Computer Network Security Services
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Questions and Answers

Security services are intended to enhance the speed of data processing systems.

False

Security mechanisms are used to provide a security service.

True

Authentication is a security service that prevents unauthorized use of a resource.

False

Confidentiality is a security service that protects data from unauthorized modification.

<p>False</p> Signup and view all the answers

Security services are implemented by security mechanisms.

<p>True</p> Signup and view all the answers

X.800 defines a security service as a service that provides a specific kind of speed to a system.

<p>False</p> Signup and view all the answers

Access control is a security service that ensures the integrity of data.

<p>False</p> Signup and view all the answers

Security services are closely related to security mechanisms.

<p>True</p> Signup and view all the answers

Traffic analysis is a type of active attack.

<p>False</p> Signup and view all the answers

Masquerade is a type of passive attack.

<p>False</p> Signup and view all the answers

Security implementation involves four complementary courses of action.

<p>True</p> Signup and view all the answers

Modification of messages is a type of passive attack.

<p>False</p> Signup and view all the answers

Encryption is used for prevention and detection of security threats.

<p>False</p> Signup and view all the answers

Denial of Service is an attack on confidentiality.

<p>False</p> Signup and view all the answers

The use of backup systems is a part of security response.

<p>False</p> Signup and view all the answers

Interception is an attack on integrity.

<p>False</p> Signup and view all the answers

Intrusion detection systems are used to prevent unauthorized access.

<p>False</p> Signup and view all the answers

Fabrication is an attack on integrity.

<p>False</p> Signup and view all the answers

Security implementation involves only three courses of action.

<p>False</p> Signup and view all the answers

Denial of service attacks can be prevented using encryption algorithms.

<p>False</p> Signup and view all the answers

Passive attacks involve modification of the data stream.

<p>False</p> Signup and view all the answers

Security response involves halting an attack and preventing further damage.

<p>True</p> Signup and view all the answers

Replay Attack is a type of passive attack.

<p>False</p> Signup and view all the answers

Encryption is used to respond to security threats.

<p>False</p> Signup and view all the answers

Security recovery involves restoring systems and data after an attack.

<p>True</p> Signup and view all the answers

Prevention is the only course of action in security implementation.

<p>False</p> Signup and view all the answers

The ITU-T standards are referred to as FIPS xxx.

<p>False</p> Signup and view all the answers

The CIA Triad consists of Confidentiality, Integrity, and Availability.

<p>True</p> Signup and view all the answers

Authenticity is a part of the CIA Triad.

<p>False</p> Signup and view all the answers

The main goal of Accountability is to generate the requirement for actions of an entity to be traced uniquely to that entity.

<p>True</p> Signup and view all the answers

NIST is responsible for producing RFCs xxx.

<p>False</p> Signup and view all the answers

The Internet Society (ISOC) produces X 123… Recommendations.

<p>False</p> Signup and view all the answers

Revealing the data only to authorized users is a part of the Integrity requirement.

<p>False</p> Signup and view all the answers

The CIA Triad consists of only three pillars of information security.

<p>False</p> Signup and view all the answers

Countermeasures are used to introduce new vulnerabilities to a system.

<p>False</p> Signup and view all the answers

Corrupted assets are an example of loss of confidentiality.

<p>False</p> Signup and view all the answers

Threats are capable of exploiting vulnerabilities to an asset.

<p>True</p> Signup and view all the answers

Active attacks attempt to learn or make use of information from the system.

<p>False</p> Signup and view all the answers

Passive attacks are easy to detect and prevent.

<p>False</p> Signup and view all the answers

Release of message contents is a type of traffic analysis.

<p>False</p> Signup and view all the answers

Snooping refers to unauthorized access to or modification of data.

<p>False</p> Signup and view all the answers

The goal of countermeasures is to eliminate residual risks to the assets.

<p>False</p> Signup and view all the answers

Study Notes

Security Services

  • Security services are intended to counter security attacks and make use of one or more security mechanisms to provide the service.
  • ITU-T (X.800) provides security services and mechanisms to implement those services.

Security Mechanisms

  • Security mechanisms are used to provide security services.
  • Security services and mechanisms are closely related.

Types of Security Services

  • Authentication: assurance that a communicating entity is the one it claims to be.
  • Access Control: prevention of unauthorized use of a resource.
  • Confidentiality: protection of data from unauthorized disclosure.

Security Implementation

  • Prevention: detection and response to security incidents.
  • Detection: identifying security incidents.
  • Encryption: protection of data in transit and at rest.
  • Access Control: prevention of unauthorized access to resources.

Security Threats

  • Interruption: an asset of the system is destroyed or becomes unavailable.
  • Interception: an unauthorized party gains access to an asset.
  • Modification: an unauthorized party tampers with an asset.
  • Fabrication: an unauthorized party inserts counterfeit objects into the system.

CIA Triad

  • Confidentiality: ensuring that only authorized access to sensitive information.
  • Integrity: ensuring that data and systems are protected from unauthorized modification.
  • Availability: ensuring that systems and data are accessible and usable when needed.

Additional Concepts

  • Authenticity: verifying the identity of users and ensuring the authenticity of data.
  • Accountability: tracing actions to specific entities to ensure accountability.

Security Standardization Organizations

  • International Telecommunication Union - Telecommunication Standardization Sector (ITU-T)
  • National Institute of Standards & Technology (NIST)
  • Internet Society (ISOC)

Security Attacks

  • Passive Attacks: attempts to learn or make use of information from the system but does not affect system resources.
  • Active Attacks: attempts to alter system resources or affect their operation.

Types of Passive Attacks

  • Traffic Analysis: obtaining information by monitoring online traffic.
  • Release of Message Contents (Snooping): unauthorized access to or interception of data.

Active Attacks

  • Masquerade: one entity pretends to be a different entity.
  • Replay Attack: passive capture of a data unit and its subsequent retransmission to produce an unauthorized effect.
  • Modification Attack: alteration of a legitimate message to produce an unauthorized effect.
  • Denial of Service: preventing or inhibiting the normal use or management of communications facilities.

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Description

This quiz covers security services and mechanisms in computer networks, including their relationship and implementation according to ITU-T(X.800) standards.

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