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SY0-401 Latest Exam (Sep 2017)

[Free] 2017(Sep) EnsurePass Passguide CompTIA SY0-401 Dumps with VCE and PDF 711-720

September 20, 2017

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CompTIA Security Certification

Question No: 711 – (Topic 3)

A trojan was recently discovered on a server. There are now concerns that there has been a security breach that allows unauthorized people to access data. The administrator should be looking for the presence of a/an:

  1. Logic bomb.

  2. Backdoor.

  3. Adware application.

  4. Rootkit.

Answer: B Explanation:

There has been a security breach on a computer system. The security administrator should now check for the existence of a backdoor.

A backdoor in a computer system (or cryptosystem or algorithm) is a method of bypassing normal authentication, securing unauthorized remote access to a computer, obtaining access to plaintext, and so on, while attempting to remain undetected. The backdoor may take the form of an installed program (e.g., Back Orifice) or may subvert the system through a rootkit.

A backdoor in a login system might take the form of a hard coded user and password combination which gives access to the system.

Although the number of backdoors in systems using proprietary software (software whose source code is not publicly available) is not widely credited, they are nevertheless frequently exposed. Programmers have even succeeded in secretly installing large amounts of benign code as Easter eggs in programs, although such cases may involve official forbearance, if not actual permission.

Many computer worms, such as Sobig and Mydoom, install a backdoor on the affected computer (generally a PC on broadband running Microsoft Windows and Microsoft Outlook). Such backdoors appear to be installed so that spammers can send junk e-mail from the infected machines. Others, such as the Sony/BMG rootkit distributed silently on millions of music CDs through late 2005, are intended as DRM measures-and, in that case, as data gathering agents, since both surreptitious programs they installed routinely contacted central servers.

Question No: 712 – (Topic 3)

Which of the following would a security administrator implement in order to identify a problem between two applications that are not communicating properly?

  1. Protocol analyzer

  2. Baseline report

  3. Risk assessment

  4. Vulnerability scan

Answer: A Explanation:

A Protocol Analyzer is a hardware device or more commonly a software program used to capture network data communications sent between devices on a network. Capturing and analyzing the packets sent between applications on systems that are not communicating properly could help determine the cause of the issue.

Well known software protocol analyzers include Message Analyzer (formerly Network Monitor) from Microsoft and Wireshark (formerly Ethereal).

Question No: 713 – (Topic 3)

A security administrator wants to get a real time look at what attackers are doing in the wild, hoping to lower the risk of zero-day attacks. Which of the following should be used to accomplish this goal?

  1. Penetration testing

  2. Honeynets

  3. Vulnerability scanning

  4. Baseline reporting

Answer: B Explanation:

A honeynet is a network set up with intentional vulnerabilities; its purpose is to invite attack, so that an attacker#39;s activities and methods can be studied and that information used to increase network security. A honeynet contains one or more honey pots, which are computer systems on the Internet expressly set up to attract and quot;trapquot; people who attempt to penetrate other people#39;s computer systems. Although the primary purpose of a honeynet is to gather information about attackers#39; methods and motives, the decoy network can benefit its operator in other ways, for example by diverting attackers from a real network and its resources. The Honeynet Project, a non-profit research organization dedicated to computer security and information sharing, actively promotes the deployment of honeynets. In addition to the honey pots, a honeynet usually has real applications and services so that it seems like a normal network and a worthwhile target. However, because the honeynet doesn#39;t actually serve any authorized users, any attempt to contact the network from without is likely an illicit attempt to breach its security, and any outbound activity is likely evidence that a system has been compromised. For this reason, the suspect information is much more apparent than it would be in an actual network, where it would have to be found amidst all the legitimate network data. Applications within a honeynet are often given

names such as quot;Financesquot; or quot;Human Servicesquot; to make them sound appealing to the attacker.

A virtual honeynet is one that, while appearing to be an entire network, resides on a single server.

Question No: 714 – (Topic 3)

A program has been discovered that infects a critical Windows system executable and stays dormant in memory. When a Windows mobile phone is connected to the host, the program infects the phone’s boot loader and continues to target additional Windows PCs or phones. Which of the following malware categories BEST describes this program?

  1. Zero-day

  2. Trojan

  3. Virus

  4. Rootkit

Answer: C Explanation:

A computer virus is a program or piece of code that is loaded onto your computer without your knowledge and runs against your wishes. Viruses can also replicate themselves. All computer viruses are man-made. A simple virus that can make a copy of itself over and over again is relatively easy to produce. Even such a simple virus is dangerous because it will quickly use all available memory and bring the system to a halt. An even more dangerous type of virus is one capable of transmitting itself across networks and bypassing security systems.

Some people distinguish between general viruses and worms. A worm is a special type of virus that can replicate itself and use memory, but cannot attach itself to other programs.

Question No: 715 – (Topic 3)

Joe a company’s new security specialist is assigned a role to conduct monthly vulnerability scans across the network. He notices that the scanner is returning a large amount of false positives or failed audits. Which of the following should Joe recommend to remediate these issues?

  1. Ensure the vulnerability scanner is located in a segmented VLAN that has access to the company’s servers

  2. Ensure the vulnerability scanner is configured to authenticate with a privileged account

  3. Ensure the vulnerability scanner is attempting to exploit the weaknesses it discovers

  4. Ensure the vulnerability scanner is conducting antivirus scanning

Answer: A Explanation:

The vulnerability scanner is returning false positives because it is trying to scan servers that it doesn’t have access to; for example, servers on the Internet.

We need to ensure that the local network servers only are scanned. We can do this by locating the vulnerability scanner in a segmented VLAN that has access to the company’s servers.

A false positive is an error in some evaluation process in which a condition tested for is mistakenly found to have been detected.

In spam filters, for example, a false positive is a legitimate message mistakenly marked as UBE -unsolicited bulk email, as junk email is more formally known. Messages that are determined to be spam – whether correctly or incorrectly – may be rejected by a server or client-side spam filter and returned to the sender as bounce e-mail.

One problem with many spam filtering tools is that if they are configured stringently enough to be effective, there is a fairly high chance of getting false positives. The risk of accidentally blocking an important message has been enough to deter many companies from implementing any anti-spam measures at all.

False positives are also common in security systems. A host intrusion prevention system (HIPS), for example, looks for anomalies, such as deviations in bandwidth, protocols and ports. When activity varies outside of an acceptable range – for example, a remote application attempting to open a normally closed port – an intrusion may be in progress. However, an anomaly, such as a sudden spike in bandwidth use, does not guarantee an actual attack, so this approach amounts to an educated guess and the chance for false positives can be high.

False positives contrast with false negatives, which are results indicating mistakenly that some condition tested for is absent.

Question No: 716 – (Topic 3)

Which statement is TRUE about the operation of a packet sniffer?

  1. It can only have one interface on a management network.

  2. They are required for firewall operation and stateful inspection.

  3. The Ethernet card must be placed in promiscuous mode.

  4. It must be placed on a single virtual LAN interface.

Answer: C Explanation:

A sniffer (packet sniffer) is a tool that intercepts data flowing in a network. If computers are connected to a local area network that is not filtered or switched, the traffic can be broadcast to all computers contained in the same segment. This doesn’t generally occur, since computers are generally told to ignore all the comings and goings of traffic from other computers. However, in the case of a sniffer, all traffic is shared when the sniffer software commands the Network Interface Card (NIC) to stop ignoring the traffic. The NIC is put into promiscuous mode, and it reads communications between computers within a particular segment. This allows the sniffer to seize everything that is flowing in the network, which can lead to the unauthorized access of sensitive data. A packet sniffer can take the form of either a hardware or software solution. A sniffer is also known as a packet analyzer.

Question No: 717 – (Topic 3)

An internal audit has detected that a number of archived tapes are missing from secured storage. There was no recent need for restoration of data from the missing tapes. The location is monitored by access control and CCTV systems. Review of the CCTV system indicates that it has not been recording for three months. The access control system shows numerous valid entries into the storage location during that time. The last audit was six months ago and the tapes were accounted for at that time. Which of the following could have aided the investigation?

  1. Testing controls

  2. Risk assessment

  3. Signed AUP

  4. Routine audits

Answer: A Explanation:

Testing controls come in three types: Technical, Management and Operational.

In this question, the CCTV system has not been recording for three months and no one noticed. Improved testing controls (regular testing to verify the CCTV system is recording) would ensure that the CCTV is recording as expected.

The CCTV recordings could have aided the investigation into the missing tapes.

Question No: 718 – (Topic 3)

A server administrator notes that a legacy application often stops running due to a memory error. When reviewing the debugging logs, they notice code being run calling an internal process to exploit the machine. Which of the following attacks does this describe?

  1. Zero-day

  2. Buffer overflow

  3. Cross site scripting

  4. Malicious add-on

Answer: B Explanation:

This question describes a buffer overflow attack.

A buffer overflow occurs when a program or process tries to store more data in a buffer (temporary data storage area) than it was intended to hold. Since buffers are created to contain a finite amount of data, the extra information – which has to go somewhere – can overflow into adjacent buffers, corrupting or overwriting the valid data held in them.

Although it may occur accidentally through programming error, buffer overflow is an increasingly common type of security attack on data integrity. In buffer overflow attacks, the extra data may contain codes designed to trigger specific actions, in effect sending new instructions to the attacked computer that could, for example, damage the user#39;s files, change data, or disclose confidential information. Buffer overflow attacks are said to have arisen because the C programming language supplied the framework, and poor programming practices supplied the vulnerability.

Question No: 719 – (Topic 3)

Users are encouraged to click on a link in an email to obtain exclusive access to the newest version of a popular Smartphone. This is an example of.

  1. Scarcity

  2. Familiarity

  3. Intimidation

  4. Trust

Answer: A Explanation:

Scarcity, in the area of social psychology, works much like scarcity in the area of economics. Simply put, humans place a higher value on an object that is scarce, and a lower value on those that are abundant. The thought that we, as humans, want something we cannot have drives us to desire the object even more. This idea is deeply embedded in the intensely popular, “Black Friday” shopping extravaganza that U.S. consumers participate in every year on the day after Thanksgiving. More than getting a bargain on a hot gift idea, shoppers thrive on the competition itself, in obtaining the scarce product.

In this question, people want the brand new latest version of a smartphone. The temptation of being one of the first to get the new phone will tempt people into clicking the link in the email.

Question No: 720 – (Topic 3)

A large multinational corporation with networks in 30 countries wants to establish an understanding of their overall public-facing network attack surface. Which of the following security techniques would be BEST suited for this?

  1. External penetration test

  2. Internal vulnerability scan

  3. External vulnerability scan

  4. Internal penetration test

Answer: C Explanation:

In this question, we need to determine the public-facing network attack surface. We therefore need to perform a vulnerability scan from outside the network; in other words, an external vulnerability scan.

A vulnerability scan is the automated process of proactively identifying security vulnerabilities of computing systems in a network in order to determine if and where a system can be exploited and/or threatened. While public servers are important for communication and data transfer over the Internet, they open the door to potential security breaches by threat agents, such as malicious hackers.

Vulnerability scanning employs software that seeks out security flaws based on a database

of known flaws, testing systems for the occurrence of these flaws and generating a report of the findings that an individual or an enterprise can use to tighten the network#39;s security. Vulnerability scanning typically refers to the scanning of systems that are connected to the Internet but can also refer to system audits on internal networks that are not connected to the Internet in order to assess the threat of rogue software or malicious employees in an enterprise.

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