Foundation Summary 115
Table 3-15 summarizes the flow control terms and provides examples of each of the three types
of flow control.
Table 3-16 summarizes most of the details about MAC addresses.
Table 3-15
Flow-Control Methods--Summary
Name Used in This Book
Other Names
Example Protocols
Buffering
--
--
Congestion avoidance
Stop/Start, RNR, Source Quench
SDLC, LAPB, LLC2
Windowing
--
TCP, SPX, LLC2
Table 3-16
LAN MAC Address Terminology and Features
LAN Addressing Terms and
Features
Description
MAC
Media Access Control. 802.3 (Ethernet) and 802.5 (Token
Ring) are the MAC sublayers of these two LAN data link
protocols.
Ethernet address, NIC address, LAN
address, Token Ring address, card
address
Other names often used instead of MAC address. These
terms describe the 6-byte address of the LAN interface card.
Burned-in address
The 6-byte address assigned by the vendor making the card.
It is usually burned in to a ROM or EEPROM on the LAN
card, and it begins with a 3-byte Organizationally Unique
Identifier (OUI) assigned by the IEEE.
Locally administered address
Via configuration, an address that is used instead of the
burned-in address.
Unicast address
Fancy term for a MAC that represents a single LAN
interface.
Broadcast address
An address that means "all devices that reside on this LAN
right now."
Multicast address
Not valid on Token Ring. On Ethernet, a multicast address
implies some subset of all devices currently on the LAN.
Functional address
Not valid on Ethernet. On Token Ring, these addresses are
reserved to represent the device(s) on the ring performing a
particular function. For example, all source-route bridges
supply the ring number to other devices. To do so, they each
listen for the Ring Parameter Server (RPS) functional
address.
ch03.fm Page 115 Monday, March 20, 2000 4:58 PM