NCD terminals require that host computers residing on the network provide the following services. Some of the following are optional or depend on the network configuration:

• Address discovery service-provides terminals with their network addresses and other information at boot time. You can use BOOTP/DHCP or RARP for address discovery, or you can store addresses in NVRAM.
  
  For information on address discovery services and storing information in NVRAM, see Chapter 3, Booting-Address Discovery.
  

• Subnet mask discovery service-provides the terminal with the subnet mask (if your network uses subnetting) when it boots. Most versions of BOOTP/DHCP allow you to enter the subnet mask in the database file. The alternatives to BOOTP/DHCP are ICMP (Internet Control Message Protocol), which is included in the TCP/IP protocol family, or storing the subnet mask in NVRAM.
  
  For information on the subnet mask, see Chapter 3, Booting-Address Discovery.
  

• X server download service-NCD terminals use TFTP or NFS for downloading an X server file.
  
  For information about downloading X servers from the network, see Chapter 4, Booting-X Server Loading. For basic information on starting and configuring TFTP and NFS, see "Configuring How a Terminal Accesses Files".
  
  For information on loading an X server locally from a PCMCIA card, see the NCDware System Administrator's Guide for UNIX Systems.
  

• File service-NCD terminals use TFTP or NFS for accessing files on network hosts during normal operation and at boot time.
  
  For information on configuring the file service, see "Configuring How a Terminal Accesses Files".
  
  For information on accessing local files on a PCMCIA card or diskette, see the System Administrator's Guide.
  

• Address resolution service-The Address Resolution Protocol (ARP) translates between hardware addresses and IP addresses. Translations can also be configured manually.
  
  For information on address resolution, see "Configuring the ARP Cache (Resolved Addresses)".
  

• Name service-By using a name service, you can specify hostnames instead of network addresses in terminal configuration parameters or in commands that require a network address. NCD terminals can use either the IEN 116 (Internet Engineering Notes) name service or the Domain Name System (DNS). You can also store translations in a terminal's local name cache.
  
  For information on name service, see "Using a Name Service".