TAILIEUCHUNG - Internetworking with TCP/IP- P50

Internetworking with TCP/IP- P50: TCP/IP has accommodated change well. The basic technology has survived nearly two decades of exponential growth and the associated increases in traffic. The protocols have worked over new high-speed network technologies, and the design has handled applications that could not be imagined in the original design. Of course, the entire protocol suite has not remained static. New protocols have been deployed, and new techniques have been developed to adapt existing protocols to new network technologies | Sec. The Need For Dynamic Configuration 449 Item Type Item Code Length Octet Contents of Value Routers 3 N IP addresses of N 4 routers Time Server 4 N IP addresses of N 4 time servers IEN116 Server 5 N IP addresses of N 4 IEN116 servers Domain Server 6 N IP addresses of N 4 DNS servers Log Server 7 N IP addresses of N 4 log servers Quote Server 8 N IP addresses of N 4 quote servers Lpr Servers 9 N IP addresses of N 4 lpr servers Impress 10 N IP addresses of N 4 Impress servers RLP Server 11 N IP addresses of N 4 RLP servers Hostname 12 N N bytes of client host name Boot Size 13 2 2-octet Integer size of boot file RESERVED 128-254 - Reserved for site specific use Figure Types and contents of items in the VENDOR-SPECIFIC AREA of a BOOTP reply that have variable lengths. parameters for each host and then store the information in a BOOTP server configuration file BOOTP does not include a way to dynamically assign values to individual machines. In particular a manager must assign each host an IP address and must configure the server so it understands the mapping from host identifier to IP address. Static parameter assignment works well if computers remain at fixed locations and a manager has sufficient IP addresses to assign each computer a unique IP address. However in cases where computers move frequently or the number of physical computers exceeds the number of available IP host addresses static assignment incurs excessive overhead. To understand how the number of computers can exceed the number of available IP addresses consider a LAN in a college laboratory that has been assigned a 24 address that allows up to 254 hosts. Assume that because the laboratory only has seats for 30 students the college schedules labs at ten different times during the week to accommodate up to 300 students. Further assume that each student carries a personal notebook computer that they use in the lab. At any given time the net has at most 30 active computers. However because .

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