Showing posts with label gateway. Show all posts
Showing posts with label gateway. Show all posts

June 03, 2022

Top 20 AWS Transit Gateway Interview Questions and Answers

 

AWS Transit Gateway is a central hub that links your Amazon Virtual Private Clouds (VPCs) and on-premises networks. This streamlines your network and eliminates complicated peering arrangements. It functions as a cloud router, establishing new connections only once.


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Ques. 1): How do I decide which Amazon Virtual Private Clouds (VPCs) are allowed to speak with one another?

Answer:

Create numerous route tables in an AWS Transit Gateway and attach Amazon VPCs and VPNs to them to partition your network. This allows you to construct isolated networks within an AWS Transit Gateway, similar to how VRFs are used in traditional networks. There will be a default route table for the AWS Transit Gateway. Multiple route tables can be used if desired.


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Ques. 2): What is the definition of a global network?

Answer:

In the AWS Transit Gateway Network Manager service, a 'Global Network' object represents your private global network in AWS. Your AWS Transit Gateway hubs, attachments, AWS partner SD-WAN network virtual appliances, and on-premises devices, sites, linkages, and connections are all included.


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Ques. 3): In the same multicast domain, can I have both IGMP and static members?

Answer:

Yes, in the same multicast domain, you may have both IGMP and static members. By delivering IGMPv2 messages, IGMP-capable participants can dynamically join or exit a multicast group. Using the terminal, CLI, or SDK, you may add or delete static members from a multicast group.


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Ques. 4): How does AWS Transit Gateway's routing work?

Answer:

Between connected Amazon VPCs and VPNs, AWS Transit Gateway provides both dynamic and static routing. The default route table is associated with Amazon VPCs, VPNs, Direct Connect gateways, Transit Gateway Connect, and peered Transit Gateways by default. You may associate Amazon VPCs, Direct Connect gateways, VPNs, Transit Gateway Connect, and peered Transit Gateways with extra route tables.

Depending on the packet's destination IP address, the routes determine the next hop. Routes can be configured to point to an Amazon VPC, a VPN connection, a Direct Connect gateway, a Transit Gateway Connect, or a peered Transit Gateway.


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Ques. 5): What is AWS Transit Gateway Network Manager, and how does it work?

Answer:

The Network Manager function of AWS Transit Gateway is a feature of AWS Transit Gateway. It centralises networking resource administration and monitoring, as well as connectivity to remote branch sites.

 

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Ques. 6): Is it possible to link Amazon VPCs with the same CIDRs?

Answer:

Routing across Amazon VPCs with identical CIDRs is not supported by AWS Transit Gateway. If you create a new Amazon VPC with a CIDR that is the same as an existing Amazon VPC, AWS Transit Gateway will not add the new Amazon VPC route to the AWS Transit Gateway route database.

 

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Ques. 7): For the GRE tunnel and BGP addresses, can I use various address families?

Answer:

Yes, the GRE tunnel and BGP addresses can be in the same or distinct address families. You can, for example, set the GRE tunnel to use IPv4 addresses and the BGP addresses to use IPv6 addresses, and vice versa.


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Ques. 8): What is AWS Transit Gateway Connect, and how does it work?

Answer:

A feature of AWS Transit Gateway is AWS Transit Gateway Connect. The native integration of SD-WAN (Software-Defined Wide Area Network) network virtual appliances into AWS Transit Gateway facilitates branch connectivity. Connect attachment is a new logical attachment type provided by AWS Transit Gateway Connect that uses Amazon VPC or AWS Direct Connect attachments as the underlying network transport. Over the Connect attachment, it supports common protocols including Generic Routing Encapsulation (GRE) and Border Gateway Protocol (BGP).


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Ques. 9): Is it possible to share a multicast Transit Gateway?

Answer:

Yes, you may share a transit gateway multicast domain for VPC subnet associations between accounts or throughout your company in AWS Organizations using AWS Resource Access Manager (RAM).


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Ques. 10): Can I link my AWS Transit Gateway to another account's Direct Connect gateway?

Answer:

Yes, you can link your AWS Transit Gateway to a separate AWS account's AWS Direct Connect gateway. An affiliation to a Direct Connect gateway can only be created by the owner of the AWS Transit Gateway. You can't link your AWS Transit Gateway to your Direct Connect gateway with Resource Access Manager.


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Ques. 11): Is it possible to link a route table to a Connect attachment?

Answer:

Yes, you may associate a route table with the Connect attachment, just like you can with any other Transit Gateway attachment. This route table might be the same as or different from the route table associated with the VPC or AWS Direct Connect (underlying transport mechanism) attachment.


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12) Which Amazon VPC functionalities aren't available in the first release?

Answer:

At this time, Amazon VPC does not enable Security Group Referencing. Security groups in other spokes linked to the same AWS Transit Gateway cannot be referenced by spoke Amazon VPCs.


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Ques. 13): What is the process for propagating routes into the AWS Transit Gateway?

Answer:

In the AWS Transit Gateway, routes are propagated in two ways:

Propagation of routes to/from on-premises networks: Routes will propagate between the AWS Transit Gateway and your on-premises router utilising Border Gateway Protocol when you connect VPN or Direct Connect Gateway (BGP).

Routes to/from Amazon VPCs: When you attach or resize an Amazon VPC to an AWS Transit Gateway, the Amazon VPC Classless Inter-Domain Routing (CIDR) will propagate into the AWS Transit Gateway route table utilising internal APIs (not BGP). CIDR is a technique of allocating IP addresses and IP routing that helps to reduce the expansion of routing tables on routers throughout the Internet and the quick expiration of IPv4 addresses. The Amazon VPC's route table will not receive routes from the AWS Transit Gateway route table. To transmit traffic to the AWS Transit Gateway, the VPC owner must construct a static route.

Route propagation is not supported via peering links between Transit Gateways. To send traffic on peering attachments, you must construct static routes in the Transit gateway route tables.


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Ques. 14): AWS Transit Gateway complies with which compliance programmes?

Answer:

AWS Transit Gateway inherits Amazon VPC compliance and fulfils PCI DSS Level 1, ISO 9001, ISO 27001, ISO 27017, ISO 27018, SOC 1, SOC 2, SOC 3, FedRAMP Moderate, FedRAMP High, and HIPAA compliance requirements.


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Ques. 15): What is the procedure for installing AWS Transit Gateway Network Manager?

Answer:

To set up and operate Transit Gateway Network Manager, follow the steps below:

Create a new 'global network' object that is initially empty.

AWS Transit Gateways can be registered from any AWS Region.

Adding on-premises and cloud resources: Enter details about your on-premises and cloud devices, sites, links, and connections. Connect peers and the Site-to-Site VPN connections they're connected to.

Network Manager's visualisations, events, and analytics let you keep track of your worldwide network.

 

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Ques. 16): When I register an AWS Transit Gateway, what resources are immediately added to the global network?

Answer:

All attachments are automatically added for registered AWS Transit Gateways. VPCs, VPNs, Direct Connect gateways, AWS Transit Gateway Connect, and AWS Transit Gateway peering are examples of attachments.


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Ques. 17): To route multicast traffic, which attachment kinds may I use?

Answer:

You may use a Transit Gateway to transport multicast traffic inside and between VPC attachments. AWS Direct Connect, AWS Site-to-Site VPN, and peering attachments do not enable multicast routing.

 

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Ques. 18): Is AWS Transit Gateway Connect compatible with IPv6?

Answer:

Yes, IPv6 is supported by AWS Transit Gateway Connect. IPv6 addresses can be configured for both the GRE tunnel and the Border Gateway Protocol (BGP).


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Ques. 19): AWS Transit Gateway Network Manager is supported by which AWS partners?

Answer:

A number of notable SD-WAN partners support AWS Transit Gateway Network Manager. For further information, please see the Partners page. Their SD-WAN solutions' integration of Network Manager allows you to automate branch-cloud connectivity and delivers end-to-end network monitoring from a single dashboard.

 

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Ques. 20): What appliances are compatible with AWS Transit Gateway Connect?

Answer:

AWS Transit Gateway Connect will operate with any third-party network appliances that support standard protocols like GRE and BGP.


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