Extra Files

Network Essentials Question Sets

Networking Essentials Hands-on

Words

Test Dates

Module 1: Communication in a Connected World

Data Category Definition Real-World Example Study Mnemonic
Volunteered Data that an individual explicitly, knowingly, and actively shares about themselves. Creating a social media profile, filling out a survey, or entering a credit card during checkout. "Active Sharing" (You typed it in)
Observed Data captured automatically by recording the actions and behaviors of an individual. GPS location tracking on your phone, web browsing history/cookies, or store security cameras. "Passive Tracking" (You did it, they recorded it)
Inferred Data about an individual calculated by analyzing their volunteered and observed data. Your Credit Score, a retail store predicting you are pregnant based on buying habits, or predictive search suggestions. "Analytical Deduction" (Machine-made guesses)
Secret Highly restricted, private data that is legally or technically protected from unauthorized access. Military-grade classified data (Secret/Top Secret), biometric keys, or strictly protected medical records (HIPAA). "Locked Down" (Need-to-know access only) 
  [ Volunteered Data ]               [ Observed Data ]
 (What you say you do)              (What you actually do)
          \                                 /
           \                               /
            v                             v
         =====================================
         [         Inferred Data             ] --> (What they GUESS you will do next)
         =====================================
                          ^
                          | (Requires strict protection if sensitive)
                          v
         =====================================
         [          Secret Data              ] --> (Strictly protected/classified info)
         =====================================

Module 5: Communication Principles

TCP/IP Model: Application, Transport, Internet, Network Access

TCP/IP Model

TCP/IP model layer Function
Application Represents data to the user, data encoding, and dialog control.
Transport Supports communication between diverse devices across networks.
Internet Determines the best path to forward data through the network.
Network Access Controls hardware devices and media that make up the network.
Protocol Function
Application protocol Governing the way a web server and a web client interact.
Transport protocol Managing the individual conversations between web servers and web clients.
Internet protocol Taking the segments from transport protocol, encapsulating them into packets, and assigning them with appropriate addresses.
Network access protocol Preparing packets to be transmitted over the network media.

OSI Model

OSI Model Layer Description
7 - Application The application layer contains protocols used for process-to-process communications.
6 - Presentation The presentation layer provides from common representation of the data transferred between application layer services.
5 - Session The session layer provides services to he presentation layer to organize its dialogue and to manage data exchange.
4 - Transport The transport layer defines services to segment, transfer, and reasssemble the data for individual communications between the end devices.
3 - Network The network layer provides services to exchange the individual preces of data over the network between identified end devices.
2 - Data Link The data link layer protocols describe methods for exchanging data frames between devices over a common media.
1 - Physical The physical layer protocols describe the mechanical, electrical, functional, and procedural means to activate, maintain, and de-activate physical connections for a bit transmission to and from a network device.

Model comparison

OSI Model TCP/IP Model
Application Application
Presentation
Session
Transport Transport
Network Internet
Data Link Network Access
Physical

Module 6: Network Media