Web Caching
The World Wide Web can be considered as a system with huge distributed information which provides access to shared data objects. In recent past years there have been exponential growth in size of WWW, which causes network congestion. There are discrete natures World Wide Web documents with the help of which everyone can find information according to their liking. But, this huge rate of growth has put a heavy load on the Internet communication channels
As the Internet is growing to grow in vogue and size, so have the scalability demands on its infrastructure. Expanding growth without gullibility solutions will finally result in more network load and unacceptable service response times. These are the reasons for which the web users are suffering from the network congestion and server overloading. Web user's bad experience on the performance in World Wide Web increase the gullibility demands on Web’s infrastructure.
It is well-known or all of us that the main reason for the increase in web traffic is due to the rise in popularity of the
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The effects of Web caching are two-fold. We can improve the performance of Web with the help of caching pages. There are various advantages of using Web caching.
1. Caching reduces bandwidth consumption, hence it decreases network traffic and diminish network congestion.
2. The caching reduces access latency due to two reasons:
I. Frequently accessed documents are fetched from nearby proxy cache instead of remote data servers, hence the transmission delay is minimized.
II. As Caching can reduce the network traffic, so those documents which are not cached can also be retrieved comparatively faster than without caching, due to less congestion along the path and with less work load on the server.
3. Caching reduces the workload of the remote Web server by spread the data widely among the proxy caches over the
The internet works on the basis that some computers act as ‘servers’. These computers offer services for other computers that are accessing or requesting information, these are known as ‘clients’. The term “server” may refer to both the hardware and software (the entire computer system) or just the software that performs the service. For example, Web server may refer to the Web server software in a computer that also runs other applications or it may refer to the computer system dedicated only to the Web server applicant. For example, a large Web site could have several dedicated Web servers or one very large Web server.
Files location and operation are hidden to clients. Clients don’t need to know how the system is designed, how data is located and accessed, and how faults are detected. The logic name of the file should not be changed even when relocate the file. Client sends requests to handle files without thinking about the complex mechanisms of the underlying system which performs operations. The DFS server just provide an access to the system with some simple tools. DFSs also use local caching for frequently used files to eliminate network traffic and CPU consumption caused by repeated queries on the same file and represent a better performance. And the local caching also give a fast access to those frequently used files. So caching has a performance transparency by hiding data distribution to users. DFSs have their own mechanisms to detect and correct the faults, so that users do not be aware that such fault
a.k.a. a.k Web. The Web. The Web. 16 Apr. Foner, Eric, and John A. Garraty.
DNS is used to provide a mapping between the websites name and their respective IP addresses. DNS caching is a mechanism to cache this Website name–IP address mapping on the DNS server for some amount of time. When number of users in the office or universities access same websites again and again then DNS caching is used to improve the performance of the system as DNS server doesn’t need to do all hierarchical searching using root name servers and TLD name servers for each and every user request. Network will be too overloaded if we don’t use DNS caching as DNS server needs to do number of DNS queries in order to find one IP address. DNS caching stores the IP addresses of frequently used websites in the organization.
Blumenthal, Marjory S., and David D. Clark. "Rethinking the design of the Internet: the end-to-end arguments vs. the brave new world." ACM Transactions on Internet Technology (TOIT)1.1 (2001): 70-109.
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