1. Pertemuan 04 Proxy/Cache
Matakuliah : H0451/Praktikum Jaringan Komputer
Tahun : 2006
Versi : 1/0
Pertemuan 04 Proxy/Cache

2. Learning Outcomes Pada akhir pertemuan ini, diharapkan mahasiswa
akan mampu :
Menghubungkan LAN dengan INTERNET menggunkan Proxy

3. Proxy Servers
Proxy services sit between user on the inside and server on the outside. Instead of talking directly, user and server talk through proxy.

4. Proxy Servers Advantages Can be good at logging Can provide caching
Can do intelligent filtering based on “content”
Can perform user level authentication
Disadvantages
Not all services have proxied versions
May need different proxy server for each service
Require modification of client

5. Topology of proxies How many proxies we should use
Where we should place them
Define the relationships between proxies

6. Web Cache
Placed between Data Server and Web Clients
Saves copies of objects requested from a client
Use the copies when a cached object is requested again

7. Type of Web Caches
Browser Caches
Proxy Caches
Web Server Caches
Application Server Caches
DBMS Caches

8. Web Cache Use
Reduce Latency
Reduce Traffic

9. Updates
Push Function
Update to the database ->Immediately triggers the deletion and recalculation of the materialized data invalidated by the update
Pull function
Materialized data periodically checked for freshness

10. Current search topics Internet protocol and connection
General Architectures used from Data intensive Web-Sites
Cache Protocols
Can we make true the communication between caches and materialized data with the existing protocols?
Where, what and when is cached.
Create a case tool.