HP OfficeConnect Firewall Series Bedienungsanleitung PDF herunterladen (Seite 149)

OfficeConnect Gigabit VPN Firewall User’s Manual Appendix 22. OBTAINING SUPPORT FOR YOUR PRODUCT

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IP address and current network conditions. A device that

performs routing is called a router.

rule See filtering rule, NAT rule.

SDNS Secondary Domain Name System (server)

A DNS server that can be used if the primary DSN server

is not available. See DNS.

SNMP Simple Network Management Protocol

The TCP/IP protocol used for network management.

subnet A subnet is a portion of a network. The subnet is

distinguished from the larger network by a subnet mask

which selects some of the computers of the network and

excludes all others. The subnet's computers remain

physically connected to the rest of the parent network, but

they are treated as though they were on a separate

network. See also network mask.

subnet mask A mask that defines a subnet. See also network mask.

TCP See TCP/IP.

TCP/IP Transmission Control Protocol/Internet Protocol

The basic protocols used on the Internet. TCP is

responsible for dividing data up into packets for delivery

and reassembling them at the destination, while IP is

responsible for delivering the packets from source to

destination. When TCP and IP are bundled with higher-

level applications such as HTTP, FTP, Telnet, etc.,

TCP/IP refers to this whole suite of protocols.

Telnet An interactive, character-based program used to access a

remote computer. While HTTP (the web protocol) and

FTP only allow you to download files from a remote

computer, Telnet allows you to log into and use a

computer from a remote location.

TFTP Trivial File Transfer Protocol

A protocol for file transfers, TFTP is easier to use than

File Transfer Protocol (FTP) but not as capable or secure.

TTL Time To Live

A field in an IP packet that limits the life span of that

packet. Originally meant as a time duration, the TTL is

usually represented instead as a maximum hop count;

each router that receives a packet decrements this field

by one. When the TTL reaches zero, the packet is

discarded.

twisted pair The ordinary copper telephone wiring long used by

telephone companies. It contains one or more wire pairs

twisted together to reduce inductance and noise. Each

telephone line uses one pair. In homes, it is most often

installed with two pairs. For Ethernet LANs, a higher

grade called Category 3 (CAT 3) is used for 10BASE-T

networks, and an even higher grade called Category 5

(CAT 5) is used for 100BASE-T networks. See also

10BASE-T, 100BASE-T, Ethernet.

upstream The direction of data transmission from the user to the

Internet.

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