PCF interview questions for experienced/PCF Interview Questions and Answers for Freshers & Experienced

What are some security measures provided by a cloud?

Security in the cloud is the major concerned for the organization as data should be stored in encrypted form.

What Are The Security Laws Which Take Care Of The Data In The Cloud?

The security laws which are implements to secure data in the cloud are as follows:
Input validation: controls the input data which is being to any system.
Processing: control that the data is being processed correctly and completely in an application.
File: control the data being manipulated in any type of file.
Output reconciliation: control the data that has to be reconciled from input to output.
Backup and recovery: control the security breaches logs and the problems which has occurred while creating the back.

What resources are provided by infrastructure as a service?

Infrastructure as a Service provides physical and virtual resources that are used to build a cloud. Infrastructure deals with the complexities of maintaining and deploying the services provided by this layer. The infrastructure here is the servers, storage, and other hardware systems.

What is SSH Daemon?

The SSH daemon is a lightweight implementation that is built around the Go SSH library. It supports command execution, interactive shells, local port forwarding, and secure copy. The daemon is self-contained and has no dependencies on the container root file system.

What are the characteristics on which a Cloud Computing Model should be selected for implementing and managing the workload?

Scalability is a characteristic of cloud computing through which increasing workload can be handled by increasing in proportion the amount of resource capacity. It allows the architecture to provide on-demand resources if the requirement is being raised by the traffic. Whereas, elasticity is being one of the characteristic provide the concept of commissioning and decommissioning of a large amount of resource capacity dynamically. It is measured by the speed by which the resources are coming on demand and the usage of the resources.

What is the use of API in cloud services?

API stands for Application programming interface is very useful in cloud platforms as it allows easy implementation of it on the system. It removes the need to write full-fledged programs. It provides the instructions to make the communication between one or more applications. It also allows easy to create an application with ease and link the cloud services with other systems.

What do you understand by CaaS?

CaaS is a terminology given in the telecom industry as Communication as a Service. The Voice-over-Ip (VoIP) follows the same delivery model. CaaS can offer enterprise user features such as desktop call control, presence, unified messaging, and desktop faxing. In addition to the enterprise features, CaaS also has a set of services for contact center automation that includes IVR, ACD, call recording, multimedia routing (e-mail and text chat), and screen pop integration.

How can a company benefit from cloud computing?

There are many advantages of cloud computing for any organization below are some of the benefits of cloud computing
Lower IT infrastructure and computer costs for users
More secure data backup
Data storage (Relational, No-SQL, Block Storage)
Increased productivity
Sandboxing and virtualization capabilities
Increased productivity
Cost-Effectiveness
Better for growth and scalability
Take advantage of powerful server capabilities without hardware investment.

Is Cloud computing an application?

The Cloud Computing is not an application but it is a methodology that deploys the application in a custom fashion on a server. It can be also learned as an advance model of client-server architecture that is highly flexible, scalable and configurable. This architecture leverages high performance out of machines with quite an ease of management.

Describe Cloud Computing As Concisely And Simply As Possible In Layman Language?

The purest form of cloud computing is pay-as-you-go Info Tech, online and on-demand as per needed. The Info Technology capabilities provided as a service to businesses includes single software applications and the software suites.

Explain The Importance Of Cloud Computing In It?

cloud computing addresses the explosive growth of internet-connected devices, and complements the increasing presence of technology in today’s world. Cloud computing provides superior user experience, is massively scalable, and is characterized by the internet-driven economics.

Comment On Cloud Computing Revolution?

It’s essential to understand that the cloud computing revolution is not just about doing old things in new ways, also it is not just more cheap and green but also more collaborative intelligent and better available. The opportunity for Information technology department is to achieve new things and to make new things possible by cloud computing.

Mention About The Top Cloud Applications Now A Days?

Top cloud computing applications include google docs which are very fast and secure. There is also a mobile version of google docs so you can access your data from a smartphone. Pixlr and Phoenix, gay cut also are the applications used for cloud computing.

How is Cloud Foundry Certification different from what other organizations offer in terms of certifying computer technology skills?

Both our Training and Certification are specifically focused on developers building applications on top of the Cloud Foundry platform.

How will my organization benefit from providing Certification to its employees?

Our suite of training and certification products can help your organization transform, quickly bringing your developer population up-to-speed with the skill sets required to tackle your digital transformation needs. Additionally, Certification is an excellent way to verify that candidates you are considering hiring have the practical experience necessary to be productive working with Cloud Foundry.

Is there any difference between scalability and elasticity in Cloud Foundry?

a Scalability is an approach in Cloud Foundry with the help of which blooming workload can be handled by growing in magnitude the supply of resource capacity. On the other side, elasticity reflects the notion of assigning and eliminating resource capacity on a large amount. Both Scalability and Elasticity are required to derive the best results. Also, both these can be considered as the characteristics of Cloud Foundry.

How the Cloud Foundry apps run anywhere?

There are two virtual machines that cloud foundry designates and they are VM for the infrastructure of the platform and the second is VM for hosting apps for the outside world. There is an auction algorithm through which the Diego system simply assign hosted app load to all the virtual machines of the host. It keeps it running and simply ensures balance with the help of demand surges and outages.

What is the difference between IaaS vs PaaS?

PaaS, or solution stack, offers a more comprehensive approach to the cost-effective application deployment need of today’s developers. This service provides the necessary hardware architecture and software framework needed to put an application into service, without having to own, manage and upkeep all the required resources.
IaaS, in comparison to the PaaS, provides equipment for operations, networking, data storage and hardware with the use of the internet, so that the subscriber is no longer confronted with location and purchase cost.

Is There Any Difference In Cloud Computing And Computing For Mobiles?

Mobile cloud computing uses the same concept but it just adds a device of mobile. Cloud computing comes into action when a task or data get kept on the internet rather than individual devices. It provides users on-demand access to the data which they have to retrieve. Applications run on the remote server and then given to the user to be able to, store and manage it from the mobile platform.

How To Secure Your Data For Transport In Cloud?

Cloud computing provides very good and easy to use the feature to an organization, but at the same time, it brings lots of question that how secure is the data, which has to be transported from one place to another in the cloud. So, to make sure it remains secure when it moves from point A to point B in the cloud, check that there is no data leak with the encryption key implemented with the data you sending.

Who offers the Certification and administers the exam? Do they offer other certifications?

The Cloud Foundry Foundation, in partnership with the Linux Foundation, offers the Certification exam. The Linux Foundation offers three additional certifications: Linux Foundation Certified System Administrator; Linux Foundation Certified Engineer; and Certified OpenStack Administrator.

Is there training to prepare for the Certification exam?

Yes! Our Cloud Foundry for Developers eLearning course (or equivalent training from one of our training partners) provides developers with the knowledge necessary to be productive on the Cloud Foundry platform. Applying that knowledge, as well as spending time working with Cloud Foundry in a real-world setting, will prepare developers for the Cloud Foundry Certified Developer exam.

How do you use Docker in Cloud Foundry?

By default, apps deployed with the cf push command run in standard Cloud Foundry Linux containers. With Docker support enabled, Cloud Foundry can also deploy and manage apps running in Docker containers.

To deploy apps to Docker, developers run cf push with the –docker-image option and the location of a Docker image to create the containers from.

To enable Docker support on a CF deployment, an operator must do the following:

Enable the diego_docker feature flag.

Configure access to any Docker registries that developers want to use images from.

How will I, as a developer, benefit from Certification?

Organizations are looking for qualified developers that can be highly productive working on top of the Cloud Foundry platform. Our training program prepares you to work with Cloud Foundry and to understand how cloud-native applications are designed and built. Further, certification demonstrates to the many employers looking for qualified developers that you have passed a performance-based knowledge exam and you have the skills they’re looking for, both in terms of conceptual understanding and practical hands-on experience.

How significant is the platform as a service?

PAAS (Platform as a service) is an extremely significant layer in cloud Foundry. It provides the application platform for the developers and is liable for offering the entire virtualization of the infrastructure layer. This makes the platform work as a single server and maximum scalability can be assured without compromising with the app quality.

What do you know about hosting static files in Cloud Foundry?

After creating the account and setting up the command-line interface tool, applications can simply deploy. Generally, static files need a Web server such as Nginx or Apache. The platform undoubtedly takes care of configuration after this and applications can be hosted.

How it is possible for users to gain from utility computing?

Well, the fact is Utility computing enables the users to pay as per the usage and nothing else. An organization can consider it as a plug-in that generally manages and decides the type of service which needs to be displayed from the cloud. Thus users can gain from it simply.

As an (IaaS), infrastructure as a service, what resources are provided by Cloud Foundry?

There are physical as well as virtual resources that are used to build a cloud. It generally deals with the problems associated with maintaining and expanding of the services.

Tell the different models available for the deployment of Cloud Foundry

Cloud Foundry can simply be deployed through any of the following models depending upon exact need and the type of results:

1. Public cloud
2. Private Cloud
3. Hybrid Cloud
4. Community cloud

What are the different layers that define the architecture of Cloud Foundry?

Node Controller, Walrus, cloud Controller, Storage Controller, and Cluster Controller are the layers of cloud Foundry architecture. These layers are best in making the cloud environment reliable and developers can perform their tasks simply and quickly. Because of these layers, Cloud Foundry is the best technology.

How does cloud computing provides on-demand functionality?

Cloud computing is a metaphor used for the internet. It provides on-demand access to virtualized IT resources that can be shared by others or subscribed by you. It provides an easy way to provide configurable resources by taking it from a shared pool. The pool consists of networks, servers, storage, applications, and services.

How do you add a Buildpack?

To add a buildpack, run the cf create-buildpack BUILDPACK PATH POSITION [–enable|–disable] command.

What is Zipkin Tracing?

Zipkin is a tracing system that enables app developers to troubleshoot failures or latency issues. Zipkin provides the ability to trace requests and responses across distributed systems.

What are the components of Container-to-Container Networking?

The Container-to-Container Networking BOSH release includes the following core components:

Cloud Foundry Command Line Interface (CF CLI) plugin

Policy Server

Garden External Networker

The Container-to-Container Networking BOSH release includes the following swappable components:

Silk CNI plugin

VXLAN Policy Agent

What is Container-to-Container Networking?

The Container-to-Container Networking feature enables app instances to communicate with each other directly. Container-to-Container Networking integrates with Garden-runC in a Diego deployment. The Container-to-Container Networking BOSH release includes several core components, as well as swappable components.

How User Will Gain From Utility Computing?

Utility computing allows the user to pay per use means whatever they are using only for that they have to pay. It is a plugin that needs to be managed by the organizations on deciding what type of services has to be deployed from the cloud. Utility computing allows the user to think and implement the services according to them. Most organizations go for a hybrid strategy that combines internally delivered services that are hosted or outsourced services.

What are some open source cloud computing platform databases?

Cloud computing platform has various databases that are in support. The open source databases that are developed to support it is as follows:

MongoDB: is an open source database system which is schema-free and document-oriented database. It is written in C++ and provides tables and high storage space.

CouchDB: is an open source database system based on Apache server and used to store the data efficiently.

LucidDB: is the database made in Java/C++ for data warehousing. It provides features and functionalities to maintain a data warehouse.

Explain about Software Vulnerability Management in CF?

Cloud Foundry manages software vulnerability using releases and BOSH stemcells. New Cloud Foundry releases are created with updates to address code issues, while new stemcells are created with patches for the latest security fixes to address any underlying operating system issues.

What are Isolation Segments?

Isolation segments provide dedicated pools of resources to which apps can be deployed to isolate workloads. Using isolation segments separates app resources as completely as if they were in different CF deployments but avoids redundant management components and unneeded network complexity.

Is it cost-effective to implement a private cloud rather than a public cloud and why?

It depends on the type of business that demands a cloud setup. Suppose if the subscription on a public cloud for an application that is to be deployed on OS images is proving to be more costly then to buy some new datacenters and maintain them. Then obviously the private cloud has to be set up instead of a public cloud. This public clouds follow utility billing methodology as an electricity bill for example.

Is it cost-effective to implement a private cloud rather than a public cloud and why?

One must pay attention to the leak in the encryption key enforce with the data to be sent. This is the most common reason of data leakage.

What do you know about using services with Cloud Foundry

Generally, the apps are dependent on the metered or free services like API or databases. To assimilate these into apps, developers can write a service broker which is basically an API that broadcasts to Cloud Controller the provisioning of service, service offering and empowers apps to make calls.

What Is The Use Of Eucalyptus In Cloud Computing Environment?

Eucalyptus stands for Elastic Utility Computing Architecture for Linking Your Programs to Useful Systems and provides an open source software infrastructure to implement clusters in the cloud computing platform. It is used to build private, public and hybrid clouds. It can also produce your own datacenter into a private cloud and allow you to extend the functionality to many other organizations. Eucalyptus provides APIs to be used with the web services to cope up with the demand of resources used in the private clouds.

What Do You Understand From Vpn?

VPN stands for the virtual private network; it is a private cloud which manages the security of the data during the transport in the cloud environment. VPN allows an organization to make a public network as a private network and use it to transfer files and other resources on a network.

What are the security features available in Cloud Foundry?

Cloud Foundry implements the following measures to mitigate against security threats:

Minimizes network surface area

Isolates customer applications and data in containers

Encrypts connections

Uses role-based access controls, applying and enforcing roles and permissions to ensure that users can only view and affect the spaces for which they have been granted access

Ensures security of application bits in a multi-tenant environment

Prevents possible denial of service attacks through resource starvation

What is role-based access control (RBAC) system in CF?

CF uses a role-based access control (RBAC) system to grant Cloud Foundry users permissions appropriate to their role within an org or a space.

What is SSH Proxy Authentication?

The SSH proxy hosts the user-accessible SSH endpoint and is responsible for authentication, policy enforcement, and access controls in the context of Cloud Foundry. After a user has successfully authenticated with the proxy, the proxy will attempt to locate the target container and create an SSH session to a daemon running inside the container. After both sessions have been established, the proxy will manage the communication between the user’s SSH client and the container’s SSH Daemon.

What are the SSH Components in CF?

The Cloud Foundry SSH includes the following central components, they are:

An implementation of an SSH proxy server.

A lightweight SSH daemon.

How Diego Balances App Processes?

Diego balances app processes over the virtual machines (VMs) in a Cloud Foundry (CF) installation using the Diego Auction. When new processes need to be allocated to VMs, the Diego Auction determines which ones should run on which machines. The auction algorithm balances the load on VMs and optimizes app availability and resilience.

What are the components of Diego architecture?

Diego architecture consists of below components:

1. Diego Cell Components
2. Diego Brain Components
3. Database VMs
4. Access VMs
5. Cloud Controller Bridge Components
6. Consul
7. App Lifecycle Binaries

What is Metrics Collector?

The metrics collector gathers metrics and statistics from the components. Operators can use this information to monitor a Cloud Foundry deployment.

Is Heroku based on Cloud Foundry?

To manage application settings and scaling, each use their own ruby gems (vmc and heroku, respectively). Both Cloud Foundry and Heroku are controlled mainly from the command line. Heroku has integrated git into its deployment process, though Cloud Foundry is does not.

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