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Chapter 1 Network Communication - Coggle Diagram
Chapter 1
Network Communication
Introduction
Internet of Everything (IoE)
bringing together
people, process, data, and things to make networked
connections more relevant and valuable
Cloud
store documents and
pictures and access them anywhere, anytime.
All computers connected to a network that participate
directly in network communication are classified as HOST and END DEVICE
HOST
can send and receive messages on the network.
END DEVICE can act as
CLIENT
SERVERS
computers with software that allow them to provide information, like email or web pages, to other end devices on the network
Each service requires separate server software.
PEER TO PEER NETWORK
a host can become client and
server at the same time
Advantage
Easy to set up
Less complexity
Lower cost since network devices and dedicated servers may not be required
Can be used for simple tasks
sharing printers
transfering file
Disadvantage
All device may act as both clients and servers which can slow their performance
No centralized administrations
Not secure
Not scalable
Network Components
network infrastructure
media
medium that provides the channel over
which the message travels from source to destination
common media
Glass or plastic fibers (fiber optic cable)
Wireless transmission
Metallic wires within cables
services
include many of the common network applications people use every day,
email hosting services
web hosting services
usually provided by the servers and accessed via a network by clients.
devices
End devices
Computers (work stations, laptops, file servers, web
servers)
Network printers
The network devices that form the interface between
users and the underlying communication network.
VoIP phones
Telepresence endpoint
Mobile handheld devices
smartphones,
tablets, PDAs, and wireless debit/credit card readers
barcode scanners
Security cameras
Intermediary devices (Interconnect end device)
Network Access (switches and wireless access
points)
connect
individual hosts to
the network
multiple individual
networks to form an internetwork
Internetworking (routers)
provide connectivity and work behind the scene to ensure that data flows across the network
Security (firewalls)
Internet Connections :
Home users, remote workers, and small offices typically
require a connection to an ISP to access the internet.
Connection options vary greatly between ISPs and
geographical locations
CABLE
offered by cable television service
providers
provides
high availability
always-on
connection to the internet
high
bandwidth
the internet data signal transmits on the same
cable that delivers cable television
DSL
(Digital Subscriber Lines)
provide
high
bandwidth
high availability
always-on
connection to the internet
runs over a telephone
line
small office and home office users
connect using Asymmetrical DSL (ADSL) - the download speed is faster than the upload speed
Network Representations
the ability to recognize the logical representation of the physical networking components is critical to being able to visualize the organization and operation of a network
A network diagram provides an easy way to understand
how devices connect in a large network.
Topology (diagrams provide a visual ma of how the network is connected)
Physical
Identify the physical location of intermediary
devices, configured ports, and cable installation.
Logical
Identify devices, ports, and IP addressing scheme.
Types of Networks
Network infrastructures can vary greatly in terms of
Number and types of services available
Number of users connected
Area of responsibility
Size of the area covered
Type of Network Infrastructure
Local Area Network (LAN)
usually administered by a single organization
or individual
interconnect end devices in a limited area
school
office
home
campus
provide high-speed bandwidth to internal end
devices and intermediary devices.
provides access to users
and end devices in a small geographical area
Wide Area Network (WAN)
usually administered by multiple service
providers.
interconnect LANs over wide geographical
areas
provinces
country
cities
continent
typically provide slower speed links between
LANs
provides access to other
networks over a wide geographical area
INTRANET
A private connection of LANs and WANs that belongs to an organization, and is designed to be accessible only by organization's members , employees, or others with authorization.
EXTRANETS
Provide secure and safe access to individuals who work for a different organizations, but require access to company data. It allows controlled access to group of users to a subset of information
example
A company that is providing access to outside
suppliers and contractors
A hospital that is provide booking system to doctors so they can make appointments for their patiets
INTERNET
A worldwide collection of interconnected networks cooperating with each other to exchange information using common standards.
