DNS on the USG2000 and USG5000 series

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A Domain Name System (DNS) is a host naming mechanism in character string format of TCP/IP to establish the mapping between domain names and IP addresses. It is a mechanism of mapping easy-to-remember and meaningful domain names to IP addresses recognizable for network devices.

Other related questions:
SLB on the USG2000 and USG5000 series
SLB refers to server load balancing.

IPSec on the USG2000 and USG5000 series
Designed by Internet Engineering Task Force (IETF), IPSec is an open network-layer framework protocol. It is not a single protocol, but a collection of protocols and services that provide security for IP networks.

IPSec content on the USG2000 and USG5000 series
IPSec includes security protocols such as Authentication Header (AH) and Encapsulating Security Payload (ESP), Internet Key Exchange (IKE), and certain algorithms used for authentication and encryption.

SLB algorithms for the USG2000 and USG5000 series
The load balancing algorithm refers to the algorithm based on which the firewall allocates service traffic to the physical server. The allocation result varies with the algorithm.

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