tailieunhanh - WINDOWS 2000 TROUBLE SHOOTING TCP/I P phần 7

và nhận được địa chỉ IP của Internet đặt máy chủ tin tức. Không có thời gian làm nguồn tài nguyên nội bộ của bạn trở nên bị đe dọa hoặc xúc động của người sử dụng Internet. Hình 7,10 hiển thị bố trí mạng lưới đơn giản của cấu hình này. Lưu ý hai máy chủ DNS, một trong nội bộ và một bên ngoài. | 418 Chapter 8 Troubleshooting Windows 2000 IP Addressing Problems whose IP does match the one in the ARP message first puts the sending computer s IP MAC address information in its own ARP cache then sends a response to the sending computer with the information about its MAC address. When the sending computer gets the response it adds the destination computer s IP MAC address information to its cache and can now send data to the destination computer. IP Communications on a Routed Network to a Remote Subnet If the destination computer is not on the same local subnet it works slightly differently. In this case ARP will resolve the remote IP address to the physical address of the router that can forward the message on to the subnet on which the destination computer resides. The IP protocol again checks the IP addresses and subnet mask and this time determines that the destination computer is not on the local subnet. IP determines the IP address of the default gateway router and the sending computer checks the ARP cache for a physical address that matches the router s IP address. For IT Professionals __ IP Addresses and the Internet As we all know by now TCP IP is the protocol suite used for communications over the vast global network of networks that we call the Internet. We also know that in order for communications to take place on a TCP IP network every network ID on the internetwork must be unique and every Host ID must be unique to that network. In theory this means that of the millions of computers connected to the Internet there should be no two with the same IP address. In practice however this is not strictly true. Due to the shortage of available IP addresses and also because registering multiple addresses adds to the cost of running a network many companies and home networks use some method of connecting many computers to the Internet through a single IP address. There are two popular types of software designed to .