SMC Networks Barricade SMC2404WBR User Manual page 111

Q. What is MDI / MDI-X?
A. Medium Dependent Interface - Also called an "uplink port," it is a
port on a network hub or switch used to connect to other hubs or switches
without requiring a crossover cable. The MDI port does not cross the transmit
and receive lines, which is done by the regular ports (MDI-X ports) that
connect to end stations. The MDI port connects to the MDI-X port on the
other device. There are typically one or two ports on a device that can be
toggled between MDI (not crossed) and MDI-X (crossed).
Medium Dependent Interface – X (crossed) - A port on a network hub or
switch that crosses the transmit lines coming in to the receive lines going out.
Q. What is NAT?
A. Network Address Translation - An IETF standard that allows an
organization to present itself to the Internet with one address. NAT converts
the address of each LAN node into one IP address for the Internet and vice
versa. It also serves as a firewall by keeping individual IP addresses hidden
from the outside world. Firewalls are frequently used to prevent unauthorized
Internet users from accessing private networks connected to the Internet. All
messages entering or leaving the intranet pass through the firewall, which
examines each message and blocks those that do not meet the specified
security criteria.
Q. What is a MAC Address?
A. The unique serial number burned into Ethernet and Token Ring
adapters that identify that network card from all others.
Q. What is PPP over Ethernet?
A. Point-to-Point Protocol Over Ethernet - A method for running the