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Exam ANS-C00 topic 1 question 17 discussion

Exam question from Amazon's ANS-C00
Question #: 17
Topic #: 1
[All ANS-C00 Questions]

You have to set up an AWS Direct Connect connection to connect your on-premises to an AWS VPC. Due to budget requirements, you can only provision a single
Direct Connect port. You have two border gateway routers at your on-premises data center that can peer with the Direct Connect routers for redundancy.
Which two design methodologies, in combination, will achieve this connectivity? (Choose two.)

  • A. Terminate the Direct Connect circuit on a L2 border switch, which in turn has trunk connections to the two routers.
  • B. Create two Direct Connect private VIFs for the same VPC, each with a different peer IP.
  • C. Terminate the Direct Connect circuit on any of the one routers, which in turn will have an IBGP session with the other router.
  • D. Create one Direct Connect private VIF for the VPC with two customer peer IPs.
  • E. Provision two VGWs for the VPC and create one Direct Connect private VIF per VGW.
Show Suggested Answer Hide Answer
Suggested Answer: AB 🗳️
by vikramrathode at June 22, 2019, 1:55 a.m.
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route53
Highly Voted 3 years, 7 months ago
A&B for me
upvoted 18 times
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BillyC
Highly Voted 3 years, 6 months ago
A and B
upvoted 6 times
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PavanKushwah123
Most Recent 2 years, 4 months ago
Correct Answer A D
upvoted 1 times
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Bobip
2 years, 10 months ago
The problem of this question is because the DX terminates in a single switch (Based on A.), we would face single point of failure situation in L2 level. Which means no redundancy anyway!
upvoted 1 times
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Aimee26
3 years, 1 month ago
A & B D is incorrect because; 'A virtual interface can support a single IPv4 BGP peering session and a single IPv6 BGP peering session.' https://docs.aws.amazon.com/directconnect/latest/UserGuide/add-peer-to-vif.html
upvoted 1 times
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Jazz888
3 years, 3 months ago
You certainly can add a BGP peering to the same Private VIF, but I think the catch is you can not publish the same IP family as the first peer. "A virtual interface can support a BGP peering session for IPv4, IPv6, or one of each (dual-stack). You cannot create multiple BGP sessions for the same IP addressing family on the same virtual interface." Check step 4 - table Peer IP Addresses on the link. https://docs.aws.amazon.com/directconnect/latest/UserGuide/getting_started.html I go for A and B
upvoted 1 times
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Emushu
3 years, 4 months ago
B is not a good answer b/c of the statement of the question "Due to financial constraints, you are only able to supply one Direct Connect port"
upvoted 1 times
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ceros399
3 years, 4 months ago
Selected Answer: AB
It's documented that you can have more than one peer IP for VIPs but it is only supported on limited regions.
upvoted 1 times
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mabalon
3 years, 5 months ago
Selected Answer: AB
A - > you need a switch in order to connect each onpremise router to each virtual private interface. Each virtual interface have different VLAN-ID b -> Create two VIF with different VLans-ID, different Peers but same ASN. https://aws.amazon.com/es/blogs/networking-and-content-delivery/creating-active-passive-bgp-connections-over-aws-direct-connect/ C-> Possible but without routers redundancy D-> Incorrect, you cannot create 1 VIF with 2 different customer peer IP E -> Incorrect, only one VGW per VPC
upvoted 3 times
Balki
2 years, 4 months ago
An answer without an explanation is like a Country without Covid-19. Best answer
upvoted 1 times
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JoshuaAlkar
2 years, 11 months ago
best explanation
upvoted 1 times
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AlirezaNetWorld
3 years, 5 months ago
D should be correct; BGP-wise, it's supposed to be possible to bring up two BGP neighborships over one connection. So, the correct answers are A and D
upvoted 1 times
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Jshuen
3 years, 6 months ago
A,D in some DX locations, you can create 2 BGP peers in 1 VIF https://docs.aws.amazon.com/directconnect/latest/UserGuide/add-peer-to-vif.html
upvoted 2 times
Jshuen
3 years, 6 months ago
revisit the doc again but found the statement said some DX locations support 2 BGP peer removed, thus each VIF supports 1 bgp peer only and D should be incorrect
upvoted 1 times
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Globetrotter
3 years, 7 months ago
A and B looks good, but guys still it is a single point of failure right , what happens if the switch fails
upvoted 4 times
CloudTrail
3 years, 6 months ago
Switch can be a stack
upvoted 3 times
JamesTR
3 years, 6 months ago
@ CloudTrail But if main switch in the stack fails, you will have to physically connect direct connect fiber to second switch, or rather ask Direct Connect location to move the cable. Will they do that without new LOA ?
upvoted 1 times
student2020
3 years, 6 months ago
If its your switch that fails, you move the connection to another switch, not need for DX location to do anything on the AWS router side where the LOA is required
upvoted 2 times
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aviz
3 years, 7 months ago
Can anyone help me explain this question?
upvoted 1 times
HazemYousry
3 years, 7 months ago
A- Correct B- Correct C- Doesn't make any value with redundancy D- You cannot create 1 VIF with 2 different customer peer IP E- You can only have one VGW per VPC
upvoted 15 times
PeppaPig
3 years, 6 months ago
E- more precisely, you can only have one VGW attached per VPC
upvoted 2 times
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vikramrathode
3 years, 7 months ago
answer should be B. D is incorrect as you cannot create 1 VIF with 2 different customer peer IP's
upvoted 5 times
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