Which of the following can be done over telephone lines, e-mail, instant messaging, and any other
method of communication considered private.

A.
Shielding

B.
Spoofing

C.
Eavesdropping

D.
Packaging

Explanation:
Eavesdropping is the process of listening in private conversations. It also includes attackers listening
in on the network traffic. For example, it can be done over telephone lines (wiretapping), e-mail,
instant messaging, and any other method of communication considered private.
Answer option B is incorrect. Spoofing is a technique that makes a transmission appear to have
come from an authentic source by forging the IP address, email address, caller ID, etc. In IP spoofing,
a hacker modifies packet headers by using someone else’s IP address to hide his identity. However,
spoofing cannot be used while surfing the Internet, chatting on-line, etc. because forging the source
IP address causes the responses to be misdirected.
Answer option A is incorrect. Shielding cannot be done over e-mail and instant messaging. Shielding
is a way of preventing electronic emissions that are generated from a computer or network from
being used by unauthorized users for gathering confidential information. It minimizes the chances of
eavesdropping within a network. Shielding can be provided by surrounding a computer room with a
Farady cage. A Farady cage is a device that prevents electromagnetic signal emissions from going
outside the computer room. Shielding can also protect wireless networks from denial of service
(DoS) attacks.
Answer option D is incorrect. Packaging is a process in which goods are differentiated on the basis of
the container in which they are stored, such as bottles, boxes, bags, etc.
“http.//en.wikipedia.org/wiki/Eavesdropping”