3Com SuperStack II 3300 User Manual page 152

152 G
LOSSARY
backbone area
backbone router
BOOTP
border router
class A network
class B network
class C network
designated router
distance-vector
routing
DHCP
A special OSPF Area 0 (often written as Area 0.0.0.0, since OSPF Area
IDs are typically formatted as IP addresses). The OSPF backbone always
contains all area border routers. The backbone is responsible for
distributing routing information between non-backbone areas.
A backbone router only has interfaces in the OSPF backbone area.
The BOOTP protocol allows you to automatically map an IP address to a
given MAC address each time a device is started. In addition, the
protocol can assign the subnet mask and default gateway to a device.
A border router has interfaces in more than one OSPF area, in other
words, it is positioned between two or more OSPF areas.
An IP network in the range of 0.0.0.0 to 127.0.0.0 with a subnet mask
of 255.0.0.0.
An IP network in the range of 128.0.0.0 to 191.255.0.0 with a subnet
mask of 255.255.0.0.
An IP network in the range of 192.0.0.0 to 223.255.255.0 with a
subnet mask of 255.255.255.0.
In OSPF, each multiaccess network with at least two attached routers
has a designated router. The designated router has special duties in the
running of the protocol, such as generating a link state advertisement
for the multiaccess network.
In distance-vector routing, each device calculates the best path to all
destinations using a simple metric (for example, the number of hops to
a destination) and then shares that information with neighboring
routers. The devices continually update their tables as soon as they
learn of better routes to their destinations.
Dynamic Host Configuration Protocol — DHCP is a protocol which
allows dynamic allocation of IP addresses to IBM PCs running on a
Microsoft Windows local area network. The system administrator
assigns a range of IP addresses to DHCP. Each client PC on the LAN can
use its TCP/IP software to request an IP address from the DHCP server.
DHCP uses a lease concept to respond to a request for an IP address
and to grant an IP address to client PC. The system administrator can
control for how long a client can use a particular IP address.