Network Essentials: Security, Components, and Usage
Network Passwords and Security
Usually, you need a password to use a network. It is important to keep your password secret. The following rules make a password more difficult to guess:
- Should be at least 6 characters long.
- Have a mixture of numbers and letters.
- Include both capital and small letters.
- Be easy to remember.
Should not:
- Be a word from a dictionary.
- Be a common name.
- Include spaces, hyphens, dots, or
*$.
If the cable fails, the whole network will fail. If you don’t use the right password, you
Read MoreJDBC: Connecting Java Applications to Databases
Introduction to JDBC (Java Database Connectivity)
JDBC stands for Java Database Connectivity. JDBC is a Java API used to connect and execute queries with a database. It is a specification from Sun Microsystems that provides a standard abstraction (API or protocol) for Java applications to communicate with various databases. It provides the language with Java database connectivity standards and is used to write programs required to access databases. JDBC, along with the database driver, can access
Read MoreOperating Systems: Essential Concepts and Evolution
Operating Systems
An operating system (OS) is a program, or set of computer programs, designed to allow effective management of a computer’s resources. It manages the hardware of the machine from the most basic levels, allowing user interaction.
Basic Functions
An OS enables and simplifies the management of a PC. It plays a number of essential basic functions, each performed by an internal component:
- Provides comfort in using resources efficiently.
- Manages equipment for running services, the user interface,
Understanding Database Concepts: Definitions and Models
Understanding Database Concepts
Tip: A set of characters that have a specific meaning.
Information: Specific data according to user needs.
Field: A space filled with requested data.
Registration: Fields of similar or different types filled with information.
File: A collection of records following a defined structure.
Database: A collection of files created to encompass and reduce information. Its three components are hardware, DBMS software, and the data being handled.
DBMS (Database Management System)
Read MoreProcesses and Threads
Processes
A process is a running program, including the current value of the program counter (PC), registers, and variables. Processes are managed by the operating system and consist of:
- Instructions to be executed by the microprocessor.
- Implementation status (register values).
- Working memory (reserved memory and its contents).
- Information for operating system scheduling.
Process States
Running: The process is being executed on the CPU. Only one process can be in this state on a uniprocessor system.
Ready:
Read MoreParallel vs. Serial Data Transmission: Types & Channels
Parallel vs. Serial Data Transmission
Parallel Transmission:
In parallel transmission, all bits are transmitted simultaneously, followed by a brief pause before the next set of bits. This type of transmission typically occurs inside a machine or between machines when the distance is very short.
The main advantage of parallel transmission is its high transmission rate. The biggest disadvantage is the cost.
Data multiplexing can also be considered a form of parallel transmission, where data is transmitted
Read More