Innoband 4000-R2 User Manual page 67

All data inbound and outbound must pass through the firewall for inspection.
Full Duplex: Data transmission can be transmitted and received on the same signal medium and at
the same time. Full Duplex lines are bidirectional.
Half Duplex: Data transmission can be transmitted and received on the same signal medium, but not
simultaneously. Half Duplex lines are bidirectional.
Host: In context of Internet Protocol, a host computer is one that has full two way access to other
computers on the Internet.
IP: Internet Protocol: The method by which information is sent from one computer to another through
the Internet. Each of these host computers have a unique IP address which distinguishes it from all the
other computers on the internet. Each packet of data sent includes the sender's IP address and the
receiver's IP address.
LAN: Local Area Network: A group of computers, typically covering a small geographic area, that
share devices such as printers, hard disk drives, scanners, and optical drives. Computers in a LAN
typically share an internet connection through some sort of router that connects the computers to a
WAN.
MAC Address: Media Access Control Address: A unique hardware number on a computer or device
that identifies it and relates it to the IP address of that device.
MC: Multicast: Communication involving a single sender and multiple specific receivers in a network.
MTU: Maximum Transmission Unit: The largest size packet that can be sent by the modem. If the
network stack of any packet is larger than the MTU value, then the packet will be fragmented before
the transmission. During the PPP negotiation, the peer of the PPP connection will indicate its MRU and
will accept any value up to that size. The actual MTU of the PPP connection will be set to the smaller of
the two (MTU and the peer's MRU).
Ping: Packet Internet Groper: A utility used to determine whether a particular device is online or
connected to a network by sending test packets and waiting for a response.
PPP: Point-to-Point Protocol: A method of transporting and encapsulating IP packets between the user
PC and the ISP. PPP is full duplex protocol that is transmitted through a serial interface.
Proxy: A device that closes a straight connection from an outside network (WAN) to an inside network
(LAN). All transmissions must go through the proxy to get into or out of the LAN. This makes the
internal addresses of the devices in the LAN private.
Subnet Mask: Short for Sub-Network Mask, subnet mask is a technique used by the IP protocol to
filter messages into a particular network segment, called a subnet. The subnet mask consists of a
binary pattern that is stored in the client computer, server, or router. This pattern is compared with the
incoming IP address to determine whether to accept or reject the packet.
WAN: Wide Area Network: A WAN covers a large geographical area. A WAN is consisted of LANs and
the Internet is consisted of WANs.
WPA: Wi-Fi Protected Access (WPA) is a specification of standards-based, interoperable security
enhancements that increase the level of data protection and access control for existing and future
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