Well, chief telecommunications engineer's examination measures are done today. The problem related to the ATM thinks the subject of the transmission exchange and the plant management for you should make efforts and to finally exist because it is set questions at excellent frequency this time though it is a problem of a special field that tentatively handles a lot by this blog though it is a problem related to the ATM. Then, today's material is [kochira] ↓↓.
- ATM layer service
CBR is service that provides PCR(Perk Cell Rate), and guarantees CTD(Cell Transfer Delay), CDV(Cell Delay Variation), and the cell loss ratio.
These sentences are correct.
- CBR (Constant Bit Rate: constant bit rate): PCR (peak cell rate) is provided, and it is suitable for forwarding service and circuit switching services that guarantee CTD (cell transfer delay) and CDV and the cell loss ratio.
It doesn't make amends for the cell loss ratio though VBR is service to which SCR(Sustainable Cell Rate) and MBS(Maximum Burst Size) besides PCR are provided, and an image forwarding and an accumulative voice/data communication that uses the changeable speed sign assume it.
These sentences are wrong. - VBR (Variable Bit Rate: changeable speed service): SCR (average cell rate) besides PCR (peak cell rate) and MBS (maximum burst-length) are provided, and there are two categories of nrt-VBR for rt-VBR and the accumulation communication for serve real-time communication to which an image forwarding and an accumulative voice/data communication that uses the changeable speed sign are assumed and the cell loss ratio are guaranteed. - "The cell loss is secured. " though there are rough sentences.
It is a file transfer and service that is appropriate for the application of the transmission of the non-real-time data of E-mail etc. though not warranted the quality basically by UBR.
These sentences are correct.
- UBR (Unspecified Bit Rate): The file transfer and it serves that is appropriate for the application of the transmission of the non-real-time data of E-mail etc. though it doesn't warrant the quality basically.
ABR is to be adjusted the speed to install between MCR and PCR after MCR(Minimum Cell Rate) is secured by using RM cell (Resource Management Cell) to convenient service for the user who wants to use the bandwidth of becoming empty as much as possible.
These sentences are correct.
- From to install between MCR and PCR after MCR is guaranteed by using the transmission speed and RM (resource management) cell of the band that can be used, the speed is adjusted ABR (Available Bit Rate: bit rate that can be used): to convenient service for the user who wants to use the bandwidth of becoming empty as much as possible it.
How? It is confused and it divides, and refer the font color of the becoming it part in "Red", please the point the frequent occurrence of the term that looks like though it is a problem of the ATM (asynchronous transfer mode) though instigating it. An easy-to-use a little more in case of preserve it in the text editor or Excel duck because this blog is not thought to be terrible the table because right and left width of the article is narrow and to see easily. Then, around here today.
2010/09/02
2010/09/01
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
- 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
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