Dell PowerConnect 5500 Series System User's Manual page 714

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Layer 2
Data Link Layer or MAC Layer
. Contains the physical address of a client or
server station. Layer 2 processing is faster than Layer 3 processing because
there is less information to process.
Layer 3
Establishes a connections and ensures that all data arrives to their
destination. Packets inspected at the Layer 3 level are analyzed and
forwarding decisions, based on their applications.
LLDP-MED
Link Layer Discovery Protocol - Media Endpoint Discovery.
LLDP allows
network managers to troubleshoot and enhance network management by
discovering and maintaining network topologies over multi-vendor
environments. MED increases network flexibility by allowing different IP
systems to co-exist on a single network LLDP .
Load Balancing
Enables the even distribution of data or processing packets across available
network resources. For example, load balancing may distribute the incoming
packets evenly to all servers, or redirect the packets to the next available
server.
M
MAC Address
Media Access Control Address
. The MAC Address is a hardware specific
address that identifies each network node.
MAC Address Learning
MAC Address Learning characterizes a learning bridge, in which the packet's
source MAC address is recorded. Packets destined for that address are
forwarded only to the bridge interface on which that address is located.
Packets addressed to unknown addresses are forwarded to every bridge
interface. MAC Address Learning minimizes traffic on the attached LANs.
MAC Layer
Data Link Control
A sub-layer of the (DTL) layer.
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Dell PowerConnect 55xx Systems User Guide