Lightning SA MultiCom, Руководство пользователя

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Glossary User’s Manual 161
NetBIOS
Network Basic Input Output System is a set of basic network functions that can
be used on a LAN. Most frequently these ports are used by computers running
Microsoft Windows software.
The data is used to identify names of shared objects and other computers but due
to their frequency this data traffic may inadvertently open dial up connections. In
this case it may be useful to disable the spreading of this data past the MultiCom
Firewall.
Netmask
Also known as subnet mask, is a 32–bit number that separates the network and
host portions of an IP address. The form looks like an appendage to a device's IP
address such as 1.2.3.4/24 (meaning a 24–bit sized netmask for device 1.2.3.4) or
as an IP address x.x.x.x such as 255.255.255.0 (also a 24–bit sized netmask). It is
frequently used to divide a larger network into smaller, virtual networks.
Network
A group of computers connected together to share data. This group can be the
computers in your home or the computers in your office building as compared to
a remote network (WAN) that you may connect to through the phone company or
satellite uplinks.
Networks are typically differentiated by the media/ cabling connecting the
devices, the protocols being run over the media and the layout or topology of the
media.
Octet
An 8-bit number. This number is often in binary as 00001111 or decimal 15. The
range of numbers an octet can be is from 00000000–11111111 in binary or 0 –
255 in decimal form.
Packet
Also known as a datagram or frame is the envelope that data travels within over
your network. Each of these envelopes can have different identifying information
on them such as the source IP address, the destination IP address, error checking
information, sequence numbers and more. Additionally packets can be of
different sizes as well. Data that is too large to be fit into one packet of data will
be broken down into a series of packets before being sent across the network.