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SMTP, Simple Mail Transfer Protocol : In TCP/IP, this is an application for providing mail
delivery services.
SNMP , Simple Network Management Protocol : A set of protocols for managing networks.
SNMP works by sending messages to different parts of a network. SNMP-compliant devices,
called agents, store data about themselves in Management Information Bases (MIBs) and return
this data to the SNMP requesters.
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.
SSH, Secure Shell : A service that provides strong authentication and allows for secure
communications over insecure channels.
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's 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 the 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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