WHAT IS VIRUS ?

Ans- a computer virus  is  without your knowledge  loaded on your computer .all computer virus is manmade .virus is harmfull  our pc

WHAT IS SUBNETTING ?

Ans- subnatting is process in which larger ip network is broken into seprated and smaller network 

IP ADDRESS

Q- WHAT IS  IP ADDRESS ?
Ans- ip address is identies two network device
on tcp/ip

AUTOMIC PRIVATE IP ADDRESSING (APIPA)

APIPA-

             ( AUTOMATIC PRIVATE IP ADDRESSING  IS A ADDRESSING) FEATURE FOR SINGLE NETWORK  SEGMENT. WHENEVER A COMPUTER RUNNING WINDOWS HAS BEEN CONFIGURED  OBTAIN ON IP ADDRESS AUTOMATICALLY AND WHEN D.H.C.P.  OR ETHERNET CONFIGURATION

IS AVAILABLE THE COMPUTER USES APIPA TO ASSIGN IN THE  RANGE  OF 

169.254.0.1 TO 169.254.255.254

PRIVATE ADDRESS

1.ACCORDING TO RFC-1918


2.ORGANIZATIONS MAKE USE OF THE PRIVATE INTERNET ADDRESS SPACE FOR HOSTS THAT REQUIRE IP CONNECTVITY 
WITH IN THEIR ENTERPRISE NETWORK BUT DO NOT  REQUIRE EXTERNAL CONNECTIONS TO THE GLOBAL INTERNET


3.CLASS A: 10.0.0.0

4.CLASS B :172.16.0.0,172.31.0.0

5CLASS C :192.168.0.0,192.168.255.0



SOME FULL FORMS-
                  RFC=REQUEST FORM COMMENTS
                  AWG=AMERICAN WIRED GAUGE
                  

MAKE CROSS CABLE

CROSS CABLE USED FOR SAME USED

(@).COMPUTER TO COMPUTER, SWITCH TO SWITCH, ROUTER TO ROUTER



1.ORANGE/WHITE          1.GREEN/WHITE
2.ORANGE                        2.GREEN
3.GREEN/WHITE             3.ORANGE/WHITE
4.BLUE                              4.BLUE
5.BLUE/WHITE                5.BLUE/WHITE
6.GREEN                           6.ORANGE
7.BROWN/WHITE            7.BROWN/WHITE
8.BROWN                           8.BROWN

MAKE STRAIGHT CABLE

U.T.P. (UNSHEILED TWISTED PAIR CABLE)-
                                                                               
USED- COMPUTER TO SWITCH , SWITCH TO ROUTER , ROUTER TO SWITCH




1. ORANGE/WHITE          1.ORANGE/WHITE
2.ORANGE                         2.ORANGE
3.GREEN/WHITE              3.GREEN/WHITE
4.BLUE                               4.BLUE
5.BLUE/WHITE                 5.BLUE/WHITE
6.GREEN                            6.GREEN
7.BROWN/WHITE             7.BROWN/WHITE 
8.BROWN                           8.BROWN