Information Technology Reference
In-Depth Information
works.over.standard.telephone.lines.and.supports.data.
speeds.of.over.1.5.Mbps.downstream.(to.the.user).and.
slower.speeds.upstream.(to.the.Internet).
Digital Versatile Disk (DVD):. Currently,.these.optical.stor-
age. disks. are. being. pioneered. by. the. entertainment.
business,.notably.because.the.DVD.is.able.to.store.a.
full-length.feature.movie.on.a.single.CD-size.disk,.with.
faithful.reproduction.of.visual.and.audio.quality..DVD,.
with.a.capacity.(using.both.sides.of.the.disk).of.approx-
imately.17.GB,.will.doubtless.replace.the.present.CDs/
CD-ROMs.with.their.modest.670.MB.capacity.
Digital Watermark:. A.unique.identiier.that.becomes.part.of.
a.digital.document.and.cannot.be.removed..The.water-
mark.is.invisible.to.the.human.eye.but.a.computer.can.
analyze. the. document. and. extract. the. hidden. data..
Digital. watermarks. are. being. used. for. classiied/top.
secret.documents.(usually.military/governmental).and.
highly.conidential.commercial.material..The.primary.
use. of. such. marks. is. to. allow. different. marks. to. be.
used. when. the. document. is. copied. to. different. per-
sons.and.thereby.establish.an.audit.trail.should.there.
be.any.leakage.of.information.
Driver:. A. small. interface. program. that. allows. a. computer.
to. communicate. with. a. peripheral. device,. such. as. a.
printer.or.a.scanner..The.driver.will.be.automatically.
installed. when. you. connect. the. device. to. the. PC,.
hence. the. need. for. a. CD-ROM. or. loppy. disk. when.
installing.such.peripherals.
Dynamic Host Coniguration Protocol (DHCP):. Software.
that. automatically. assigns. IP. addresses. to. client. sta-
tions. logging. onto. a. TCP/IP. network.. It. eliminates.
having. to. manually. assign. permanent. IP. addresses..
DHCP. software. typically. runs. in. servers. and. is. also.
found. in. network. devices. such. as. ISDN. routers. and.
modem.routers.that.allow.multiple.users.access.to.the.
Internet..Newer.DHCP.servers.dynamically.update.the.
DNS.servers.after.making.assignments.
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