This document discusses communication in distributed systems. It begins with an introduction that describes how distributed computing will be central to many critical applications but also faces challenges around reliability and scalability. The document then covers communication protocols and architectures for distributed systems, including layered, object-based, data-centered, and event-based styles. It also discusses topics like reliability, communication in groups, and order of communication. The conclusion restates that the best architecture depends on application requirements and environment.
Architectural design is concerned with:
understanding how a software system should be organized and,
designing the overall structure of that system.
Architectural design is the critical link between design and requirements engineering, as it identifies the main structural components in a system and the relationships between them.
The output of the architectural design process is an architectural model that describes how the system is organized as a set of communicating components
Architectural design is concerned with:
understanding how a software system should be organized and,
designing the overall structure of that system.
Architectural design is the critical link between design and requirements engineering, as it identifies the main structural components in a system and the relationships between them.
The output of the architectural design process is an architectural model that describes how the system is organized as a set of communicating components
Evasion Streamline Intruders Using Graph Based Attacker model Analysis and Co...Editor IJCATR
Network Intrusion detection and Countermeasure Election in virtual network systems (NICE) are used to establish a
defense-in-depth intrusion detection framework. For better attack detection, NICE incorporates attack graph analytical procedures into
the intrusion detection processes. We must note that the design of NICE does not intend to improve any of the existing intrusion
detection algorithms; indeed, NICE employs a reconfigurable virtual networking approach to detect and counter the attempts to
compromise VMs, thus preventing zombie VMs. NICE includes two main phases: deploy a lightweight mirroring-based network
intrusion detection agent (NICE-A) on each cloud server to capture and analyze cloud traffic. A NICE-A periodically scans the virtual
system vulnerabilities within a cloud server to establish Scenario Attack Graph (SAGs), and then based on the severity of identified
vulnerability toward the collaborative attack goals, NICE will decide whether or not to put a VM in network inspection state. Once a
VM enters inspection state, Deep Packet Inspection (DPI) is applied, and/or virtual network reconfigurations can be deployed to the
inspecting VM to make the potential attack behaviors prominent.
Network Monitoring and Traffic Reduction using Multi-Agent TechnologyEswar Publications
In this paper the algorithms which could improve Transmission band and Network Traffic reduction for computer network has been shown. Problem solving is an area with which many Multiagent-based applications are concerned. Multiagent systems are computational systems in which several agents interact or work together to achieve some purposes. It includes distributed solutions to problems, solving distributed problems and distributed techniques for problem solving. Multiagent using for maximizing group performance with planning, execution, monitoring, communication and coordination. This paper also addresses some critical issues in developing
Multi agent-based traffic control and monitoring systems, such as interoperability, flexibility, and extendibility. Finally, several future research directions toward the successful deployment of Multiagent technology in traffic control and monitoring systems are discussed.
The IT-GRC platform is a solution that is based on
the paradigm of distributed systems, based on multi-agent systems
(MAS) in its different parts namely the user interface, the static
and dynamic configuration of the organization management
profiles, the choice of the best repository and the processing of
processes, it takes advantage of the autonomy and learning aspect
of ADMs as well as their high-level communication and
coordination. However, these technological components are
difficult to manipulate, or users lack the necessary skills to use
them correctly. In this situation, the modeling of a communication
architecture is necessary, in order to adapt the functionalities of
the platform to the needs of the users. To help achieve these goals,
it is necessary to develop a functional and intelligent
communication architecture, adaptable and able to provide a
support framework, allowing access to system functionalities
regardless of physical and time constraints.
Architectural Styles and Case Studies, Software architecture ,unit–2Sudarshan Dhondaley
Architectural styles; Pipes and filters; Data abstraction and object-oriented organization; Event-based, implicit invocation; Layered systems; Repositories; Interpreters; Process control; Other familiar architectures; Heterogeneous architectures. Case Studies: Keyword in Context; Instrumentation software; Mobile robotics; Cruise control; three vignettes in mixed style.
Host-based Security, by Dmitry Khlebnikov @ Secure Development MelbourneAlec Sloman
In this presentation, Dmitry Khlebnikov sets forward 6 broad principles for designing secure IT infrastructure, and provides a comprehensive overview of "Host-based Security".
HOST AND NETWORK SECURITY by ThesisScientist.comProf Ansari
Network management means different things to different people. In some cases, it involves a solitary network consultant monitoring network activity with an outdated protocol analyzer. In other cases, network management involves a distributed database, auto polling of network devices, and high-end workstations generating real-time graphical views of network topology changes and traffic. In general, network management is a service that employs a variety of tools, applications, and devices to assist human network managers in monitoring and maintaining networks.
A MALICIOUS USERS DETECTING MODEL BASED ON FEEDBACK CORRELATIONSIJCNC
The trust and reputation models were introduced to restrain the impacts caused by rational but selfish
peers in P2P streaming systems. However, these models face with two major challenges from dishonest
feedback and strategic altering behaviors. To answer these challenges, we present a global trust model
based on network community, evaluation correlations, and punishment mechanism. We also propose a
two-layered overlay to provide the function of peers’ behaviors collection and malicious detection.
Furthermore, we analysis several security threats in P2P streaming systems, and discuss how to defend
with them by our trust mechanism. The simulation results show that our trust framework can successfully
filter out dishonest feedbacks by using correlation coefficients. It can effectively defend against the
security threats with good load balance as well.
Evasion Streamline Intruders Using Graph Based Attacker model Analysis and Co...Editor IJCATR
Network Intrusion detection and Countermeasure Election in virtual network systems (NICE) are used to establish a
defense-in-depth intrusion detection framework. For better attack detection, NICE incorporates attack graph analytical procedures into
the intrusion detection processes. We must note that the design of NICE does not intend to improve any of the existing intrusion
detection algorithms; indeed, NICE employs a reconfigurable virtual networking approach to detect and counter the attempts to
compromise VMs, thus preventing zombie VMs. NICE includes two main phases: deploy a lightweight mirroring-based network
intrusion detection agent (NICE-A) on each cloud server to capture and analyze cloud traffic. A NICE-A periodically scans the virtual
system vulnerabilities within a cloud server to establish Scenario Attack Graph (SAGs), and then based on the severity of identified
vulnerability toward the collaborative attack goals, NICE will decide whether or not to put a VM in network inspection state. Once a
VM enters inspection state, Deep Packet Inspection (DPI) is applied, and/or virtual network reconfigurations can be deployed to the
inspecting VM to make the potential attack behaviors prominent.
Network Monitoring and Traffic Reduction using Multi-Agent TechnologyEswar Publications
In this paper the algorithms which could improve Transmission band and Network Traffic reduction for computer network has been shown. Problem solving is an area with which many Multiagent-based applications are concerned. Multiagent systems are computational systems in which several agents interact or work together to achieve some purposes. It includes distributed solutions to problems, solving distributed problems and distributed techniques for problem solving. Multiagent using for maximizing group performance with planning, execution, monitoring, communication and coordination. This paper also addresses some critical issues in developing
Multi agent-based traffic control and monitoring systems, such as interoperability, flexibility, and extendibility. Finally, several future research directions toward the successful deployment of Multiagent technology in traffic control and monitoring systems are discussed.
The IT-GRC platform is a solution that is based on
the paradigm of distributed systems, based on multi-agent systems
(MAS) in its different parts namely the user interface, the static
and dynamic configuration of the organization management
profiles, the choice of the best repository and the processing of
processes, it takes advantage of the autonomy and learning aspect
of ADMs as well as their high-level communication and
coordination. However, these technological components are
difficult to manipulate, or users lack the necessary skills to use
them correctly. In this situation, the modeling of a communication
architecture is necessary, in order to adapt the functionalities of
the platform to the needs of the users. To help achieve these goals,
it is necessary to develop a functional and intelligent
communication architecture, adaptable and able to provide a
support framework, allowing access to system functionalities
regardless of physical and time constraints.
Architectural Styles and Case Studies, Software architecture ,unit–2Sudarshan Dhondaley
Architectural styles; Pipes and filters; Data abstraction and object-oriented organization; Event-based, implicit invocation; Layered systems; Repositories; Interpreters; Process control; Other familiar architectures; Heterogeneous architectures. Case Studies: Keyword in Context; Instrumentation software; Mobile robotics; Cruise control; three vignettes in mixed style.
Host-based Security, by Dmitry Khlebnikov @ Secure Development MelbourneAlec Sloman
In this presentation, Dmitry Khlebnikov sets forward 6 broad principles for designing secure IT infrastructure, and provides a comprehensive overview of "Host-based Security".
HOST AND NETWORK SECURITY by ThesisScientist.comProf Ansari
Network management means different things to different people. In some cases, it involves a solitary network consultant monitoring network activity with an outdated protocol analyzer. In other cases, network management involves a distributed database, auto polling of network devices, and high-end workstations generating real-time graphical views of network topology changes and traffic. In general, network management is a service that employs a variety of tools, applications, and devices to assist human network managers in monitoring and maintaining networks.
A MALICIOUS USERS DETECTING MODEL BASED ON FEEDBACK CORRELATIONSIJCNC
The trust and reputation models were introduced to restrain the impacts caused by rational but selfish
peers in P2P streaming systems. However, these models face with two major challenges from dishonest
feedback and strategic altering behaviors. To answer these challenges, we present a global trust model
based on network community, evaluation correlations, and punishment mechanism. We also propose a
two-layered overlay to provide the function of peers’ behaviors collection and malicious detection.
Furthermore, we analysis several security threats in P2P streaming systems, and discuss how to defend
with them by our trust mechanism. The simulation results show that our trust framework can successfully
filter out dishonest feedbacks by using correlation coefficients. It can effectively defend against the
security threats with good load balance as well.
Metric for Evaluating Availability of an Information System : A Quantitative ...IJNSA Journal
The purpose of the paper is to present a metric for availability based on the design of the information
system. The availability metric proposed in this paper is twofold, based on the operating program and
network delay metric of the information system (For the local bound component composition the
availability metric is purely based on the software/operating program, for the remote bound component
composition the metric incorporates the delay metric of the network). The aim of the paper is to present a
quantitative availability metric derived from the component composition of an Information System, based
on the dependencies among the individual measurable components of the system. The metric is used for
measuring and evaluating availability of an information system from the security perspective, the
measurements may be done during the design phase or may also be done after the system is fully
functional. The work in the paper provides a platform for further research regarding the quantitative
security metric (based on the components of an information system i.e. user, hardware, operating
program and the network.) for an information system that addresses all the attributes of information and
network security.
Distributed System Unit 1 Notes by Dr. Nilam Choudhary, SKIT JaipurDrNilam Choudhary
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2. Content ….
Introduction
Communication in Distributed Systems
Architecture of Distributed System
Layered style
object based
data-centered
event-based
Reliability
Communication in groups
Order Communication
Conclusion
References
3. Introduction
Distributed computing will be central to advances in a broad range of critical applications, including
intelligence information systems, military command and control, air traffic control, electric power grid
management, telecommunications, and a vast array of web-based commercial and government
applications. Indeed, a massive rollout of such systems is already underway. Yet while impressive
capabilities have been easy to develop and demonstrate in small-scale settings, once deployed these
systems often stumble badly.
Software that runs securely and reliably in small-scale mockups may lose those properties as numbers of
users, the size of the network and transaction processing rates all increase. Whereas small networks are
well behaved, any sufficiently large network behaves like the public Internet, exhibiting disruptive
overloads and routing changes, periods of poor connectivity and throughput instability. Failures rise in
frequency simply because the numbers of participating components are larger. A scalable technology
must ride out such forms of infrastructure instability
4. In a distributed system there is no shared memory and thus the
whole nature of the communication between processes should be
reconsidered.
The processes, to communicate, must adhere to rules known as
protocols.
For distributed systems in a wide area, these protocols often take
the form of several layers and each layer has its own goals and
rules.
Messages are exchanged in various ways, and there are many
design options in this regard, an important option is the "remote
procedure call.
It is also important to consider the possibilities of communication
between groups of processes, not only between two processes.
5. ARCHITECTURE of Distributed System
Software Architecture of Distributed System:
It deals with how software components are
organised and,
how they work together, i.e., communicate with each
other.
Typical software architectures include:
• Layered,
• object-oriented,
• data-centred,
• and event-based
Software architectures
6. Contd…
System Architecture:
placement of machines
placement of software on machines
There is no single best architecture:
The best architecture for a particular system depends on the
application requirements and the environment.
8. Contd…
Components at layer LNare allowed to call
components at underlying layers LN-1,but not
the other way around.
Database Layer
Data Management Layer
Applications Layer
User Interface Layer
Requests Results
9. Architectural styles (2/4): object based
Object
Object
Object
Object
Object
Method Calls
Basic idea: Organize into logically different components, and subsequently distribute
those components over the various machines.
Observation: object-based style for distributed object systems.
In essence, each object corresponds to what we have defined as a component and
these components are connected through a (remote) procedure call mechanism.
component = object
connector = RPC or RMI
10. Architectural styles (3/4): data-centered
Main purpose: data access and update
Processes interact by reading and modifying data in
some shared repository (active or passive)
Traditional database (passive): responds to requests
Blackboard system (active): system updates clients when
information changes.
11. Architectural Styles (4/4): event-based
Processes communicate through event
propagation
‘Publish/Subscribe’ systems
• Processes subscribed to events will receive them.
Benefit is, components are loosely coupled;
i.e. they don’t need to explicitly refer to each
other.
12. Contd…
Figure (a) The event-based architectural style
• Communication via event
propagation, in dist. Systems
communication often in
Publish/ Subscribe; e.g.,
register interest in market
info; get email updates
•Decouples sender &
receiver; asynchronous
communication
Event-based arch.
supports several
communication styles:
• Publish-subscribe
• Broadcast
• Point-to-point
13. Contd…
Data Centric Architecture; e.g., shared distributed file systems
or Web-based distributed systems
Combination of data-centered and event based architectures
Processes communicate asynchronously
Figure (b) The shared data-space architectural style.
15. Client-Server from another perspective
A typical client-server application can be decomposed into three logical parts:
the interface part, the application logic part, and the data part.
Implementations of the client-server architecture vary with regards to how the
parts are separated over the client and server roles.
16. VERTICAL DISTRIBUTION (MULTI-TIER)
splitting up a server’s functionality over multiple computers
Three layers’ of functionality:
User interface
Processing/Application logic
Data
Splitting up the server functionality in this way is beneficial to a system’s scalability as well
as its flexibility.
Scalability is improved because the processing load on each individual server is reduced,
and the whole system can therefore accommodate more users.
Logically different components on different machines
The vertical distribution, or multi-tier, architecture distributes the traditional server functionality
over multiple servers. A client request is sent to the first server.
1
6
18. HORIZONTAL DISTRIBUTION
replicating a server’s functionality over multiple computers
In this case, each server machine contains a complete copy of all hosted
Web pages and client requests are passed on to the servers in a round
robin fashion.
The horizontal distribution architecture is generally used to improve
scalability (by reducing the load on individual servers) and reliability (by
providing redundancy).
Logically equivalent components replicated on different machines
19. PEER TO PEER COMMUNICATION ARCHITECTURE
All processes have client and server roles.
With the potentially huge number of participating nodes in a peer to
peer network, it becomes practically impossible for a node to keep
track of all other nodes in the system and the information they offer.
20. Issues related to reliability of communication;
-Ensuring that the message was received on node (s)
target (s)
-Maintenance of order in the delivery of messages
-Flow control to avoid "flooding" the receiving node
-Fragmentation of the messages to eliminate
limitations on size
Maximum messages
If the communication system does not guarantee
some of these
aspects, it must send the application
21.
three choices:
- Order FIFO: Messages from one source reach each
receiver in the order they are sent.
·There are no guarantees on messages from different
issuers
-Causal ordering: If the messages sent between two
emitting a possible relationship "cause and effect, all
group process first receive the message "cause" and then
message "effect."
- If no connection, no guarantee any delivery order
- Definition of "causality" is discussed in "Synchronization"
-Total Management:All messages (various sources) sent
a group are received in the same order for all items.
22. References
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