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There are two dominant forms of building distributed systems: client-server systems, i.e. systems in which one machine acts as a server and act as clients; and peer-to-peer systems, where each host is both a server and a client. Standard web access follows the client-server model, and services such as BitTorrent follow the peer-to-peer model. However, in real life these are not completely distinct; for instance, internally Google applies some of each of these methodologies. Actually, client-server system are sometimes implemented as a chain of clients and servers, even though from the point of view of the client there's only one server.
Another possible building pattern is that in which the client communicates directly with only a server, but in the background its requests are actually processed by a cloud of machines, which actually resembles the way Google works internally. In this case, the cloud of machines implements a system with lots of redundancy (e.g. via a big distributed ?le system). Some of the machines in the cloud hold data, and other machines hold meta-data. When some client requests, for instance, a ?le, the meta-data servers ?rst identify which other machines hold each piece of that ?le. This type of architecture represents the current trend being followed when creating large scale systems. So, in practice, we see that current successful large scale systems are a mix between client-server architectures and peer-to-peer systems, implemented with lots of storage and computational redundancy.
Document the Switch Configuration When you have done your troubleshooting, capture the output of the show run command and save it to a text document for each switch.
Hold-Down Timers - Routers ignore network update information for a number of periods.
Explain the physical and logical paths in a computer communication network also
What's the difference among distance vector and link-state protocol?
Define the term - Hot swapping The reliability of the machine can be dramatically improved by installing the best components. Hot swapping is a concept through which component
Ping and Traceroute are used by ICMP for Testing. Destination Unreachable messages are obtained by a router when it does not have a route to the network.
List some most useful advantages of Token Ring. Here are Token ring's most useful advantages: a. It depends excellent throughput under high-load conditions. b. Token Ring
Selection of computing infrastructure The computing equipment on an Intranet must be selected in such a manner that they do not get obsolete very quickly or become too costly f
Illustrate the Bellman-Ford algorithm The Bellman-Ford algorithm uses only on information from its neighbours and knowledge of its link costs, to update it costs and paths. Dij
In point-to-point message passing, single process sends/receives message to/from another process. There are four communication modes for sending a message: i) Buffered mode
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