Essential Properties of Operating Systems

Asymmetric clustering: one host runs the database application while the other host simply monitors it. If the server fails, the monitoring host becomes the active server. This is appropriate for providing redundancy. However, it does not utilize the potential processing power of both hosts.

can usefuly be shared. Give examples of their sharing as it ocurs in practice in distributed

Files are stored at server disk. Clients do read and write operations on the network.

I have learned many things in this class, things I never thought I were important. For example, the types of networks, I had never heard of MANs before. I knew what a LANs and WANs were but not the MANs. I now know MANs (Metropolitan Area Networks are large scale LANs. Another, thing gleaned from this class is Peer-to-Peer and Client/Server Networks. I found out that Peer to Peer networks are decentralized communication models where each station has the same ability to perform and any station can start a communication session. In the P2P network model each node functions as both a client and server. Whereas, a Client/Server Network is a program relationship where one program is the client and requests a service or resource from another program

1.17)Ans.Asymmetric clustering: In this the node will be performing the database operations and the other node monitoring the first node and

In a client and server caches, an each server cache is managed in one distributed system tier by a number of server members, usually cache server processes. In a separate tier, clients maintain their own caches that automatically call upon the server side to set off cache to update the server with client updates. In addition, the clients can member to server events using both data key specifications and queries. The client/server topology can be extended to any number of tiers.

1.17 Consider a computing clusters consisting of two nodes running a database. Describe two ways in which the cluster software can manage access to the data on the disk. Discuss the benefits and disadvantages of each.

When it comes to planning an entire system network is not a easy task. We need to explore the options and I plan on covering this in the essay and will go into brief details about several key concepts and explain key points in Peer to Peer (P2P) client / server architecture, web based computing and how network and their protocols are required for successful network implementation.

As basic users, security is one feature that most of us overlook when it comes to operating systems until it is too late. In this paper we will discuss the security flaws within the Windows Operating system, and then discuss countermeasures to fix the system flaw.

1. The relative advantages and disadvantages of at least three different measures used to protect operating systems.

Cyber Security is the protection applied to information, computers, computer networks, information stored therein from unauthorized access, disruption, disclosure, use, modification or destruction. It is the security provided in terms of three elements called confidentiality, availability and

We have discussed some common features, operations and performances of the applications including CAN, Chord, Pastry, Napster and Gnutella. It can be seen that while some schemes (Napster) are less complex to implement the bottleneck scalability proves a strong drawback. On the other hand, the other P2P networks applications even though being highly scalable may become very complex to implement. With respect to the selection of which network is suitable for a particular implementation of a peer to peer network, a careful consideration of factors such as security, scalability, routing performance would need to be considered to strike a balance between any

P2p networking is a distributed application design that divides tasks or work between peers (students). Peers all have the same rights, equally participants in the application. They are said to form a peer to peer network of connection. P2p systems can be used to provide anonymized routing of network traffic, massive parallel computing environments, distributed storage and other functions. P2p applications allow users to control many parameters of operation how many member connections to seek or allow at one time whose systems to connect to or avoid what services to offer and how many system resources to give time to the network. Some connect to some of the connections in the network with little control for the user.

Linux is a trademark owned by Linus Torvalds [1]. It is an operating system which is powerful, free and inexpensive to own based on UNIX [1]. It is a POSIX-compliant with versions available to install in cell phones, supercomputers and most computing systems [1]. Linux is an open source program as its source code is available to the general public for use and the right to modify from its original design without any charges [1]. New code will be added to the next version made available with Linux if it is accepted as a universal improvement [1]. The code will continue to exist and developed by the user even if the company fails [1]. Moreover, updates for Linux are available every six months [1]. Nowadays, Linux is in constant development by

What is Operating System Security, Operating system security is the process of ensuring OS integrity, confidentiality and availability also OS security refers to specified steps used to protect the OS from threats, viruses, worms, malware or remote hacker. OS security include all avoiding-control techniques, which safeguard any computer information from being stolen, edited or deleted if OS security is included. OS security allows different applications and programs to perform required tasks and stop unauthorized interference. OS security may be applied in many ways. We 're going to discuss following topics in this article. A brief description about security and what are the types of encryption and what is Authentication, One Time passwords, Program Threats, System Threats and Computer Security Classifications.