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Alex George
Alex George has Engineering graduation in Computer Science and an MBA in Finance. He had been working as a senior Network Engineer for ten years. His specialization is in Cisco products. Traveling is one of his hobbies and visited various places as part of his onsite work. He visited different places as part of his onsite work like New York, Dubai, London, etc. Right now Alex is a director of one of the leading career development firms in India, which trains students for UPSC, SSC, and PSC examinations. He guides a lot of students to get selection for various prestigious institutions like CBI, Income Tax Department, etc. Alex George is a stock market investor and a very active intraday trader. Engineering Background: He has a B.Tech in Computer Science and Engineering and passed different network and security courses like CCNA, CCNP (Security), CEH, and various Microsoft certifications. Finance Background: Alex has an MBA in Finance. He is an active intraday trader and a Share Market Investor. Webmaster Skills: Alex is a blogger since 2004. He has a working knowledge of HTML, CSS, PHP, and JavaScrip.

Data Link Layer Provide Physical Addresses

The second layer in the OSI Reference model is the Data Link Layer. The data link layer is responsible for providing physical addresses for the devices connected to the network. The physical address is also called hardware address because it is built-in address (not a logical address like IP address). The data link layer is responsible for taking bits from the Physical layer and convert them to frames. All communications done in Data link layer is in the form of frames.


Sub division in Data-link Layer

In IEEE version of Ethernet, Data link layer is subdivided in to:

1. Logical Link Control (LLC)
2. Media Access Control (MAC)

Data-link Layer devices

Networking devices functioning at Data link layer are:

  1. Switch
  2. NIC
  3. Bridge

Responsibilities of Data Link Layer
  1. Define Physical Addresses
  2. Communication in the same network in form of Frames
  3. Define hardware topology of the network

Major Data Link layer Protocols

  1. CIF : Cells in Frames Ethernet
  2. FDDI : Fiber Distributed Data Interface
  3. GARP : Generic Attribute Registration Protocol
  4. GMRP : Multicast Registration Protocol.
  5. GVRP :GARP VLAN Registration Protocol
  6. LLC :Logical Link Control.
  7. SNAP :SubNetwork Access Protocol

Seven Layer Structure

The seven layer structure of the OSI Reference Model is listed below.
  1. Physical layer

  2. Data link layer

  3. Network layer

  4. Transport layer

  5. Session layer

  6. Presentation layer

  7. Application layer
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Comments

Alex George said…
In data link layer data is in the format of frames.

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