Exam 2: Application Layer

Describe and sketch a two tier,three tier and n-tier architecture.What is a network architecture? Compare and contrast two-tiered,three-tiered,and n-tiered client server architectures.What are the technical differences and what advantages and disadvantages do each offer? How does a 2-tier client server network differ from an n-tier client server network.Describe one advantage and one disadvantage that a 3-tier architecture has compared to a 2-tier architecture.

______________,or the algorithms or business logic programmed into the application,can be simple or complex depending on the application.

The software that runs on the mail server is referred to as the____________

A(n)_________-tiered architecture uses only two sets of computers:one set of clients and one set of servers.

Describe how a Web browser and Web server work together to send a web page to a user.Draw a diagram and label the parts to assist you in your description.

All three parts (request line,request header,request body)of an HTTP request from a web browser to a web server are required when a request is made.

Each server on a network that needs to act as a web server needs an application layer software package called a (n)______________.

The two functions of middleware are to: 1)provide a standard way of communicating that can translate between software from different vendors,and 2)manage the message transfer between clients and servers so that clients do not need to 'know' which server contains the application's data.

The standard protocol for communication between a Web browser and a Web server is the web protocol.

In a ___________ architecture,computers are both client and server,thus sharing the work.

Middleware is the software that sits between the application software on the client and the application software on the server.

One disadvantage of the ____________ architecture is that places a greater load on the network.

Describe the difference between a two tier and three tier email message transfer,using diagrams and discussing how this approach differs from the two layer email transfer.Do users always require the same architecture for email?Why or why not?Discuss.

With respect to costs for a client-server network,which of the following is true?

What is Telnet and why is it useful?

A "thick client" architecture approach:

Scalability refers to the ability to increase or decrease the capacity of the computing infrastructure in response to changing capacity needs.

What do a user agent and message transfer agent do in an SMTP/IMAP email system? What are some examples of user agent packages?

Describe the history of the Internet and the Web (part of this is in Chapter 1,part in Chapter 2).Where do you forsee the future evolution of the Internet heading,and why?

Which of the following is not an advantage of instant messaging?