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NEW QUESTION: 1
A. Option C
B. Option E
C. Option B
D. Option D
E. Option A
Answer: E
NEW QUESTION: 2
A network analyst received a number of reports that impersonation was taking place on the network.
Session tokens were deployed to mitigate this issue and defend against the following attacks:
A. DDoS
B. Replay
C. Ping of Death
D. Smurf
Answer: B
Explanation:
Section: Threats and Vulnerabilities
Explanation/Reference:
Explanation:
A replay attack (also known as playback attack) is a form of network attack in which a valid data
transmission is maliciously or fraudulently repeated or delayed. This is carried out either by the originator
or by an adversary who intercepts the data and retransmits it, possibly as part of a masquerade attack by
IP packet substitution (such as stream cipher attack).
For example: Suppose Alice wants to prove her identity to Bob. Bob requests her password as proof of
identity, which Alice dutifully provides (possibly after some transformation like a hash function); meanwhile,
Eve is eavesdropping on the conversation and keeps the password (or the hash). After the interchange is
over, Eve (posing as Alice) connects to Bob; when asked for a proof of identity, Eve sends Alice's
password (or hash) read from the last session, which Bob accepts thus granting access to Eve.
Countermeasures: A way to avoid replay attacks is by using session tokens: Bob sends a one-time token
to Alice, which Alice uses to transform the password and send the result to Bob (e.g. computing a hash
function of the session token appended to the password). On his side Bob performs the same
computation; if and only if both values match, the login is successful. Now suppose Eve has captured this
value and tries to use it on another session; Bob sends a different session token, and when Eve replies
with the captured value it will be different from Bob's computation.
Session tokens should be chosen by a (pseudo-) random process. Otherwise Eve may be able to pose as
Bob, presenting some predicted future token, and convince Alice to use that token in her transformation.
Eve can then replay her reply at a later time (when the previously predicted token is actually presented by
Bob), and Bob will accept the authentication.
One-time passwords are similar to session tokens in that the password expires after it has been used or
after a very short amount of time. They can be used to authenticate individual transactions in addition to
sessions. The technique has been widely implemented in personal online banking systems.
Bob can also send nonces but should then include a message authentication code (MAC), which Alice
should check.
Timestamping is another way of preventing a replay attack. Synchronization should be achieved using a
secure protocol. For example Bob periodically broadcasts the time on his clock together with a MAC. When
Alice wants to send Bob a message, she includes her best estimate of the time on his clock in her
message, which is also authenticated. Bob only accepts messages for which the timestamp is within a
reasonable tolerance. The advantage of this scheme is that Bob does not need to generate (pseudo-)
random numbers, with the trade-off being that replay attacks, if they are performed quickly enough i.e.
within that 'reasonable' limit, could succeed.
NEW QUESTION: 3
You work as a project manager for BlueWell Inc. Which of the following tools/techniques will you use to demonstrate how a process behaves over time, and when a process is subject to special cause variation, resulting in an out-of-control condition?
A. Pareto Chart
B. Scatter Chart
C. Control Chart
D. Ishikawa Diagram
Answer: C
Explanation:
Explanation/Reference:
Explanation:
You should use the control charts to demonstrate how a process behaves over time, and when a process is subject to special cause variation, resulting in an out-of-control condition. Control charts are graphical representations of different processes. These charts contain the maximum and minimum values allowed.
Control charts are used to determine whether or not a process is stable or has predictable performance. A process is considered out of control when a data point exceeds a control limit or if seven consecutive points are above or below the mean.
Incorrect Answers:
A: A Pareto chart is a special type of bar chart where the values being plotted are arranged in descending order. The graph is accompanied by a line graph, which shows the cumulative totals of each category, left to right. The chart is named after Vilfredo Pareto, and its use in quality assurance was popularized by Joseph M. Juran and Kaoru Ishikawa.
B: The Ishikawa diagram (or fishbone diagram or also cause-and-effect diagram) are diagrams, that shows the causes of a certain event. A common use of the Ishikawa diagram is to identify potential factors causing an overall effect. It helps identify causal factors and contributing causes.
It is known as a fishbone diagram because of its shape, similar to the side view of a fish skeleton. It is considered as a basic tool of quality management.
C: A scatter chart is a type of display using Cartesian coordinates to display values for two variables for a set of data. The data is displayed as a collection of points, each having the value of one variable determining the position on the horizontal axis and the value of the other variable determining the position on the vertical axis. A scatter diagram shows the pattern of relationship between two variables. This tool allows the quality team to study and identify the possible relationship between changes observed in two variables. Dependent variables versus independent variables are plotted. The closer the points are to a diagonal line, the more closely they are related.
NEW QUESTION: 4
Given the configuration of RTA below, which of the following description about the configuration is wrong? (Multiple choice)
A. The router listens to the multicast address 224.0.0.2 by default.
B. IGMP version supported by this interface is version 2. If this command is not configured, the interface runs IGMPv1 by default.
C. Use the igmp enable command to enable IGMP on the interface. If you do not configure the multicast routing-enable command first, igmp enable can be used as usual.
D. multicast routing-enable command is to enable multicast. If this command is not configured, the router does not forward multicast packets.
Answer: B,C
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