공부
------------------ cmd ------------------------
1) ping -n 1 8.8.8.8
[ping -n x(x번을 의미한다.)]
1-1) ping 8.8.8.8
-> 기본적으로 4번 실행한다.
1-2) ping -l 1400 -n 1 8.8.8.8
1-3) ping -f -l 2000 -n 1 8.8.8.8
(-f는 Do Not Fragment)
2) arp -a
arp -d
3) netstat -r
4) ipconfig /all
L4: port address
->http://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml
port: 16bit -> 0~ 65535
A - 0
- 1
...
-65535
[ Port == Service ]
System Port(Well Known Port)
:web은 80 예를들어 www.naver.com:80
User Port(Registered Port)
:사용자 등록 Port
Dynamic/Private
:누구든지 사용할 수 있다.
http:80
smtp:25
192.168.0.0
(2^n = 2, n=1)
NNNNNNNN-NNNNNNNN-NNNNNNNN-HHHHHHHH
NNNNNNNN-NNNNNNNN-NNNNNNNN-NHHHHHHH
[1]: NNNNNNNN-NNNNNNNN-NNNNNNNN-0HHHHHHH
(1)Range:NNNNNNNN-NNNNNNNN-NNNNNNNN-00000000 NNNNNNNN-NNNNNNNN-NNNNNNNN-01111111
192.168.0.0 ~ 192.168.0.127
(2)192.168.0.0
(3)192.168.0.127
(4)192.168.0.1 ~ 192.168.0.126
comp1:192.168.0.1
comp2:192.168.0.2
comp3:192.168.0.3
gateway:192.168.0.126
[2] NNNNNNNN-NNNNNNNN-NNNNNNNN-1HHHHHHH
(2^n = 2, n=1)
NNNNNNNN-NNNNNNNN-NNNNNNNN-1NHHHHHH
NNNNNNNN-NNNNNNNN-NNNNNNNN-10HHHHHH
(1)Range:NNNNNNNN-NNNNNNNN-NNNNNNNN-10000000 NNNNNNNN-NNNNNNNN-NNNNNNNN-10111111
192.168.0.128 ~ 192.168.0.191
(2)192.168.0.128
(3)192.168.0.191
(4)192.168.0.129 ~ 192.168.0.190
comp4:192.168.0.129
comp5:192.168.0.130
comp6:192.168.0.131
gateway:192.168.0.190
NNNNNNNN-NNNNNNNN-NNNNNNNN-11HHHHHH
(1)Range:NNNNNNNN-NNNNNNNN-NNNNNNNN-11000000 NNNNNNNN-NNNNNNNN-NNNNNNNN-11111111
192.168.0.192 ~ 192.168.0.255
(2)192.168.0.192
(3)192.168.0.255
(4)192.168.0.193 ~ 192.168.0.254
comp7:192.168.0.193
comp8:192.168.0.194
comp9:192.168.0.195
gateway:192.168.0.254
192.168.1.0
NNNNNNNN-NNNNNNNN-NNNNNNNN-HHHHHHHH
(1)Range: 192.168.1.0 ~ 192.168.1.255
(2)192.168.1.0
(3)192.168.1.255
(4)192.168.1.1 ~ 192.168.1.254
comp10:192.168.1.2
comp11:192.168.1.3
comp12:192.168.1.4
gateway:192.168.1.254