Question 106
Firewalking is a technique that can be used to gather information about a remote network protected by a firewall. This technique can be used effectively to perform information gathering attacks. In this technique, an attacker sends a crafted packet with a TTL value that is set to expire one hop past the firewall. Which of the following are pre-requisites for an attacker to conduct firewalking?
Each correct answer represents a complete solution. Choose all that apply.
Question 107
You work as a Network Administrator for Tech Perfect Inc. The company has a TCP/IP-based network. An attacker uses software that keeps trying password combinations until the correct password is found. Which type of attack is this?
Question 108
Adam, a novice computer user, works primarily from home as a medical professional. He just bought a brand new
Dual Core Pentium computer with over 3 GB of RAM. After about two months of working on his new computer, he
notices that it is not running nearly as fast as it used to. Adam uses antivirus software, anti-spyware software, and
keeps the computer up-to-date with Microsoft patches. After another month of working on the computer, Adam finds
that his computer is even more noticeably slow. He also notices a window or two pop-up on his screen, but they
quickly disappear. He has seen these windows show up, even when he has not been on the Internet. Adam notices
that his computer only has about 10 GB of free space available. Since his hard drive is a 200 GB hard drive, Adam
thinks this is very odd.
Which of the following is the mostly likely the cause of the problem?
Question 109
Which of the following is a network worm that exploits the RPC sub-system vulnerability present in the Microsoft Windows operating system?
Question 110
Your network is being flooded by ICMP packets. When you trace them down they come from multiple different IP addresses. What kind of attack is this?