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Q81. A computer is found to be infected with malware and a technician re-installs the operating system. The computer remains infected with malware. This is an example of:
A. a rootkit.
B. a MBR infection.
C. an exploit kit.
D. Spyware.
Answer: B
Explanation:
Q82. A user has plugged in a wireless router from home with default configurations into a network jack at the office. This is known as:
A. an evil twin.
B. an IV attack.
C. a rogue access point.
D. an unauthorized entry point.
Answer: C
Explanation:
Q83. The security officer is preparing a read-only USB stick with a document of important personal phone numbers, vendor contacts, an MD5 program, and other tools to provide to employees. At which of the following points in an incident should the officer instruct employees to use this information?
A. Business Impact Analysis
B. First Responder
C. Damage and Loss Control
D. Contingency Planning
Answer: B
Explanation:
Incident response procedures involves: Preparation; Incident identification; Escalation and notification; Mitigation steps; Lessons learned; Reporting; Recover/reconstitution procedures; First responder; Incident isolation (Quarantine; Device removal); Data breach; Damage and loss control. In this scenario the security officer is carrying out an incident response measure that will address and be of benefit to those in the vanguard, i.e. the employees and they are the first responders.
Q84. Mike, a network administrator, has been asked to passively monitor network traffic to the company’s sales websites. Which of the following would be BEST suited for this task?
A. HIDS
B. Firewall
C. NIPS
D. Spam filter
Answer: C
Explanation:
Network-based intrusion prevention system (NIPS) monitors the entire network for suspicious traffic by analyzing protocol activity.
Q85. Which of the following authentication services requires the use of a ticket-granting ticket (TGT) server in order to complete the authentication process?
A. TACACS+
B. Secure LDAP
C. RADIUS
D. Kerberos
Answer: D
Explanation:
The basic process of Kerberos authentication is as follows:
The subject provides logon credentials.
The Kerberos client system encrypts the password and transmits the protected credentials to the
KDC.
The KDC verifies the credentials and then creates a ticket-granting ticket (TGT—a hashed form of
the subject’s password with the addition of a time stamp that indicates a valid lifetime). The TGT is
encrypted and sent to the client.
The client receives the TGT. At this point, the subject is an authenticated principle in the Kerberos
realm.
The subject requests access to resources on a network server. This causes the client to request a
service ticket (ST) from the KDC.
The KDC verifies that the client has a valid TGT and then issues an ST to the client. The ST
includes a time stamp that indicates its valid lifetime.
The client receives the ST.
The client sends the ST to the network server that hosts the desired resource.
The network server verifies the ST. If it’s verified, it initiates a communication session with the
client. From this point forward, Kerberos is no longer involved.
Improved SY0-401 free practice exam:
Q86. Which of the following BEST describes the weakness in WEP encryption?
A. The initialization vector of WEP uses a crack-able RC4 encryption algorithm.
Once enough packets are captured an XOR operation can be performed and the asymmetric keys
can be derived.
B. The WEP key is stored in plain text and split in portions across 224 packets of random data.
Once enough packets are sniffed the IV portion of the packets can be removed leaving the plain
text key.
C. The WEP key has a weak MD4 hashing algorithm used.
A simple rainbow table can be used to generate key possibilities due to MD4 collisions.
D. The WEP key is stored with a very small pool of random numbers to make the cipher text.
As the random numbers are often reused it becomes easy to derive the remaining WEP key.
Answer: D
Explanation:
WEP is based on RC4, but due to errors in design and implementation, WEP is weak in a number of areas, two of which are the use of a static common key and poor implementation of initiation vectors (IVs). When the WEP key is discovered, the attacker can join the network and then listen in on all other wireless client communications.
Q87. An organization must implement controls to protect the confidentiality of its most sensitive data. The company is currently using a central storage system and group based access control for its sensitive information. Which of the following controls can further secure the data in the central storage system?
A. Data encryption
B. Patching the system
C. Digital signatures
D. File hashing
Answer: A
Explanation:
Q88. Which of the following is a security benefit of providing additional HVAC capacity or increased tonnage in a datacenter?
A. Increased availability of network services due to higher throughput
B. Longer MTBF of hardware due to lower operating temperatures
C. Higher data integrity due to more efficient SSD cooling
D. Longer UPS run time due to increased airflow
Answer: B
Explanation:
The mean time between failures (MTBF) is the measure of the anticipated incidence of failure for a system or component. This measurement determines the component’s anticipated lifetime. If the MTBF of a cooling system is one year, you can anticipate that the system will last for a one-year period; this means that you should be prepared to replace or rebuild the system once a year. If the system lasts longer than the MTBF, your organization receives a bonus. MTBF is helpful in evaluating a system’s reliability and life expectancy. Thus longer MTBF due to lower operating temperatures is a definite advantage
Q89. Joe, the system administrator, is performing an overnight system refresh of hundreds of user computers. The refresh has a strict timeframe and must have zero downtime during business hours. Which of the following should Joe take into consideration?
A. A disk-based image of every computer as they are being replaced.
B. A plan that skips every other replaced computer to limit the area of affected users.
C. An offsite contingency server farm that can act as a warm site should any issues appear.
D. A back-out strategy planned out anticipating any unforeseen problems that may arise.
Answer: D
Explanation:
A backout is a reversion from a change that had negative consequences. It could be, for example, that everything was working fine until you installed a service pack on a production machine, and then services that were normally available were no longer accessible. The backout, in this instance, would revert the system to the state that it was in before the service pack was applied. Backout plans can include uninstalling service packs, hotfixes, and patches, but they can also include reversing a migration and using previous firmware. A key component to creating such a plan is identifying what events will trigger your implementing the backout.
Q90. A system security analyst using an enterprise monitoring tool notices an unknown internal host exfiltrating files to several foreign IP addresses. Which of the following would be an appropriate mitigation technique?
A. Disabling unnecessary accounts
B. Rogue machine detection
C. Encrypting sensitive files
D. Implementing antivirus
Answer: B
Explanation:
Rogue machine detection is the process of detecting devices on the network that should not be there. If a user brings in a laptop and plugs it into the network, the laptop is a “rogue machine”. The laptop could cause problems on the network. Any device on the network that should not be there is classed as rogue.