JDSU NT850 Betriebsanweisung PDF herunterladen (Seite 98)

Appendix A Glossary of Network Terms and Internet Protocols

Internet Protocol Definitions

82 LanScaperPRO Network Tester User’s Guide

ISP (Internet Service Provider)

Commercial supplier of access mechanisms for public

access to the internet.

LAN (Local Area Network)

Connection mechanism for a business, home, school, or

any group of devices to communicate with each other. In

the LanScaperPRO case, it is a group of computers,

printers, routers, and possibly other devices connected by

Ethernet. Distinct from the WAN due to the IP addressing

in a "Subnet".

Network Mask (Subnet Mask)

IP addressing scheme that divides the entire IP address

network into smaller sections (Subnets.) In the LanScap-

erPRO use, the Network mask is used to identify an IP

address as being located either on the LAN (local subnet)

or on the Internet, and therefore accessed over the WAN.

PING (Packet INternet Groper)

A simple communication protocol (ICMP Echo) used to

request an echo back from an addressed device (target).

The LanScaperPRO uses this to verify IP connectivity

between itself and another device.

Router (Gateway)

If a device is attempting to communicate with an IP

address, and it finds that the target is not on it's local

network (by comparing the target address with it's own

address and the Netmask) the device must forward it's

request to a router. The router forwards the communica-

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JDSU NT850 Betriebsanweisung Seite 98