User:Gchalla/sandbox

My topics
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Layer2 testing: -- ''Links are provided for each topic. Some are internal and others are external links to Wikipedia''

1. TCP/IP stack Internet_protocol_suite--Gchalla (talk) 10:11, 24 January 2013 (UTC)

2. TCP/UDP

3. ARP

4. ICMP

5. IP addressing

6. CIDR and VLSM

7. VLAN

8. STP

9. RSTP

10. LAG

11. LACP

12. Flow control

13. Autonegotiation

-- Ethernet--Gchalla (talk) 04:29, 28 January 2013 (UTC) --  Ethernet is a frame based computer technology for Local Area Network(LAN)s. It is standardized as IEEE 802.3. It is originally based on computers communicating over a shared co-axial medium which acts as broadcast medium.

A scheme called CSMA/CD i.e Carrier Sense Media Access with Collision Detection is implemented which governs the way the computers sharing the channel.

First the transmiting device senses the channel before transmitting the data. Then it will send the data. In this only one device can transmit at a time over the channel. If any other device tries to send the data then the collision occurs in the channel and then the transmitting device will send a JAM signal to all devices connected to the channel which is meant that there is a collision occured and to notify the receivers to drop the frame and mark it as a collision. The collision is what triggers the backoff timer on the transmitter. After 16 tries (The transmitting device will try to send the data), the frame is dropped.

-- Auto Negotiation --  Autonegotiation is an Ethernet procedure by which two connected devices choose common transmission parameters, such as speed, duplex mode, and flow control.

Link(s): Autonegotiation