The preceding several chapters covered specific server types or coherent groups of server types, such as mail servers and remote access servers. Many servers, though, don't fall neatly into coherent categories but nonetheless deserve some description. This chapter covers them, or at least three of them:

• Dynamic Host Configuration Protocol (DHCP) servers, which enable a computer to dole out IP addresses and related information to other computers. Running a DHCP server can reduce the administrative burden of a network with more than a handful of computers.

• Domain Name System (DNS) servers, which deliver IP addresses to computers when given hostnames, or vice versa. You may need to run a DNS server if you run your own domain or have a fairly plain type of Internet access. Even if you don't need to run a DNS server, doing so can be helpful if you want to give names to your local computers or if you want to improve the speed of DNS lookups.

• Network Time Protocol (NTP) servers, which help keep computers' clocks synchronized with each other and with an external time source. NTP is helpful or even necessary for some protocols, such as Kerberos, that assume different systems' clocks don't deviate significantly from each other. It can also be important when comparing log files across computers in the event of a security breach or other problem; if both systems use NTP, time stamps shouldn't vary between them by more than tiny amounts, thereby simplifying log comparisons.

Team LIB

Team LIB

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