Communication Management Level

Communication Management Level

How important is the communication management level? What is the purpose of this level? These are the questions we will tackle.

What Is A Communication Management Level?

The communication management level is often to referred to as the CM level. It is the lowest level in the OSI model.

This level is responsible for Media Access Control (MAC) and Logical Link Control (LLC). This includes the following:

  • Input/Output (I/O)
  • Formats of frames, protocols, and packet structure
  • Networking topology and how it works with LLC and MAC

The communication management level is responsible for input/output. Such as the formats of frames, protocols, and packet structure. 

It also includes networking topology and how it works with LLC and MAC.

OSI Model Link Layer

The OSI model is divided into two sublayers in the link layer. These are the Media Access Control (MAC) and Logical Link Control (LLC).

Media Access Control (MAC) 

The Media access control level is responsible for the following:

  • It controls the flow of network traffic on a physical network. This can be on a local area network (LAN) or a wide area network (WAN). 

So the MAC address is used to identify an individual node on a network. Moreover, the MAC address is composed of 2 pairs of hexadecimal numbers separated by colons. 

They represent the manufacturer who made the hardware and also the manufacturer’s serial number for that hardware. The MAC address is unique for each device. 

So this allows nodes to be uniquely identified by their MAC addresses. This ensures that only one node can be connected to a particular physical cable at any given time. 

It also ensures security on a single medium LAN or WAN.

  • It controls the transmission of data from one node to another node on the same network segment. Also, it does this by providing identification and addressing of data packets.

Coming from other nodes on the same network at Layer 2 of the OSI model. This ensures a node can receive data from other nodes on the network. 

This keeps track of the order of data coming from other nodes on the network. This is done by first checking for the destination MAC address in a table. 

Once that is identified, then it checks for a MAC address already assigned to that destination IP address. If there is no MAC address, then the data is sent to the destination node. 

How Important Is This?

The data sent to the destination node is checked for errors. This is done by using a cyclic redundancy check. 

This ensures that data was not corrupted in the transmission from another node. If there are errors, then the data is present by using the same process. 

If there are no errors, then the data will be accepted on the destination node. This ensures that only one node can be connected to a particular physical cable at any given time.

So with this, one can see how important it is to have a communication management level. Data will not be lost or sent to the wrong destination if there is no communication management level. 

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