1581, 76/80 ȸ  α  
  
   http://soyu.cafe2.net
   Ʈ ũ

http://www.hackerschool.org/HS_Boards/zboard.php?id=Free_Lectures&no=90 []




   Ʈ ũ     


Ʈũ ¸ ϰڽϴ. Ʈũ ˾ƾ ŷ Ѵٴ°

̹ ˰ ǰ̴ϴ.

̷ ̷ ϰڽϴ. ׷ ڽϴ.



1. network

1) tcp/ip

-> tcp/ip Tansmission Control Protocol/Internet Protocol Դϴ.

! ݰ ͳ .

̶ ǻͰ Ծ Դϴ.

1 亯 2 ... Ѱ.

tcp/ip ͳ ̶ Ͻø ˴ϴ.



2) OSI 7 layer

-> OSI ǥ Դϴ. ̷л Ʈ .

OSI մϴ. 7 layer 캸.



7 : application α׷

6 : presentation ǥ

5 : session

4 : transport

3 : network Ʈũ

2 : datalink ũ

1 : phisical (ϵ)



츮 ⼭ 4 캸 մϴ.



(1) datalink

-> Ʈũ ̽ ̶ Ҹ ϵ κԴϴ.

̽ ̹ Ʈũ ī մϴ.



(2) network

-> Ʈũ Ŷ ٷ մϴ. router մϴ.

**router : Ʈũ a-b ִ ѱ ãִ

Ʈ ϴ.

̰ 츮 ģ ip ֽϴ.



(3) transport

-> ̰ 츮 ģ tcp ִ Դϴ.

Դϴ.



(4) application

-> α׷ Դϴ.

telnet, ftp 츮 α׷ Դϴ.



! ׷ ̷ ϰ ϴ! ϽDzϴ.

Ʈũ ̱ Դϴ.

캸.



7 : ̰ telnet ȭ濡  ȳ̶ ޼ ϴ.

4 : ͸ Ģ ° ͸ մϴ.

tcp Ȯ Ϸ Դϴ.

3 : ̰ 濡 մϴ.

2 : ̰ ȣ ȣ ٲݴϴ.

1 : ̰ ȭ 濡 ȳ ϴ.





ƽð? Ʈŷ 7 layer ̷ ϴ. 5 6

һ ƴ϶ е ʿ䰡 ߽ϴ.



3) tcp/ip ô.

Ư¡ 캸.



(1) Ȯ强

-> 尡 þ Ʈũ Ȯ忡 ʽϴ.

AŬ BŬ CŬ DŬ ֽϴ.

̰Ͷ Ȯ ѵ... ̰ 캸.

IP巹 ˼ ֽϴ.



210.160.134.1



⼭ 210 AŬ ...1 DŬ Դϴ.

Ŭ 255 Ȯ Ҽ ֽϴ. 255 4 ŭ

Ȯ Ѱ. Ѻκд 8BYTE մϴ. ׸ IP ߺ Ǹ

ϴ. InterNIC ̶ մϴ.

cŬ 210.160.134 ip ޾Ҵٸ ڿ 1~255

255 ip Ҽ ִ°Դϴ.

210.160.134.1 ~ 210.160.134.255 .

(2) ͳݰ

-> б ִ ǻ͵ lan Ҷ tcp/ip Ѵٸ ߿

ͳ ȮҶ ٷ ͳݰ Ҽ ִٴ ֽϴ.

׸ ͳ ϴ ̶ .

(3) 뼺

-> ü Ÿ ٸ α׷ ȣȯشٴ ֽϴ.

˼ ? linux unix windows ȣȯ ˴ϴ.

(4) 漺

-> tcp/ip Ͽ α׷ ص ްų ʽϴ.



(5) ! ׷ 츮 ǻͰ ٸ ǻͱ ɶ ϰڽϴ.



츮 telnet nownuri.net̶ Էߴٰ սô.



⼭ nownuri.net DOMAIN NAME ̶ θϴ. DOMAIN NAME IPּҸ

츮 ˾ƺ ٲ۰Դϴ.



׷ 츮 DNS(DOMAIN NAME SYSTEM)񽺸 ϴ° ؼ NOWNURI.NET

̶ DOMAIN NAME  IP ˾Ƴϴ. name resolution̶

θϴ.



׷ ip MAC ּҸ ˾Ƴ մϴ. MAC ADDRESS

Ʈũ ī 1ۿ ּԴϴ. ǻʹ IP ARP

ؼ MAC ּҸ ˾Ƴ μҾ nownuri û

ϴ°Դϴ. ip resolution̶ մϴ.

ARP IP->MAC ȯִ°Դϴ. MAC->IP ִ

RARP մϴ.



ûҶ telnetα׷ 23 Ʈ ûմϴ.

port Ʈũ ױԴϴ. 23 port telnet񽺷 ϴ ױ

Դϴ.

ణ ֿ port ϸ...



21 : ftp service

23 : telnet service

25 : sendmail service

80 : http service

111: pop service

513: telnet login service(udp,tcp)



⼭ 513Ʈ udp tcp° ɴϴ. udp ܾ. udp

ϰڽϴ.

udp user datagram protocol Դϴ.

udp ʽϴ. ׿ tcp .

׸ udp ͸ ɰµ մϴ. ۵ .



nownuri Ŷ ϴµ ͳݿ սϴ.

߿ ip ̶ մϴ.



layer忡 ...

鼭 Ư Ŷ ϴ.

tcp tcp׸Ʈ ׸ ip ipش ϴ.

̷ ĸ̼ ̶ մϴ.

׷ 촩 Ŷ ޾Ƽ 1 7 ø鼭

° ܳϴ. Ƽ÷̶ մϴ.



ݱ Ŭ̾Ʈ 츮 촩 ϴ Ѻҽϴ.



(6) 127.0.0.1

-> ּҴ ڽ ǻͶ Դϴ. ǻͿ ּҰ ֽ

.

̰ localhost Դϴ.



(7) ũ(subnet mask)

-> ̰ Ʊ cŬ ޾ 255 ȣƮ Ҽ ִ.

帰 1ܾ ǥѰԴϴ.

׸ routing Ҷ ũ µ

203.240.178.40 ̶ ϰ cŬ ϸ

203.240.178 մϴ. ״ εij

203.240.178.40 ã°. ̰ Ʈij̶ θϴ.



(8) MTU

-> ִ ѹ Ҽִ Ŷ .

! ݱ Ʈũ TCP/IP õ κи ~ ϰ 캸Ҵµ



ֽǰ ֽϴ. TCP IP ߻ Ÿ ׸ ֽϴ.

װ ѹ ãƼ ֽñ ٶϴ.



: network bible Ŀ Ŀ ڵ



  Hit : 18117     Date : 2003/10/05 06:50



    
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