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Glossary
48-Port 10/100 + 4-Port Gigabit Switch with WebView and Power over Ethernet
Appendix B
CoS (Class of Service) - The 802.1p priority scheme.
CoS provides a method for tagging packets with priority
information. A CoS value between 0-7 is added to the
Layer II header of packets, where zero is the lowest priority
and seven is the highest.
DDNS (Dynamic Domain Name System) - Allows the
hosting of a website, FTP server, or e-mail server with a
fixed domain name (e.g., www.xyz.com) and a dynamic IP
address.
Default Gateway - A device that forwards Internet traffic
from your local area network.
DHCP (Dynamic Host Configuration Protocol) - A
networking protocol that allows administrators to assign
temporary IP addresses to network computers by “leasing”
an IP address to a user for a limited amount of time, instead
of assigning permanent IP addresses.
DHCP Clients - An Internet host using DHCP to obtain
configuration parameters, such as a network address.
DHCP Server - An Internet host that returns configuration
parameters to DHCP clients.
DNS (Domain Name Server) - The IP address of your
ISP’s server, which translates the names of websites into
IP addresses.
Domain - A specific name for a network of computers.
Download - To receive a file transmitted over a network.
DSL (Digital Subscriber Line) - An always-on broadband
connection over traditional phone lines.
DSCP (DiffServ Code Point) - Provides a method of
tagging IP packets with QoS priority information.
Dynamic IP Address - A temporary IP address assigned
by a DHCP server.
EIGRP (Enhanced Interior Gateway Routing Protocol)
- Provides fast convergence, support for variable-length
subnet mask, and supports multiple network layer
protocols.
Encryption - Encoding data transmitted in a network.
Ethernet - IEEE standard network protocol that specifies
how data is placed on and retrieved from a common
transmission medium.
Firmware - The programming code that runs a networking
device.
Flow Control - Enables lower speed devices to
communicate with higher speed devices. This is
implemented by the higher speed device refraining from
sending packets.
FTP (File Transfer Protocol) - A protocol used to transfer
files over a TCP/IP network.
Full Duplex - The ability of a networking device to receive
and transmit data simultaneously.
GARP (General Attributes Registration Protocol) -
Registers client stations into a multicast domain.
Gateway - A device that interconnects networks with
different, incompatible communications protocols.
GBIC (GigaBit Interface Converter) - A hardware module
used to attach network devices to fiber-based transmission
systems. GBIC converts the serial electrical signals to serial
optical signals and vice versa.
GVRP (GARP VLAN Registration Protocol) - Registers
client stations into a VLANs.
Half Duplex - Data transmission that can occur in two
directions over a single line, but only one direction at a
time.
HTTP (HyperText Transport Protocol) - The
communications protocol used to connect to servers on
the World Wide Web.
HTTPS (HyperText Transport Protocol Secure) - An
extension to the standard HTTP protocol that provides
confidentiality by encrypting the traffic from the website.
By default this protocol uses TCP port 443.
ICMP (Internet Control Message Protocol) - Allows the
gateway or destination host to communicate with the
source host. For example, to report a processing error.
IGMP (Internet Group Management Protocol) - Allows
hosts to notify their local switch or router that they want
to receive transmissions assigned to a specific multicast
group.
IP (Internet Protocol) - A protocol used to send data over
a network.
IP Address - The address used to identify a computer or
device on a network.
IPCONFIG - A Windows 2000 and XP utility that displays
the IP address for a particular networking device.
IPSec (Internet Protocol Security) - A VPN protocol used
to implement secure exchange of packets at the IP layer.
ISP (Internet Service Provider) - A company that provides
access to the Internet.
Jumbo Frames - Enable transporting identical data in
fewer frames. Jumbo Frames reduce overhead, lower
processing time, and ensure fewer interrupts.
LAG (Link Aggregated Group) - Aggregates ports or
VLANs into a single virtual port or VLAN.
LAN - The computers and networking products that make
up your local network.
