metrotek Bercut-MMT, Operation Manual

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80 Glossary
information source. Line starts with the type of protocol used (for
example, http://), followed by the source identification.
VLAN:
Virtual Local Area Network . A group of network devices that func-
tion as if they are connected to the same network segment.
VLAN ID:
VLAN Identifier (VID). A 12-bit VLAN identifier, defined in the
802.1Q standard. Uniquely identifies VLAN a frame belongs to.
VLAN Priority :
Three bits that carry information about frame priority. According
to IEEE 802.3p, eight priority values are possible.
Link Layer :
Provides for network communication at physical level and error mon-
itoring that may occur. Data link layer can communicate with one
or several physical layers, monitors and controls this communication.
TCP/IP protocols family :
An official name of TCP/IP protocols group.
Network switch :
A device used for interconnection of several nodes of computer net-
work. Sends data directly to recipient.
Network hub :
A device used for joining of several nodes of computer network. All
devices connected to the hub ports receive same information.
Network Layer :
Provides for route determination for data transmission. Is responsi-
ble for logical to physical addresses and names mapping, for shortest
routes determination, for switching and routing, network faults mon-
itoring.
Transport Layer :
Ensures reliable transporting of packets between two network end
points. Despite lower layer protocols check correctness of each data
transmission operation, the task of this layer is to additionally check
correctness of data being transmitted.
Physical network :
In this manual, physical network is treated as a network that contains
devices working at data link layer, such as network switch.
Physical layer :
Its task is to directly transmit data flow. Transmits optical or elec-
trical signals to the cable and receives them and converts into data
bits according to coding methods of digital signals.
Bercut-MMT: Ethernet Networks Analysis