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In incremental integration, you write and test a program in small pieces and then combine the pieces one at a time. In this one-piece-at-a-time approach to integration, you follow these steps: 1. Develop a small, functional part of the system. It can be the smallest functional part, the hardest part, a key part, or some combination. Thoroughly test and debug it. It will serve as a skeleton on which to hang the muscles, nerves, and skin that make up the remaining parts of the system. 2. Design, code, test, and debug a class. 3. Integrate the new class with the skeleton. Test and debug the combination of skeleton and new class. Make sure the combination works before you add any new classes. If work remains to be done, repeat the process starting at step 2. Occasionally, you might want to integrate units larger than a single class. If a component has been thoroughly tested, for example, and each of its classes put through a mini-integration, you can integrate the whole component and still be doing incremental integration. The system grows and gains momentum as you add pieces to it in the same way that a snowball grows and gains momentum when it rolls down a hill.

1. Using Routing And Remote Access, you have configured demand-dial routing to join a branch office to your corporate LAN. However, even though you are using the RIP protocol, routes are not being updated across the WAN link. Why is this happening, and how can you allow the routes to be updated

of IP traffic that are allowed for remote access VPN connections. With profile packet filters, you can configure the IP traffic that is allowed to be received

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Figure 29-3 Incremental integration helps a project build momentum, like a snowball going down a hill.

RIP has been configured for autostatic updates over demand-dial connections. In the General node within IP Routing in Routing And Remote Access, right-click the demand-dial interface and select Update Routes.

2. You are connected to a branch office over a demand-dial connection. How can you best prevent your users from connecting to the branch office during lunch hours

The incremental approach offers many advantages over the traditional phased approach regardless of which incremental strategy you use.

from remote access clients (Input Filters) or sent to remote access clients (Output Filters) on an exception basis: either all traffic except traffic speci fied by filters, or no traffic except traffic specified by filters. Remote access policy profile filtering applies to all remote access connections that match the remote access policy.

3. You have a branch office connected to your main office through a dial-on-demand Integrated Services Digital Network (ISDN) connection. You want to stop Hypertext Transfer Protocol (HTTP) requests from initiating the connection. How can you achieve this goal

Configure an IP demand-dial filter at both routers to initiate connections for all traffic except that destined for TCP port 80.

Errors are easy to locate When new problems surface during incremental integration, the new class is obviously at fault. Either its interface to the rest of the program contains an error or its interaction with a previously integrated class produces an error. Either way, you know exactly where to look. Moreover, simply because you have fewer problems at once, you reduce the risk that multiple problems will interact or that one problem will mask another. The more interface errors you tend to have, the more this benefit of incremental integration will help your projects. An accounting of errors for one project revealed that 39 percent were intermodule interface errors (Basili and Perricone 1984). Since developers on many projects spend up to 50 percent of their time debugging, maximizing debugging effectiveness by making errors easy to locate provides benefits in quality and productivity.

4. Your main office is connected to a branch office through demand-dial routing. Each router is configured to call or answer the call of the other router as needed. However, the Finance Department has asked you to ensure that telephone con nection charges between demand-dial routers be predominantly incurred by the main office. How can you achieve this goal