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NEW QUESTION: 1
Which three statements are typical characteristics of VLAN arrangements? (Choose three.)
A. VLANs cannot span multiple switches.
B. A switch maintains a separate bridging table for each VLAN.
C. VLANs typically decrease the number of collision domains.
D. Each VLAN uses a separate address space.
E. A new switch has no VLANs configured.
F. Connectivity between VLANs requires a Layer 3 device.
Answer: B,D,F
Explanation:
By default, all ports on a new switch belong to VLAN 1 (default & native VLAN). There are also some well-known VLANs (for example: VLAN 1002 for fddi-default; VLAN 1003 for token-ring...) configured by default -> A is not correct.
To communicate between two different VLANs we need to use a Layer 3 device like router or Layer 3 switch -> B is correct.
VLANs don't affect the number of collision domains, they are the same -> C is not correct.
Typically, VLANs increase the number of broadcast domains.We must use a different network (or sub-network) for each VLAN. For example we can use 192.168.1.0/24 for
VLAN 1, 192.168.2.0/24 for VLAN 2 -> D is correct.
A switch maintains a separate bridging table for each VLAN so that it can send frame to ports on the same VLAN only. For example, if a PC in VLAN 2 sends a frame then the switch look-ups its bridging table and only sends frame out of its ports which belong to
VLAN 2 (it also sends this frame on trunk ports) -> E is correct.
We can use multiple switches to expand VLAN -> F is not correct.
NEW QUESTION: 2
Which is NOT a valid type of life event?
A. Explicit
B. Unrestricted
C. Scheduled
D. Restricted
E. Temporal
Answer: D
Explanation:
Explanation
https://docs.oracle.com/cloud/farel12/globalcs_gs/FACMB/FACMB1479189.htm#FACMB1229710
NEW QUESTION: 3
If an operating system permits shared resources such as memory to be used sequentially by multiple users/application or subjects without a refresh of the objects/memory area, what security problem is MOST likely to exist?
A. Denial of service through a deadly embrace.
B. Disclosure of residual data.
C. Unauthorized obtaining of a privileged execution state.
D. Data leakage through covert channels.
Answer: B
Explanation:
Allowing objects to be used sequentially by multiple users without a refresh of the objects can lead to disclosure of residual data. It is important that steps be taken to eliminate the chance for the disclosure of residual data.
Object reuse refers to the allocation or reallocation of system resources to a user or, more appropriately, to an application or process. Applications and services on a computer system may create or use objects in memory and in storage to perform programmatic functions. In some cases, it is necessary to share these resources between various system applications. However, some objects may be employed by an application to perform privileged tasks on behalf of an authorized user or upstream application. If object usage is not controlled or the data in those objects is not erased after use, they may become available to unauthorized users or processes.
Disclosure of residual data and Unauthorized obtaining of a privileged execution state are both a
problem with shared memory and resources. Not clearing the heap/stack can result in residual
data and may also allow the user to step on somebody's session if the security token/identify was
maintained in that space. This is generally more malicious and intentional than accidental though.
The MOST common issue would be Disclosure of residual data.
The following answers are incorrect:
Unauthorized obtaining of a privileged execution state. Is incorrect because this is not a problem
with Object Reuse.
Data leakage through covert channels. Is incorrect because it is not the best answer. A covert
channel is a communication path. Data leakage would not be a problem created by Object Reuse.
In computer security, a covert channel is a type of computer security attack that creates a
capability to transfer information objects between processes that are not supposed to be allowed
to communicate by the computer security policy. The term, originated in 1973 by Lampson is
defined as "(channels) not intended for information transfer at all, such as the service program's
effect on system load." to distinguish it from Legitimate channels that are subjected to access
controls by COMPUSEC.
Denial of service through a deadly embrace. Is incorrect because it is only a detractor.
References:
Hernandez CISSP, Steven (2012-12-21). Official (ISC)2 Guide to the CISSP CBK, Third Edition
((ISC)2 Press) (Kindle Locations 4174-4179). Auerbach Publications. Kindle Edition.
and
https://www.fas.org/irp/nsa/rainbow/tg018.htm
and
http://en.wikipedia.org/wiki/Covert_channel
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