Siemens Server - Manual (Page 45)

Appendix
39
Ethernet address
The Ethernet address is the invariable, physical address of an Ethernet network component.
Firewall
Firewall describes network components which link an internal network (Intranet) to a public network
(e.g. Internet), similarly to a router. Here the access to the, in each case, other network can be
restricted or blocked completely depending on the access direction, the service used as well as the
authentication and identification of network users. Another performance feature may be the
encryption of data if e.g. the public network is only used as a transit means between two locally
separated sections of an Intranet.
FTP – File Transfer Protocol
FTP is a TCP/IP-based protocol, which allows the transmission of complete files between two
network users.
Gateway
Gateways connect – like also routers – different networks with each other. Whereas routers possibly
convert the physical type of the network (e.g. Ethernet/ISDN) but leave the actual protocol (e.g.
TCP/IP) untouched, Gateways allow to access networks with other protocols (e.g. TCP/IP on
Profibus). Thus a Gateway also has the task to translate different communication protocols.
HTML – Hypertext Markup-Language
Markup language which defines via keywords how to display the contents in the browser, where to
find multimedia elements and how to link which elements.
HTTP – Hypertext Transfer Protocol
The HTTP protocol is based on TCP and regulates the request for web contents and their transmission
between HTTP Server and Browser. Today HTTP is the mostly used protocol in the Internet.
Hub
A hub, which often is also called star coupler, allows the connection of several users in a star-type
network. Data packages received at one port are output equally at all other ports. In addition to hubs
for 10BaseT (10Mbits/s) and 100BaseT (100 Mbits/s), there are so-called auto sensing hubs which
detect automatically if the terminal equipment connected works with 10 or 100 Mbits/s.
ICMP – Internet Control Message Protocol
The ICMP protocol serves for the transmission of status information and error messages between IP
network nodes.
Internet
The Internet currently is the largest integrated network worldwide which provides the network users
connected with an almost unlimited communication infrastructure.
By using TCP/IP, the network users can call on services offered in the Internet such as e-mail, FTP,
HTTP, etc., independent of the platform.
Intranet
A closed network (e.g. within a company) in the limits of which the network users call on internet-
typical services such as e-mail, FTP, HTTP, etc. Normally, there is an interface from the Intranet to
the Internet via routers or firewalls.
IP – Internet Protocol
Protocol enabling the connection of users which are located in different networks.