31
Subnet Mask
The subnet mask of the local area network.
Gateway
The IP address of the router on the local area network.
DNS Server
DNS
（
Domain Name System
）
, Penetrates the DNS system, We may look
up its IP by machine domain name, Also may instead look up its domain
name by machine IP
This entry is optional. Enter a DNS Server for the local network.
Figure 4-9
