
The greater threat to computer is a computer virus,a program that causes a computer system to behave in unexpected and undesirable ways.Some signs of a virus include inexplicable loss of free memory,unusually long times for program loading or execution,changes in file or program size,print routines that stop working ,computers”freezing up”‘strange beeps or messages,computer reboot in the middle…

1.It is TDMA(time division multiple access) FDMA(frequency division multiple access)technology. 2.The initial coverage area for each cell is greatly offered by link budget.(how much loss(db)can be tolerated over the air link between the phone & base station). 3.It is having hard hand off.(break before make). 4.It cover less cell radius. 5.GSM claim 3/9 reuse pattern(theree…