Which of the following is the most common method used by attackers to identify wireless networks?

A.
Back door

B.
Packet sniffing

C.
Packet filtering

D.
War driving

Explanation:

War driving is the most common method used by attackers to identify wireless networks. In war
driving, a person drives around businesses and neighborhoods attempting to locate a wireless access
point (AP) by using a portable device.
Answer option B is incorrect. Packet sniffing is a process of monitoring data packets that travel
across a network. The software used for packet sniffing is known as sniffers. There are many packetsniffing programs that are available on the Internet. Some of these are unauthorized, which can be
harmful for a network’s security.
Answer option C is incorrect. Packet filtering is a method that allows or restricts the flow of specific
types of packets to provide security. It analyzes the incoming and outgoing packets and lets them
pass or stops them at a network interface based on the source and destination addresses, ports, or
protocols. Packet filtering provides a way to define precisely which type of IP traffic is allowed to
cross the firewall of an intranet. IP packet filtering is important when users from private intranets
connect to public networks, such as the Internet.
Answer option A is incorrect. Back door is a program or account that allows access to a system by
skipping the security checks. Many vendors and developers implement back doors to save time and
effort by skipping the security checks while troubleshooting. Back door is considered to be a security
threat and should be kept with the highest security. If a back door becomes known to attackers and
malicious users, they can use it to exploit the system.