NetQue

• VLAN is Layer - 2 technology which works closely on Ethernet.
• IEEE802.3ab standardizes Giga-Ethernet over UTP using Cat-5, Cat- 5e and Cat-6 cables.
• LAN uses Ethernet which in turn works on shared media.
• Host in one VLAN cannot speak to a host in another.
• Ethernet connector is network interface card equipped with 48-bits MAC address.
• Ethernet follows Star topology with segment length up to 100 meters.
• Ethernet uses Carrier Sense Multi Access/Collision Detection (CSMA/CD) technology to detect collisions.
• Fast Ethernet uses CSMA/CD technique for wired media sharing among the Ethernet hosts and CSMA/CA (CA stands for Collision Avoidance) technique for wireless Ethernet LAN.
• 10BASE-T Ethernet provides transmission speed up to 10MBPS and uses coaxial cable or Cat-5 twisted pair cable with RJ-5 connector.
• Fast-Ethernet is an extension of Ethernet to encompass the need of fast emerging software and hardware technologies.
• Traditional Ethernet uses 10BASE-T specifications.
• The number 10 depicts 10MBPS speed, BASE stands for baseband, and T stands for Thick Ethernet.
• To route packets between two different VLANs, a Layer - 3 device such as Router is required.
• On the occurrence of collision in Ethernet, all its hosts roll back, wait for some random amount of time, and then re-transmit the data.
• Ethernet over fiber can be extended up to 100 meters in half-duplex mode and can reach maximum of 2000 meters in full-duplex over multimode fibers.
• Hosts in one VLAN, even if connected on the same Switch cannot see or speak to other hosts in different VLANs.
• Fast Ethernet provides speed up to 100MBPS.
• By default, all hosts are placed into the same VLAN.
• Fast-Ethernet can run on UTP, Optical Fiber, and wirelessly too.
• Introduction of switches to Ethernet has removed single collision domain issue and each device connected to switch works in its separate collision domain.
• Giga-Ethernet provides speed up to 1000 mbits/seconds.
• The standard for Fast Ethernet is 100BASE-T in IEEE 803.2 using Cat-5 twisted pair cable.
• IEEE802.3ah defines Giga-Ethernet over Fiber.
• Fast Ethernet on fiber is defined under 100BASE-FX standard which provides speed up to 100MBPS on fiber.