The Data Link layer deals with issues on a single segment of the network...

IEEE 802.x series - standards were adopted by ANSI (American National Standards Institute), and then later revised by the ISO.

IEEE 802.2 defines the Logical Link Control (LLC) standard that performs functions in the upper portion of the Data Link layer, such as flow control and management of connection errors.

IEEE 802.3 is an extension of the original Ethernet. includes modifications to the classic Ethernet data-packet structure. IEEE802.3 spans the Physical and Data Link MAC layers, whereas Ethernet spans from the Physical layer through the entire Data Link layer.

Ethernet -

Competition for resources. The term is used especially in networks to describe the situation where two or more nodes attempt to transmit a message across the same wire at the same time.

A type of network protocol that allows nodes to contend for network access. That is, two or more nodes may try to send messages across the network simultaneously. The contention protocol defines what happens when this occurs. The most widely used contention protocol is CSMA/CD, used by Ethernet. CSMA/CD is a type of contention protocol.

Carrier Sense Multiple Access / Collision Detection is a set of rules determining how network devices respond when two devices attempt to use a data channel simultaneously (called a collision). Standard Ethernet networks use CSMA/CD. This standard enables devices to detect a collision.

After detecting a collision, a device waits a random delay time and then attempts to re-transmit the message. If the device detects a collision again, it waits twice as long to try to re-transmit the message. This is known as exponential back off.

IEEE 802.5 uses token passing to control access to the medium. IBM Token Ring is essentially a subset of IEEE 802.5.

The IEEE 802.11 specifications are wireless standards that specify an "over-the-air" interface between a wireless client and a base station or access point, as well as among wireless clients. The 802.11 standards can be compared to the IEEE 802.3™ standard for Ethernet for wired LANs. The IEEE 802.11 specifications address both the Physical (PHY) and Media Access Control (MAC) layers and are tailored to resolve compatibility issues between manufacturers of Wireless LAN equipment

The IEEE 802.15 Working Group provides, in the IEEE 802 family, standards for low-complexity and low-power consumption wireless connectivity.

IEEE 802.16 specifications support the development of fixed broadband wireless access systems to enable rapid worldwide deployment of innovative, cost-effective and interoperable multi-vendor broadband wireless access products.

For more information on Networking Basics, the OSI Model and Server Administration:
Back to the Section Index

If you have used this section as a reference, please be aware that many pages have been updated, and some content of the individual pages has changed to better find the information.

For more information on E- Commerce Check out: Questy.com/zen

DISCLAIMER: Technology changes very rapidly. The information presented here as a study guide to illustrate concepts. No claim is made that this information is up to date, or that it represents the current technology used today.

This area is meant to be a study guide, not a comprehensive reference.
Support our website, and get the reference book you need, use this link to find all your tech book needs:
Check out our recommended reading list.

Welcome to the World of Questy

Welcome to the World of Questy -- The World of Questy Sites are currrently undergoing a major overhaul. Stay tuned for updated links and news in 2008!

Unless otherwise credited all photos and graphics are the copyrighted property of Questy aka Tom Peracchio. Unauthorized reproduction of any of the pages of this web site is illegal, not to mention rude.
- Copyright 1990 through 2008 -