telecommunications training, dvd video courses, online telecom course, IP networking and MPLS training, VoIP fundamentals, books, certification
 

Teracom Tutorial: LAN

Go to Teracom home page scheduled public seminars, instructor-led telecom training, networking training, telecommunications training, VoIP training, MPLS training courses self-paced DVD video courses telecom, datacom, networking, IP, MPLS, wireless, training, learning, courses, online online certification and testing info on bringing any Teracom seminar to your location for a private team training session telecommunications training book, networking book Free online tutorials (graphic/text and VideoTutorials), plus knowledge evaluation quizzes, archived newsletter articles and more!
site map
 QUICK LINKS
Register for Certification
Register: Online Courses
Register for a Seminar
Order DVDs
Order Books
Certification Exams
Online Course Previews
Video Previews
Newsletter
CPE Credits
Specials
free bonuses - certification and online courses
 LEARNING YOUR WAY
Online Courses
Certification
Instructor-Led Courses
Private Onsite Training
DVD-Video Courses
Reference Books
Free Tutorials
 TERACOM
Why take our courses
Who will benefit
Value pricing
Reviews
Instructors
About Teracom
Contact us
Policies and FAQs
be notified of new tutorials, seminars, video releases and more
Teracom Tutorial: LAN

Technologies for connecting computers within a building are called LANs.

Local Area Networks (LANs) are a way of implementing multidrop or multipoint data circuits within an office. LANs started to become popular in 1980, and have now become the standard method of implementing circuits to connect equipment. 
One of the original requirements for a LAN was to connect computers in an office to a shared laser printer.  This requirement has generalized to connectivity between devices and the sharing of resources, including hardware resources such as hard disks and surveillance cameras; information resources such as centralized databases; software resources such as network address configuration programs; communication resources such as WAN circuits and other resources.
Ethernet Switches, a.k.a. Layer 2 or LAN switches, creating broadcast domains with hardware; and VLANs, defining broadcast domains in software, are now the basis for the core of the telecom network: the backbone is now Optical Ethernet, no longer SONET and ATM.
The same Optical Ethernet technology is used for 10 Mb/s to 150 Mb/s fiber to the home or small office, and 40 Gigabit service to large office buildings.
 

The original design for a LAN used a bus topology and coaxial cable.

Topology is the way the system looks viewed from the top, its layout. 

Bus comes from electrical power distribution systems: a power distribution bus is a thick bar conducting electricity, for example, the bar in a circuit breaker panel to which all of the circuit breakers are attached. 

In LAN terminology, this term was borrowed to mean a cable running down an office building hallway connecting a floor full of PCs.  As illustrated in the graphic, all of the PCs, or workstations, terminals, devices or simply stations were connected to the bus. 

The bus implemented a multi-drop broadcast circuit: stations transmit on the bus and all stations listen to the bus; anything any station transmits is received by all of the other stations.
For this reason, the LAN is said to form a broadcast domain: any station has the possibility of communicating directly with any other in the broadcast domain without the need of other equipment or protocols.

The bus was replaced by a passive hub, which was then replaced with a switching hub, Layer 2 switch, Ethernet switch, or simply switch.
 
All of this is covered in detail in Chapter 11 of our famous instructor-led Course 101: Telecom, Datacom and Networking for Non-Engineers. We examine Ethernet and how it evolved into 10BASE-T, 100BASE-T and Gig-E, cable categories, switches and VLANs... in plain English.
This topic is also covered in detail in Online Course 2211 "Ethernet, LANs and VLANs".
Free lessons on LANs and on LAN cable categories are on the online courses previews page.
online telecom training courses
online courses
telecommunications certification
certification
instructor-led course 101: telecom, datacom and networking for non-engineering professionals
instructor-led
seminars
textbooks, reference books, certification study guides
books
DVD video courses
DVD-video courses
boot camp
mind the gap!
tell a friend:
Join our satisfied customers including:
at&t verizon bell canada microsoft intel cisco gsa cox cable
 
Copyright © Teracom Training Institute.   All rights reserved.    privacy policy    contact us    FAQs, help and policies