Podcast
Questions and Answers
Which communication protocol requires an additional layer of WS-Security for working with HTTPS?
Which communication protocol requires an additional layer of WS-Security for working with HTTPS?
- REST
- HTTP
- FTP
- SOAP (correct)
What aspect of REST makes it a better choice for modern applications like mobile apps?
What aspect of REST makes it a better choice for modern applications like mobile apps?
- Scalability and flexibility (correct)
- Error handling logic
- Intermediary handling
- Communication overhead
Which API type is recommended to use REST according to the text?
Which API type is recommended to use REST according to the text?
- Hybrid APIs
- Legacy APIs
- Public APIs (correct)
- Private APIs
Why does REST not require additional overheads when supporting HTTPS?
Why does REST not require additional overheads when supporting HTTPS?
Which design aspect do modern applications benefit from when using REST APIs?
Which design aspect do modern applications benefit from when using REST APIs?
What makes SOAP more reliable compared to REST according to the text?
What makes SOAP more reliable compared to REST according to the text?
In what scenario might you be better off continuing with SOAP instead of REST?
In what scenario might you be better off continuing with SOAP instead of REST?
What is the purpose of WS-Security in SOAP messages?
What is the purpose of WS-Security in SOAP messages?
What type of applications work better with REST APIs according to the text?
What type of applications work better with REST APIs according to the text?
Which API type may benefit from the tighter security measures in WSSecurity provided by SOAP?
Which API type may benefit from the tighter security measures in WSSecurity provided by SOAP?
Study Notes
ESXi Overview
- Type 1 hypervisor developed by VMware, installs directly on physical servers.
- Key Components:
- Unix Microkernel
- VMware Kernel (VMkernel)
vCenter and vSphere Client
- vCenter: Manages ESXi servers and virtualized data center components on a dedicated server.
- vSphere Client: GUI program enabling remote connection to vCenter and ESXi for administration.
Server Virtualization Benefits
- Enhances efficiency by allowing multiple virtual machines (VMs) to run on a single server.
- Allocates computing resources effectively by using less hardware.
Storage Virtualization
- Pooled storage capacity distributed to VMs through:
- Creation of logical storage partitions, known as LUNs (Logical Unit Numbers).
- LUNs are utilized to develop a datastore.
- VMs utilize VMDK (.vmdk) files stored in datastores for storage, while VM configuration files are saved as VMX (.vmx) files.
Network Virtualization
- Transforms physical network components into a virtual network.
- vSwitch: A virtual switch enabling communication between virtual devices.
- VLAN: A method for network segmentation that allows for the consolidation of applications.
Cloud Computing Fundamentals
- Cloud computing: On-demand delivery of shared computing resources, software, or data via the internet.
- Major service models:
- Software as a Service (SaaS)
- Platform as a Service (PaaS)
- Infrastructure as a Service (IaaS)
- Cloud deployment models vary by control and location, including:
- Private Cloud
- Community Cloud
- Public Cloud
- Hybrid Cloud
Virtual Machine Movements
- vMotion: Facilitates live migration of running VMs between ESXi hosts without interruption, enhancing resource availability.
- Storage vMotion: Moves running VM disks and configurations between datastores while maintaining service continuity.
High Availability (HA) and Distributed Resource Scheduler (DRS)
- HA: Clusters hosts and VMs to ensure that VMs on failed hosts restart on functioning alternate hosts.
- DRS: Manages resource distribution in HA clusters for optimal performance and monitoring.
SOAP APIs
- SOAP: A rigid communication protocol with standards for data exchange.
- Related standards include:
- WS-Security for secure messaging with tokens.
- WS-Addressing for routing metadata inclusion.
- WS-ReliableMessaging standardizing error handling.
- WSDL: Describes service scope and functionality.
- SOAP requests are sent wrapped in a SOAP envelope, allowing for communication across various transport protocols and always return XML documents.
REST APIs
- REST: Architectural style for API development adhering to six key principles:
- Client-server architecture allows independent technology and platform.
- Layered system enables multiple intermediaries in server communication.
- Uniform interface mandates standard data format for usability.
- Stateless requests ensure independence of each operation.
- Cacheable responses enhance efficiency in data retrieval.
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Description
Learn about the components of VMware ESXi, a Type 1 hypervisor software, including the Unix Microkernel, VMware Kernel (VMkernel), vCenter, and vSphere Client. Explore how server virtualization is achieved through these components.
