fabric, you must prune the VLAN away for fault isolation purposes.

upvoted 2 times

...

J_W

1 year, 8 months ago

Selected Answer: C

C. The migrated VLAN should be pruned from the Layer 2 interconnects.

upvoted 2 times

...

Estoks7

1 year, 8 months ago

Selected Answer: C

https://www.cisco.com/c/en/us/td/docs/dcn/whitepapers/migrating-classic-ethernet-to-vxlan-bgp-evpn-white-paper.html

upvoted 1 times

...

bdp123

1 year, 9 months ago

Selected Answer: C

Decommission Layer 2 Interconnect Although the Layer 3 external connectivity or interconnect might remain necessary for the lifecycle of the remaining resources in the brownfield network, the Layer 2 interconnect for the first-hop gateway can be decommissioned once the workload migration is complete. It is a good practice not to have any Layer 2 interconnects if they are not required, to avoid any possibility of Layer 2 loops https://www.cisco.com/c/en/us/td/docs/dcn/whitepapers/migrating-classic-ethernet-to-vxlan-bgp-evpn-white-paper.html

upvoted 1 times

...

gcpengineer

1 year, 11 months ago

Selected Answer: B

B. his VNID provides a unique identifier for the network within the VXLAN overlay, which allows the network to be identified and properly routed within the new network. This is a key step in enabling host migration at Layer 2.

upvoted 2 times

...