Please enable JavaScript.
Coggle requires JavaScript to display documents.
DFC 20143 INTRODUCTION TO NETWORK (T1.2) - Coggle Diagram
DFC 20143
INTRODUCTION TO NETWORK
(T1.2)
1.2.1 Explain purpose of the Cisco IOS
embedded software architecture in all of the Cisco router
is OS of the catalyst switches
Cisco provided network services:
basic routing and switching function
reliable and secure access to networked resources
network scalability
Router user interface
Cisco IOS use CLI (traditional console environment)
Console
Dialup connection
Telnet to the router
Access methods
Console port
Secure shell (SSH)
Telnet
Navigate Between IOS Modes
move user EXEC mode to privileged EXEC mode
Use return to user EXEC mode
2 more items...
use the
enable command
OS
(all electronic devices need OS)
a) OS shell
enables user to interface with application
b) OS kernel
communicate directly with hardware and manages how the resources are used to meet software requirement
c) Hardware
physical part of computer including underlying electronics
Purpose of OS
a) GUI (enables user)
use mouse (make selections and run programs)
enter text and text-based commands
b) CLI os Cisco IOS switch/router (enable network technician)
use keyboard (make selections and run programs)
use keyboard enter text and text-based commands
Configuration Command Modes
1 more item...
All devices come with a default IOS and feature set (possible upgradable)
Basic IOS Command Structure
:
IOS Command Syntax
Hot Keys and Shortcuts
IOS Help Features
IOS Context-Sensitive Help
help provides a list of commands and the
arguments associated with those commands
within the context of the current mode
To access context-sensitive help, enter a question mark ?, at any
prompt.
IOS Command Syntax Check
The command line interpreter checks an entered command from left to right
to determine what action is being requested
If the interpreter understands the command, the requested action is executed and the CLI returns to the appropriate prompt.
If the interpreter discovers an error, the IOS generally provides feedback
such as “Ambiguous command”, “ous command”, “Incomplete command”, or “Incorrect command”
Cisco IOS Modes of Operation
IOS Modes
a) User EXEC Mode
monitoring commands
b) Privileged EXEC mode
accesses all router commands
c) Global Configuration mode
allow modify the running system
configuration
use a
hierarchical command
structure
Each mode has a distinctive
prompt & used to
accomplish particular tasks
with a specific set of commands that are
available only to that mode
Cisco CLI
the primary
user interface used for configuring, monitoring, and maintaining Cisco devices
allows you to directly and simply execute
Cisco IOS commands, whether using a router console or terminal, or using remote access methods
1.2.4 How devices communicate accross network media
Overview of Network Components
Devices
Media
Services
End Devices
Network Media
What is the maximum distance that the media can successfully carry a signal?
Into what type of environment will the media be installed?
What is the amount of data and the speed at which it must be transmitted?
What is the cost of the media and installation?
iOS app CPI Globally – $0.86
Android app CPI Globally (Google Play market) – $0.44
iOS app CPI in US – $2.07
Android app CPI in US (Google Play market) – $1.72
Cost Per Install on Facebook Ads – $1.8
Cost Per Install on Twitter Ads – $2.53
Cost Per Install on Instagram Ads – $2.23
Cost Per Install on Search Ads – $1.00
K = kilo = 1,000 bits
M = mega = 1,000 kilo = 1,000,000 bits
G = giga = 1,000 mega = 1,000,000,000 bits
T = tera = 1,000 giga = 1,000,000,000,000 bits
Networks are divided into two types, a LAN (Local Area Network) or a WAN (Wide Area Network), which are generic terms referring to two important basic types of networks.
Network media is the actual path over which an electrical signal travels as it moves from one component to another. As long as there is require no specific bearer and radiate their signals as electromagnetic waves.
Network Representations
Topology Diagrams
Physical Topology
Logical Topology
Intermediary Network Devices
regenerate and retransmit data signals - maintain information about what pathway exist through the network and internetwork
notify other devices of errors and communication failures
direct data along alternate pathways when there is a link failure
classify and direct messages according to priorities
permit / deny the flow of data, based on security settings
