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4.ng dng ca UDPGIAO THC UDP
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Bng 3.1-1: Cc ng dng thng dng v giao thc giao vn tng ng.
ng dng Giao Thc Tng ng Dng Tng giao vn tng ng Th in t
SMTPTCPTruy cp t xa TelnetTCPWedHTTPTCPTruyn file FTPTCPFile Server
NFSThng l UDPa phng tin Ph thuc hng sn xut Thng l UDPin thoi qua
InternetPh thuc hng sn xut Thng l UDPQun l mng SNMPThng l UDPnh
tuyn RIPThng l UDPTn minDNSThng l UDP
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- DNS(Domain Name System): ch mt h thng cho php thit lp tng ng
giaa ch IPvtn min. H thng tn min (DNS) l mt h thng t tn theo th t
cho my vi tnh, dch v, hoc bt k ngun lc tham gia vo Internet. N lin
kt nhiu thng tin a dng vi tn min c gn cho nhng ngi tham gia. Quan
trng nht l, n chuyn tn min c ngha cho con ngi vo s nh danh (nh
phn), lin kt vi cc trang thit b mng cho cc mc ch nh v v a ch ha cc
thit b khp th gii.
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-Chc nng (DNS):Mi Website c mt tn (l tn min hay ng dnURL:Uniform
Resource Locator) v mt a ch IP. a ch IP gm 4 nhm s cch nhau bng du
chm(IPv4). Khi m mt trnh duyt Web v nhp tn website, trnh duyt s n
thng website m khng cn phi thng qua vic nhp a ch IP ca trang web.
Qu trnh "dch" tn min thnh a ch IP cho trnh duyt hiu v truy cp c vo
website l cng vic ca mt DNS server. Cc DNS tr gip qua li vi nhau
dch a ch "IP" thnh "tn" v ngc li. Ngi s dng ch cn nh "tn", khng cn
phi nh a ch IP (a ch IP l nhng con s rt kh nh).[1
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RIP l mt giao thc distance vector in hnh. Mi router s gi ton b
bng nh tuyn ca n cho router lng ging theo nh k 30s/ln. Thng tin ny
li tip tc c lng ging lan truyn tip cho cc lng ging khc v c th lan
truyn ra mi router trn ton mng. Kiu trao i thng tin nh th cn c gi l
lan truyn theo tin n. ( y, ta c th hiu router lng ging l router kt
ni trc tip vi router ang xt).
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-Trn hnh l s kt ni ca 03 router R1, R2 v R3. Cc router ny c kt
ni vi nhau bng cc ng serial point to point m t cc kt ni leased
line. Bn thn mi router li u ni xung cc mng LAN bng cc cng F0/0 ca
chng. Quy hoch IP cho cc phn on mng c m t chi tit trn s .
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- Network File System (NFS) dch v chia s ti nguyn. Khi nhu cu
trao i, chia se (sharing) d liu phat sinh trn mi trng may chu
RedHat, ban co th s dung dich vu Network File System (NFS) giai
quyt.Dich vu NFS cho phep chia se tp tin cho nhiu ngi dung trn cung
mang va ngi dung co th thao tac nh vi tp tin trn chinh ia cng cua
minh.
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. Hin nay tn tai 2 phin ban: NFS version 2 (NFSv2) va NFS
version 3 (NFSv3). Trong o phin ban NFSv2 c s dung kha ph bin trong
thi gian qua. Phin ban NFSv3 co thm im mi la h tr oc/ghi tp tin co
kich thc thay i, thng bao li tt hn.
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- Streaming Media:l mt phng thc hoc c th gi l mt cng ngh. Trong
, nh cung cp ti nguyn s pht cc ni dung a phng tin (multimedia) thnh
lung v cc ngi s dng cui (end-user) s tip nhn & th hin bng cc
cng c tng ng c h tr lung ny (nh Windows Media Player, Core Player,
...).
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-Gi in thoi qua Internet: Mt software mi mang tn Skype do Niklas
Zennstrom va Janus Friis thc hin. Tuy d Skype cn ang dang beta (th
nghim) v c phn pht min ph (trong thi gian hin ti), nhng a co gn 7
triu ngi tai xung dung th. V nhng ngi dng th nhn nh rng m thanh
nghe rt r.
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-SNMP(Simple Network Management Protocol) :l mt tp hp cc giao
thc khng ch cho php kim tra nhm m bo cc thit b mng
nhrouter,switchhayserverang vn hnh m cn vn hnh mt cch ti u, ngoi ra
SNMP cn cho php qun l cc thit b mng t xa.
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- Mt h thng s dng SNMP bao gm 2 thnh phn chnh:*Manager: L mt my
tnh chy chng trnh qun l mng. Manager cn c gi l mt NMS (Network
Management Station). Nhim v ca mt manager l truy vn cc agent v x l
thng tin nhn c t agent.*Agent: L mt chng trnh chy trn thit b mng cn
c qun l. Agent c th l mt chng trnh ring bit (v d nh daemon trnUnix)
hay c tch hp vo h iu hnh, v d nhIOS(Internetwork Operation System)
caCisco. Nhim v ca agent l thng tin cho manager.
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-VoIP(vit tt caVoice over Internet Protocol, ngha lTruyn ging ni
trn giao thc IP) lcng nghtruyn ting ni ca con ngi quamng thng tins
dng b giao thcTCP/IP. N s dng cc gi d liu IP (trn mng LAN,
WAN,Internet) vi thng tin c truyn ti l m ho ca m thanh.
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