Extron Electronics System 5 IP Series User Guide - Manual (Page 116)

Reference Material, cont’d
System 5 IP Switchers • Reference Material A-10
PRELIMINAR
Y
the Internet, a table (see ARP) relates the device’s IP address to its
corresponding physical (MAC) address on the LAN.
Pass-through allows control systems to work with the switcher and provides a link
between two ports.
Ping (ICMP) is a utility/diagnostic tool that tests network connections. It is used to
determine if the host has an operating connection and is able to exchange
information with another host. The term (ping) is a reference to submarine
sonar, which sends out a signal and waits to hear it echo (“ping”) back from a
submerged object, much like how the ping utility functions in a network.
Port number is a preassigned address within a server that provides a direct route
from the application to the transport layer or from the transport layer to the
application of a TCP/IP system.
SMTP (Simple Mail Transfer Protocol) is a standard for e-mail exchange across
systems/networks on the Internet.
Static IP refers to an IP address that has been specifically (instead of dynamically—
see DHCP above) assigned to a device or system in a network configuration.
This type of address requires manual configuration of the actual network
device or system and can only be changed manually or by enabling DHCP.
Subnet See: subnetwork.
Subnet address The portion of an IP address that is specifically identified by the
subnet mask as the subnetwork.
Subnet mask A 32-bit address mask used in IP to identify the bits of an IP address
that are used for the subnet address. Using a mask, the router does not need
to examine all 32 bits, only those selected by the mask.
Subnetwork is a network that is part of a larger IP network and is identified by a
subnet address. Networks can be segmented into subnetworks to provide a
hierarchical, multilevel routing structure.
TCP (Transmission Control Protocol) is a connection-oriented protocol defined at
the Transport layer of the OSI reference model. It provides reliable delivery
of data.
TCP/IP (Transmission Control Protocol/Internet Protocol) is the communication
protocol (language) of the Internet. Computers and devices with direct
access to the Internet are provided with a copy of the TCP/IP program to
allow them to send and receive information in an understandable form.
Telnet is a standard terminal emulation utility/protocol that allows a computer to
communicate with a remote user/client. A user who wishes to access a
remote system initiates a Telnet session using the address of the remote client.
The user may be prompted to provide a user name and password if the client
is set up to require them. Telnet enables users to log in on remote networks
and use those resources as if they were locally connected.