12
TLE-Computer
Systems
Servicing
SELF-LEARNING MODULE
DIVISION OF GENERAL SANTOS CITY
1
Computer Network Concepts
Week
Quarter 1 – Module 1:
Computer Systems Servicing - 12
Self-Learning Module (SLM)
Quarter 1 – Module 1: Computer Network Concepts
First Edition, 2020
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Development Team of the Module
Writers: Elvis J. Piquero
Editors: Wilma M. Abendan, Ilene E. Pinili
Reviewers: Amalia C. Caballes, Sally A. Palomo
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Layout Artist: Wilma M. Abendan
Cover Art Designer: Reggie D. Galindez
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Mario M. Bermudez, CESO VI – Asst. Schools Division Superintendent
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Name of REPS – Subject Area Supervisor
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Gregorio O. Ruales - Division ADM Coordinator
Amalia
EPP/TLE/TVL
C.
Caballes
–
Education
Program
Supervisor
SELF-LEARNING MODULE
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DIVISION OF GENERAL SANTOS CITY
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E-mail Address:
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12
SELF-LEARNING MODULE
DIVISION OF GENERAL SANTOS CITY
1
Quarter 1 – Module 1:
Computer Network Concepts
Week
TLE-Computer
Systems
Servicing
Introductory Message
For the facilitator:
Welcome to the Computer Systems Servicing 12 Self-Learning Module (SLM) on
Computer Network Concepts!
This module was collaboratively designed, developed and reviewed by educators
both from public and private institutions to assist you, the teacher or facilitator in
helping the learners meet the standards set by the K to 12 Curriculum while
overcoming their personal, social, and economic constraints in schooling.
This learning resource hopes to engage the learners into guided and independent
learning activities at their own pace and time. Furthermore, this also aims to help
learners acquire the needed 21st century skills while taking into consideration
their needs and circumstances.
In addition to the material in the main text, you will also see this box in the body of
the module:
Notes to the Teacher
This contains helpful tips or strategies
that will help you in guiding the learners.
As a facilitator you are expected to orient the learners on how to use this module.
You also need to keep track of the learners’ progress while allowing them to
manage their own learning. Furthermore, you are expected to encourage and assist
the learners as they do the tasks included in the module.
For the learner:
Welcome to the Computer Systems Servicing 12 Self-Learning Module (SLM) on
Computer Network Concepts!
The hand is one of the most symbolized part of the human body. It is often used to
depict skill, action and purpose. Through our hands we may learn, create and
accomplish. Hence, the hand in this learning resource signifies that you as a
learner is capable and empowered to successfully achieve the relevant
competencies and skills at your own pace and time. Your academic success lies in
your own hands!
This module was designed to provide you with fun and meaningful opportunities
for guided and independent learning at your own pace and time. You will be
enabled to process the contents of the learning resource while being an active
learner.
This module has the following parts and corresponding icons:
What I Need to Know
This will give you an idea of the skills or
competencies you are expected to learn in
the module.
What I Know
This part includes an activity that aims to
check what you already know about the
lesson to take. If you get all the answers
correct (100%), you may decide to skip this
module.
What’s In
This is a brief drill or review to help you link
the current lesson with the previous one.
What’s New
In this portion, the new lesson will be
introduced to you in various ways such as a
story, a song, a poem, a problem opener, an
activity or a situation.
What is It
This section provides a brief discussion of
the lesson. This aims to help you discover
and understand new concepts and skills.
What’s More
This comprises activities for independent
practice to solidify your understanding and
skills of the topic. You may check the
answers to the exercises using the Answer
Key at the end of the module.
What I Have Learned
This
includes
questions
or
blank
sentence/paragraph to be filled in to process
what you learned from the lesson.
What I Can Do
This section provides an activity which will
help you transfer your new knowledge or
skill into real life situations or concerns.
Assessment
This is a task which aims to evaluate your
level of mastery in achieving the learning
competency.
Additional Activities
In this portion, another activity will be given
to you to enrich your knowledge or skill of
the lesson learned. This also tends retention
of learned concepts.
Answer Key
This contains answers to all activities in the
module.
At the end of this module you will also find:
References
This is a list of all sources used in developing this module.
The following are some reminders in using this module:
1. Use the module with care. Do not put unnecessary mark/s on any part of
the module. Use a separate sheet of paper in answering the exercises.
2. Don’t forget to answer What I Know before moving on to the other activities
included in the module.
3. Read the instruction carefully before doing each task.
4. Observe honesty and integrity in doing the tasks and checking your
answers.
5. Finish the task at hand before proceeding to the next.
6. Return this module to your teacher/facilitator once you are through with it.
If you encounter any difficulty in answering the tasks in this module, do not
hesitate to consult your teacher or facilitator. Always bear in mind that you are
not alone.
We hope that through this material, you will experience meaningful learning
and gain deep understanding of the relevant competencies. You can do it!
Lesson
1
Computer Network Concepts
What I Need to Know
Hi guys, what’s up? did you know that in computer language networking is a
medium by which we can share All type of information. Connect people via network
and others Mode of Internet.
Setting-Up computer Network (SUCN) is divided into four learning outcomes;
✓ LO 1. Install Network cables - TLE_IACSS9- 12SUCN-IVa-j-33
➢ 1.1 Plan cable routes in accordance with network design and actual
installation site
After going through on this module, you should be able to:
▪ Define Computer network and Data Communication concepts;
▪ Recognize the uses, applications, and basic communication model
of the network.
What I Know
Hello! Are you excited for your first lesson? Let us see how much you know
about Computer Network Concepts.
General Directions: Read the instruction carefully and write your answer on a
separate sheet of paper.
Directions: Choose the letter of the correct answer.
1. Which one in computer network permits sharing?
a. Resources
b. Technology
c. Information
d. Communication
2. What set of rules which govern data communication?
a. sender
b. control
c. protocol
d. network
3. What do you call of information to be delivered?
a. sender
b. message
c. protocol
d. network
4. Which in Communication Model wherein the transmitted data is generated by
this device, such as telephones, personal computers, etc?
a. transmitter
b. source
c. receiver
d. protocol
5. What type of connection if a dedicated link connects two and only two devices?
a. multi-drop
b. point to point
c. link
d. cable
6. This type of communication model can be a single transmission line or a
complex network.
a. Transmitter
b. point to point
c. Transmission system
d. Transmission system protocol
7. What are the other terms of multi-drop configuration?
a. transmitter
b. point to point
c. transmission
d. multipoint
8. What better choice of the goal to make everyone available on the network
without regard to the physical location of the resource and the user?
a. resource sharing
b. source mapping
c. receiver mapping
d. communications
9. Which one is better among the choices if the goal that is starting to become
more critical in businesses is doing business with consumers over the
Internet?
a. Server-Client model
b. Client System model
c. E-commerce model
d. Server-Server model
10. What type of connection uses two or more devices to share a single link?
a. protocol
b. point to point
c. multi-drop
d. dedicated link
11.
It is defined as the time elapsed between inquiry and response. What type of
time is this?
a. Increase time
b. response time
c. link time
d. end-time
12.
It is the time taken to travel a message from one device to another. What
type of time is this?
a. Efficiency of software
b. Number of users
c. Capability of connected hardware
d. Increase time
13. This is another way to measure performance.
a. Data network
b. Game network
c. link network
d. Server network
14.
What type of topology if a network type in which every computer and
network device is connected to a single cable.
a.
b.
c.
d.
15. What
a.
b.
c.
d.
star
bus
mesh
ring
of connection if a dedicated link connects two and only two devices?
multi-drop
point to point
link to link
breakpoint
16. What type of topology in an office in one department ring topology has used
and in another star topology is used?
a. star
b. bus
c. mesh
d. hybrid
17. What kind of topology has a root node and all other nodes are connected to it
forming a hierarchy?
a. star
b. bus
c. mesh
d. tree
18. Virtually every company that has two or more computers now has e-mail
(electronic mail), which employees generally use for a great deal of daily
communication. What type of business applications of computer networks?
a.
b.
c.
d.
Resources
Information
Technology
Communication medium
19. A goal that is starting to become more critical in businesses is doing
business with consumers over the Internet. Airlines, bookstores and music
vendors have discovered that many customers like the convenience of
shopping from home. What type of business applications of computer
networks?
a.
b.
c.
d.
Resources
Information
E-commerce
Communication medium
20. In data communication data delivered should be accurate. What feature of
data communication?
a.
b.
c.
d.
Resources
Delivery
Timeliness
Accuracy
What’s In
Activity 1.1 TELL ME!
In your gadgets there are installed applications can you identify each application?
Can you tell its functions? Give at least 10 – applications.
Application
1
2.
3.
4
5.
6
7
8
9
Function
What’s New
How are you coping with our lesson? I hope you are curious about the activities we
will discuss in this module.
Direction: Read and study the situation carefully. Then answer the question based
on the scenario given.
Let’s assume that your Internet was working at an earlier point. Suddenly you can’t
access the website such as facebook.com you need to open and even you try to
open another web, but it came out the same result. How can you check a good
network?
Give the Properties of a Good Network.
1.
2.
3.
4
5
What is It
Introduction to Computer Networks
A computer network is a telecommunication channel using which we can share
data with other computers or devices, connected to the same network. It is also
called Data Network. The best example of a computer network is the Internet.
A node can be a device that is capable of sending or receiving data generated by
other nodes on the network like a computer, printer, etc. These links connecting
the devices are called Communication channels.
A network must be able to meet specific criteria’s; these are mentioned
below:
• Performance
• Reliability
• Scalability
Computer Networks: Performance
It can be measured in the following ways:
Transit time: It is the time taken to travel a message from one device to another.
Response time: It is defined as the time elapsed between inquiry and response.
Other ways to measure performance are:
1. Efficiency of software
2. Number of users
3. Capability of connected hardware
Computer Networks: Reliability
It decides the frequency at which network failure takes place. The more the
shortcomings are, the less is the network’s reliability.
Computer Networks: Security
It refers to the protection of data from any unauthorized user or access.
While traveling through a network, data passes many layers of a network, and data
can be traced if attempted. Hence security is also an essential characteristic for
Networks.
Properties of a Good Network
1. Interpersonal Communication: We can communicate with each other
efficiently and smoothly. Example: e-mails, chat rooms, video conferencing,
etc, all of these are possible because of computer networks.
2. Resources can be shared: We can share physical resources by making them
available on a network such as printers, scanners, etc.
3. Sharing files, data: Authorized users are allowed to share the files on the
network.
Basic Communication Model
A Communication model is used to exchange data between two parties.
Example communication between a computer, server, and telephone (through
MoDem).
4. Source - Data to be transmitted is generated by this device, for example:
telephones, personal computers, etc.
5. Transmitter - The data generated by the source system is not directly
transmitted in the form it created. The transmitter transforms and encodes
the data in such a way to produce electromagnetic waves or signals.
6. Transmission system can be a single transmission line or a complex
network connecting source and destination.
7. Receiver accepts the signal from the transmission system and converts it
into a form that is easily managed by the destination device.
8. Destination receives the incoming data from the receiver.
Data Communication
The exchange of data between two devices through a transmission medium is called
Data Communication.
Data Communication: Local
Local communication takes place when the communicating devices are in the same
geographical area, the same building, or face-to-face, etc.
Data Communication: Remote
Remote communication takes place over a distance i.e. the devices are farther. The
effectiveness of data communication can be measured through the following
features:
1. Delivery: Delivery should be done to the correct destination.
2. Timeliness: Delivery should be on time.
3. Accuracy: Data delivered should be accurate.
Components of Data Communication
1.
2.
3.
4.
Message: It is the information to be delivered.
Sender: Sender is the person who is sending the message.
Receiver: Receiver is the person to whom the message is being sent to.
Medium: It is the medium through which the message is sent. For example:
A Modem.
5. Protocol: These are some set of rules which govern data communication.
Following are some business applications of computer networks:
1. Resource Sharing:
The goal is to make all programs, equipment (like printers, etc), and especially
data, available to anyone on the network without regard to the physical location of
the resource and the user.
2. Server-Client model:
One can imagine a company’s information system consisting of one or more
databases and some employees who need to access it remotely. In this model, the
data is stored on powerful computers called Servers. Often these are centrally
housed and maintained by a system administrator. In contrast, the employees have
simple machines, called Clients, on their desks, using which they access remote
data.
3. Communication Medium:
A computer network can provide a powerful communication medium among
employees. Virtually every company that has two or more computers now has email (electronic mail), which employees generally use for a great deal of daily
communication
4. eCommerce:
A goal that is starting to become more critical in businesses is doing business with
consumers over the Internet. Airlines, bookstores, and music vendors have
discovered that many customers like the convenience of shopping from home. This
sector is expected to grow quickly in the future.
There are two ways to connect the devices :
Point-To-Point Connection
It is a protocol that is used as a
communication link between two
devices. It is simple to establish. The
most common example for Point-toPoint connection (PPP) is a computer
connected by telephone line. We can
connect the two devices using a pair
of wires or using a microwave or
satellite link.
Example: Point-to-Point connection
between the remote control and
Television for changing the channels.
MultiPoint Connection
It is also called a Multidrop
configuration. In this connection,
two or more devices share a single
link.
There are two kinds of Multipoint
Connections:
• If the links are used
simultaneously between many
devices, then it is a spatially
shared line configuration.
• If the user takes turns while
using the link, then it is timeshared (temporal) line
configuration.
Types of Network Topology
1. Bus topology is a network
type
in
which
every
computer
and
network
device is connected to a
single cable. When it has
exactly two endpoints, then
it is called Linear Bus
topology.
2. RING Topology is called
ring topology because it
forms a ring as each
computer is connected to
another computer, with the
last one connected to the
first. Exactly two neighbors
for each device.
3. STAR topology all the
computers are connected to
a single hub through a
cable. This hub is the
central node and all other
nodes are connected to the
central node.
4. MESH Topology is a pointto-point connection to other
nodes or devices. All the
network
nodes
are
connected.
5. TREE Topology has a root
node and all other nodes are
connected to it forming a
hierarchy. It is also called
hierarchical
topology.
It
should at least have three
levels to the hierarchy.
6. HYBRID topology is two
different types of topologies
which is a mixture of two or
more
topologies.
For
example, if in an office in
one
department
ring
topology is used and in
another star, topology is
used,
connecting
these
topologies will result in
Hybrid
Topology
(ring
topology and star topology).
What’s More
General Directions: Read the items very carefully. Write your answer in a
a clean sheet of paper.
Test I. True or False
Directions: Write TRUE if the statement is correct and FALSE if otherwise.
_______1. Person-to-person communication is not one of the most important uses of
the Internet for home users.
_______2. Performance is one of the criteria in computer networks.
_______3. Reliability decides the frequency at which network failure takes place.
_______4. In Communication Model Source Data to be transmitted is generated by
this device, such as telephones, personal computers, etc.
_______5. In Data Communication: Remote Delivery should not be done to the
correct destination.
What I Have Learned
Directions: Now that you’ve learned a lot from the very start of our module, let’s
summarize our lesson from the very start by filling the blanks with an appropriate
answer.
Fill in the Blank
1. It is a _______________ which is used as a communication link between two
devices.
2. __________________ is connection between remote control and Television for
changing
the
channels.
3. MultiPoint Connection It is also called ______________ configuration.
4._________________ topology is two different types of topologies which is a mixture
of
two
or
more
topologies..
5. A _______________ can be a device which is capable of sending or receiving data
generated by other nodes on the network like a computer, printer etc...
What I Can Do
Now, it’s about time for us to use our knowledge in real life situations. Let’s answer
the following questions below.
1. Your mother wants to transfer files from her smart phone to her new laptop.
What possible network connection can be used to do the job since both
devices capable to connect via wireless transmission. Explain your answer
and give the steps how smart phone connects to laptop.
2. Jerald wants to buy a new pair of shoes on the shopping mall but the size of
his shoes is no longer available. What possible business application you can
offer to him to buy the shoes? Why?
Assessment
Directions: Choose the letter of the correct answer. Use a separate sheet for your
answer.
1. Which of the choices defined when the time elapsed between inquiry and
response?
a. Increase time
b. response time
c. link time
d. thinking time
2. What type of topology when each computer forms like a circle and connected to
another computer, with the last one connected to the first?
a. bus
b. ring
c. star
d. mesh
3. What type of topology when each computer is connected via point-to-point
connection to other nodes and all network nodes are connected to each other
a. bus
b. ring
c. star
d. mesh
3. Which components of data communication means that the information is to be
delivered?
a. message
b. sender
c. receiver
d. medium
4. It is the person who is sending the message. What components of data
communication is this?
a. message
b. sender
c. receiver
d. medium
5. What type of connection if a dedicated link connects two and only two devices.
a. multi-drop
b. point to point
c. link
d. cable
6. This type of communication model can be a single transmission line or a
complex network.
a. Transmitter
b. point to point
c. Transmission system
d. Transmission system protocol
7. What
a.
b.
c.
d.
is other term of multi-drop configuration?
transmitter
point to point
transmission
multipoint
8. Which one is better among the choices if the goal is make available to
anyone on the network without regard to the physical location of the
resource and the user?
a. resource sharing
b. source mapping
c. receiver mapping
d. communications
9. Which one is better among the choices if the goal that is starting to become
more important in businesses is doing business with consumers over the
Internet?
a. Server-Client model
b. Client System model
c. E-commerce model
d. Server-Server model
10. What
a.
b.
c.
d.
type of connection uses two or more devices share a single link?
protocol
point to point
multi-drop
dedicated link
Test II. Match UP!
Direction: Match Column A with Column B.
A
1. It is a telecommunication channel using which we can
share data with other computers or devices, connected
to the same network.
B
a. Interpersonal
Communication
b. Security
2. It decides the frequency at which network failure take
place. More the shortcomings are, less is the network’s
reliability.
3. Properties of a good network, we can communicate with
each other efficiently and easily. Example: e-mails, chat
rooms, video conferencing etc, all of these are possible
because of computer networks.
c. message
d. Destination
e. Reliability
f. protocol
4. It refers to the protection of data from any unauthorized
user or access. While travelling through network, data
passes many layers of network, and data can be traced
if attempted. Hence security is also a very important
characteristic for Networks.
5. Properties of good network, an authorized user are
allowed to share the files on the network.
6. In communication model, it accepts the signal from the
transmission system and converts it into a form which
is easily managed by the destination device.
7. In communication model, this is the one who receives
the incoming data from the receiver.
8. In Components of Data Communication, Data to be
transmitted is generated by this device, example:
telephones, personal computers etc.
9. In Components of Data Communication, these are some
set of rules which govern data communication.
10. It can be a device which is capable of sending or
receiving data generated by other nodes on the network
like a computer, printer etc.
g. node
h. Sharing files and
data
i.
Receiver
j.
Computer Network
k. source
Additional Activities
Congratulations! You’ve come this far. I know you’ve learned a lot about the lesson.
Now for your additional activities, just answer the following questions.
1. In Computer Networks, among Business Applications, what is more useful to
you in terms of transferring files in your smartphone to another device?
2. What part of lesson did you find interesting or useful in your everyday lives?
What I
Know
1.C
2.C
What's More
1. Interpersonal
2. Resources can be
shared
3.B
What's More
1.
2.
3.
4.
5.
F
T
T
T
F
Assessme
nt
I.
1. A
2. A
3. D
4. B
5. A
6. C
7. .D
8. A
9. C
10. B
4.B
5.B
6.C
7.D
8.A
9.C
II
10.B
1. J
2. E
3. A
4. B
5. H
6. I
7. D
8. K
9. F
10. G
11.A
12.A
13.D
14.B
15.A
Answer Key
References
Learning Material
Online Resources:
•
2020 Studytonight.”Computer Network”: Introduction To Computer Networks.
https://www.studytonight.com/computer-networks/overview-ofcomputer-networks
DISCLAIMER
This Self-learning Module (SLM) was developed by DepEd SOCCSKSARGEN
with the primary objective of preparing for and addressing the new normal.
Contents of this module were based on DepEd’s Most Essential Learning
Competencies (MELC). This is a supplementary material to be used by all
learners of Region XII in all public schools beginning SY 2020-2021. The
process of LR development was observed in the production of this module.
This is version 1.0. We highly encourage feedback, comments, and
recommendations.
For inquiries or feedback, please write or call:
Department of Education – SOCCSKSARGEN
Learning Resource Management System (LRMS)
Regional Center, Brgy. Carpenter Hill, City of Koronadal
Telefax No.: (083) 2288825/ (083) 2281893
Email Address: region12@deped.gov.ph