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Remote access should be used with the utmost caution if security is a priority Even if SSH is being used to log into a machine remotely, security can be compromised One of the biggest caveats to remote access is the integrity of the host machine In general, remote access it requested from a machine that may be compromised Even if encryption guarantees the transmission is secure, a keystroke logger on the host machine may be monitoring your username and password
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Accessing Information: Peer-to-Peer Networking
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Peer-to-peer (P2P) computing is the sharing of computer resources and services by direct exchange between systems These resources and services include the exchange of information, processing cycles, cache storage, and disk storage for files Peer-to-peer computing takes advantage of existing desktop computing power and networking connectivity, allowing economical clients to leverage their collective power to benefit the entire enterprise The peer-to-peer method of computing has been around for decades In recent years however, a certain aspect of P2P computing has reached the mainstream The reason that P2P has come on so strong recently is simple Currently a bevy of inexpensive computing power, storage, and bandwidth is available All this cheap technology is also in the hands of the masses One company in particular deserves credit for popularizing P2P: Napster However, modern P2P is a very recent implementation of a very old concept As many as 30 years ago, companies were working on architectures that would now be labeled P2P
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346 Network Security Illustrated In a peer-to-peer architecture, computers that have traditionally been used solely as clients communicate directly among themselves and can act as both clients and servers P2P nodes, as they can be called, will assume whatever role is most efficient for the network at any given time This is possible because the P2P architecture allows its nodes to make role change decisions on the fly One result of this mechanized computing efficiency is that the load on traditional servers can be relieved Now, instead of doing it all, traditional servers can perform more specialized functions such as email, Web, and domain name services, and do so with more efficiency At the same time, peer-to-peer computing can reduce the need for IT organizations to grow parts of its infrastructure in order to support certain services, such as backup storage Backup is seldom needed in a peer-to-peer environment Multiple versions of all files can be stored on multiple P2P nodes If any given node breaks down, there will always be copies of the files located elsewhere Another name for this polled resource environment is distributed computing Many people feel that P2P and distributed computing will eventually replace all standard client/server environments Some even think it s the next step in computing evolution A closer look reveals that in real working environments it has tremendous benefits, and huge drawbacks
What people think: I want my MP3 s What we think: P2P networking has a potentially bright future, but the days of the great mp3-free-for-all are coming to an end Security and legal risks will eventually outweigh the benefits of illegal filesharing
P2P In Practice
In the business world, peer-to-peer computing can be integrated in many ways across many types of systems Business applications for P2P computing come in several different flavors In general, P2P offers a new and powerful method for businesses to use their combined hardware and software to its fullest potential Collaboration is one area that peer-to-peer computing can greatly enhance A collaboration environment that is properly implemented with P2P will allow users an unprecedented level of real-time shared resources Specifically, P2P collaboration tools give teams of users access to the latest data available This can be a real advantage in organizations that have multiple office locations Collaboration increases productivity by decreasing the time for multiple reviews by project participants and allows teams in different geographic areas to work together As with file sharing, it can decrease network traffic by eliminating email and decreases server storage needs by storing the project locally Peer-to-peer computing can help businesses deliver services and capabilities more efficiently across diverse geographic boundaries In essence, edge services, acting as a network caching mechanism, move data closer to the point at which it is actually consumed For example, a company with sites in multiple continents needs to provide the same standard training across multiple continents using the Web
Part X Accessing Information 347 Instead of streaming the database for the training session on one central server located at the main site, the company can store the video on local clients, which act essentially as local database servers This speeds up the session because the streaming happens over the local area network (LAN) instead of the Wide Area Network (WAN) It also utilizes existing storage space, thereby saving money by eliminating the need for local storage on servers Peer-to-peer computing can help businesses with large-scale computer processing needs Using a network of computers, P2P technology can use idle processor power and disk space, allowing businesses to distribute large computational jobs across multiple computers In addition, results can be shared directly between participating peers The combined power of previously untapped computational resources can easily surpass the normal available power of an enterprise system without distributed computing The results are faster completion times and lower costs because the technology takes advantage of power available on client systems Peer-to-peer computing also allows computing networks to dynamically work together using intelligent agents Agents reside on peer computers and communicate various kinds of information back and forth Agents may also initiate tasks on behalf of other peer systems For instance, intelligent agents can be used to prioritize tasks on a network, change traffic flow, search for files locally, or determine anomalous behavior, such as a virus, and stop it before it effects the network
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