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Exam AZ-700 topic 2 question 56 discussion

Actual exam question from Microsoft's AZ-700
Question #: 56
Topic #: 2
[All AZ-700 Questions]

You have the on-premises networks shown in the following table.



You have an Azure subscription that contains an Azure virtual WAN named VWAN1 and a virtual network named VNet1. VWAN is connected to the on-premises networks and VNet1 in a full mesh topology. The virtual hub routing preference for VWAN1 is AS Path.

You need to route traffic from VNet1 to 10.61.1.5.

Which path will be used?

  • A. the VPN connection to Branch1
  • B. the VPN connection to Branch2
  • C. the ExpressRoute connection to Branch2
  • D. the ExpressRoute connection to Branch3
Show Suggested Answer Hide Answer
Suggested Answer: D 🗳️
by crypto700 at May 11, 2023, 1:24 a.m.

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crypto700
Highly Voted 2 years ago
Selected Answer: D
D- Branch3 for two reasons 1- VWAN prefers ER over VPN 2- it doesn't have BGP prepend .. Branch 2 has three AS hops so it is less preferred
upvoted 22 times
stormtraining
6 months, 2 weeks ago
don't agree: ANSWER should be C. the ExpressRoute connection to Branch2 Explanation: Since the virtual hub routing preference for VWAN1 is based on AS Path, and Branch2's ExpressRoute connection has the shortest AS path length compared to Branch1 (VPN) and Branch3 (ExpressRoute), traffic will prefer the connection with the shortest AS path.
upvoted 1 times
billgoldberg14
3 months, 3 weeks ago
How did you come up with the idea that branch 2 has the shortest AS path? It says in the description for branch 2 that the local AS is listed 3 times indicating it's doing as-path prepending. As far as we know, branch 3 is not doing any prepending....so Answer is D, Branch 3.
upvoted 1 times
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thekhijir
6 months, 1 week ago
By default, VWAN prefers ExpressRoute connections over VPN connections for routing traffic. This is because ExpressRoute typically offers more reliable and higher bandwidth connections compared to VPN. Also, for BGP, /24 is always preferred over /16 as it's the longest match.
upvoted 2 times
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thekhijir
Most Recent 6 months, 1 week ago
Selected Answer: D
By default, VWAN prefers ExpressRoute connections over VPN connections for routing traffic. This is because ExpressRoute typically offers more reliable and higher bandwidth connections compared to VPN. Also, for BGP, /24 is always preferred over /16 as it's the longest match.
upvoted 2 times
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620b351
8 months, 3 weeks ago
Selected Answer: D
Crypto 700 is correct. In basic BGP, one of the most common tiebreakers (and in this example as well) is the AS path. If the AS path is bigger, it has less preference. What is done here is called an AS prepend, where the AS path is influenced, so branch 2 is totally out.
upvoted 1 times
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cda26aa
1 year ago
Answer should A. AS Path Prefer routes with the shortest BGP AS-Path length irrespective of the source of the route advertisements. Note: In vWANs with multiple remote virtual hubs, if there's a tie between remote ExpressRoute routes and remote site-to-site VPN routes, remote site-to-site VPN routes will be preferred. Prefer routes from local virtual hub connections over routes learned from remote virtual hub. If there are routes from both ExpressRoute and Site-to-site VPN connections: If all the routes are local to the virtual hub, the routes from ExpressRoute connections will be chosen. If all the routes are through remote virtual hubs, the routes from Site-to-site VPN connections will be chosen. https://learn.microsoft.com/en-us/azure/virtual-wan/about-virtual-hub-routing-preference#routing-scenarios
upvoted 2 times
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LieJ0n
1 year, 1 month ago
D - Branch 3 See the example at https://learn.microsoft.com/en-us/azure/virtual-wan/about-virtual-hub-routing-preference#routing-scenarios
upvoted 2 times
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ronin201
1 year, 7 months ago
Pls carefully see ASN!!! ER uses standard ASN 12076 not mentioned in BGP AS
upvoted 1 times
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CiscoTerminator
1 year, 9 months ago
Answer is expressroute and not because of the answers I see below but this: AS Path Prefer routes with the shortest BGP AS-Path length irrespective of the source of the route advertisements. For example, whether the routes are learned from on-premises connected via S2S VPN or ER. Prefer routes from connections local to the virtual hub over routes learned from remote hub. If there are routes from both ER and S2S VPN connections, then see below. Else proceed to the next rule. If all the routes are local to the virtual hub, then choose routes from ER connections. If all the routes are through remote virtual hubs, then choose routes from S2S VPN connections. hence routes local to HUB, choose ER over S2S.
upvoted 1 times
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CristianM99
1 year, 9 months ago
D Crypto700 explanation is right.
upvoted 1 times
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Lazylinux
1 year, 10 months ago
Selected Answer: D
D is answer ER is preferred over VPN S2S all time and also Nothing appended to it in terms of AS
upvoted 1 times
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roshingrg
1 year, 11 months ago
B. the VPN connection to Branch2 The AS Path routing preference in the virtual hub (VWAN1) will determine the path selection. In this case, the AS Path for Branch2 includes a prefix of ExpressRoute (64551,64551,64551), indicating that traffic should be routed through the ExpressRoute connection to Branch2. However, the VPN connection to Branch2 has a more specific IP address space (10.50.0.0/16) than the ExpressRoute connection to Branch3 (10.50.2.0/24). Since the destination IP address (10.61.1.5) falls within the IP address space of the VPN connection to Branch2, the traffic will be routed through the VPN connection to Branch2. Therefore, the correct path for routing traffic from VNet1 to 10.61.1.5 is the VPN connection to Branch2.
upvoted 2 times
roshingrg
1 year, 11 months ago
Apologies for the confusion in my previous response. Let's reassess the routing based on the updated information: Given the following information: Branch1: 64551, 10.50.0.0/24, VPN Branch2: 64551, 10.50.0.0/16, VPN, AS Path has a prefix of ExpressRoute (64551, 64551, 64551) Branch3: 64551, 10.50.2.0/24, 10.61.0.0/16, ExpressRoute You need to route traffic from VNet1 to 10.61.1.5. In this case, the AS Path for Branch2 includes a prefix of ExpressRoute, indicating that traffic can be routed through the ExpressRoute connection to Branch2. However, the destination IP address (10.61.1.5) does not fall within the IP address spaces of Branch1 or Branch2. Branch3 has an IP address space (10.61.0.0/16) that includes the destination IP address (10.61.1.5). Although Branch3 is connected via ExpressRoute and doesn't have an AS Path, the destination IP address matches its IP address space. Therefore, the correct path for routing traffic from VNet1 to 10.61.1.5 is: D. the ExpressRoute connection to Branch3
upvoted 3 times
jayrush
1 year, 7 months ago
all 3 branch has the 10.61.0.0/16 range
upvoted 4 times
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Kipper_2022
2 years ago
Selected Answer: D
Agree with crypto700
upvoted 1 times
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