[Free] 2018(Jan) EnsurePass Dumpsleader ECCouncil EC0-350 Dumps with VCE and PDF 71-80

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Ethical Hacking and Countermeasures V8

Question No: 71 – (Topic 1)

What are the limitations of Vulnerability scanners? (Select 2 answers)

  1. There are often better at detecting well-known vulnerabilities than more esoteric ones

  2. The scanning speed of their scanners are extremely high

  3. It is impossible for any, one scanning product to incorporate all known vulnerabilities in a timely manner

  4. The more vulnerabilities detected, the more tests required

  5. They are highly expensive and require per host scan license

Answer: A,C

Question No: 72 – (Topic 1)

An attacker has successfully compromised a remote computer. Which of the following comes as one of the last steps that should be taken to ensure that the compromise cannot be traced back to the source of the problem?

  1. Install patches

  2. Setup a backdoor

  3. Install a zombie for DDOS

  4. Cover your tracks

Answer: D

Question No: 73 – (Topic 1)

Samuel is the network administrator of DataX Communications, Inc. He is trying to configure his firewall to block password brute force attempts on his network. He enables blocking the intruder#39;s IP address for a period of 24 hours#39; time after more than three unsuccessful attempts. He is confident that this rule will secure his network from hackers on the Internet.

But he still receives hundreds of thousands brute-force attempts generated from various IP addresses around the world. After some investigation he realizes that the intruders are using a proxy somewhere else on the Internet which has been scripted to enable the random usage of various proxies on each request so as not to get caught by the firewall rule.

Later he adds another rule to his firewall and enables small sleep on the password attempt so that if the password is incorrect, it would take 45 seconds to return to the user to begin another attempt. Since an intruder may use multiple machines to brute force the password, he also throttles the number of connections that will be prepared to accept from a particular IP address. This action will slow the intruder#39;s attempts.

Samuel wants to completely block hackers brute force attempts on his network.

What are the alternatives to defending against possible brute-force password attacks on his site?

  1. Enforce a password policy and use account lockouts after three wrong logon attempts even though this might lock out legit users

  2. Enable the IDS to monitor the intrusion attempts and alert you by e-mail about the IP address of the intruder so that you can block them at the

    Firewall manually

  3. Enforce complex password policy on your network so that passwords are more difficult to brute force

  4. You cannot completely block the intruders attempt if they constantly switch proxies

Answer: D

Question No: 74 – (Topic 1)

You are the security administrator of Jaco Banking Systems located in Boston. You are setting up e-banking website (http://www.ejacobank.com) authentication system. Instead of issuing banking customer with a single password, you give them a printed list of 100 unique passwords. Each time the customer needs to log into the e-banking system website, the customer enters the next password on the list. If someone sees them type the password

using shoulder surfing, MiTM or keyloggers, then no damage is done because the password will not be accepted a second time. Once the list of 100 passwords is almost finished, the system automatically sends out a new password list by encrypted e-mail to the customer.

You are confident that this security implementation will protect the customer from password abuse.

Two months later, a group of hackers called quot;HackJihadquot; found a way to access the one- time password list issued to customers of Jaco Banking Systems. The hackers set up a fake website (http://www.e-jacobank.com) and used phishing attacks to direct ignorant customers to it. The fake website asked users for their e-banking username and password, and the next unused entry from their one-time password sheet. The hackers collected 200 customer#39;s username/passwords this way. They transferred money from the customer#39;s bank account to various offshore accounts.

Your decision of password policy implementation has cost the bank with USD 925, 000 to hackers. You immediately shut down the e-banking website while figuring out the next best security solution

What effective security solution will you recommend in this case?

  1. Implement Biometrics based password authentication system. Record the customers face image to the authentication database

  2. Configure your firewall to block logon attempts of more than three wrong tries

  3. Enable a complex password policy of 20 characters and ask the user to change the password immediately after they logon and do not store password histories

  4. Implement RSA SecureID based authentication system

Answer: D

Question No: 75 – (Topic 1)

How does traceroute map the route a packet travels from point A to point B?

  1. Uses a TCP timestamp packet that will elicit a time exceeded in transit message

  2. Manipulates the value of the time to live (TTL) within packet to elicit a time exceeded in transit message

  3. Uses a protocol that will be rejected by gateways on its way to the destination

  4. Manipulates the flags within packets to force gateways into generating error messages

Answer: B Explanation:

Traceroute works by increasing the quot;time-to-livequot; value of each successive batch of packets sent. The first three packets have a time-to-live (TTL) value of one (implying that they make a single hop). The next three packets have a TTL value of 2, and so on. When a packet passes through a host, normally the host decrements the TTL value by one, and forwards the packet to the next host. When a packet with a TTL of one reaches a host, the host discards the packet and sends an ICMP time exceeded (type 11) packet to the sender. The traceroute utility uses these returning packets to produce a list of hosts that the packets have traversed en route to the destination.

Question No: 76 – (Topic 1)

If a competitor wants to cause damage to your organization, steal critical secrets, or put you out of business, they just have to find a job opening, prepare someone to pass the interview, have that person hired, and they will be in the organization.

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How would you prevent such type of attacks?

  1. It is impossible to block these attacks

  2. Hire the people through third-party job agencies who will vet them for you

  3. Conduct thorough background checks before you engage them

  4. Investigate their social networking profiles

Answer: C

Question No: 77 – (Topic 1)

Vulnerability scanners are automated tools that are used to identify vulnerabilities and misconfigurations of hosts. They also provide information regarding mitigating discovered


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Which of the following statements is incorrect?

  1. Vulnerability scanners attempt to identify vulnerabilities in the hosts scanned.

  2. Vulnerability scanners can help identify out-of-date software versions, missing patches, or system upgrades

  3. They can validate compliance with or deviations from the organization#39;s security policy

  4. Vulnerability scanners can identify weakness and automatically fix and patch the vulnerabilities without user intervention

Answer: D

Question No: 78 – (Topic 1)

Consider the following code:

URL:http://www.certified.com/search.pl? text=lt;scriptgt;alert(document.cookie)lt;/scriptgt;

If an attacker can trick a victim user to click a link like this, and the Web application does not validate input, then the victim#39;s browser will pop up an alert showing the users current set of cookies. An attacker can do much more damage, including stealing passwords, resetting your home page, or redirecting the user to another Web site.

What is the countermeasure against XSS scripting?

  1. Create an IP access list and restrict connections based on port number

  2. Replace quot;lt;quot; and quot;gt;quot; characters with quot;amp; l t;quot; and quot;amp; g t;quot; using server scripts

  3. Disable Javascript in IE and Firefox browsers

  4. Connect to the server using HTTPS protocol instead of HTTP

Answer: B

Question No: 79 – (Topic 1)

The SYN flood attack sends TCP connections requests faster than a machine can process them.

->Attacker creates a random source address for each packet

->SYN flag set in each packet is a request to open a new connection to the server from the spoofed IP address

->Victim responds to spoofed IP address, then waits for confirmation that never arrives (timeout wait is about 3 minutes)

->Victim#39;s connection table fills up waiting for replies and ignores new connections

->Legitimate users are ignored and will not be able to access the server

How do you protect your network against SYN Flood attacks?

  1. SYN cookies. Instead of allocating a record, send a SYN-ACK with a carefully constructed sequence number generated as a hash of the clients IP address, port number, and other information. When the client responds with a normal ACK, that special sequence number will be included, which the server then verifies. Thus, the server first allocates memory on the third packet of the handshake, not the first.

  2. RST cookies – The server sends a wrong SYN/ACK back to the client. The client should then generate a RST packet telling the server that something is wrong. At this point, the server knows the client is valid and will now accept incoming connections from that client normally

  3. Check the incoming packet#39;s IP address with the SPAM database on the Internet and enable the filter using ACLs at the Firewall

  4. Stack Tweaking. TCP stacks can be tweaked in order to reduce the effect of SYN floods. Reduce the timeout before a stack frees up the memory allocated for a connection

  5. Micro Blocks. Instead of allocating a complete connection, simply allocate a micro record of 16-bytes for the incoming SYN object

Answer: A,B,D,E

Question No: 80 – (Topic 1)

What is the problem with this ASP script (login.asp)?

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  1. The ASP script is vulnerable to Cross Site Scripting attack

  2. The ASP script is vulnerable to Session Splice attack

  3. The ASP script is vulnerable to XSS attack

  4. The ASP script is vulnerable to SQL Injection attack

Answer: D

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