NETGEAR 7300 Series - Manual (Page 357)

User Manual for the NETGEAR 7300 Series Layer 3 Managed Switch Software
Glossary C-15
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protocol. This protocol's algorithm determines the shortest path from its router to all the other routers in the
network. This protocol is rapidly replacing RIP on the Internet.
Open Systems Interconnection
OSI is a seven (7) layer architecture model for communications systems developed by the ISO for the
interconnection of data communications systems. Each layer uses and builds on the services provided by
those below it.
OSI
See “Open Systems Interconnection” on page 15.
OSPF
See “Open Shortest Path First” on page 14.
P
packet
A block of information sent over a network. A packet typically contains a source and destination network
address, some protocol and length information, a block of data, and a checksum.
PDU
See “Protocol Data Unit” on page 16.
PHY
The OSI Physical Layer: The physical layer provides for transmission of cells over a physical medium
connecting two ATM devices. This physical layer is comprised of two sublayers: the Physical Medium
Dependent (PMD) sublayer, and the Transmission Convergence (TC) sublayer.
PIM-DM
See “Protocol Independent Multicast – Dense Mode” on page 16.
PMC
Packet Mode Channel.
Point-to-Point Protocol
PPP. A protocol allowing a computer using TCP/IP to connect directly to the Internet.
Port Mirroring
Also known as a roving analysis port. This is a method of monitoring network traffic that forwards a copy of
each incoming and outgoing packet from one port of a network switch to another port where the packet can
be studied. A network administrator uses port mirroring as a diagnostic tool or debugging feature, especially
when fending off an attack. It enables the administrator to keep close track of switch performance and alter it