#What is the media access layer for a mac mac#
For information on configuring authentication servers and server groups, see Chapter 8, “Authentication Servers”Ĭonfiguring the MAC Authentication Profile See “Configuring Clients” for information on configuring the clients on the local database. The internal database can be used to configure the clients for MAC-based authentication. If derivation rules exist or if the client configuration in the internal database has a role assignment, these values take precedence over the default user role.Īuthentication server group that thecontrolleruses to validate the clients. You configure the default user role for MAC-based authentication in the AAA profile. (See Chapter 10, “Roles and Policies” for information on firewall policies to configure roles). The user role that will be assigned as the default role for the MAC-based authenticated clients. This chapter describes the following topics:īefore configuring MAC-based authentication, you must configure : MAC-based authentication can also be used to authenticate Wi-Fi phones as an additional layer of security to prevent other devices from accessing the voice network using what is normally an insecure SSID. Clients may be required to authenticate themselves using other methods depending on the network privileges required. For example, if clients are allowed access to the network via station A, then one method of authenticating station A is MAC-based. MAC-based authentication is often used to authenticate and allow network access through certain devices while denying access to the rest. While not the most secure and scalable method, MAC-based authentication implicitly provides an addition layer of security authentication devices. Use MAC-based authentication to authenticate devices based on their physical media access control (MAC) address.
#What is the media access layer for a mac how to#
When receiving data from the physical layer, the MAC block ensures data integrity by verifying the sender's frame check sequences, and strips off the sender's preamble and padding before passing the data up to the higher layers.This chapter describes how to configure MAC-based authentication on the Arubacontrollerusing the WebUI. Additionally, the MAC is also responsible for compensating for collisions by initiating retransmission if a jam signal is detected. For topologies with a collision domain (bus, ring, mesh, point-to-multipoint topologies), controlling when data is sent and when to wait is necessary to avoid collisions. the MAC adds a syncword preamble and also padding if necessary), adds a frame check sequence to identify transmission errors, and then forwards the data to the physical layer as soon as the appropriate channel access method permits it. When sending data to another device on the network, the MAC sublayer encapsulates higher-level frames into frames appropriate for the transmission medium (i.e. Although the MAC block is today typically integrated with the PHY within the same device package, historically any MAC could be used with any PHY, independent of the transmission medium. In turn, the medium access control block is formally connected to the PHY via a media-independent interface. Thus any LLC sublayer (and higher layers) may be used with any MAC. Within the hierarchy of the OSI model and IEEE 802 standards, the MAC sublayer provides a control abstraction of the physical layer such that the complexities of physical link control are invisible to the LLC and upper layers of the network stack. For compatibility reasons, LLC is optional for implementations of IEEE 802.3 (the frames are then "raw"), but compulsory for implementations of other IEEE 802 physical layer standards. These two sublayers together correspond to layer 2 of the OSI model. EtherType, 802.1Q VLAN tag etc), while the MAC provides flow control and multiplexing for the transmission medium.
Within the data link layer, the LLC provides flow control and multiplexing for the logical link (i.e. The MAC sublayer and the logical link control (LLC) sublayer together make up the data link layer. In IEEE 802 LAN/MAN standards, the medium access control ( MAC, also called "media access protocol" ) sublayer is the layer that controls the hardware responsible for interaction with the wired, optical or wireless transmission medium.
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