Siemens EF 711 Series Betriebsanweisung PDF herunterladen (Seite 477)

Glossary

SCALANCE WLC711

User Guide, V8.11, 07/2012, C79000-G8976-C260-03 A-7

MIB Management Information Base is a formal description of a set of network objects that can be

managed using the Simple Network Management Protocol (SNMP). The format of the MIB is

defined as part of the SNMP. A MIB is a collection of definitions defining the properties of a

managed object within a device. Every managed device keeps a database of values for

each of the definitions written in the MIB. Definition of the MIB conforms to RFC1155

(Structure of Management Information).

MIC Message Integrity Check or Code (MIC), also called ‘Michael’, is part of WPA and TKIP. The

MIC is an additional 8-byte code inserted before the standard 4-byte integrity check value

(ICV) that is appended in by standard WEP to the 802.11 message. This greatly increases

the difficulty in carrying out forgery attacks.

Both integrity check mechanisms are calculated by the receiver and compared against the

values sent by the sender in the frame. If the values match, there is assurance that the

message has not been tampered with. (See WPA, TKIP and ICV).

MTU Maximum Transmission Unit. The largest packet size, measured in bytes, that a network

interface is configured to accept. Any messages larger than the MTU are divided into smaller

packets before being sent.

MU Mobile Unit, a wireless device such as a PC laptop.

multicast, broadcast, unicast Multicast: transmitting a single message to a select group of recipients. Broadcast: sending

a message to everyone connected to a network. Unicast: communication over a network

between a single sender and a single receiver.

NAS Network Access Server, a server responsible for passing information to designated RADIUS

servers and then acting on the response returned. A NAS-Identifier is a RADIUS attribute

identifying the NAS server. (RFC2138)

NAT Network Address Translator. A network capability that enables a group of computers to

dynamically share a single incoming IP address. NAT takes the single incoming IP address

and creates new IP address for each client computer on the network.

Netmask In administering Internet sites, a netmask is a string of 0's and 1's that mask or screen out

the network part of an IP address, so that only the host computer part of the address

remains. A frequently-used netmask is 255.255.255.0, used for a Class C subnet (one with

up to 255 host computers). The “.0” in the “255.255.255.0” netmask allows the specific host

computer address to be visible.

NIC Network Interface Card. An expansion board in a computer that connects the computer to a

network.

NMS Network Management System. The system responsible for managing a network or a portion

of a network. The NMS talks to network management agents, which reside in the managed

nodes.

NTP Network Time Protocol, an Internet standard protocol (built on top of TCP/IP) that assures

accurate synchronization to the millisecond of computer clock times in a network of

computers. Based on UTC, NTP synchronizes client workstation clocks to the U.S. Naval

Observatory Master Clocks in Washington, DC and Colorado Springs CO. Running as a

continuous background client program on a computer, NTP sends periodic time requests to

servers, obtaining server time stamps and using them to adjust the client's clock. (RFC1305)

Table A-1 Networking Terms and Abbreviations (continued)

Term Explanation

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