Topic 1, Litware. Inc Case Study 1

Overview

Litware. Inc. is a financial company that has a main datacenter in Boston and 20 branch offices across the United States. Users have Android, iOS, and Windows 10 devices.

Existing Environment:

Hybrid Environment

The on-prernises network contains an Active Directory forest named litwareinc.com that syncs to an Azure Active Directory (Azure AD) tenant named litwareinc.com by usinq Azure AD Connect.

All the offices connect to a virtual network named Vnetl by using a Site-to-Site VPN connection.

Azure Environment

Litware has an Azure subscription named Sub1 that is linked to the litwareinc.com Azure AD tenant.

Sub1 contains resources in the East US Azure region as shown in the following table.

There is bidirectional peering between Vnet1 and Vnet2. There is bidirectional peering between Vnet1 and Vnet3. Currently, Vnet2 and Vnet3 cannot communicate directly.

Requirements:

Business Requirements

Litware wants to minimize costs whenever possible, as long as all other requirements are met.

Virtual Networking Requirements

Litware identifies the following virtual networking requirements:

* Direct the default route of 0.0.0.0/0 on Vnet2 and Vnet3 to the Boston datacenter over an ExpressRoute circuit.

* Ensure that the records in the cloud.litwareinc.com zone can be resolved from the on-premises locations.

* Automatically register the DNS names of Azure virtual machines to the cloud.litwareinc.com zone.

* Minimize the size of the subnets allocated to platform-managed services.

* Allow traffic from VMScaleSet1 to VMScaleSet2 on the TCP port 443 only.

Hybrid Networking Requirements

Litware identifies the following hybrid networking requirements:

* Users must be able to connect to Vnet1 by using a Point-to-Site (P2S) VPN when working remotely. Connections must be authenticated by Azure AD.

* Latency of the traffic between the Boston datacenter and all the virtual networks must be minimized.

* The Boston datacenter must connect to the Azure virtual networks by using an ExpressRoute FastPath connection.

* Traffic between Vnet2 and Vnet3 must be routed through Vnet1.

PaaS Networking Requirements

Litware identifies the following networking requirements for platform as a service (PaaS):

* The storage1 account must be accessible from all on-premises locations without exposing the public endpoint of storage1.

* The storage2 account must be accessible from Vnet2 and Vnet3 without exposing the public endpoint of storage2.

You need to connect Vnet2 and Vnet3. The solution must meet the virtual networking requirements and the business requirements.

Which two actions should you include in the solution? Each correct answer presents part of the solution. NOTE: Each correct selection is worth one point.

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DRAG DROP

You need to prepare Vnet1 for the deployment of an ExpressRoute gateway. The solution must meet the hybrid connectivity requirements and the business requirements.

Which three actions should you perform in sequence for Vnet1? To answer, move the appropriate actions from the list of actions to the answer area and arrange them in the correct order.

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Correct Answer:

HOTSPOT

You need to implement a P2S VPN for the users in the branch office. The solution must meet the hybrid networking requirements.

What should you do? To answer, select the appropriate options in the answer area. NOTE: Each correct selection is worth one point.

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Correct Answer:

Explanation:

Reference: https://docs.microsoft.com/en-us/azure/vpn-gateway/openvpn-azure-ad-tenant

You need to provide connectivity to storage1. The solution must meet the PaaS networking requirements and the business requirements.

What should you include in the solution?

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HOTSPOT

You need to recommend a configuration for the ExpressRoute connection from the Boston datacenter. The solution must meet the hybrid networking requirements and business requirements.

What should you recommend? To answer, select the appropriate options in the answer area. NOTE: Each correct selection is worth one point.

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Correct Answer:

Explanation:

For the first question, only ExpressRoute GW SKU Ultra Performance support FastPath feature. For the second question, vnet1 will connect to ExpressRoute gw, once Vnet1 peers with Vnet2, the traffic from on-premise network will bypass GW and Vnet1, directly goes to Vnet2, while this feature is under public preview.

Reference: ExpressRoute virtual network gateway is designed to exchange network routes and route network traffic. FastPath is designed to improve the data path performance between your on-premises network and your virtual network. When enabled, FastPath sends network traffic directly to virtual machines in the virtual network, bypassing the gateway.

To configure FastPath, the virtual network gateway must be either:

Ultra Performance

ErGw3AZ

VNet Peering – FastPath will send traffic directly to any VM deployed in a virtual network peered to the one connected to ExpressRoute, bypassing the ExpressRoute virtual network gateway.

https://docs.microsoft.com/en-us/azure/expressroute/about-fastpath

Gateway SKU

https://docs.microsoft.com/en-us/azure/expressroute/expressroute-about-virtual-network-gateways

DRAG DROP

You need to implement outbound connectivity for VMScaleSet1. The solution must meet the virtual networking requirements and the business requirements.

Which three actions should you perform in sequence? To answer, move the appropriate actions from the list of actions to the answer area and arrange them in the correct order. T

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Correct Answer:

Explanation:

Reference:

https://docs.microsoft.com/en-us/azure/load-balancer/skus

https://docs.microsoft.com/en-us/azure/load-balancer/load-balancer-outbound-connections#outboundrules

You need to configure the default route in Vnet2 and Vnet3. The solution must meet the virtual networking requirements.

What should you use to configure the default route?

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HOTSPOT

You need to restrict traffic from VMScaleSet1 to VMScaleSet2. The solution must meet the virtual networking requirements.

What is the minimum number of custom NSG rules and NSG assignments required? To answer, select the appropriate options in the answer area. NOTE: Each correct selection is worth one point.

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Correct Answer:

Explanation:

To restrict traffic from VMScaleSet1 to VMScaleSet2, Network Security Group (NSG) rules need to be created and assigned to the appropriate resources. An NSG rule is required to allow or deny traffic to or from a network interface (NIC), VM, or subnet.

Based on the requirement to only allow traffic from VMScaleSet1 to VMScaleSet2 on TCP port 443, the following can be determined:

Minimum number of custom NSG rules:

You need at least one rule to allow TCP port 443 and another to deny all other traffic that does not match any prior rules. However, because NSGs have default rules that deny all inbound traffic if no other rule allows it, you might only need to create a single rule to allow traffic on TCP port 443. But to be fully explicit and depending on the existing rules, you might also add a deny rule explicitly. So, the minimum number could be 1 (if relying on default rules) or 2 (if being explicit).

Minimum number of NSG assignments:

For NSG assignments, you would typically assign an NSG to the subnet or network interfaces of VMScaleSet2 to control the inbound traffic from VMScaleSet1. Since all VM instances in a scale set can share a single NSG, you only need to make one assignment of the NSG to cover all instances of VMScaleSet2. Therefore, the minimum number of NSG assignments is 1.

So, for the given scenario:

The minimum number of custom NSG rules required: 1 (to allow TCP port 443, assuming default rules handle the deny)

The minimum number of NSG assignments required: 1 (assign the NSG to the subnet or NICs of VMScaleSet2)

These selections are made with the assumption that the goal is to enforce the minimum necessary configuration changes while still satisfying the requirements.

HOTSPOT

You need to implement name resolution for the cloud.liwareinc.com. The solution must meet the networking requirements.

What should you do? To answer, select the appropriate options in the answer area. NOTE: Each correct selection is worth one point.

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Correct Answer:

Explanation:

Reference:

https://docs.microsoft.com/en-us/azure/dns/private-dns-autoregistration

https://docs.microsoft.com/en-us/azure/virtual-network/virtual-networks-name-resolution-for-vms-and-role-instances

You need to configure the default route on Vnet2 and Vnet3. The solution must meet the virtual networking requirements.

What should you use to configure the default route?

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