Monday 31 July 2017

Server Architecture Interview Questions and Answer

Server Architecture Interview Questions and Answer

Question: What is VPC?
Full form of VPC is Virtual Private Cloud.
It is virtual network dedicated to AWS account.It is logically isolated to the other virtual network in the AWS cloud.

Question: Can a VPC of any size be created?
Yes, After selecting an option, you can modify the size and IP address range of the VPC and its subnets.
You can modify the VPC to add more subnets or add/remove gateways at any time after the VPC has been created.
Question: How do AWS VPC work?
It is logically isolated from other virtual networks. You can launch your AWS resources, such as Amazon EC2 instances, into your VPC.
You can configure your VPC and select its IP address range, create subnets, and configure route tables, network gateways, and security settings.

Question: What is route table in AWS?
A route table contains a set of rules, that are used to determine where network traffic is directed.
Each subnet in your VPC must be associated with a route table, the route table controls the routing for the subnet.

Question: What is an Internet gateway AWS?
An Internet gateway is a horizontally scaled, redundant, and highly available VPC component that allows communication between instances in your VPC and the Internet.

Question: What is an Amazon VPC?
Amazon VPC lets you provision a logically isolated section of the Amazon Web Services (AWS) cloud where you can launch AWS resources in a virtual network that you define.

Following are components of VPC
  1. A Virtual Private Cloud
  2. Subnet
  3. Internet Gateway
  4. NAT Gateway
  5. Hardware VPN Connection
  6. Virtual Private Gateway
  7. Customer Gateway
  8. Router

Question: What is an Elastic IP address?
An Elastic IP address is a static IPv4 address designed for dynamic cloud computing. With an Elastic IP address, you can mask the failure of an instance or software by rapidly remapping the address to another instance in your account.
Question: What is AWS VPN?
You can connect your VPC to remote networks by using a VPN connection.

Question: What is Route 53?
Amazon Route 53 (Route 53) is a scalable and highly available Domain Name System (DNS).

Question: What is a static route?
Static routing is a form of routing that occurs when a router uses a manually-configured routing entry, rather than information from a dynamic routing traffic.

Question: What do you mean by dynamic routing?
Dynamic routing is a networking technique that provides optimal data routing. dynamic routing enables routers to select paths according to real-time logical network layout changes.

Question: What is meant by API gateway?
The API Gateway will often handle a request by invoking multiple microservices and aggregating the results.
It can translate between web HTTP and WebSocket and web?unfriendly protocols that are used internally.

Question: What is an API management?
It is process of publishing, documenting and overseeing application programming interfaces (APIs) in a secure, scalable environment.

Question: What is Amazon MWS?
Full form of MWS is Amazon Marketplace Web Service. It is an integrated web service API that helps Amazon sellers to programmatically exchange data on listings, orders, payments, reports, and more. Data integration with Amazon enables high levels of selling automation, which can help sellers grow their business.

Question: What is cloud computing?
cloud computing is the delivery of computing services—servers, storage, databases, networking, software, analytics and more—over the Internet.

Question: what is load balancer?
A load balancer is a device that acts as a reverse proxy and distributes network or application traffic across a number of. servers.
Load balancers are used to increase capacity (concurrent users) and reliability of applications.

Question: What is load balancing on a router?
Network load balancing is the ability to balance traffic across two WAN links without using complex routing protocols like BGP.

Question: How do load balancing servers work?
A load balancer acts as the "traffic cop" sitting in front of your servers and routing client requests across all servers capable of fulfilling those requests in a manner that maximizes speed and capacity utilization and ensures that no one server is overworked.

Question: What is Lambda?
AWS Lambda lets you run code without managing servers, AWS states on the Lambda product page.
You can think of Lambda as an event-driven computing platform;
Lambda runs when triggered by an event and executes code that's been loaded into the system.