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Notes for computer servicing

This is notes about this subject
Subject

Nursing

4 Documents
Students shared 4 documents in this course
Academic year: 2018/2019
Uploaded by:
Anonymous Student
This document has been uploaded by a student, just like you, who decided to remain anonymous.
Don Alejandro Roces Sr. Science-Technology High School

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CSS 9: 3rd Quarter Reviewer

Topics:

i. Fundamentals of Computer Network

(Network Types)

ii. Network Topologies

iii. Communications Over the Telephone

Network

iv. Modem vs. Router

i. Fundamentals of Computer Network

  • To facilitate the exchange of information between different people and computers.
  • Group of computer systems
  • Linked together through communication channels to facilitate communication.
  • Resource-sharing

Networks are used to:

✓ Facilitate communication (e-mail, video call, messaging)

✓ Enable different clients to share hardware resources —like a printer/scanner

✓ Enable file-sharing

✓ Make data easier to access

Network types depend on how large they are and how much of an area they cover

geographically. Most people who have a basic knowledge of networking are familiar with the

terms LAN and WAN. These are the types of Networks:

1) PAN Personal Area Network

✓ Used on a personal level

✓ For connecting devices such as

phones, tablets, and laptops.

✓ Connect to eachother using

wireless technologies ( Bluetooth,

hotspot, nearby-sharing), but

can also be connected by using a

wired connection such as a USB

cable.

✓ Usually used for transferring small

files katulad ng calendar

appointments, music files, small

document.

✓ Ito yung mga usually ginagamit

ng mga tao kapag may isshare

sila na document ng madalian. Its

easy to control, madali siyang

iturn on and off.

2) LAN Local Area Network

  • Group of devices such as

computers, servers, switches, and

printers which are located in the

same building, such as in an

office or in a home.

  • Close proximity to each other —

keyword: local

  • Common type: Ethernet – where

two or more computers are

connected to Ethernet cables

using a switch.

3) WLAN Wireless Local Area

Network

✓ Uses wireless communication

instead of wired communication.

✓ Having at least two devices that

use wireless communication to

form a local area network.

✓ Typically have a Wi-Fi router or

a wireless access point for

wireless devices such as laptops,

tablets, wireless desktops, and

smartphones, to communicate.

✓ In simpler terms, LAN siya w/o

using cables.

4) CAN Campus Area Network

  • LAN + LAN (or more) = CAN
  • Joins two or more LANs together

within a limited area.

  • Example: A university that has

multiple buildings —in the same

general area— that are connected

to each other to form a larger

network. (the buildings could be

different departments on a

University’s property, with each

building having their own LAN in

their department)

5) MAN Metropolitan Area Network

✓ A larger network than a CAN.

✓ Spans over several buildings in a

city or town.

✓ MANs are typically connected

using a high-speed connection

such as fiber optic cable.

✓ A high-speed network that gives

the ability for sharing data and

resources within a city.

✓ I example nito ay yung mga free

wi-fi sa isang city katulad nung

QCitizens, @QC_FreeGoWiFi,

@QCWiFi, etc.

6) SAN Storage Area Network

✓ Stores and provides access to

large amounts of data.

✓ Basically, it’s a dedicated network

that’s used for data storage.

Consists of multiple disk arrays,

switches, and servers.

✓ One of the main reasons for using

a SAN is because they are not

affected by network traffic such

as bottlenecks that can happen in

a LAN.

✓ SAN aren’t really a part of a LAN,

it’s partitioned off. It’s a network

all by itself.

✓ Ang SAN ay hindi ka-category

and iba kasi it’s all about storage

and stuff.

7) WAN Wide Area Network

  • is the largest type of network.
  • Includes multiple LANs, CANs

and MANs.

  • A network that spans over a large

geographical area such as a

country continent or even the

entire globe.

  • The best example of WAN is the internet.
  • Ito yung super laki na network na pwede

siyang umabot sa buong globe,

continent, country ganon.

ii. Network Topologies

  • the layout of how a network communicates w/ different devices.
  • it can be wired/wireless

Different types:

WIRED:

 Star Topology

  • most common

topology

  • all computers are

connected to a

central wiring point, such as a hub or a

switch

  • all data this topology passes thru the

central hub first before continuing to its

final destination

  • BENEFIT: if one computer failed (or if

there was a brake in the cable), the other

computers wouldn't be affected, each

computer has their own cable

connection.

  • DISADVANTAGE: If the central hub or

switch fails, then all the computers

connected on the central point would be

affected. (A SINGLE POINT OF FAILURE)

 Ring Topology

  • Type of network

configuration

where each

computer is

connected to each other in a shape of

a closed loop or ring.

  • Each data packet is sent around the ring

until it reaches its final destination.

  • Rarely used today.
  • ADVANTAGE: They are easy to install

and easy to troubleshoot.

  • DISADVANTAGE: If just one of the

computers goes down or if there was a

single break in the cable, then all data

flow would be disrupted.

 Bus Topology

  • Each of

the

computers

and

network devices, are connected to a

single cable or backbone.

  • Coaxial cable: The backbone
  • T-connectors are BNC connectors.
    • Requires that the cable is terminated at

both ends using terminators.

  • In order for this setup to remain

operational, there must not be any

open connections, including the ends

that attach to the computers.

  • So, if a computer is removed or if the

terminators are loose or missing, then

the cable would be open and data

would bounce back.

  • The ‘bounce back’ is known as signal

reflection, and if this happens data flow

would be disrupted.

 Mesh Topology

  • each computer on the network is

connected to every other computer on

the network.

  • By having so many connections, it

handles failure very well.

  • ADVANTAGE: It creates a high

redundancy level. Because if one or more

connections fail, the computers would

still be able to communicate with each

other.

  • DISADVANTAGE: Because of the amount

of cabling and network cards that have

to be used, mesh topologies can be

expensive, so they are rarely used on

LANs.

  • They are mainly used on WANs like the

internet.

  • Great example is internet: Because the

internet is made up of numerous routers,

all over the world that are connected to

each other to route data to their

intended

destination. So

even if a few

routers go down,

the data will get

rerouted using a different path to

ultimately reach their destination.

WIRELESS

Infrastructure topology

e. ATM (Asynchronous Transfer Mode) is a service that carries voice, data, video,

and multimedia at extremely high speeds.

iv. Modem vs. Router

Modem

✓ Brings the internet into your home or

business

✓ Establishes and maintains a dedicated

connection to your internet’s service

provider to give you access to the internet.

✓ You need a modem because of the two

different types of signals that are used on

a computer and on the internet.

→ A computer only reads digital

signals,

→ while signals out on the internet are

analog.

✓ As analog data comes in from the internet.

The modem demodulates the incoming

analog signals into a digital signal so that

a computer can understand it

✓ It also modulates outgoing digital signals

from a computer into an analog signal as

it goes out on the internet.

✓ Modem = ‘modulator’ and ‘demodulates’

✓ A modem modulates outgoing data from

a computer and demodulates incoming

data from the internet.

Router

✓ A router comes after a modem.

✓ There are different types of routers; routers that are used in businesses and larger organizations,

and smaller routers used for homes and small businesses. But they pretty much do the same

thing.

✓ A router is what routes or passes your internet connection to all your devices in your home.

✓ It directs it to all of your computers, phones, tablets and so on, so that those devices can access

the internet.

✓ A small office/home router will have a built-in switch with multiple ports so that you can connect

multiple devices using an ethernet connection. It also functions as a wireless access point so that

wireless devices can have internet access.

✓ You don’t need a router if you only want to connect one device.

✓ You need a router because as always, you have multiple devices that you need to connect

to the internet.

Cable DSL

Connected using a coaxial cable Connected using a typical phone line

Modem/Router

Would have a built-in wireless router, in one device

Was this document helpful?

Notes for computer servicing

Subject: Nursing

4 Documents
Students shared 4 documents in this course

School: Don Alejandro Roces Sr. Science-Technology High School

Was this document helpful?
CSS 9: 3rd Quarter Reviewer
Topics:
i. Fundamentals of Computer Network
(Network Types)
ii. Network Topologies
iii. Communications Over the Telephone
Network
iv. Modem vs. Router
i. Fundamentals of Computer Network
- To
facilitate the exchange of information between different people and computers
.
- Group of computer systems
- Linked together through
communication channels
to facilitate communication.
- Resource-sharing
Networks are used to:
✓ Facilitate communication (e-mail, video call, messaging)
✓ Enable different clients to share hardware resources —like a printer/scanner
✓ Enable file-sharing
✓ Make data easier to access
Network types depend on
how large
they are and
how much of an area they cover
geographically
. Most people who have a basic knowledge of networking are familiar with the
terms LAN and WAN. These are the types of Networks:
1) PAN Personal Area Network
✓ Used on a personal level
✓ For connecting devices such as
phones, tablets, and laptops.
✓ Connect to eachother using
wireless
technologies (
Bluetooth,
hotspot, nearby-sharing
), but
can also be connected by using a
wired connection
such as a USB
cable.
✓ Usually used for transferring small
files katulad ng
calendar
appointments, music files, small
document.
✓ Ito yung mga usually ginagamit
ng mga tao kapag may isshare
sila na document ng madalian. Its
easy to control, madali siyang
iturn on and off.
2) LAN Local Area Network
- Group of devices such as
computers, servers, switches, and
printers which are located in the
same building, such as in an
office or in a home.
-
Close proximity to each other
—
keyword: local
- Common type: Ethernet – where
two or more computers are
connected to Ethernet cables
using a switch.
3) WLAN Wireless Local Area
Network
✓ Uses
wireless communication
instead of wired communication.
✓ Having at least two devices that
use
wireless communication
to
form a local area network.
✓ Typically have a Wi-Fi router or
a wireless access point for
wireless devices such as laptops,
tablets, wireless desktops, and
smartphones, to communicate.
✓ In simpler terms, LAN siya w/o
using cables.
4) CAN Campus Area Network
- LAN + LAN (or more) = CAN
- Joins two or more LANs together
within a
limited area.
-
Example:
A university that has
multiple buildings —in the same
general area— that are connected
to each other to form a larger
network.
(the buildings could be
different departments on a
University’s property, with each
building having their own LAN in
their department)
5) MAN Metropolitan Area Network
✓ A larger network than a CAN.
✓ Spans over
several buildings in a
city or town.
✓ MANs are typically
connected
using a high-speed connection
such as fiber optic cable.
✓ A high-speed network that gives
the ability for sharing data and
resources within a city.
✓ I
example
nito ay yung mga free
wi-fi sa isang city katulad nung
QCitizens, @QC_FreeGoWiFi,
@QCWiFi, etc.
6) SAN Storage Area Network
✓ Stores and provides access to
large amounts of data.
✓ Basically, it’s a dedicated network
that’s
used for data storage
.
Consists of
multiple disk arrays,
switches, and servers.

Students also viewed

Related documents