Module 01

Describes how parts of a whole work together?

It mostly refers to a network's hardware and how computers, other devices, and cables work together to form the physical network.

refers to how software controls access to network resources.

A network operating system controls access to the entire network.

A NOS

it includes how users and software initially gain access to the network.

Network operating system (NOS)

its a peer to peer network.

1. Simple configuration 2. less expensive compared to other networks

1. Not scalable 2. Not Necesscarily secure 3. not practical for large installations

no computer has more authority than another.

a logical group of computers that a windows server can control

it's the centralized directory database that contains user account information and security for the entire group of computers.

it uses to control access to the network

1. managing client data and other resources 2. ensuring authorized user access. 3. supplying applications and data files to clients.

resources a network makes available to users.

it includes applications and the data provided by these applications.

client computers requests data or a services from a second computer, called the server.

1. Web service 2. Email services 3. DNS services 4. FTP service.

protocols are methods and rules for communications between networked devices.

TCP ( Transmission Control Protocol) IP (internet Protocol)

SMTP is used to send emails to a recipient's email server.

TLS (Transport Layer Security) adds encryptions to other protocols, such as HTTP, But does not provide remote access to a computer.

TLS (transport Layer Security)

A Wide area network, a group of lans that spread over a wied geographical area.

A Metropolitan Area Network: a group of connected Lans in the same geographical area.

Wan is a group of lans spread over a much larger geographical area and MAN is a group of connected lans in the same geographical area.

Campus area network

Personal area network: a much smaller network of personal devices.

your smartphone and computer

7. Application
6. Presentation
5. Session
4.Transport Layer
3.Network Layer
2. Data link layer
1. Physical Layer

Open systems interconnection

To help Users identify what is happening within a networking system.

Provides network services to the end user.

HTTP, HTTPS, SMTP, FTP, POP, IMAP, FTPS

using interactive applications such as outlook, google chrome which can receive data from the presentation layer.

The task of syntax processing or converting data from one format to another.

construct direction, and conclusion of connects between devices.

authentication and reconnection if a network interruption occurs.

responsible for transmission of data across network connections

the routing of data.

sets up links across the physical network

the physical structure of the network.

Application, Presentation, and session are divided into the "applications" Group.
2. Transport, and network layer are divided into the operating systems Group
3. Data Link layer and physical Layer are divided into the hardware group.

Simple Network management Protocol

the data that is passed between applications or utility programs and the OS

Application Programming interface

TCP and UDP.

Transmission control protocol: makes a connection with the end host, checks whether data was received.

User datagram Protocol: does not gurantee delivery by first connecting and checking whether data is receieved.

The process of adding a header to the data inherited from the session layer.

it divides it into smaller messages called segments.

interfacing with physical hardware on the local network.

media access control

Protocol data unit

The Data link layer puts its control information in a data link layer header and also attaches control information to the end of the packet in a trailer.

Safety Data sheet. it explains how to properlu handle substances such as chemical solvents and how to dispose of them.

1. Identify the problem and its symptoms
2. Establish Theory of probable cause
3. test your theory to determine cause
4. Establish a plan for resolving the problem.
5. Implement the solution or escalate the problem.
6. Verify Full functionality and implement preventative measures.
7. Document findings, actions and outcomes.

A printer plugged into a nearby desktop computer.

it is inexpensive.

a domain!

SSH (Secure Shell)

MySQL.

Database management is responsible for making requested changes to the data and organizing the data for viewing,reporting, or exporting.

Structured Query Language: configures and interact with the database's objects and data.

Microsoft SQL server, Oracle database and the open source MySQL.

transport layer security: adds encryption to the other protocols, such as HTTP.

Telnet, SSH, and RDP

its a command line application that allows a user to remote into a computer even though its transmissions are not encrypted.

Creates an encrypted channel or tunnel between 2 computers. which provides security that telnet lacks.

all devices connect to one central device; for eample a keyboard, mouse and monitor and connecting to a central device such as a computer.

the devices would be connected in a line with no device connected to more than 2 other devices.

each device would be connected to exactly 2 other devices.

all devices would be connected to each other.

star topology.

a switch!

it receives incoming data from one of its ports and redirects it to another port or multiple ports that will send the data to its intended destination.

a switch belongs only to its local network and a router belongs to 2 or more networks.

WAN, LAN and PAN

application layer

Transport layer

Data link layer

Rack level

incorporates a sprinkler or gas system that provides fire suppression in parts of a room or throughout the entire room.

Ngnix

identifying the problem.

peer to peer

SQL (structured query language)

RDP (remote desktop

HTTPS

SSH and RDP

Fail-Open Policy

Star

Client-Server