WHOREAD THE FOLLOWING PASSAGE AND MARK THE LETTER A, B, C, OR D ON YOUR ANSWER SHEET TOINDICATE THE CORRECT ANSWER TO EACH OF THE QUESTIONS FROM 31 TO 35
Câu 30 (NB):
A.
when
B.
which
C.
why
D.
who
Read the following passage and mark the letter A, B, C, or D on your answer sheet to
indicate the correct answer to each of the questions from 31 to 35.
One of the greatest security threats in the online world is computer hacking. Hackers are people
who illegally enter systems.
They
may alter or delete information, steal private information, or
spread viruses that can damage or destroy files. But how exactly can a hacker get into a system
to do these things?
Most hackers use information called protocols that are built into computer software. These
protocols allow computers to interact with one another. Protocols are sort of like computer
police officers. When a computer connects to another system, the protocols check to see if the
access is
valid. The protocols can also determine how much information can be shared between
the two systems. Hackers can manipulate the protocols to get unlimited access to a computer
system.
In fact, just the act of entering a computer network is commonly considered passive hacking.
Passive hackers get a rush from just being able to access a challenging system like a bank or
military network. Another kind of hacker tries to do damage to a system. After hacking into
systems, these hackers release viruses or alter, delete, or take information. Known as active
hackers, they are the more dangerous of the two.
The easiest way to protect a system is with a good password. Long and unusual passwords are
harder for hackers to guess. For even greater security, some online services now use “password-
plus” systems. In this case, users first put in a password and then put in a second code that
changes after the user accesses the site. Users either have special cards or devices that show
them new code to use the next time. Even if a hacker steals the password, they won’t have the
code. Or if the hacker somehow gets the code, they still don’t know the password.