CCNA Exam Tutorial: MAC Addressing Formats And Broadcasts

His review CCNA success depends on their mastery of networking, routing, switching and foundations. These foundations must include knowledge of MAC addresses, so let& 39;s look at the media access control address.

A typical MAC address looks like this:

af-14-b3-c2-14-45

You will wonder why we have letters and numbers in this direction. MAC expressed in hex, which gives us the ability to express values with the same number of bits. In theory, each of NIC in the world must have a unique MAC address completely, and the only way to do that is to express MAC address in hex.

MAC addresses are actually composed of two parts, so we will have another area in which I showed you before.

af-14-b3-c2-14-45

The first half of this direction (af-14-b3) is the unique identifier on documents of the organization. This particular OUI belonging to a single supplier, so it& 39;s only organization " ". The second half of the leadership is a combination of hexadecimal characters that the manufacturer has not used before with this particular OUI, sometimes called the Device ID.

Breaking down in the example of its two parts:

af-14-b3 is the OUI

c2-14-45 is the Device ID

In Thus, the MAC address must be unique in any other direction MAC Existence. (Using hex means that we have 281474976710656 possible combinations.)

Note the highest hexadecimal value is f. If all values in a MAC address establishing af, which is the broadcast address MAC. To express the hexadecimal value in any case does not change the value, so that both of the following are the same direction.

Watch for any MAC address that contains a letter that comes after " F " in the alphabet - which is an invalid address. For example, both of the following MAC addresses are not valid.

11-22-33-44-55-hf
Rf-12-34-45-56-67

MAC addresses can be expressed with scripts, as we have seen so far in this chapter or two points. They can also be expressed in a format similar to the IP addresses. To illustrate, all of the following MAC addresses are the same direction and are valid all forms of expression of a MAC address.

aa-bb-cc-dd-ee-34
aa: bb: cc: dd: ee: 34
aabb.ccdd.ee34

While we spend most of our time working with IP addresses, the data can not be transmitted from one point to another without the right MAC addresses. On the morning of the examination CCNA tutorial, we will see how to construct a changing table MAC addresses and actions can have a switch that handles frames. See you then woodrow mignon



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