G
LOSSARY
Glossary-5
Media Access Control (MAC)
A portion of the networking protocol that governs access to the
transmission medium, facilitating the exchange of data between network
nodes.
Media Dependent Interface (MDI)
The IEEE standard for the UTP interface to twisted-pair Ethernet. MDI
defines a straight-through pin assignment that allows you to connect the
router to any workstation or server that has a properly installed network
adapter card using the supplied crossover cable. Pin-out assignments are
shown in Appendix B.
Media Dependent Interface - Crossed (MDI-X)
MDI-X port types cross the receive and transmit signals internally, and can
be used with straight-through cable to connect the router to a similar
networking device (such as a hub or switch). Note that if you use the
supplied crossover cable to connect to a similar networking device, then
you must connect to an MDI port on the other device. Pin-out
assignments are shown in Appendix B.
Multiprotocol Encapsulation
A method whereby multiple protocol types can be passed over a single
ATM PVC.
Network Address Translation (NAT)
A standard that enables a local-area network (LAN) to use one set of IP
addresses for external traffic and a second set of addresses for internal
traffic.
Network Address Port Translation (NAPT)
NAPT is a special case of NAT, where internal IP numbers are hidden
behind a single external addresses, allowing you to connect many local
users to the Internet with a single-user ISP account. With NAPT, an