IP Services

ARP
On a local area network (LAN), a host or network device must learn the IP address of the destination host or device before sending data to it. Additionally, the host or network device must learn the physical address (MAC address) of the destination host or device because IP packets must be encapsulated into frames for transmission over a physical network. Therefore, the mapping from an IP address into a physical address is required. Address Resolution Protocol (ARP) is introduced to map IP addresses to physical addresses (Ethernet MAC addresses).
ND
To filter invalid packets, you can create ND entries, binding the destination IPv6 addresses of these invalid packets to nonexistent MAC addresses.
DNS
TCP/IP provides domain name system (DNS) to identify hosts using character strings in addition to their IP addresses. DNS uses a hierarchical naming scheme to specify a meaningful name for a network device. Mappings between domain names and IP addresses are established on a DNS server. DNS allows users to use meaningful and easy-to-remember domain names instead of IP addresses to identify devices.
Loopback Interface
A loopback interface is a logical interface that is always Up. A loopback interface is usually used in a loopback test.

Parent topic: Advanced Services