Final answer:
TCP/IP is a set of protocols for communication on networks. A network security firewall protects networks from unauthorized access. CSS is used to style webpages. Different types of CSS declarations include inline, internal, and external. The main roles of an operating system are process management, memory management, file and storage management, device management, user interface, and security. A process is a program in execution and has different states.
Step-by-step explanation:
TCP/IP:
TCP/IP stands for Transmission Control Protocol/Internet Protocol. It is a set of protocols that allows computers to communicate over networks, such as the internet. TCP/IP provides reliable and secure data transmission between devices.
Network Security Firewall:
A network security firewall is a hardware or software device that monitors and controls incoming and outgoing network traffic based on predetermined security rules. Its purpose is to protect a network from unauthorized access, viruses, malware, and other cyber threats.
CSS Purpose:
CSS (Cascading Style Sheets) is a styling language used for describing the look and formatting of a document written in HTML. It is used to control the layout, colors, fonts, and other visual aspects of a webpage. CSS allows web designers to separate the content from the presentation, making it easier to maintain and update the design.
CSS Declaration Types:
Inline CSS: Applies the style directly to an HTML element using the 'style' attribute.
Internal CSS: Defined within the 'style' tags in the head section of an HTML file.
External CSS: Stored in a separate file with a .css extension and linked to the HTML file using the 'link' tag.
Roles of an Operating System:
Process management: The operating system manages processes, which are instances of running programs.
Memory management: It allocates and manages memory resources for processes.
File and storage management: It handles file organization, storage, and retrieval.
Device management: It controls and coordinates input/output devices connected to the computer.
User interface: It provides a way for users to interact with the computer through a graphical user interface (GUI) or command-line interface.
Security: It ensures the confidentiality, integrity, and availability of data and resources on the system.
Process and Process States:
In an operating system, a process is a program in execution. It consists of the program code, data, and resources that the program needs to run. Process states include:
New: The process is being created but not yet ready for execution.
Ready: The process is waiting to be assigned to a processor.
Running: The process is currently being executed by a processor.
Blocked: The process is waiting for an event or resource to become available.
Terminated: The process has completed execution.
Demand Paging:
Demand paging is a memory management technique where pages are loaded into memory from secondary storage only when they are needed. This technique allows for efficient utilization of memory resources since only the necessary pages are brought into memory, reducing the amount of initial memory space required.
Round Robin CPU Scheduling:
Round robin is a CPU scheduling algorithm where each process is assigned a fixed time quantum. The scheduler allocates the CPU to each process in a circular manner, allowing each process to execute for a fixed amount of time before moving on to the next process. This algorithm ensures fairness and prevents any single process from monopolizing the CPU.
Modem:
A modem is a device that modulates and demodulates digital signals to enable communication between a computer and a network. It converts digital data into analog signals for transmission over telephone lines or digital signals for transmission over broadband connections. Modems are used for connecting to the internet or other remote networks.
Purpose of HTML Tags:
<h1> - <h6>: These tags are used to define headings and represent different levels of importance.
<p>: Used to define a paragraph of text.
<a>: Creates a hyperlink to other web pages or locations within the same page.
<img>: Inserts an image into a webpage.
<ul> and <li>: Used to create unordered lists.
<ol> and <li>: Used to create ordered lists.
<table>, <tr>, <td>: Used to create tables and define their structure.