| slovo | definícia |
mbone
(foldoc) | MBONE
Virtual Internet Backbone for Multicast IP.
IP-Multicast is the class-D addressing scheme in IP
implemented by Steve Deering at Xerox PARC. It was adopted
at the IETF March 1992 meeting and acquired the name MBONE
after the July 1992 IETF meeting.
IP Multicast-based routing allows distributed applications to
achieve real-time communication over IP {wide area
networks} through a lightweight, highly threaded model of
communication.
Each network-provider participant in the MBONE provides one or
more IP multicast routers to connect with tunnels to other
participants and to customers. The multicast routers are
typically separate from a network's production routers since
most production routers don't yet support IP multicast. Most
sites use workstations running the mrouted program, but the
experimental MOSPF software for Proteon routers is an
alternative.
Ideally, the machines running mrouted should be dedicated to
this task, for reasons of real-time performance and ease of
installing kernel patches. Since most intermediate nodes have
at least three tunnels, each carrying a separate (unicast)
copy of each packet, it is also useful to have multiple
network interfaces so it can be installed parallel to the
unicast router for those sites with configurations like this:
+----------+
| Backbone |
| Node |
+----------+
|
------------------------------------------ External DMZ Ethernet
| |
+----------+ +----------+
| Router | | mrouted |
+----------+ +----------+
| |
------------------------------------------ Internal DMZ Ethernet
This configuration allows the mrouted machine to connect with
tunnels to other regional networks over the external DMZ and
the physical backbone network, and connect with tunnels to the
lower-level mrouted machines over the internal DMZ, thereby
splitting the load of the replicated packets. The mrouted
machine would not do any unicast forwarding.
Note that end-user sites may participate with as little as one
workstation that runs the packet audio and video software and
has a tunnel to a network-provider node.
RFC 1112 gives the details.
FAQ (http://eit.com/techinfo/mbone/mbone.html).
(1994-11-11)
|
| | podobné slovo | definícia |
trombone
(encz) | trombone,pozoun n: Zdeněk Brožtrombone,trombón n: Zdeněk Brož |
trombone player
(encz) | trombone player, n: |
trombones
(encz) | trombones,pozouny n: pl. Zdeněk Brožtrombones,trombóny n: pl. Zdeněk Brož |
Trombone
(gcide) | Trombone \Trom"bone\, n. [It., aug. of tromba a trumpet: cf. F.
trombone. See Trump a trumpet.]
1. (Mus.) A powerful brass instrument of the trumpet kind,
thought by some to be the ancient sackbut, consisting of a
tube in three parts, bent twice upon itself and ending in
a bell. The middle part, bent double, slips into the outer
parts, as in a telescope, so that by change of the
vibrating length any tone within the compass of the
instrument (which may be bass or tenor or alto or even, in
rare instances, soprano) is commanded. It is the only
member of the family of wind instruments whose scale, both
diatonic and chromatic, is complete without the aid of
keys or pistons, and which can slide from note to note as
smoothly as the human voice or a violin. Softly blown, it
has a rich and mellow sound, which becomes harsh and
blatant when the tones are forced; used with discretion,
its effect is often solemn and majestic.
[1913 Webster]
2. (Zool.) The common European bittern.
[1913 Webster] |
Umbones
(gcide) | Umbo \Um"bo\, n.; pl. L. Umbones, E. Umbos. [L.]
1. The boss of a shield, at or near the middle, and usually
projecting, sometimes in a sharp spike.
[1913 Webster]
2. A boss, or rounded elevation, or a corresponding
depression, in a palate, disk, or membrane; as, the umbo
in the integument of the larvae of echinoderms or in the
tympanic membrane of the ear.
[1913 Webster]
3. (Zool.) One of the lateral prominences just above the
hinge of a bivalve shell.
[1913 Webster] Umbonate |
trombone
(wn) | trombone
n 1: a brass instrument consisting of a long tube whose length
can be varied by a U-shaped slide |
trombone player
(wn) | trombone player
n 1: a musician who plays the trombone [syn: trombonist,
trombone player] |
|