Digital environments 7.1.1

• What is a supervisor?

  Software that splits the hardware's resources into virtual machines
• 5 properties of a digital device?

  Physical size

  Storage

  Processing speed

  RAM

  Internet connectivity
• A server is used to provide services from a centralized location for easier maintenance, and management
• Internet enabled devices are part of IOT and are nonstandard computing devices. IoT devices connect to networks to allow them to provide input or serve output. Good examples are smart speakers (alexa), and wireless inventory trackers (shipping business)
• What is a personal computer?

  A computer that is designed for use by one person at a time
• List all types of servers:

  File

  application

  Database

  Print

  Virtual

  Mail

  Web

  DNS

  Hybrid
• File servers:

  Purpose of server - to store and transfer general files

  How does it work - Provides access to it's drives on a network

  Features - generally will have high bandwidth to transfer these files, with a high amount of storage capacity and raid arrays for speed and data maintaining
• Application servers:

  Purpose of sever - remotely use software

  How it works - Runs the software with VM software and then partitions it to allow multiple devices to run it

  Features - Will generally have very high tier hardware with many cores, and graphics cards with very large amounts of VRAM. Does not need a lot of storage
• Database servers:

  Purpose of server - Store and manipulate datasets

  How it works - Will have large arrays formatted to store specific data which it will store, generally in a directory based system as plaintext

  Features - very little graphical processing but high bandwidth connection to transmit data. Additionally ram and processor to manipulate it
• Print servers:

  Purpose of server - to store documents, and manage print resources

  How it works - Receives documents through network and then allocates them a position in print order and then sends it to the printer to print

  Features - Generally weak hardware with relatively high memory and storage (1gb), with a 5MHz processor. Centralizes printing control
• Virtual servers:

  Purpose of server - To provide a virtual environment to work within, partitioned from the rest of the system and network
• Virtual servers:

  How it works - Uses software to partition a system ad-hoc and allocates resources accordingly
• Virtual servers:

  Features -

  Secure

  Private

  Adaptable

  Expensive

  Can be redundant

  Has to have better hardware than whatever is being emulated
• Mail servers:

  Purpose of server - To store, transfer and manage mail
• Mail servers:

  How it works - Receives mail, organises and manipulates and stores mail
• Mail servers:

  Features -

  Generally formatted partitions

  Lightweight

  Diverse software

  Must be secure
• Domain name server (DNS):

  Purpose of server - Links an IP address to it's domain name
• DNS:

  How it works- Uses protocols to convert to and fro
• DNS servers:

  Features -

  High bandwidth

  Fast processor speed

  Low storage/memory/cache
• Hybrid servers:

  Purpose - Hybrid servers offer power of a classic dedicated server with the flexibility of cloud computing
• Hybrid servers:

  How does it work - Separated into hybrid server environments with virtualization, each is isolated with guaranteed resources
• Hybrid servers:

  Features:

  Isolation

  Guaranteed resources

  Virtualization

  Compatibility

  Versatility
• Web servers:

  Purpose - Runs all processes for a website allowing it to function
• Web servers:

  How it works - Receives command through the internet, as it is assigned to an IP address and then fulfills the command and return anything to the specified IP address
• Web servers:

  Features -

  Fast bandwidth

  Fast