Cloud Concepts Flashcards
(15 cards)
Data Centers
Specialized facility that provides infrastructure and resources necessary to run applications and store data. It hosts network services (DHCP, DNS), application servers, and storage (SANs).
Data center network topologies
- Traditional design: Core > Distribution > Access | mostly north-south traffic
- Modern design (cloud/virtualization): East-west traffic.
North-south traffic
Traffic that goes in/out of the data center like client to server request.
East-west traffic
Traffic inside the datacenter between servers
Zero Trust Architecture
Every internal connection requires authentication and authorization
Top-of-Rack Switches
They are located at the top of the rack on the lead layer.
Storage Area Network
A dedicated network that provides high-speed access to storage devices like HDD or SSD. SANs are isolated from the regular network.
Direct-Attached Storage (DAS)
Storage installed inside the server like SSD or HDD.
What is Fibre Channel (FC)
High-speed network communication protocol used to implement SANs.
Fibre Channel key components
1.Initiator: Client device of the SAN such as a file or database server installed with a fibre channel host bus adaptor (HBA).
2. Target: Storage device port like RAID or tape libraries.
3. FC switch (fabric): Connects initiators and targets.
Types of SAN
- Fibre Channel
- Converged Ethernet
- TCP/IP-based SANs
How the initiators and targets are identified?
By 64-bit WorldWide Names (WWN). Nodes can allocate their own WWN referred to as a WWNN (WorldWide Node Name) and a node can have its own WorldWide Port Name (WWPN).
How does Converged Ethernet work?
To send fiber channel packets over lossless Ethernet.
Types of Converged Ethernet
- Fiber Channel over Ethernet (FCoE): Duns fiber channel packets over lossless Ethernet.
- NVMe over Remote Direct Memory Access (RDMA) over Converged Ethernet (RoCE): improves performance by offloading storage processing from CPU/OS.
