Download - Chuong 7 - Tang Ung Dung
-
7/29/2019 Chuong 7 - Tang Ung Dung
1/40
1
Chng 7:
Tng ng dng
D n HEDSPI
Khoa CNTT- HBK H Ni
Ging vin: Ng Hng Sn
B mn Truyn thng v Mng my tnh
-
7/29/2019 Chuong 7 - Tang Ung Dung
2/40
2
Tng quan
Bui trc: Tng giao vn Nguyn l ca tng giao vn
TCP v UDP
Khi nim kim sot lung v kim sot tcnghn
Hm nay: Tng ng dng
Nguyn l ca tng ng dng Case study: HTTP, Mail, FTP
-
7/29/2019 Chuong 7 - Tang Ung Dung
3/40
3
Khi nim c bn
-
7/29/2019 Chuong 7 - Tang Ung Dung
4/40
4
Nhc li v kin trc phn tng
Application
(HTTP, Mail, )
Transport
(UDP, TCP )
Network
(IP, ICMP)
Datalink
(Ethernet, ADSL)
Physical
(bits)
H tr cc ng dng trn mng
Truyn d liu gia cc ng dng
Chn ng v chuyn tip gi tin giacc my, cc mng
H
tr
vic truy
n thng cho cc thnhphn k tip trn cng 1 mng
Truyn v nhn dng bit trn ngtruyn vt l
-
7/29/2019 Chuong 7 - Tang Ung Dung
5/40
5
ng dng trn mng?
CHATGAME
ON LINE
WEB
MAIL
SKYPE
YOUTUBE
SSHTELNET
FTP
VoD
SCHOOL
ON THEINTERNET
GOOGLE
BITTORENTE-COMMERCE
EBAY
MUSIC ONLINE
GRID
VIDEOCONFERENCE
e-BANK
VoIP
NEWS
SMS
e-Office
e-Goverment
-
7/29/2019 Chuong 7 - Tang Ung Dung
6/40
6
ng dng v giao thc ng dng
ng dng :
Cc tin trnh (c giao tip vinhau) trn Internet Hot ng trn cc h thng
cui Trao i thng ip
Giao thc ng dng nh ngha cc quy tc giao tip S dng cc dch v giao vn
(TCP/UDP)
V d ng dng/giao thc: Web (HTTP)
Mail (SMTP/POP/IMAP)
applicationtransportnetwork
data linkphysical
applicationtransportnetworkdata linkphysical
applicationtransport
networkdata linkphysical
-
7/29/2019 Chuong 7 - Tang Ung Dung
7/40
7
Cc thnh phn ca ng dng
Giao din NSD: H tr cho NSD lm vic vi ng dng, e.g. trnh duyt
Web (Firefox, IE), chng trnh gi th (Thunderbird,Outlook,..)
Ci t cc giao thc v s dng dch v giao vn
Tin trnh ng dng: mt chng trnh ang chy
Cc tin trnh giao tip ntn?
Trn mt my: IPC (inter-process communication) Gia cc my trn mng: Giao thc ng dng
Socket
-
7/29/2019 Chuong 7 - Tang Ung Dung
8/40
8
Giao tip gia cc tin trnh trnInternet
Nhc li: Socket l mt giao
din gia tin trnh ng dngv tng giao vn Socket c nh danh bi
S hiu cng
a chIP Kiu giao thc giao vn
(TCP hay UDP)
Socket API (Application
Programming Interface): Chophp cc tin trnh la chntham s, la chn dch v
process
transportlayer
services
socket
host orserver
process
transport
layerservices
socket
host orserver
Internet
controlled by
app developer
controlled
by OS
-
7/29/2019 Chuong 7 - Tang Ung Dung
9/40
9
Cc m hnh ng dng
Khch-ch
P2P
M hnh lai
-
7/29/2019 Chuong 7 - Tang Ung Dung
10/40
10
M hnh khch ch Khch
Gi yu cu truy cp dch vn my ch
C th c a chIP ng hayvo mng khng thng xuyn
V nguyn tc, khng lin lctrc tip vi cc my khch
khc Ch
Thng xuyn online a chIP tnh
C th c my ch d phng nng cao hiu nng, phng sc
e.g. Web, Mail,
client
client
client
client
Server
-
7/29/2019 Chuong 7 - Tang Ung Dung
11/40
11
M hnh im-im thun ty Khng c my ch trung tm
Cc my c vai tr ngangnhau
Hai my bt k c th lin lctrc tip vi nhau
C th c IP ng, khng cnvo mng thng xuyn
E.g. Gnutella
PeerPeer
Peer
Peer Peer
Peer
-
7/29/2019 Chuong 7 - Tang Ung Dung
12/40
12
M hnh lai
Mt my ch trung tm
qun l NSD, thngtin tm kim Cc my khch s giao
tip trc tip vi nhau
sau khi ng nhp E.g. Skype
My ch Skype qun lcc phin ng nhp, mt
khu Sau khi kt ni, cc my
s gi VoIP trc tip chonhau
Server
Client
Client
Client
Client-Server Comm.
P2P Comm.
-
7/29/2019 Chuong 7 - Tang Ung Dung
13/40
13
Case study 1: HTTP v WWW
-
7/29/2019 Chuong 7 - Tang Ung Dung
14/40
14
HTTP v Web
WWW: World Wide Web
trao i ti liu siu vn bnHTML (HyperText MarkupLanguage) trn Internet
HTTP: HyperText Transfer
Protocol M hnh Client/Server
Client yu cu truy nhp ti cctrang web (cc i tng web)
v hin th chng ln trnh duyt Server: Nhn yu cu v tr li
cho client
httprequest
httprequ
est
http
resp
onse
httpresponse
Web clients
Web
server
IE
Firefox
Navigator
-
7/29/2019 Chuong 7 - Tang Ung Dung
15/40
15
HTTP hot ng ntn?
Server m mt TCP socket ch ti cng 80 (default)
Client khi to mt lin kt TCP ti server Server chp nhn yu cu to lin kt
Trao i thng ip HTTP (giao thc ng dng) HTTP Request
HTTP Response
ng lin kt TCP
-
7/29/2019 Chuong 7 - Tang Ung Dung
16/40
16
Khun dng HTTP request
M ASCII (d dng c c di dng vn bn)
GET /dccn/index.html HTTP/1.1
Host: www.it-hut.edu.vn
User-agent: Mozilla/4.0
Connection: close
Accept-language:en-us
(extra carriage return, line feed)
request line(GET, POST,
HEAD commands)
headerlines
CR, LF
indicates endof message
-
7/29/2019 Chuong 7 - Tang Ung Dung
17/40
17
Khun dng HTTP response
HTTP/1.1 200 OK
Connection close
Date: Tue, 16 Mar 2008 12:00:15 GMT
Server: Apache/1.3.0 (Unix)
Last-Modified: Mon, 15 Mar 2008 ...Content-Length: 8990
Content-Type: text/html
data data data data data ...
status line
(protocolstatus codestatus phrase)
headerlines
data, e.g.,requestedHTML file
-
7/29/2019 Chuong 7 - Tang Ung Dung
18/40
18
Cc lin kt HTTP
HTTP khng duy tr
Chmt i tng webc gi qua lin ktTCP
S dng mc nhtrong HTTP/1.0
HTTP 1.0: RFC 1945
HTTP c duy tr
Nhiu i tng c thc gi qua mt linkt TCP.
S dng mc nhtrong HTTP/1.1
HTTP 1.1: RFC 2068
-
7/29/2019 Chuong 7 - Tang Ung Dung
19/40
19
Hot ng ca HTTP/1.0
Time Time
Web client Web server
TCPConn.Req.
GET/index.html
index.html
Accepted
Init TCP connection
Send HTTP response: index.html
Close TCP connection
OK, send HTTP request
Accept TCP connection
GETimg1.jpg
Parse index.html: has 10reference to 10 images
Repeat above steps 10times!
Send images 1
Close TCP connection
TCPConn.Req.
img1.jpg
Accept TCP connection
2xRTT
-
7/29/2019 Chuong 7 - Tang Ung Dung
20/40
20
Hot ng ca HTTP/1.1
Time Time
Web client Web server
TCPConn.Req.
GET/index.html
GET
index.html
Accepted
Init TCP connection
Send HTTP
response: index.html
OK, send HTTP request
Accept TCP connection
GET
img1.jpg
request images 2
Parse index.html: has 10reference to 10 images
request images 1
Send images 1
Send images 2
request images 10
Stop-and-
wait!
Pipeline
-
7/29/2019 Chuong 7 - Tang Ung Dung
21/40
21
HTTP/1.1 vi pipeline
Time Time
Web client Web server
TCPConn.Req.
GET/index.html
GET
index.htm
l
Accepted
Init TCP connection
Send HTTP
response: index.html
OK, send HTTP request
Accept TCP connection
Parse index.html: has 10reference to 10 images
request images 1 -10
Send images 1-10
-
7/29/2019 Chuong 7 - Tang Ung Dung
22/40
22
Cc phng thc trong thng
ip yu cu
HTTP/1.0
GET POST
HEAD
yu cu my ch loi mts i tng ra khi thngip tr li
HTTP/1.1
GET, POST, HEAD PUT
ti file ln my ch, ngdn chra trong URL, file
trong body DELETE
Xa file chra bi ngdn
Lu : C 2 cch gi tham s n server: POST hoc GET
http://www.google.com/search?q=computer+network&flags=68&num=10
-
7/29/2019 Chuong 7 - Tang Ung Dung
23/40
23
M trng thi tr li
200 OK
request succeeded, requested object later inthis message
301 Moved Permanently requested object moved, new location specified
later in this message (Location:)
400 Bad Request
request message not understood by server404 Not Found
requested document not found on this server
505 HTTP Version Not Supported
Trong dng u tin ca thng ip tr li, v d
-
7/29/2019 Chuong 7 - Tang Ung Dung
24/40
24
B m- Caching Cache: B nh m
Khi nim b nh cachetrong my tnh L1 cache, L2 cache
cache miss, cache hit
Xem xt trng hp sau: Mt t chc c mt ng
ni ti Internet Tt c lu lng truy cp
web u i qua lin kt ny Nhiu NSD web c th
cng truy nhp ti cng mtni dung
Gii php ci tin?
www.xyz.com/index.htm
-
7/29/2019 Chuong 7 - Tang Ung Dung
25/40
25
S dng b m web - proxy
NSD t tham s kt nitruy cp web ca trnh
duyt qua mt my chproxy
trnh duyt gi yu cun proxy Miss: Proxy gi yu cu
ti my ch web, tr litrnh duyt v lu mi tng web
Hit: Proxy tr i tngweb cho trnh duyt
client
Proxyserver
client
HTTP
reques
t
HTTP
respon
se
HTTPrequest H
TTPreq
uest
Web
server
HTTPresponse HTT
Prespons
e
-
7/29/2019 Chuong 7 - Tang Ung Dung
26/40
26
Web caches
Proxy: Va l client, va l server
S dng bi cc ISP nh, cc t chc nh trnghc, cng ty
nh hng ca proxy Lm gim lu lng web trn ng ra Internet C th lm gim thi gian p ng
Th phn tch vi trng hp
cache hit cache miss
proxy b qu ti
Trang web thay i/trang web ng?
-
7/29/2019 Chuong 7 - Tang Ung Dung
27/40
27
Phng thc GET c iu kin Mc ch: My ch s
khng gi i tng webnu proxy cn lu gi thngtin cp nht
Proxy: chra thi gian cca i tng
If-modified-since:
server: Xc nhn li c thayi hay khng:
HTTP/1.0 304 Not Modified
proxy server
HTTP request msgIf-modified-since:
HTTP responseHTTP/1.0
304 Not Modified
objectnot
modified
HTTP request msgIf-modified-since:
HTTP responseHTTP/1.0 200 OK
objectmodified
-
7/29/2019 Chuong 7 - Tang Ung Dung
28/40
-
7/29/2019 Chuong 7 - Tang Ung Dung
29/40
29
Th in t Chng trnh c/son tho th
Ly th t my ch, gi th nmy ch
e.g. Outlook, Thunderbird
My ch th in t: Cha hp th n ca NSD (mail
box) Hng i gi th i e.g. Sendmail, MS Exchange
useragent
mailserver
mailserver user
agent
Giao thc:
Chuyn th: STMP-SimpleMail Transfer Protocol
nhn th POP Post Office Protocol
IMAP Internet MailAccess Protocol
SMTPPOP
IMAP
Mail box Message queue
IMAP
POP
SMTPSMTP
-
7/29/2019 Chuong 7 - Tang Ung Dung
30/40
30
Giao thc SMTP
RFC 2821
TCP, port 25: Chuyn th t client n server vgia cc server vi nhau 3 giai on
Lp lin kt Chuyn th ng lin kt
Tng tc yu cu/tr li Yu cu: Lnh vi m ASCII Tr li: m trng thi v d liu
-
7/29/2019 Chuong 7 - Tang Ung Dung
31/40
31
Cc giao thc nhn th
POP: Post Office Protocol [RFC 1939]
ng nhp v ly ht th v
IMAP: Internet Mail Access Protocol [RFC 1730]
Phc tp hn POP Cho php lu tr v x l th trn my ch
Quota?
HTTP: gmail, Hotmail, Yahoo! Mail, etc.
useragent
senders mailserver
useragent
SMTP SMTP accessprotocol
receivers mailserver
-
7/29/2019 Chuong 7 - Tang Ung Dung
32/40
32
Khun dng thng ip th in
tSMTP: Giao thc truyn
thRFC 822: nh ngha khundng
Phn u To:
From:
Subject:
Phn thn m ha di dng m
ASCII
header
body
blankline
-
7/29/2019 Chuong 7 - Tang Ung Dung
33/40
33
chuyn d liu a phng tin:
multimedia extensions MIME: multimedia mail extension, RFC 2045, 2056
Thm mt dng trong phn u chr khun dng d
liu gi i
From: [email protected]: [email protected]: Picture of yummy crepe.MIME-Version: 1.0Content-Transfer-Encoding: base64Content-Type: image/jpeg
base64 encoded data ....................................base64 encoded data
multimedia datatype, subtype,
parameter declaration
method usedto encode data
MIME version
encoded data
-
7/29/2019 Chuong 7 - Tang Ung Dung
34/40
34
Case Study 3
ng dng truyn tp
-
7/29/2019 Chuong 7 - Tang Ung Dung
35/40
35
FTP: File Transfer Protocol
M hnh Client-server
Trao i file gia cc my
RFC 959 S dng TCP, cng 20, 21
TCP dataconnection, port 20
FTP
server
user
interface
FTP
client
local file system remote file system
user
TCP controlconnection, port 21
iu khin Out-of-band : Lnh ca FTP : cng 21
D
li
u: cng 20
NSD phi ng nhp trc khitruyn file
Mt s server cho php NSD
vi tn l anonymous
-
7/29/2019 Chuong 7 - Tang Ung Dung
36/40
36
Lnh v m tr li
Mt s v d USER username
PASS password
LIST : tr v danh schfile
RETR filename Ly file
STOR filename t fileln my ch
V d v m tr li 331 Username OK,
password required
125 data connectionalready open; transfer
starting
425 Cant open dataconnection
452 Error writing file
-
7/29/2019 Chuong 7 - Tang Ung Dung
37/40
37
V d v ftp client
C:\Documents and Settings\hongson>ftpftp> ?
Commands may be abbreviated. Commands are:
! delete literal prompt send
? debug ls put statusappend dir mdelete pwd traceascii disconnect mdir quit typebell get mget quote userbinary glob mkdir recv verbose
bye hash mls remotehelpcd help mput rename
close lcd open rmdir
Command line
GUI FTP clients: IE, Firefox, GFTP, .
-
7/29/2019 Chuong 7 - Tang Ung Dung
38/40
38
Tm tt
M hnh ng dng
Client-server vs. P2P Mt s ng dng v giao thc
HTTP
Mail FTP
V nh, hy tm hiu thm
P2P
Giao din lp trnh Socket
-
7/29/2019 Chuong 7 - Tang Ung Dung
39/40
39
Bui hc ti: Data-link Layer Cc nguyn l tng Data-link
Mng LAN
-
7/29/2019 Chuong 7 - Tang Ung Dung
40/40
40
Acknowledgment
Bi ging c s dng cc t liu v hnh v
t: Ti liu ca trng i hc Keio v Ritsumekan
Ti liu Computer Network, a top downapproach ca J.F Kurose v K.W. Ross