Fortinet FortiGate 50A User Manual download pdf (Page 261)

Glossary

FortiGate-50A Installation and Configuration Guide 261

SSH, Secure shell: A secure Telnet replacement that

you can use to log into another computer over a

network and run commands. SSH provides strong

secure authentication and secure communications

over insecure channels.

Subnet: A portion of a network that shares a common

address component. On TCP/IP networks, subnets are

defined as all devices whose IP addresses have the

same prefix. For example, all devices with IP

addresses that start with 100.100.100. would be part of

the same subnet. Dividing a network into subnets is

useful for both security and performance reasons.

IP networks are divided using a subnet mask.

Subnet Address: The part of the IP address that

identifies the subnetwork.

TCP, Transmission Control Protocol: One of the

main protocols in TCP/IP networks. TCP guarantees

delivery of data and also guarantees that packets will

be delivered in the same order in which they were sent.

UDP, User Datagram Protocol: A connectionless

protocol that, like TCP, runs on top of IP networks.

Unlike TCP, UDP provides very few error recovery

services, offering instead a direct way to send and

receive datagrams over an IP network. It is used

primarily for broadcasting messages over a network.

VPN, Virtual Private Network: A network that links

private networks over the Internet. VPNs use

encryption and other security mechanisms to ensure

that only authorized users can access the network and

that data cannot be intercepted.

Virus: A computer program that attaches itself to other

programs, spreading itself through computers or

networks by this mechanism usually with harmful

intent.

Worm: A program or algorithm that replicates itself

over a computer network, usually through email, and

performs malicious actions, such as using up the

computer's resources and possibly shutting the system

down.

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Fortinet FortiGate 50A User Manual Page 261