It is a network system today.

Well, only a little though it is said that the chief telecommunications engineer is studied today because time cannot be so taken today ・・・ Then, today's material is [kochira] ↓↓.



- Function of router etc.



There are [sutatei;kkuru-chingu] and [dainamikkuru-chingu] in a typical [ru-chingu] technique in the router. ICMP is a typical protocol to exchange [ru-chingute-buru] information with [dainamikkuru-chingu] regularly.

These sentences are wrong.
- The protocol that regularly exchanges [ru-chingute-buru] information is [ru-chingupurotokoru], and, for instance, [ru-chingupurotokoru] called RIP and OSPF is used for the TCP/IP network. ICMP is a protocol that is used between the router and the computer, and provides for the method of inquiring information concerning the state of IP and details of the code value. - ICMP …_ :. |~|0ICMP is PING if it says. 。。



In the router, two or more private IP addresses in a local network use the port number and the MAC address, and are used for the IP masquerade as a function to convert into one global IP address at the same time.

These sentences are wrong.
- Two or more private IP addresses in a local network combine the TCP/UDP port number with NAT, and are used for the IP masquerade as a function to convert into one global IP address at the same time. - It doesn't convert in the port number and the MAC address, and it converts it by the port number and Internet Protocol address though the IP masquerade comes to be able certainly to share one global address by two or more hosts.



Filtering with the network address unit and the control of the IP packet at the port number level can be done, and to forward only a specific IP packet, the filtering function in the router can be limited.

These sentences are correct.
- The access list is spoken. The refusal of the street of each packet can be set by identifying the content of the IP packet.



It is both said by the router and three layer switches that the one of the router and the software subject is three layer switches the one of the hardware subject with the device only for the [ru-chingu] processing in OSI reference model's network layer.

These sentences are wrong.
- The one of the hardware subject that uses special IC for specific is called the one of three layer switches and the software subjects is routers.
- Three layer switches are the hardware bases though routing is done, and the router does routing with the software base though it is thought it is safe if it reads neatly.



♪ then around here today today then ..no so much play on holiday.. ..taking the time of study neatly...