1. In a computer network, a Gateway is a server that forwards communication data from other servers. When receiving a request sent by a client, it handles the request just like a source server with its own resources. Sometimes, the client may not know that its communication target is the gateway.

2. The subnet mask is a bit mask, which indicates which bits of the IP address identify the network address where the host is located and which bits identify the host address.

Main interface type of extended data security gateway: RJ45 Number of main interfaces: 3 ports.

Main parameters: support protocols: TCP/IP protocol, ICMP protocol, RIPv2 protocol, static routing protocol, dynamic routing protocol, PAP protocol, CHAP protocol, NAT protocol and PPPoE protocol.

250K concurrent session, 7K/ s new session, 120Mbps, 40G firewall performance, 40g hard disk,100pvpn tunnel, 30Mbps 3DES encryption performance, 25,000 virus mails per hour,15,000 spam mails per hour,1MB/. Built-in firewall

Subnet mask function:

Subnet mask is a 32-bit address, which is a technology used in combination with IP address. It has two main functions. One is to mask a part of the IP address to distinguish the network identification from the host identification, and explain whether the IP address is on the local area network or on the remote network. The second is to divide a large IP network into several small subnets.

References:

Baidu encyclopedia-gateway

Baidu Encyclopedia-Subnet Mask