It is large area EtherNet today.

Well, today's topic is large area EtherNet. It makes it in the communication relation of knowledge of Ethernet now, and [arukarakoso] [ki] of such a common sense problem is put and it makes it to a certain score source in engaged man though ..half common sense.. [bu]. Then, today's material is [kochira] ↓.




- Wide-area ethernet and IP-VPN



There is no use limitation in the protocol of layer 3 in the wide-area ethernet though the protocol that can be used is limited only to IP in IP-VPN.

These sentences are correct.
- Because IP-VPN uses IP as a protocol in the network layer as shown in the name, IPX or Appletalk is not choked.
- It doesn't dance ･･･.



IP-VPN uses the function of layer 3 as a mechanism of the data transfer while the wide-area ethernet uses the function of layer 2 as a mechanism of the data transfer.

These sentences are correct.
- Not speaking as shown in the above-mentioned.
- Layer 2 and IP-VPN use the function of layer 3 for the wide-area ethernet as a mechanism of the data transfer.



The main technology to achieve VPN on large area Ethernet includes the VLAN tagging technology and the Ethernet Over MPLS technology. Among these, the Ethernet Over MPLS technology is a technology that forwards the Ethernet frame on the MPLS network.

These sentences are correct.
- 　 Technology that sends and receives Ethernet packet on network constructed with MPLS. It is a mechanism that the MPLS network is passed adding the label of MPLS to the Ethernet packet. 　There is an advantage that all the protocols used on Ethernet can be used because the packet of Ethernet can be sent and received directly between networks through EoMPLS though it is chiefly a protocol for the VPN construction as well as MPLS by the same sense as past LAN. Moreover, because the MPLS network for TCP/IP can be misappropriated as it is, the equipment load of the provider is comparatively suppressed.
- Well, the Japanese syllabary as shown in the name.



How?Even if the large area is said, usual EtherNet and the idea are the same as the idea. Making a mistake perhaps if the reference model of OSI is calmly judged is a problem of it not is. However, the problem of becoming such a score source when becoming a real thing of the examination also lacks and drops calm ･･･ It takes care. Then, ↓ by another question.




- Basic technology of Ethernet



In the CSMA/CD method that is the access control method, even if one node breaks down, it doesn't influence the communication between other nodes.

These sentences are correct.
- It reels, one node breaks because it might become the topology of , star type, the way exists, and there is no influence.



In general, it is called a broadcast roughhouse that it becomes impossible to generate an infinite loop by the broadcast packet on the network, and to communicate the user.

These sentences are correct.
- You may feel it for infinite loop = broadcast roughhouse on the network.



Only the symmetry of the auto negotiation function of 1000BASE-X is the between the same methods (SX and LX, etc.), and the auto negotiation function doesn't operate between different methods (SX and LX, etc.).

These sentences are correct.
- If it is not the same method, an auto negotiation of 1000BASE-X is not good.



A transparent bridge does the relay processing of the communication that shuts in one segment because it doesn't judge whether to do the relay processing between each segment.

These sentences are wrong.
- The relay processing cannot be done about the communication that shuts in one segment.
- The segment of an access control method the transparent bridge = same ties. For instance, it is easy to understand neither these problem sentences of * somehow nor explanations Ethernet, Ethernet, FDDI, and FDDI it.



Thank you it is a strange explanation. ｡｡As for sentences wrong apart from correct sentences, a transparent bridge is "Bridge. " to the end. Two segments' tying doesn't forget the thing in the work of the bridge. Then, around here today