Notes for BSc CSIT

  CLOUD SERVICES Cloud computing service models are divided into three categories: Infrastructure as a Service (IaaS), Platform as a Service (PaaS), and Software as a Service (SaaS) (SaaS). There are evident distinctions between the three in terms of what they can provide a business in terms of storage and resource sharing, but they may also interact with one another to build a single comprehensive cloud computing platform. 1. IaaS (Infrastructure as Service):  This is the most prevalent cloud computing service architecture since it provides the underlying infrastructure of virtual servers, networks, operating systems, and data storage devices. It provides the flexibility, stability, and scalability that many organizations desire from the cloud while eliminating the need for hardware in the office. This makes it excellent for small and medium-sized businesses seeking a cost-effective IT solution to support business growth. IaaS is a completely outsourced pay-for-use service that is acc

  Cloud The “cloud” in cloud computing can be defined as the set of hardware, networks, storage, services, and interfaces that combine to deliver aspects of computing as a service. Cloud services include the delivery of software, infrastructure, and storage over the Internet. A cloud service is any service made available to users on demand via the Internet from a cloud computing provider's servers as opposed to being provided from a company's own premises servers explained before, the most common cloud service is that one offers data storage disks and virtual servers, i.e. infrastructure. Examples of Infrastructure-as-a-Service (IaaS) companies are Amazon, Rackspace, and Flexi scale. Cloud computing is the use of computing resources (hardware and software) that are delivered as a service over a network (typically the Internet).  Cloud computing is the on-demand availability of computer system resources, especially data storage (cloud storage) and computing power, without direct

 Disaster recovery (DR)   Disaster recovery (DR) is an area of security planning that aims to protect an organization from the effects of significant negative events. DR allows an organization to maintain or quickly resume mission-critical functions following a disaster. A disaster can be anything that puts an organization's operations at risk, from a cyberattack to equipment failures to natural disasters. The goal with DR is for a business to continue operating as close to normal as possible. The disaster recovery process includes planning and testing and may involve a separate physical site for restoring operations. The recovery point objective (RPO) differs from the recovery time objective (RTO):- Recovery point objective (RPO) and recovery time objective (RTO) are two important measurements in disaster recovery and downtime. RPO is the maximum age of files that an organization must recover from backup storage for normal operations to resume after a disaster. The recovery point

Data center virtualization  Data center virtualization is the process of designing, developing, and deploying a data center on virtualization and cloud computing technologies. It primarily enables virtualizing physical servers in a data center facility along with storage, networking, and other infrastructure devices and equipment. Data center virtualization usually produces a virtualized, cloud, and collocated virtual/cloud data center. Virtualization, Offering profound changes to the way data centers perform, virtualization makes sense on multiple levels.  The benefits of data center virtualization are as below: 1. Less heat buildup Millions of dollars have gone into the research and design of heat dissipation and control in the data center. But the cold, hard fact is, all of those servers generate heat. The only way around that? Use fewer servers. How do you manage that? Virtualization. Virtualize your servers and you're using less physical hardware. Use less physical hardware an

Manages Service Providers (MSP)  A managed service provider (MSP) is a company that remotely manages a customer's IT infrastructure and/or end-user systems, typically on a proactive basis and under a subscription model. The MSP business model differs from other types of channel companies, such as value-added resellers (VARs), in numerous ways described below. MSPs charge for their services under a number of different pricing models. Typical approaches include per-device, per-user and all-inclusive pricing. 2nd part In the past, the concept of providing a service involved much more than inventing and designing the service, itself. The appropriate amount and quality of hardware were required for every company to not only build their service but have an adequate amount of space to hold and maintain the hardware for the life of each service, as well. Fortunately, that on-premise era is slowly but surely passing, leaving those rather dated companies still attempting to manage their own

 Service-oriented architecture (SOA)   Service-oriented architecture (SOA) is a software development model for distributed application components that incorporates discovery, access control, data mapping, and security features. Service-oriented architecture (SOA) is a software development model for distributed application components that incorporates discovery, access control, data mapping, and security features. The use of services provides major benefits: In contrast to the use of large applications, which tend to be “information silos” that cannot readily exchange information with each other, the use of finer-grained software services gives freer information flow within and between enterprises. Integrating major applications is often expensive. SOA can save integration costs. Organizing internal software as services makes it easier to expose its functionality externally. This leads to increased visibility that can have business value, for example, when a logistics company makes the

Intrusion Detection System (IDS)  An Intrusion Detection System (IDS) is a network security technology originally built for detecting vulnerability exploits against a target application or computer. Intrusion Prevention Systems (IPS)extended IDS solutions by adding the ability to block threats in addition to detecting them and has become the dominant deployment option for IDS/IPS technologies. This article will elaborate on the configuration and functions that define the IDS deployment. Active and passive IDS An active Intrusion Detection System (IDS) is also known as Intrusion Detection and Prevention System (IDPS). The intrusion Detection and Prevention System (IDPS) is configured to automatically block suspected attacks without any intervention required by an operator. Intrusion Detection and Prevention System (IDPS) has the advantage of providing real-time corrective action in response to an attack. Network Intrusion detection systems (NIDS) and Host Intrusion detection systems (HI