1. Understand the Local Area Networks (LANs)
LESSON 1.2_A
Networking Fundamentals
Understand the Local Area Networks (LANs)

2. Lesson Overview LANs Perimeter networks Addressing Local loopback IPs
In this lesson, you will learn about:
LANs
Perimeter networks
Addressing
Local loopback IPs
An Internet collection

3. Anticipatory Set: Class Activity
Two students draw a slip of paper from the box. Arrange yourselves in order at the front of the room. Two more students select numbers and add to the network forming.
The student with number 1: Tell a “secret” to number 2. Continue to pass information from one student to the next until the message reaches the end of the network.
When the last person receives the message, repeat it to the class.
Describe how this process is similar and different to a computer passing information throughout a network.
Preparation: On small pieces of paper write a number from 1 to the max number of students in the class and place in a box from which students can draw.

4. Just as people network and talk to each other and spread information, computers can network and talk to each other and share information.

5. LANs - Local Area Networks
Computer networks ranging in size from two computers in a home to a few computers in a single office to hundreds or even thousands of devices spread across several buildings.
They function to link computers together and provide shared access to printers, file servers, and other services.

6. A group of computers and other devices dispersed over a relatively limited area and connected by a communications link that enables any device to interact with any other on the network.
LANs commonly include PCs and shared resources such as laser printers and large hard disks.
The devices on a LAN are known as nodes (individual pieces of equipment.)
Nodes are connected by wireless and by cables and through which messages are transmitted

7. LANs in turn may be plugged into larger networks, such as larger LANs or wide area networks (WANs), connecting many computers within an organization to each other and/or to the Internet.
The physical media that connect devices, interfaces on the individual devices that connect to the media, protocols that transmit data across the network, and software that negotiates, interprets, and administers the network and its services are all a part of the LAN.

8. Perimeter Networks
A perimeter network is a specialized network. Usually a physical subnet outside of the main firewall allowing a business to expose their services to the Internet.
The points of what the student will learn must reflect the lesson objective.
Writer may choose to use a general “getting set to learn” activity

9. Addresses A unique identifier is assigned to each node on a network.
A computing address defines a range of discrete addresses:
each of which may correspond to a physical or virtual memory register
a network host
peripheral device, disk sector, or other physical entity.
Just as people have addresses, computer memory and networks have addresses.
The points of what the student will learn must reflect the lesson objective.
Writer may choose to use a general “getting set to learn” activity.

10. Reserved address ranges for local use
Address ranges are reserved by IANA for private intranets, and not routable to the Internet.
The Internet Assigned Numbers Authority (IANA)
Allocates ranges of numbers to various registries in order to enable them to each manage their particular address space.
The points of what the student will learn must reflect the lesson objective.
Use the guiding question as a class starter allowing the students time to answer the question in their journal or to discuss.

11. Local Loopback IPs 127.0.0.1 is the loopback address in IP
Loopback is a test mechanism of network adapters. Messages sent to do not get delivered to the network.
Instead, the adapter intercepts all loopback messages and returns them to the sending application.
IP applications often use this feature to test the behavior of their network interface.
Opportunity for a demo by the instructor to show how to PING the loopback address.

12. An Internet Connection Sharing
ICS is a collection of technologies that work together to enable multiple devices on a private network to share a single Internet connection.
Microsoft® uses the class C reserved IP range for implementing a SOHO (small office/home office) network—where one computer shares its Internet connection with other computers—similar to Microsoft's printer sharing noted in the video.

13. Lesson Review Complete this review activity on the same paper with the flow chart you used for the applied learning.
Summarize a local area network
Add any questions you have about the lesson
Turn in this paper as your “ticket out the door”
Make steps to the students clear and concise.

14. Class Activity Student activity 1.2_A: Local Area Network Components.
View the video shown on the next slide.
Using form SA 1.2_A label the components of the LAN created in the video.
Note to Instructor: this is a YouTube video that can be found here: However, there are some unseemly comments that you might not want your students to see. It would be best to show the video using this presentation and the following slide.

15. Note to Instructor: this is a YouTube video that can be found here: However, there are some unseemly comments that you might not want your students to see. It would be best to show the video using this presentation and the following slide.