Gateway 7001 Series User Manual

Page 191

186

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Lease Time

The Lease Time specifies the period of time the

DHCP

Server gives its clients an

IP Address

and other required information. When the lease expires, the client must request a new
lease. If the lease is set to a short span, you can update your network information and
propagate the information provided to the clients in a timely manner.

LLC

The Logical Link Control (LLC) layer controls frame synchronization, flow control, and error
checking. It is a higher level protocol over the

PHY

layer, working in conjunction with

the

MAC

layer.

MAC

The Media Access Control (MAC) layer handles moving data packets between

NIC

s across

a shared channel. It is a higher level protocol over the

PHY

layer. It provides an arbitration

mechanism in an attempt to prevent signals from colliding.

It uses a hardware address, known as the MAC address, that uniquely identifies each node
of a network.

IEEE 802 network devices share a common 48-bit MAC address format, displayed as a string
of twelve (12) hexadecimal digits separated by colons, for example FE:DC:BA:09:87:65.

MSCHAP V2

Microsoft Challenge Handshake Authentication Protocol Version 2 (MSCHAP V2) provides
authentication for

PPP

connections between a Windows-based computer and an

Access

Point

or other network access device.

MTU

The Maximum Transmission Unit is the largest physical packet size, measured in bytes, that
a network can transmit. Any messages larger than the MTU are fragmented into smaller
packets before being sent.

Multicast

A Multicast sends the same message to a select group of recipients. Sending an e-mail
message to a mailing list is an example of multicasting. In wireless networks, multicast
usually refers to an interaction in which the access point sends data traffic in the form of

IEEE 802.1x Frame

s to a specified set of client stations (

MAC

addresses) on the network.

Some wireless security modes distinguish between how unicast, multicast, and broadcast
frames are encrypted or whether they are encrypted.