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NEW QUESTION: 1
Your network is suffering from regular outages. After troubleshooting, you learn that the transmit lead of a fiber uplink was damaged. Which two features can prevent the same issues in the future? (Choose two.)
A. BPDU skew detection
B. BPDU guard
C. UDLD
D. loop guard
E. root guard
Answer: C,D
Explanation:
STP Loop Guard The STP loop guard feature provides additional protection against Layer 2 forwarding loops (STP loops). An STP loop is created when an STP blocking port in a redundant topology erroneously transitions to the forwarding state. This usually happens because one of the ports of a physically redundant topology (not necessarily the STP blocking port) no longer receives STP BPDUs. In its operation, STP relies on continuous reception or transmission of BPDUs based on the port role. The designated port transmits BPDUs, and the non-designated port receives BPDUs. When one of the ports in a physically redundant topology no longer receives BPDUs, the STP conceives that the topology is loop free. Eventually, the blocking port from the alternate or backup port becomes designated and moves to a forwarding state. This situation creates a loop. The loop guard feature makes additional checks. If BPDUs are not received on a non-designated port, and loop guard is enabled, that port is moved into the STP loop-inconsistent blocking state, instead of the listening / learning / forwarding state. Without the loop guard feature, the port assumes the designated port role. The port moves to the STP forwarding state and creates a loop.
Loop Guard versus UDLD Loop guard and Unidirectional Link Detection (UDLD) functionality overlap, partly in the sense that both protect against STP failures caused by unidirectional links. However, these two features differ in functionality and how they approach the problem. This table describes loop guard and UDLD functionality: Based on the various design considerations, you can choose either UDLD or the loop guard feature. In regards to STP, the most noticeable difference between the two features is the absence of protection in UDLD against STP failures caused by problems in software. As a result, the designated switch does not send BPDUs. However, this type of failure is (by an order of magnitude) more rare than failures caused by unidirectional links. In return, UDLD might be more flexible in the case of unidirectional links on EtherChannel. In this case, UDLD disables only failed links, and the channel should remain functional with the links that remain. In such a failure, the loop guard puts it into loop-inconsistent state in order to block the whole channel.
Additionally, loop guard does not work on shared links or in situations where the link has been unidirectional since the link-up. In the last case, the port never receives BPDU and becomes designated. Because this behavior could be normal, this particular case is not covered by loop guard. UDLD provides protection against such a scenario. As described, the highest level of protection is provided when you enable UDLD and loop guard.
Reference http://www.cisco.com/en/US/tech/tk389/tk621/technologies_tech_note09186a0080094640. shtml#loop_guard_vs_uld
NEW QUESTION: 2
A security auditor is reviewing the following output from file integrity monitoring software installed on a very busy server at a large service provider. The server has not been updates since it was installed. Drag and drop the log entry that identifies the first instance of server compromise.
Answer:
Explanation:
NEW QUESTION: 3
Which of the following was the first mathematical model of a multilevel security policy used to define the concepts of a security state and mode of access, and to outline rules of access?
A. Bell-LaPadula
B. Biba
C. State machine
D. Clark-Wilson
Answer: A
Explanation:
This is a formal definition of the Bell-LaPadula model, which was created and implemented to protect confidential government and military information.
In the 1970s, the U.S. military used time-sharing mainframe systems and was concerned about the security of these systems and leakage of classified information. The Bell-
LaPadula model was developed to address these concerns.
It was the first mathematical model of a multilevel security policy used to define the concept of a secure state machine and modes of access, and outlined rules of access. Its development was funded by the U.S. government to provide a framework for computer systems that would be used to store and process sensitive information.
The model's main goal was to prevent secret information from being accessed in an unauthorized manner. A system that employs the Bell-LaPadula model is called a multilevel security system because users with different clearances use the system , and the system processes data at different classification levels.
The level at which information is classified determines the handling procedures that should be used. The Bell-LaPadula model is a state machine model that enforces the confidentiality aspects of access control. A matrix and security levels are used to determine if subjects can access different objects. The subject's clearance is compared to the object's classification and then specific rules are applied to control how subject-to-object interactions can take place.
The following answers are incorrect:
Biba - The Biba model was developed after the Bell -LaPadula model. It is a state machine model similar to the Bell-LaPadula model. Biba addresses the integrity of data within applications. The Bell-LaPadula model uses a lattice of security levels (top secret, secret, sensitive, and so on). These security levels were developed mainly to ensure that sensitive data were only available to authorized individuals. The Biba model is not concerned with security levels and confidentiality, so it does not base access decisions upon this type of lattice. Instead, the Biba model uses a lattice of integrity levels.
Clark-Wilson - When an application uses the Clark -Wilson model, it separates data into one subset that needs to be highly protected, which is referred to as a constrained data item (CDI), and another subset that does not require a high level of protection, which is called an unconstrained data item (UDI). Users cannot modify critical data (CDI) directly.
Instead, the subject (user) must be authenticated to a piece of software, and the software procedures (TPs) will carry out the operations on behalf of the user. For example, when
Kathy needs to update information held within her company's database, she will not be allowed to do so without a piece of software controlling these activities. First, Kathy must authenticate to a program, which is acting as a front end for the database, and then the program will control what Kathy can and cannot do to the information in the database. This is referred to as access triple: subject (user), program (TP), and object (CDI). A user cannot modify CDI without using a TP.
State machine - In state machine models, to verify the security of a system, the state is used , which means that all current permissions and all current instances of subjects accessing objects must be captured. Maintaining the state of a system deals with each subject's association with objects. If the subjects can access objects only by means that are concurrent with the security policy, the system is secure. A state of a system is a snapshot of a system at one moment of time. Many activities can alter this state, which are referred to as state transitions. The developers of an operating system that will implement the state machine model need to look at all the different state transitions that are possible and assess whether a system that starts up in a secure state can be put into an insecure state by any of these events. If all of the activities that are allowed to happen in the system do not compromise the system and put it into an insecure state, then the system executes a secure state machine model.
The following reference(s) were/was used to create this question:
Harris, Shon (2012-10-18). CISSP All-in-One Exam Guide, 6th Edition (p. 369, 372-374,
367). McGraw-Hill . Kindle Edition.