Data network communication

1.  1. How did you find the game? What did you observe?
 2. What are the idea or concept you can relate from your activity in our
topic (networking)?
 3. Why do we need to pass the message speedily?

2. Objectives:
 define computer network;
 perform basic concept network and network topology;
and
 appreciate the importance of networking.


3. 1.2 Networks
Network – is a set of devices (often referred to as nodes)
connected by communication links. A node can be a
computer, printer, or any other devices capable of
sending and/or receiving data generated by other nodes
on the network
Distributed processing – in which a task is divided among
multiple computers

4. Network Criteria – must be able to meet a certain number
of criteria: performance, reliability, and security
Performance – can be measured in many ways, including
transit time and response time
Reliability – in addition to accuracy of delivery, is measured
by frequency of failure, the time it takes a link to
recover from a failure, and the network’s robustness in
a catastrophe
Security – issues include protecting data from unauthorized
access

5. Physical Structure
Types of Connection
Network – is two or more devices connected together
through links
Link – is a communication pathway that transfers data from
one device to another
Point -to-Point – connection provides a dedicated link
between two devices. The entire capacity of the link is
reserved for transmission between those two devices
-use an actual length of wire or cable to connect the two
ends, but other options such as microwave or satellite
links are also possible

7. Multipoint (multidrop) – connection is one in which more than two specific
devices share a single link
- Capacity of the channel is shared, either spatially or teporally

8. Physical topology – refers to the way in which a network is laid out
physically
- Topology of a network is a geometric representation of the relationship
of all the links and the linking devices to one another

9. Ring Star
Mesh Bus

10. Mesh topology – every device has a dedicated point-to-
point link to every other device
Advantages:
- The use of dedicated links guarantees that each
connection can carry its own data load, thus elimination
the traffic problems that occur when links must be
shared by multiple devices
- Robust
- Privacy or security
- Easy fault identification and fault isolation

11. Disadvantages:
- Installation and reconnection are difficult
- Requires a big a mount of cabling and number of I/O
ports
- Requires greater space (walls, ceilings, or floors)
- Expensive

13. Star topology – each devices has a dedicated point-to-point link only to a
central controller, usually called a hub
Advantages:
-less expensive than mesh topology
-easy to install and reconfigure
-Less cabling needs to be housed
- Robust
- Easy fault identification and fault isolation
Disadvantage:
- Requires more cabling than in some other topologies (such as ring or bus)

15. Bus topology – is a multipoint connection. One long cable
acts as a backbone to link all the devices in a network
-nodes are connected to the bus cable by drop lines and
taps
Drop line – is a connection running between the device and
the main cable
Tap – is a connector that either splices into the main cable
or punctures the sheathing of a cable to create a
contact with the metallic core

16. Advantages:
-ease of installation
-Uses less cabling than mesh or star topologies
Disadvantages:
-Difficult reconnection and fault isolation
-difficult to add new devices
-signal reflection at the taps can cause degradation in
quality
- Fault or break in the bus cable stops all transmission

18. Ring topology – each device has a dedicated point-to-point
connection only with the two devices on either side of it
Advantages:
-easy to install and reconfigure
-fault isolation is simplified
Disadvantage:
- A break in the ring can disable the entire network

20. IV ASSESSMENT
The students will create star topology to connect five computer(s)
using packet tracer. Apply the class c IP address in every computer
with the network address (192.168.1.0).
Present your lab works or output. It will be evaluate through Rubrics.
.
Criteria Percentage
Mastery 60 %
• Correct Topology
• Correct Cable connection
• Time
Functionality 40 %
Total: 100%

21.  V. ASSIGNMENT

 Research the following: Notebook
 1. Categories of networks
 2. Cite an example of its network