2. About Peer-to-Peer(P2P) System The model of “Peer-to-Peer” system, no server Server-based service model A Peer-to-Peer system is one of network system. Computers connecting other computers by P2P system distribute data between them without any servers. It is often used to share files. More computers connected, they can send data faster than server-based service. But, there are some users they uses this system to share files which has copyright out of law.

3. An UPS (Uninterruptible power supply), also known as a battery backup. A UPS, however, can be used to provide uninterrupted power to equipment, typically for 5 to 15 minutes until an auxiliary power supply can be turned on, utility power restored, or equipment safely shut down. Auxiliary devices such as UPS can have a management agent and specific MIB. About UPS

4. About MIB MIB is composed of the set of the object in the data base that manages substance in the network.MIB is a kind of the data base to manage the device in the communication network.Object of MIB is Subset of Abstract Syntax Notation One.MIB has the part that the standards body such as IETF defines and the part that corporate others define.

5. About SNMP SNMP(simple network management plotocol) is plotocol for the watch program. It is difficult to understand the situation of a lot of computer on a huge network. So imformation from the computer is collected by this plotocol, and it observes and controls. The router and bub can be obsreved by this plotocol, lile a computer.

6. References ・ Wikipedia http://en.wikipedia.org/wiki/Main_Page