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Exam ANS-C00 topic 1 question 171 discussion

Exam question from Amazon's ANS-C00
Question #: 171
Topic #: 1
[All ANS-C00 Questions]

Your company currently has a LAG to AWS with two 1Gbps connections. What is the best way to increase throughput on this LAG?

  • A. Add three 1Gbps connections to the LAG.
  • B. Add one 10Gbps connections to the LAG.
  • C. Configure your router to use "jumbo frames" with an MTU of 9001.
  • D. Add two 1Gbps connections to the LAG.
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Suggested Answer: D 🗳️
Add two 1Gbps connections to the LAG. DX does not support jumbo frames, a LAG only supports 4 connections, and adding a 10Gbps connection will be limited to the lowest speed of 1Gbps.

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slackbot
2 years ago
question is throughput, not bandwidth. with single-flow TCP connections, whether you have 4G or 2G - it would most probably lead to the same throughput for 1460-byte MSS. better activate jumbo frames, which will increase the throughput. and - jumbo frames can be activated/deactivated per Connection, not only per VIF now, when we speak about UDP... then answer is D
upvoted 1 times
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2shyshy
3 years, 3 months ago
I would say Jumbo Frames, because using Jumbo Frames increases Throughput, adding more ports to the LAG increases Bandwidth.
upvoted 2 times
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ChauPhan
3 years, 7 months ago
A or D. But "You can have a maximum of two 100G connections, or four connections with a port speed less than 100G in a LAG" You have 2 and need to add 2 => 4 links in LAGs
upvoted 2 times
ChauPhan
3 years, 6 months ago
So D is the answer
upvoted 4 times
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eeghai7thioyaiR4
3 years, 7 months ago
Increasing MTU won't change your link speed All members in a LACP must have the same speed -> D
upvoted 2 times
JohnnyBG
3 years, 4 months ago
increasing MTU does improve throughput .. as well as adding more link .. again a poorly written question :-(
upvoted 2 times
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doubeguy
3 years, 7 months ago
DX supports MTU 9001 https://docs.aws.amazon.com/directconnect/latest/UserGuide/set-jumbo-frames-vif.html
upvoted 2 times
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doubeguy
3 years, 7 months ago
not 9001 but 9023 AWS Direct Connect supports an Ethernet frame size of 1522 or 9023 bytes (14 bytes Ethernet header + 4 bytes VLAN tag + bytes for the IP datagram + 4 bytes FCS) at the link layer. You can set the MTU of your private virtual interfaces. For more information, see Setting network MTU for private virtual interfaces or transit virtual interfaces. https://docs.aws.amazon.com/directconnect/latest/UserGuide/Welcome.html#overview_requirements
upvoted 1 times
ChauPhan
3 years, 6 months ago
They can call MTU=9001 because they don't count the payload into the Ethernet frame
upvoted 2 times
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jpvdham
3 years, 7 months ago
Option D. Although DX does allow a MTU of 9001 to a Private VIF.
upvoted 2 times
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Scunningham99
3 years, 8 months ago
D D D D https://docs.aws.amazon.com/directconnect/latest/UserGuide/lags.html
upvoted 3 times
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