Understanding Computer Networks: Protocols, Types, and Security
Computer Networks
Internet Protocols & Hardware
Internet communication relies on a set of rules and protocols, similar to how humans communicate. Internet hardware enables the connection.
- Examples: TCP, Ethernet, Handshaking, UDP, FTP, HTTP, Telnet, SSH. Network hubs, switches, routers, and dedicated cabling are examples of network hardware.
- Applications: Internet protocols are applied to network hardware to enhance security.
Network Types
LANs – Local Area Network
A LAN serves a local area, typically
Java Servlet and Swing Code Examples
Result Servlet
This servlet generates random numbers and forwards to Guess.html.
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Random;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
@WebServlet(
Billing System: Data, Processes, and Meter Management
Billing System Reference Data
Overview of Billing System
Description of flow of information amongst various modules belonging to the Billing System.
Description of Customer Account modelling + table design.
Category, Supply Type association determining Tariff
Association between accounts – Bulk Meter, Docker’s Flat
Description of Living Quarters
Grouping of Accounts by walks, sections, areas for meter reading.
Flags: Bill NOT Bill, Disconnection Flag
Description of views: bil_vat_categories, bil_item,
Read MoreMemory Interleaving and Cache Memory Optimization
(2.4) Interleaved Memory: Idea: Divide the memory into independent modules to allow simultaneous access to several words in different modules (interleaving). • Efficiency condition: references to memory modules are distributed equitably, with a distribution key. • Ideal Location: The width of the memory access band is multiplied by # d modules. • Total Memory = N = 2n words / / No. of Modules = M = 2m. Schemes – There are 2 schemes, and with either, M parallel words can be obtained with each
Read MoreCSS Properties, Selectors, Syntax and Usage
CSS (Cascading Style Sheets) in one page |
| Contents: Templates: Style sheet into the document, Link to an external style sheet, Syntax; Main elements: Media types, Selectors, Properties; Properties: Box, Show boxes (Controlling box generation), Visual superposition of boxes (Positioning schemes), Visual effects, Colors, Background, Fonts, Text, Generated content, Automatic counters and numbering, Lists, Tables; Supplemental information: Units, Box model; Other: Appendix “CSS Property |
XML Structure: Elements, Attributes, and Syntax
| 1.0″ encoding=”UTF-8” standalone=”no“?> | XML Declaration | |
| White space characters (space, carriage return, line feed, tab, etc) | ||
| Comments | ||
| your_documents_css.css”?> | External style sheet for browse your xml document | |
| <?word document=”test.doc” ?> | Processing Instruction | |
| root_element [ root_element (#PCDATA)> ]> | Internal DOCTYPE Declaration, and/or | |
| root_element SYSTEM “your_documents_dtd.dtd“> | External DOCTYPE Declaration | |
| root_element> | Open tag of “root_element“ | |
| subElement> | Open tag |