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Programming-language structures are the language s primitive data types, control structures, and so on. Most common languages also provide additional libraries, access to operating system calls, and so on. Using these structures and tools comes naturally since you can t program without them. Many programmers never work above this level of abstraction, which makes their lives much harder than they need to be.

Your organization has a number of locations spread throughout the United States. You are the New York administrator. All client machines on your network obtain their configurations through DHCP and are operating correctly. An employee from Seattle visits your New York office and brings his laptop computer running Microsoft Windows XP Professional. He connects his internal NIC to a hub on the New York network. You have set up a user account for the visitor and he logs on successfully. He can ping all the other computers on the network by IP address but not by host name, and he cannot access resources on your servers by specifying the server name. How should you reconfigure his computer A. Install NetBEUI on his PC.

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C. Configure TCP/IP on his LAN interface to obtain the address of a DNS server auto matically. D. Add the host names and IP addresses of the New York servers to the laptop s Hosts file.

Low-level implementation structures are slightly higher-level structures than those provided by the language itself. They tend to be the operations and data types you learn about in college courses in algorithms and data types stacks, queues, linked lists, trees, indexed files, sequential files, sort algorithms, search algorithms, and so on. If your program consists entirely of code written at this level, you ll be awash in too much detail to win the battle against complexity.

You are a network administrator in a large international organization. Your company has a large intranet with many routers and WAN connections. Speed of communication is important in the organization, and the WAN links are over dedicated high-bandwidth lines. The routers are modern high-end devices, and all servers are either Microsoft Windows 2000 Advanced Server or Microsoft Windows Server 2003, Enterprise Edition. TCP/IP is the only protocol stack used in the company network. Employees report unacceptable delays in accessing resources on an internal Web server. The fully quali fied domain name (FQDN) of the Web server is resources.chicago.worldtraders.corp. You are based in Los Angeles. How can you test the connection between Los Angeles and Chicago and determine where the delays are occurring A. Open a command prompt and execute the command PathPing resources.chi cago.worldtraders.corp. B. Open a command prompt and execute the command Ping f resources.chi cago.worldtraders.corp. C. Open a command prompt and execute the command Tracert d resources.chi cago.worldtraders.corp. D. Open a command prompt and execute the command Netstat s p ip.

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At this level, you have the primitives you need in order to work in terms of the problem domain. It s a glue layer between the computer-science structures below and the high-level problem-domain code above. To write code at this level, you need to figure out the vocabulary of the problem area and create building blocks you can use to work with the problem the program solves. In many applications, this will be the business objects layer or a services layer. Classes at this level provide the vocabulary and the building blocks. The classes might be too primitive to be used to solve the problem directly at this level, but they provide an Erector set that higher-level classes can use to build a solution to the problem.

You should use a separate user account for each site that contains a calling router. Each user account should have a name that matches a demand-dial interface configured on the answering router. When you create dial-in accounts with the Demand-Dial Interface Wizard, this one-to-one relationship between user accounts used by calling routers in separate sites and demand-dial interfaces is automatically created. User accounts also contain dial-in settings. The dial-in setting most relevant for VPN connections is the Remote Access Permission setting, which has the following values:

Implementing, Managing, and Maintaining IP Addressing (1.0)