Filter
Top Products
70
AXIS 241Q/241S - Glossary
computers. A computer running a server program is also frequently referred to as a server. In practice, the server may
contain any number of server and client programs. A web server is the computer program that supplies the requested HTML
pages or files to the client (web browser).
SMTP (Simple Mail Transfer Protocol) - Used for sending and receiving e-mail. However, as it is "simple," it is limited in its
ability to queue messages at the receiving end, and is usually used with one of two other protocols, POP3 or IMAP. These
other protocols allow the user to save messages in a server mailbox and download them periodically from the server.
SMTP authentication - An extension of SMTP, where the client is required to log into the mail server before or during the
sending of email. It can be used to allow legitimate users to send email while denying the service to unauthorized users, such
as spammers.
SNMP (Simple Network Management Protocol) - SNMP forms part of the Internet Protocol suite, as defined by the Internet
Engineering Task Force. The protocol can support monitoring of network-attached devices for any conditions that warrant
administrative attention.
Sockets - Sockets are a method for communication between a client program and a server program over a network. A socket
is defined as "the endpoint in a connection". Sockets are created and used with a set of programming requests or "function
calls" sometimes called the sockets application programming interface (API).
SSL/TSL
(Secure Socket Layer/Transport Layer Security) - These two protocols (SSL is succeeded by TSL) are cryptographic
protocols that provide secure communication on a network. SSL is commonly used over HTTP to form HTTPS, as used e.g. on
the Internet for electronic financial transactions. SSL uses public key certificates to verify the identity of the server.
Subnet & subnet mask - A subnet is an identifiably separate part of an organization's network. Typically, a subnet may
represent all the machines at one geographic location, in one building, or on the same local area network (LAN). Having an
organization's network divided into subnets allows it to be connected to the Internet with a single shared network address.
The subnet mask is the part of the IP address that tells a network router how to find the subnet that the data packet should be
delivered to. Using a subnet mask saves the router having to handle the entire 32-bit IP address; it simply looks at the bits
selected by the mask.
Switch - A network device that connects network segments together, and which selects a path for sending a unit of data to
its next destination. In general, a switch is a simpler and faster mechanism than a router, which requires knowledge about
the network and how to determine the route. Some switches include the router function. See also Router.
TCP (Transmission Control Protocol) - TCP is used along with the Internet Protocol (IP) to transmit data as packets between
computers over the network. While IP takes care of the actual packet delivery, TCP keeps track of the individual packets that
the communication (e.g. requested a web page file) is divided into, and, when all packets have arrived at their destination, it
reassembles them to re-form the complete file.
TCP is a connection-oriented protocol, which means that a connection is established between the two end-points and is
maintained until the data has been successfully exchanged between the communicating applications.
Telnet - Telnet is a simple method with which to access another network device, e.g. a computer. The HTTP protocol and the
FTP protocols allow you to request specific files from remote computers, but do not allow you logon as a user of that
computer. With Telnet, you log on as a regular user with whatever privileges you may have been granted for specific
applications and data residing on that computer.
Time-lapse recorder - This type of video recorder is commonly used in the security industry and has the ability to record up
to one week of video on a single tape. The most commonly used timing is the 24-hour mode. Having to change tapes only
once a day and retaining large amounts of information are perceived as key advantages in using this particular mode of
recording.
UDP (User Datagram Protocol) - UDP is a communications protocol that offers limited service for exchanging data in a
network that uses the Internet Protocol (IP). UDP is an alternative to the Transmission Control Protocol (TCP). The advantage
of UDP is that it is not required to deliver all data and may drop network packets when there is e.g. network congestion. This
is suitable for live video, as there is no point in re-transmitting old information that will not be displayed anyway.
Unicast - Communication between a single sender and a single receiver over a network. A new connection is established for
each new user. See also Multicast.
UPnP
TM
- A set of computer network protocols that allows the automatic peer-to-peer detection of devices on the network.
UPnP is promoted by the UPnP Forum.
URL (Uniform Resource Locator) - An "address" on the network.