American Fibertek SM9p - Manual (Page 127)

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address. For example, the domain name www.net.com might translate to
192.168.1.1.
 DNS2: The backup for DNS1. When the DNS1 cannot function, the DNS2 can
replace DNS1 immediately.
IP configuration interface
DHCP Configuration
It short for Dynamic Host Configuration Protocol that is a protocol for assigning dynamic
IP addresses to devices on a network. With dynamic addressing, a device can have a
different IP address every time it connects to the network. In some systems, the device's
IP address can even change while it is still connected. DHCP also supports a mix of static
and dynamic IP addresses. Dynamic addressing simplifies network administration
because the software keeps track of IP addresses rather than requiring an administrator
to manage the task. This means that a new computer can be added to a network without
the hassle of manually assigning it a unique IP address.