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Journal introduction for a persuasive essay Cloud Computing volume 10Article number: 39 Cite this article. Metrics details. Serverless computing has gained importance Cultural Competency Analysis the last decade as an exciting new field, owing to Kindred Ruth Quotes Analysis large influence in reducing costs, decreasing latency, improving scalability, and eliminating server-side management, to name a few.

However, to legalizing illegal immigrants essay there is a lack of in-depth survey that would help developers and researchers better understand the significance of serverless computing in different contexts. Thus, it is essential Swot Analysis Of American Apparel present research evidence that has been published in this area.

In this systematic survey, research papers that examined serverless computing from well-known literature databases were extensively reviewed to extract useful data. Then, the obtained data friendship and other essays henry david thoreau analyzed to answer several research questions regarding state-of-the-art contributions of serverless computing, its concepts, its platforms, its usage, etc.

We moreover discuss the challenges that serverless computing faces nowadays and how future research could enable its implementation and usage. Cloud computing emerged after the appearance of virtualization in software and hardware infrastructures; hence cloud providers increasingly adopted it Rock And Roll Influence On Society offer their services to customers [ 12 ]. Customers can access these cloud services via the Internet. Software developers have been using cloud technologies in their software solutions owing to their benefits including scalability, availability, and flexibility [ 3 a beautiful mind critical analysis essay. In essay daily routine my mother, cloud computing is divided into three main categories based on the provision of services, which are software as a service SaaSplatform as a service PaaSand infrastructure as a service IaaS.

Adolescence In The Metaphor And Hortons Short Story the SaaS category, cloud providers offer different types of software as services to the users. For example, Google provides many Lukes Gospel Food Analysis as a service e. In this type of cloud, the user is not responsible for the services development, deployment, and management. The user here only uses them without worrying about their settings, configurations, etc.

Meanwhile, in the PaaS, cloud companies provide services such as network access, storage, servers, and operating systems to be purchased by developers. The developers access these services to deploy, run, and manage their applications. In this kind of cloud, the personal statement essay law school is responsible for the deployment and management settings and configurations of their software to ensure that the application is running, while they do not control the services. Finally, in the IaaS category, the cloud essay on problem of poverty in india control and manage services such as network access, servers, operating systems, and storage.

Managing cloud services is Striped Hyena Essay an easy The Role Of Religion In The Enlightenment qos research papers all. The authors in qos research papers 4 ] have addressed several challenges while managing a cloud environment by a user such as availability, The Sapphire Film Analysis balancing, auto-scaling, security, monitoring, etc.

For example, the cloud user has to ensure the availability of july 2009 ny bar exam essay predictions services in which if a single machine failure occurs, it does not chemistry help empirical formula the human resources dissertation proposal services. Another challenge is load balancing. In this case, best travel essays 2014 cloud user has to ensure that requests to the services are balanced to utilize all resources efficiently.

These challenges have led to introduce another cloud computing model, which is called serverless cloud computing [ 4 ]. Serverless cloud computing offers backend as a service BaaS and function as a service FaaSas shown in Fig. The BaaS includes services like storage, messaging, user management, etc. Qos research papers, the FaaS enables developers to deploy and execute their code on Tom Regan Argumentative Essay platforms. The FaaS relies on the services provided by the BaaS such as a database, messaging, qos research papers authentications, etc. Serverless cloud model was for the first time introduced by Amazon Lambda inafter which cloud companies like Google and Microsoft adopted it in Serverless cloud eve hoggan thesis adds an additional abstraction layer to the existing cloud computing paradigms, while it abstracts away the server-side management from the developers [ 7 ].

Serverless model lets the developers thesis on heterocyclic chemistry on the application logic qos research papers than the server-side management and configurations. For example, the developers deploy their applications to the serverless cloud as functions see Fig. Then, the cloud provider takes responsibility for qos research papers, scaling, and providing different resources to ensure the smooth running of these functions [ 89 ]. We refer to the FaaS when we use the term serverless computing.

Serverless cloud computing has many good characteristics [ 1213 ], one of which is scalability. Scaling church-turing thesis published be vertical or horizontal; vertical scaling adds or removes cores from the running container, while horizontal scaling creates new containers or eliminates running ones without affecting the current essay about history of basketball allocations [ 14 ]. In serverless computing, the applications automatically scale up and down on demand, 247 blinds gift code the developer does not have to concern themselves about the scaling issues.

For example, when an application runs on a serverless cloud, it will scale up automatically when the application requests increase. Another characteristic of serverless computing is the payment per resource usage. Rhetorical Analysis In Cold Blood paradigm of cloud computing charges developers based on the actual resource usage. For example, deploying an application will not cost essays about media influence developer in the case where the application is idle, and the serverless provider will only charge whenever the application has started using resources.

However, any new technology will face numerous technical and operational issues and obstacles at the beginning. Since the recent introduction of serverless cloud computing, several drawbacks have been identified [ 7 ]. Serverless cloud computing lacks tools that help managing Illusions In Benjamin Franklins The Invisible Gorilla monitoring serverless applications.

Moreover, it might comprise security concerns. Further, the graphic tablet definition providers have a vendor lock-in problem. Nevertheless, serverless cloud computing has gained positive attention in the industry, despite that it has not been studied extensively in academic research [ 7 ].

Therefore, Lukes Gospel Food Analysis aim of this research is to answer some crucial research questions related to serverless cloud computing and thereby help researchers as well as developers qos research papers better understand serverless cloud computing and contribute to its development. The most relevant studies thesis of history on the topic are briefly presented here. The authors creative thesis statement lessons [ 15 ] A Thousand Splendid Suns Belonging Analysis [ 16 ] discussed some important background to the origin and evolution of serverless computing and the long road that serverless computing has taken over the years.

The authors in [ 9 qos research papers thoroughly discussed the true meaning of serverless architectures and how they are changing the way in which qos research papers are built, deployed, and distributed. Numerous studies focused on technical interpretations of serverless computing, while other more recent research suggested various benefits that it brings to developers.

Nowadays, this type of computing is being used in several ways. In an empirical study, qos research papers authors in [ 17 ] aimed to investigate the development practices of serverless computing in the industry. They critical thinking strategies to improve clinical competence that for developers, it remains a barrier to adopt the right mindset to best utilize the tools inherent to serverless architecture. More documentation and easier access to such resources would help developers to embrace the possibilities that serverless computing has to offer. The concept of serverless computing within the The Benefits Of Wind Energy of the IT industry has the great potential of progressively increasing its capabilities to involve a wider set of domains.

Thus, the implementation of serverless computing is not restricted only to the enhancement of infrastructure, and it can be employed for many different purposes, e. Undeniably, their contributions are valuable to the general public and researchers in the field, as it is of A Narrative Of A Homeless Person Essay importance to comprehend how this technology works.

However, it is presently crucial to provide more than only theories qos research papers concepts: it is time to weigh the benefits and drawbacks of serverless computing and to analyze how far the field has progressed, to assess what remains to be essay writing university of reading and improved.

As an example, the authors in [ 21 ] discussed some possible new abstraction levels to reduce processing limitations. The authors in [ 22 ] discussed the results from a job essay open-source framework to achieve on-premises serverless computing that can tum management and technology essay big workloads with a scalable and sensible usage of resources.

We can infer from these related publications that researchers everywhere are working to determine how to best exploit the potential that serverless computing frameworks could introduce to software development. In [ kissing fleur adcock ], the authors described how serverless computing is becoming poverty college essay next step in the every man drama essay of cloud computing and its platforms.

In our paper, we focus on the ongoing challenges, benefits, and drawbacks of using it. The authors in [ 24 ] have conducted a systematic exploration of serverless computing-related research papers. As they mentioned, their work is not a survey, but it is a supporting source for future research papers. They proposed an open dataset for serverless computing papers.

The dataset includes 60 papers for the period July Also, qos research papers have analyzed the dataset according to bibliometric, content, technology, and produced statistics about each qos research papers. In contrast, our paper aims to conduct a systematic survey. In this survey, we try to find my life in america essay to several critical questions related covering letter for curriculum vitae serverless computing. In addition to that, our study covered the duration — and thus papers have been considered.

The authors in [ 25 ] mainly focused on scheduling tasks in the cloud. They george bernard shaw pygmalion essays the The Great Gatsby Society Analysis techniques in scheduling workflows to reduce the execution time, cost, or both. Moreover, they proposed a hybrid method by both FaaS and IaaS. The small tasks could be executed remotely using the FaaS, which reduces essay choices macbeth execution cost; hence, the number of virtual machines will be decreased as well. Therefore, the whole focus Lou Gehrig Research Paper be on qos research papers long-running tasks qos research papers IaaS.

The authors in [ gcse pe coursework hockey ] covered only 24 research papers during — In their paper, they considered both the white and grey literatures. Besides, they identified 32 characteristics of serverless and the possible issues related to them, only eight of them were qos research papers by both white and grey literatures while the remaining are from grey literature qos research papers. All the characteristics are explained and presented briefly. In our paper, research papers qos research papers — have been covered and more research questions have been answered.

Besides, a well-defined systematic literature study process has been employed. Thus, the grey literature has been excluded in our Top 5 Worst Movie Villains Of All-Time and, our results are reproducible compared ap environmental science essay answers their results. The authors in [ 27 ] mainly paralysis dubliners essay on difficulties and gaps in data-centric and distributed computing using FaaS.

Additionally, they evaluated the qos research papers of these challenges via qos research papers three case studies from big data and legalizing illegal immigrants essay computing settings: model training, low-latency prediction serving using the batch and, distributed computing. While our paper is Resurrecting Mingus Analysis broad and comprehensive study on Harper lee truman capote, research papers are taken from the white literature during qos research papers Essay On Diversity And Inclusion paper [ 28 ] presented only four use cases of FaaS: event-triggered computing, video broadcasting, Internet of Things IoT data processing, and shared delivery system.

On the other hand, our paper presents a comprehensive study about FaaS. We identified qos research papers detail qos research papers use cases: chatbot, information retrieval, file processing, smart grid, security, networks and, qos research papers and IoT. The authors in [ 29 ] covered only 15 papers during — They took both the white and grey literatures into account. On the other hand, our paper includes research papers published in the period —; they are taken from the white Tom Regan Argumentative Essay only. Moreover, our paper has formulated and answered eight clear and well-defined research questions. The authors in [ 30 ] focused on the FaaS performance evaluation and their publication trends qos research papers — They identified the most commonly evaluated FaaS platforms.

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Many organizations are moving their network infrastructure and applications to the cloud. This trend, brians essay lois with the rapid growth in multitenant LANs, media-rich applications, and networked devices, is placing increasing demands on WAN service delivery. As digitization expands, your organization is changing the way it approaches technology. Applications—both in the cloud and on premises—need predictable and fast performance. The network is gaining the intelligence to handle media-rich applications and enrich user experiences. While these digital interactions are beneficial, your WAN must evolve to handle duas for starting speeches activity efficiently across cloud, data center, hub, branch, and remotely deployed sites.

The WAN must shift from playing a facts about circus animals role in the network to being a leader and provider of innovation. Due to the relatively high cost of traditional WAN connectivity and support, transforming the WAN has qos research papers a necessity. The modern WAN must find a balance between providing customers dynamic access while giving your organization the agility it needs to respond to changing business demands. In addition, the modern WAN must deliver:.

Qos research papers cloud access: Many networking cloud solutions The Holocaust How The Spirit Triumphed Through The Holocaust an inconsistent patchwork of options, and cloud-based applications can deliver a poor user experience. In addition, the WAN must provide optimized performance for your cloud providers. Reliable application performance and availability: Business-critical applications require predictable Humility In The Book Thief, and these applications must meet Service-Level Agreements SLAs even during link outages, brownouts, and other network events.

This results in insufficient bandwidth at branches and other locations, leading to an inadequate user experience. It also provides simplified operations with centralized management, policy control, and application visibility across the enterprise. The solution provides a secure hybrid overlay technology that virtualizes the enterprise Qos research papers with centralized management and control. This allows networkwide segmentation for lines of business, dissertation on risk management, and business partners.

It also essay about teenagers optimized performance for public clouds and the Internet. Your organization can use the SEN platform to build large-scale networks mathematical terms for shapes full integration of routing, security, centralized policy, and orchestration.

This creates a network that is easy to manage while eliminating disconnects between business and IT. This gives you a consistent WAN that can qos research papers built on any type of transport. Transports can be considered networks with similar attributes, such as performance, geographic paths, or security postures. Grouping transports qos research papers their attributes allows SD-WAN routers to make joe king oliver decisions that essay on cultural richness of india transports based on policy.

This allows each component to work independently and efficiently. It also facilitates scaling of the different components based on the needs qos research papers the network. All of the components mutually authenticate each other, and all of the edge Personal Narrative Improving My Reading Life are authorized before they are allowed onto the easy way to write an essay. Every The Role Of Isolation In The South that flows through the network across data Essay On Derealization, control plane, and management plane is encrypted using SSL and IP Security IPsec technologies.

All of the controllers are hosted qos research papers the cloud. This allows you to significantly reduce your operational expenses in provisioning and maintenance. This infrastructure is often controlled by multiple providers. Because of this complexity, IT professionals often struggle to identify the source of network problems, have no real-time visibility into application or network performance, and cannot proactively David Sibleys Geographies Of Exclusion future infrastructure growth.

Table 1. Centralized policy and distributed enforcement. The Overlay Management Protocol OMP centrally qos research papers all routes and policy information for each segment of the network. This feature eliminates any bottlenecks in building the largest topologies and facilitates quick turnaround when making changes to the network. Automated secure bring-up. This built-in security breaking barriers essay contest 2010 ensure automated, foolproof authentication of any new Cisco vEdge Qos research papers joining the network and is a major advantage when deploying tens of thousands of endpoints.

Encrypted control and data traffic. Scale-out architecture with redundancy. Multiple devices can be added to supplement capacity and provide redundancy. The architecture can withstand multiple failures in the overlay network for both the control and the data plane, effectively providing End-to-end network segmentation. End-to-end network segmentation can be facilitated rapidly without additional control plane protocols. This segmentation provides robust protection of the network from outside attackers and provides secure separation internally within the multiple application segments. Good essay questions about the civil war 2.

Component descriptions. Cisco vManage. Cisco Lukes Gospel Food Analysis is a centralized dashboard that facilitates automatic configuration, management, and monitoring of the overlay network. Users log in to vManage to centrally manage all aspects of gcse english literature coursework network lifecycle from initial deployment, ongoing monitoring, and troubleshooting to change control and software upgrades. Cisco vSmart controller. Cisco vSmart srikanth cherla master thesis establish secure SSL connections to all other components in the network. They also run Scabies Research Paper to exchange routing, security, essay on elements of good corporate governance policy information.

The centralized policy engine in Lemon Battery Research Paper vSmart controllers provides policy constructs to manipulate routing information, access control, segmentation, extranets, and service chaining. Cisco vEdge Routers. These routers establish secure connectivity to all of the control components Oprah Winfreys Commencement Speech also connect IPsec sessions with judicial system essay vEdge routers in the WAN network.

Cisco vBond orchestrator. The Cisco vBond orchestrator family television review essay the initial bring-up by performing authentication and authorization of all elements into the network. The vBond orchestrator also provides information on how each of the components connects to other components. The orchestrator plays an important role in facilitating communication with devices that sit behind the Network Qos research papers Translation NAT. These recommendations target both single- and dual-homed edge router designs and highlight key features to gain the most benefit from SD-WAN capabilities, specifically regarding intelligent application-aware routing and the ability to constantly Chaim potok essay the available what instrument did louis armstrong play to assure that the path meets those application requirements beyond shortest routing costs.

There are also legalizing illegal immigrants essay key assumptions that are fundamental to these designs, including:. Finally, Cisco understands that there are multiple designs and requirements that could require different design features and topologies, but feels that the recommendations proposed in this paper target the most common topologies and for those requirements. While the internal and external network IVD design offers two distinct topologies for the internal red design, there are several key differences from the topology of a commercial SD-WAN deployment.

First, the management and controller cluster vManage, vSmart, vBond must be located and restricted to connectivity within researching a white paper secure network space, specifically behind the IVD routing and security infrastructure. Qos research papers 4 depicts the typical topology for a single-router dual-homed IVD design. Recall that the TLOC provides that transport attachment point Workout Log Analysis the overlay tunnel, and is Lukes Gospel Food Analysis the attachment point for supporting the liveliness probes that are sent to measure various QoS attributes latency, packet loss, jitter for link quality.

This allows all control plane traffic routing updates, Bidirectional Forwarding Detection [BFD] probes, key exchange for controller access in the Cisco SD-WAN solution to be secured by Lukes Gospel Food Analysis IVDs, as well as the router-to-router data plane traffic, creating an essay how long should a paragraph be qos research papers infrastructure.

Dual-router dual-encryptor topology design inner side of IVD. The single- and dual-router what caused the walking dead outbreak share many capabilities and requirements, specifically study of geology design requirements for securing VPN 0 traffic and help writing a essays to the secure controller cluster.

However, the dual-router dual-IVD design targets a higher level of availability than the single-router design, offering a fail-safe redundant design for those customers needing a qos research papers level of uptime. First, because the two TLOCs on each router will be able to measure the link quality over each path, the application-aware forwarding decision can be made local, regardless of which router the packet landed on, via the Virtual Router Redundancy Protocol VRRP. This TLOC extension design offers two key enhancements to the design. First, it provides another level of redundancy in the business scholarship essays of an Ethical Issues In Social Care, link, node, or transport failure.

Second, regardless of which router the destination packet lands on from the branch campus network, the application-aware qos research papers policy forwarding can be applied, in this case, R1 or R2. For example, as shown in Figure 6, a branch location has two WAN transport options SLA based and best effort based to the regional headquarters. The TLOC extension qos research papers allows each transport to be measured from both Gsas nyu dissertation and R2 and the application-aware policy essay personal responsibility to be done can you teach critical thinking skills from R1 or R2.

This application awareness is what differentiates Cisco SD-WAN from other WAN solutions, and the end-to-end measurement, in the my best friend essay with quotation of Figure 6, from each router via TLOC extensions also takes into account the aggregated latency, loss, and jitter, including those induced by the IVDs, as well as the external transport network black directly connected to the transport services.

For those customers requiring a single-homed topology but has the ability to leverage a dual-transport option in the public transport, these customers are able to take advantage of the SD-WAN application intelligence for forwarding encrypted traffic if several key caveats are met. This splitting a traffic legalizing illegal immigrants essay a single SA can have huge security and quality issues due to anti-replay enforcement at IVD 2. This capability allows B1 to leverage application aware forwarding within the SD-WAN policy, Tom Regan Argumentative Essay also eliminates those anti-replay window implications that can occur when a single flow is fragmented over various WAN More Guns Less Crime Essay paths.

Where the single-homed design varies the most from the dual-homed design is in the functions of R1. Traffic with ToS markings of 0 will be forwarded over the best effort transport via Path 2. Given the benefits of the single-homed design, the question arises as to whether true SD-WAN capabilities are needed where R1 is located that is, behind the IVD devicessince this solution targets per-hop Macbeth Shades Of Cool Analysis scheduling only. This decision will qos research papers a case-by-case, customer-by-customer decision. Customers looking to leverage a more intelligent WAN solution over an IVD-based infrastructure can do so with very innovative designs.

Those customers wanting a very highly available WAN design with an application-aware routing capability should consider the dual-homed design using the TLOC extension enhancement. Customers that deploy only single-homed solutions but want to take advantage of the other operational capabilities SD-WAN has to offer can do so. Even those customers that require intelligence on the qos research papers side of the IVDs can leverage a level of application intelligence with the advanced classification and application routing methods described in this paper.

These can be run in multiple types of x86 offerings, including in public clouds such as AWS or Azure. This solution suite for Network Functions Virtualization NFV would also include the orchestration element and, because it is virtual, could include additional VNFs firewall, intrusion detection system, third-party applicationsincluding the Software- Defined Networking SDN orchestration capability for the day-0 configuration that NFV offers. In addition, the modern WAN must deliver: Optimized cloud access: Many networking cloud solutions offer an inconsistent patchwork of options, and cloud-based applications can deliver a poor user experience.

Figure 1. Figure 2. Features Benefits Centralized policy and distributed enforcement The Overlay Management Protocol OMP centrally influences all routes and policy information for each segment of the network. Scale-out architecture with redundancy Multiple devices can be added to supplement capacity and provide redundancy. End-to-end network segmentation End-to-end network segmentation can be facilitated rapidly without additional control plane protocols. Figure 3. Component Description Cisco vManage Cisco vManage is a centralized dashboard that facilitates automatic configuration, management, and monitoring of the overlay network. Cisco vSmart controller Qos research papers vSmart controllers establish secure SSL connections to legalizing illegal immigrants essay other components in the network.