EC0-350 Exam Dumps - Ethical Hacking and Countermeasures V8

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Question # 97

Rebecca has noted multiple entries in her logs about users attempting to connect on ports that are either not opened or ports that are not for public usage. How can she restrict this type of abuse by limiting access to only specific IP addresses that are trusted by using one of the built-in Linux Operating System tools?

Ensure all files have at least a 755 or more restrictive permissions.

Configure rules using ipchains.

Configure and enable portsentry on his server.

Install an intrusion detection system on her computer such as Snort.

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Question # 98

Which one of the following instigates a SYN flood attack?

Generating excessive broadcast packets.

Creating a high number of half-open connections.

Inserting repetitive Internet Relay Chat (IRC) messages.

A large number of Internet Control Message Protocol (ICMP) traces.

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Question # 99

A denial of Service (DoS) attack works on the following principle:

MS-DOS and PC-DOS operating system utilize a weaknesses that can be compromised and permit them to launch an attack easily.

All CLIENT systems have TCP/IP stack implementation weakness that can be compromised and permit them to lunch an attack easily.

Overloaded buffer systems can easily address error conditions and respond appropriately.

Host systems cannot respond to real traffic, if they have an overwhelming number of incomplete connections (SYN/RCVD State).

A server stops accepting connections from certain networks one those network become flooded.

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Question # 100

Under what conditions does a secondary name server request a zone transfer from a primary name server?

When a primary SOA is higher that a secondary SOA

When a secondary SOA is higher that a primary SOA

When a primary name server has had its service restarted

When a secondary name server has had its service restarted

When the TTL falls to zero

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Question # 101

Study the snort rule given below:

From the options below, choose the exploit against which this rule applies.

WebDav

SQL Slammer

MS Blaster

MyDoom

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Question # 102

Sniffing is considered an active attack.

True

False

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Question # 103

Joseph was the Web site administrator for the Mason Insurance in New York, who's main Web site was located at www.masonins.com. Joseph uses his laptop computer regularly to administer the Web site.

One night, Joseph received an urgent phone call from his friend, Smith. According to Smith, the main Mason Insurance web site had been vandalized! All of its normal content was removed and replaced with an attacker's message ''Hacker Message: You are dead! Freaks!

From his office, which was directly connected to Mason Insurance's internal network, Joseph surfed to the Web site using his laptop. In his browser, the Web site looked completely intact. No changes were apparent. Joseph called a friend of his at his home to help troubleshoot the problem. The Web site appeared defaced when his friend visited using his DSL connection. So, while Smith and his friend could see the defaced page, Joseph saw the intact Mason Insurance web site. To help make sense of this problem, Joseph decided to access the Web site using his dial-up ISP. He disconnected his laptop from the corporate internal network and used his modem to dial up the same ISP used by Smith.

After his modem connected, he quickly typed www.masonins.com in his browser to reveal the following web page:

H@cker Mess@ge:

Y0u @re De@d! Fre@ks!

After seeing the defaced Web site, he disconnected his dial-up line, reconnected to the internal network, and used Secure Shell (SSH) to log in directly to the Web server. He ran Tripwire against the entire Web site, and determined that every system file and all the Web content on the server were intact.

How did the attacker accomplish this hack?

ARP spoofing

SQL injection

DNS poisoning

Routing table injection

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