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DGS-3700 Series Layer 2 Gigabit Ethernet Switch Hardware Installation Guide
half duplex: A system that allows packets to be transmitted and received, but not at the same time. Contrast with full
duplex.
IP address: Internet Protocol ad dress. A uni que identifier f or a dev ice at tached t o a net work us ing T CP/IP. T he
address is written as four octets separated with full-stops (periods), and is made up of a network section, an optional
subnet section and a host section.
IPX: Internetwork Packet Exchange. A protocol allowing communication in a NetWare network.
LAN - Local Area Network: A network of connected computing resources (such as PCs, printers, servers) covering a
relatively small geographic area (usually not larger than a floor or building). Characterized by high data rates and low
error rates.
latency: The de lay b etween t he t ime a de vice r eceives a p acket and t he t ime t he p acket i s f orwarded out of t he
destination port.
line speed: See baud rate.
main port: The port in a resilient link that carries data traffic in normal operating conditions.
MDI - Medium Dependent Interface: An Ethernet port connection where the transmitter of one device is connected to
the receiver of another device.
MDI-X - Medium Dependent Interface Cross-over: An Ethernet por t c onnection where t he internal t ransmit and
receive lines are crossed.
MIB - Management Information Base: Stores a d evice's m anagement c haracteristics an d parameters. MI Bs ar e
used b y t he S imple N etwork Managem ent P rotocol ( SNMP) t o c ontain at tributes of t heir m anaged s ystems. The
Switch contains its own internal MIB.
multicast: Single p ackets c opied t o a s pecific s ubset of net work addr esses. T hese ad dresses ar e s pecified in t he
destination-address field of the packet.
protocol: A set of rules for communication between devices on a network. The rules dictate format, timing,
sequencing and error control.
resilient link: A pair of ports that can be configured so that one will take over data transmission should the other fail.
See also main port and standby port.
RJ-45: Standard 8-wire connectors for IEEE 802.3 10BASE-T networks.
RMON: Remote Mo nitoring. A s ubset of S NMP MIB I I t hat a llows m onitoring a nd m anagement c apabilities b y
addressing up to ten different groups of information.
RPS - Redundant Power System: A device that provides a backup source of power when connected to the Switch.
server farm: A cluster of servers in a centralized location serving a large user population.
SLIP - Serial Line Internet Protocol: A protocol, which allows IP to run over a serial line connection.
SNMP - Simple Network Management Protocol: A pr otocol or iginally d esigned t o be used i n m anaging T CP/IP
internets. SNMP is presently implemented on a wide range of computers and networking equipment and may be used
to manage many aspects of network and end station operation.
Spanning Tree Protocol (STP): A br idge-based s ystem for pr oviding f ault t olerance on networks. S TP w orks b y
allowing y ou to implement parallel paths for network traffic, and ensure that redundant paths are disabled when the
main paths are operational and enabled if the main paths fail.
stack: A group of network devices that are integrated to form a single logical device.
standby port: The port in a resilient link that will take over data transmission if the main port in the link fails.
switch: A dev ice, which f ilters, f orwards an d floods packets based on the pac ket's des tination address. The s witch
learns the addresses associated with each switch port and builds tables based on this information to be used for the
switching decision.
TCP/IP: A layered set of communications protocols providing Telnet terminal emulation, FTP file transfer, and other
services for communication among a wide range of computer equipment.
Telnet: A TCP/IP application protocol that provides virtual terminal service, letting a user log in to another computer
system and access a host as if the user were connected directly to the host.
TFTP - Trivial File Transfer Protocol: Allows you to transfer files (such as software upgrades) from a remote device
using your switch's local management capabilities.
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