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Exam AWS Certified Advanced Networking - Specialty ANS-C01 topic 1 question 226 discussion

Exam question from Amazon's AWS Certified Advanced Networking - Specialty ANS-C01
Question #: 226
Topic #: 1
[All AWS Certified Advanced Networking - Specialty ANS-C01 Questions]

A company is running its application servers on Amazon EC2 instances. The EC2 instances run in separate VPCs that are connected by a transit gateway. The EC2 instances launch in a private subnet with a route to the transit gateway for internal and external connectivity. The external connectivity is provided by a VPC with firewall devices that perform an inspection for packets that ingress and egress through an internet gateway.

A network engineer needs to help the company’s application team increase the payload size per packet delivery between the EC2 instances. All network connectivity must be through the transit gateway

What should the network engineer do to meet these requirements?

  • A. Enable jumbo frames on the transit gateway. Instruct the application team to set the maximum transmission unit (MTU) of the system’s network interfaces to 9001 bytes.
  • B. Instruct the application team to set the maximum transmission unit (MTU) of the VPC to 8500 bytes.
  • C. Instruct the application team to set up enhanced networking on the system by using the enhanced networking adapter. Set the maximum transmission unit (MTU) to 9001 bytes.
  • D. Instruct the application team to set the maximum transmission unit (MTU) of the system’s network interfaces to 8500 bytes.
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Suggested Answer: D 🗳️
by ArunRav at Nov. 19, 2024, 4:31 a.m.
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ashk123456
1 month ago
Selected Answer: A
To achieve jumbo frame support, the MTU should be set to 9001 bytes, not 8500 bytes.
upvoted 1 times
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49ca6f2
2 months, 3 weeks ago
Selected Answer: C
I think answer is C. TGW supports 8500 MTU by default and enforces MSS Clamping on all traffic. Hence if the EC2 is 9001 with Enhanced networking , MSS clamping on TGW will ensure that EC2 sends only 8500 and does not exceeds the MTU of TGW.
upvoted 1 times
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woorkim
4 months, 1 week ago
Selected Answer: D
The correct answer is D because: 8500 bytes is the maximum MTU supported by Transit Gateway Setting the system interfaces to 8500 ensures compatibility Prevents packet fragmentation Maximizes payload size while maintaining network stability Works with the existing architecture including firewalls
upvoted 2 times
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0acf5ca
4 months, 3 weeks ago
Selected Answer: D
D - All network connectivity between EC2 instances must be through the transit gateway. Although MTU 9001 is enabled on EC2 by default and MTU 8500 is enabled on TGW by default, any frame more than 8500 bytes would be silently dropped by TGW.
upvoted 1 times
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a4002bd
5 months ago
Selected Answer: D
https://docs.aws.amazon.com/vpc/latest/tgw/transit-gateway-quotas.html D. Packets with a size larger than 8500 bytes that arrive at the transit gateway are dropped.
upvoted 1 times
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304faa7
5 months, 2 weeks ago
Correct Answer is D
upvoted 1 times
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Momiac5
5 months, 2 weeks ago
D Question: "All network connectivity must be through the transit gateway" Docs: Packets with a size larger than 8500 bytes that arrive at the transit gateway are dropped. https://docs.aws.amazon.com/vpc/latest/tgw/transit-gateway-quotas.html
upvoted 3 times
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ArunRav
5 months, 2 weeks ago
Selected Answer: A
Enabling Jumbo frames and setting up MTU of the network interfaces to 9001 will help to improve the connectivity.
upvoted 1 times
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