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Exam Code: SY0-401Exam Name: CompTIA Security+ Certification
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SY0-401 Dumps PDF Total Q&A: 1750 Questions and Answers
Last Update: 12-29,2015
SY0-401 Bootcamp Detail: SY0-401 Dumps PDF
NO.1 Digital certificates can be used to ensure which of the following? (Select TWO).
A. Non-repudiation
B. Availability
C. Confidentiality
D. Authorization
E. Verification
Answer: A,C
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Explanation:
Digital Signatures is used to validate the integrity of the message and the sender. Digital certificates
refer to cryptography which is mainly concerned with Confidentiality, Integrity, Authentication,
Nonrepudiation and Access Control. Nonrepudiation prevents one party from denying actions they
carried out.
NO.2 An administrator is configuring a new Linux web server where each user account is confined to
a cheroot jail. Which of the following describes this type of control?
A. Segmentation
B. Sandbox
C. SysV
D. Zone
Answer: B
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NO.3 Matt, the Chief Information Security Officer (CISO), tells the network administrator that a
security company has been hired to perform a penetration test against his network. The security
company asks Matt which type of testing would be most beneficial for him. Which of the following
BEST describes what the security company might do during a black box test?
A. The security company is provided with limited information on the network, including all network
diagrams.
B. The security company is provided with no information about the corporate network or physical
locations.
C. The security company is provided with limited information on the network, including some subnet
ranges and logical network diagrams.
D. The security company is provided with all network ranges, security devices in place, and logical
maps of the network.
Answer: B
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Explanation:
The term black box testing is generally associated with application testing. However, in this question
the term is used for network testing. Black box testing means testing something when you have no
knowledge of the inner workings.
Black-box testing is a method of software testing that examines the functionality of an application
without peering into its internal structures or workings. This method of test can be applied to
virtually every level of software testing: unit, integration, system and acceptance. It typically
comprises most if not all higher level testing, but can also dominate unit testing as well. Specific
knowledge of the application's code/internal structure and programming knowledge in general is not
required. The tester is aware of what the software is supposed to do but is not aware of how it does
it. For instance, the tester is aware that a particular input returns a certain, invariable output but is
not aware of how the software produces the output in the first place.
NO.4 Which statement is TRUE about the operation of a packet sniffer?
A. The Ethernet card must be placed in promiscuous mode.
B. It can only have one interface on a management network.
C. It must be placed on a single virtual LAN interface.
D. They are required for firewall operation and stateful inspection.
Answer: A
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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.
NO.5 Which of the following is true about an email that was signed by User A and sent to User B?
A. User A signed with User B's public key and User B verified with their own private key.
B. User A signed with their own public key and User B verified with User A's private key.
C. User A signed with their own private key and User B verified with User A's public key.
D. User A signed with User B's private key and User B verified with their own public key.
Answer: C
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Explanation:
The sender uses his private key, in this case User A's private key, to create a digital signature.
The message is, in effect, signed with the private key. The sender then sends the message to the
receiver. The receiver (User B) uses the public key attached to the message to validate the digital
signature. If the values match, the receiver knows the message is authentic.
The receiver uses a key provided by the sender-the public key-to decrypt the message.
NO.6 Which of the following provides data the best fault tolerance at the LOWEST cost?
A. Clustering
B. RAID 6
C. Server virtualization
D. Load balancing
Answer: B
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Explanation:
RAID, or redundant array of independent disks (RAID). RAID allows your existing servers to have more
than one hard drive so that if the main hard drive fails, the system keeps functioning. RAID can
achieve fault tolerance using software which can be done using the existing hardware and software
thus representing the lowest cost option.
NO.7 Matt, a systems security engineer, is determining which credential-type authentication to use
within a planned 802.1x deployment. He is looking for a method that does not require a client
certificate, has a server side certificate, and uses TLS tunnels for encryption. Which credential type
authentication method BEST fits these requirements?
A. PEAP-CHAP
B. PEAP-MSCHAPv2
C. EAP-TLS
D. EAP-FAST
Answer: B
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Explanation:
PEAP-MS-CHAP v2 is easier to deploy than EAP-TLS or PEAP-TLS because user authentication is
accomplished via password-base credentials (user name and password) rather than digital certificates
or smart cards. Only servers running Network Policy Server (NPS) or PEAP-MS-CHAP v2 are required
to have a certificate.
NO.8 DRAG DROP
A forensic analyst is asked to respond to an ongoing network attack on a server. Place the items in
the list below in the correct order in which the forensic analyst should preserve them.
Answer:
Explanation:
When dealing with multiple issues, address them in order of volatility (OOV); always deal with the
most volatile first. Volatility can be thought of as the amount of time that you have to collect certain
data before a window of opportunity is gone. Naturally, in an investigation you want to collect
everything, but some data will exist longer than others, and you cannot possibly collect all of it
once. As an example, the OOV in an investigation may be RAM, hard drive data, CDs/DVDs, and
printouts.
Order of volatility: Capture system images as a snapshot of what exists, look at network traffic and
logs, capture any relevant video/screenshots/hashes, record time offset on the systems, talk to
witnesses, and track total man-hours and expenses associated with the investigation.
References:
Dulaney, Emmett and Chuck Eastton, CompTIA Security+ Study Guide, 6th Edition, Sybex,
Indianapolis, 2014, p. 453
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