3Com 3CBLSF50 User Guide - Page 104

Layer 2, Link Aggregation, MAC Address, Network, Power over Ethernet, Protocol, RJ-45

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104 GLOSSARY switches) that cover a relatively small geographic area (usually not larger than a floor or building). LANs are characterized by high transmission speeds over short distances (up to 1000 metres). Layer 2 Data Link layer in the ISO 7-Layer Data Communications Protocol. This is related directly to the hardware interface for the network devices and passes on traffic based on MAC addresses. Link Aggregation See Trunking. MAC Media Access Control. A protocol specified by the IEEE for determining which devices have access to a network at any one time. MAC Address Media Access Control Address. Also called the hardware, physical or Ethernet address. A layer 2 address associated with a particular network device. Most devices that connect to a LAN have a MAC address assigned to them as they are used to identify other devices in a network. MAC addresses are 6 bytes long. Network A Network is a collection of computers and other computer equipment that are connected for the purpose of exchanging information or sharing resources. Networks vary in size, some are within a single room, others span continents. Ping Packet Internet Groper. An Internet utility used to determine whether a particular IP address is online. It is used to test and debug a network by sending out a packet and waiting for a response. Power over Ethernet PoE technology describes a system to transmit electrical power, along with data, to remote devices over standard twisted-pair cable in an Ethernet network. This technology is useful for powering IP telephones, wireless LAN access points, network cameras, network hubs, embedded computers, and other appliances where it would be inconvenient, expensive or infeasible to supply power separately. It works with an unmodified Ethernet cabling infrastructure. Protocol A set of rules for communication between devices on a network. The rules dictate format, timing, sequencing and error control. RJ-45 A standard connector used to connect Ethernet networks. The "RJ" stands for "registered jack."

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104
G
LOSSARY
switches) that cover a relatively small geographic area
(usually not larger than a floor or building). LANs are
characterized by high transmission speeds over short
distances (up to 1000 metres).
Layer 2
Data Link layer in the ISO 7-Layer Data Communications
Protocol. This is related directly to the hardware
interface for the network devices and passes on traffic
based on MAC addresses.
Link Aggregation
See
Trunking.
MAC
Media Access Control.
A protocol specified by the IEEE
for determining which devices have access to a network
at any one time.
MAC Address
Media Access Control Address.
Also called the
hardware, physical or Ethernet address. A layer 2
address associated with a particular network device.
Most devices that connect to a LAN have a MAC
address assigned to them as they are used to identify
other devices in a network. MAC addresses are 6 bytes
long.
Network
A Network is a collection of computers and other
computer equipment that are connected for the
purpose of exchanging information or sharing resources.
Networks vary in size, some are within a single room,
others span continents.
Ping
P
acket
In
ternet
G
roper. An Internet utility used to
determine whether a particular IP address is online. It is
used to test and debug a network by sending out a
packet and waiting for a response.
Power over Ethernet
PoE technology describes a system to transmit electrical
power, along with data, to remote devices over standard
twisted-pair cable in an Ethernet network. This
technology is useful for powering IP telephones, wireless
LAN access points, network cameras, network hubs,
embedded computers, and other appliances where it
would be inconvenient, expensive or infeasible to supply
power separately. It works with an unmodified Ethernet
cabling infrastructure.
Protocol
A set of rules for communication between devices on a
network. The rules dictate format, timing, sequencing
and error control.
RJ-45
A standard connector used to connect Ethernet
networks. The "RJ" stands for "registered jack."