An application server provides business logic for application programs and supports the construction of dynamic web pages. It allows applications to run on multiple parallel servers for improved scalability and performance. Key features include clustering for load distribution, failover for automatic switching to redundant servers, and load balancing to optimize resource utilization. Application servers provide advantages like centralized configuration, data integrity, and security. Common application servers include Java Enterprise Edition servers and the Zend platform for PHP applications.

1. Application server

2. Table of contents Overview Services Clustering Fail-over Load_balancing Java appl server Zend platform Advantages Data and code integrity Centralized configuration Security Apache jserv protocol Application layer protocol

3. Overview An application server is a server program in a computer. Provides the business logic for an application program. The application server is frequently viewed as part of a three-tier application 1.GUI(personal computer,work station...) 2.server 3.database

4. Cont....

6. Efficient execution of procedures

7. programs

8. Routines

9. Scripts

10. Supporting the construction of application

11. main job is to support the construction of dynamic pages.

13. Fail-over

14. Load-balancing

16. The load is distributed across different servers

17. Even if any of the servers fails, the application is still accessible via other cluster nodes.

18. Clustering is crucial for scalable enterprise applications, as you can improve performance by simply adding more nodes to the cluster.

19. Clustering

21. Types of fail-over

22. Automatic

23. manual

25. Failover

26. Load balancing Load balancing allows an server administrator to distribute the client requests across multiple servers to optimize resource utilization. Load balancing improves server fault tolerance and end-user response time by # distributing load across servers # directing traffic away from unavailable servers.

29. handling transparently connections to the database at one side

30. connections to the web client at the other.

32. Glassfish Application Server

33. Caucho Resin Application Server

34. WebSphere Application Server

35. JBoss

36. Jetty

38. U sed for running and managing PHP applications .

40. Centralized configuration

41. Security

42. Performance

44. By centralizing business logic on an individual server or on a small number of server machines, updates and upgrades to the application for all users can be guaranteed

45. Centralized configuration

46. Changes to the application configuration, such as a move of database server, or system settings, can take place centrally

48. Devolving responsibility for authentication away from the potentially insecure client layer without exposing the database layer.

49. Performance

50. By limiting the network traffic the client–server model improves the performance

52. It can conduct inbound requests from a web server through to an application server

53. It also supports some monitoring in that the web server

55. TCP/IP protocol

56. TCP/IP protocol

57. 1.first two networking protocol

58. 2.contains many layers

59. 3.it consists of application,transport,internet and link layer

61. FTP

62. HTTP

63. SMTP

64. SNMP

65. SOAP

66. Telnet

67. XMPP

68. RPC

70. # e-mail transmission across IP networks

71. # send and receive mail

72. FTP-File Transfer Protocol

73. # use to copy a file from one host to another

74. # security

75. # requires password(authentication)