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Networking Basics

OSI Reference Model

Introduction to TCP/IP

LAN Basics

Understanding Switching

WAN Basics

Understanding Routing

What Is Layer 3 Switching?

Understanding Virtual LANs

Understanding Quality of Service

Security Basics

Understanding Virtual Private Networks (VPN)

Voice Technology Basics

Network Management Basics

The Internet




LAN Basics

Ethernet Reliability

Ethernet is known as being a very reliable local area networking protocol. In this example, A is transmitting information and B also has information to transmit. Let’s say that A & B listen to the network, hear no traffic and broadcast at the same time. A collision occurs when these two packets crash into one another on the network. Both transmissions are corrupted and unusable.

When a collision occurs on the network, the NIC card sensing the collision, in this case, station C sends out a jam signal that jams the entire network for a designated amount of time.

Once the jam signal has been received and recognized by all of the stations on the network, stations A and D will both back off for different amounts of time before they try to retransmit. This type of technology is known as Carrier Sense Multiple Access With Collision Detection – CSMA/CD.

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