Topic 1 Question 38
A company has deployed a software-defined WAN (SD-WAN) solution to interconnect all of its offices. The company is migrating workloads to AWS and needs to extend its SD-WAN solution to support connectivity to these workloads. A network engineer plans to deploy AWS Transit Gateway Connect and two SD-WAN virtual appliances to provide this connectivity. According to company policies, only a single SD-WAN virtual appliance can handle traffic from AWS workloads at a given time. How should the network engineer configure routing to meet these requirements?
Add a static default route in the transit gateway route table to point to the secondary SD-WAN virtual appliance. Add routes that are more specific to point to the primary SD-WAN virtual appliance.
Configure the BGP community tag 7224:7300 on the primary SD-WAN virtual appliance for BGP routes toward the transit gateway.
Configure the AS_PATH prepend attribute on the secondary SD-WAN virtual appliance for BGP routes toward the transit gateway.
Disable equal-cost multi-path (ECMP) routing on the transit gateway for Transit Gateway Connect.
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A - incorrect , static routes are not possible in TGW B- incorrect, these BGP communities are used for BGP over DX C- correct , AS_PATH prepending is a standard BGP way of influencing return traffic for advertised prefixes and SDWAN supports this. D- incorrect, disabling ECMP will make sure the SDWAN>TGW traffic is not load shared, but the return traffic TGW>SDWAN is not affected and therefore both appliances will process traffic.
👍 5dremm2023/04/02Option C - focuses specifically on the SD-WAN virtual appliances. By configuring the AS_PATH prepend attribute on the secondary SD-WAN virtual appliance for BGP routes toward the transit gateway, the network engineer can influence routing preferences, making the primary SD-WAN virtual appliance the preferred path while keeping the secondary appliance as a backup. This approach meets the company's requirement of having only a single SD-WAN virtual appliance handle traffic from AWS workloads at a given time without impacting other connections.
👍 4zaazanuna2023/03/26- 正解だと思う選択肢: C
C is correct
👍 4silviahdz2023/04/15
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