It relates the network today.

It sees and, then, today's material is [kochira] ↓↓ of [tto] Sala because it thinks that excellent sober is deep if having taken an examination of a person and a technical engineer who runs to [sumaa;] and recent network circumstances in the network system of today's topic.


Internet Protocol address of IPv6 is composed of 128 bits, and written as eight hexadecimal numbers delimited by “:" that is the colon sign in every 16 bits.

These sentences are correct.
- The biggest difference between IPv4 and IPv6 is in the length of the network address. IPv6 is 128 bits while IPv4 until the past was 32 bits.
- The numerical value written by the hexadecimal number is delimited by colon (:) in 16 bits and written because it becomes tedious too much in the mark similar to IPv4 in IPv6 when 128 bits are written.



Internet Protocol address of IPv6 is classified into three kinds (the unicast, the anycast, and the multicast).

These sentences are correct.
- Internet Protocol address given to interface of one unicast address. One interface is recognized. When a lot of interfaces (LAN board etc.) are being mounted by one computer, only the number of interfaces will have the unicast address.
- Address allocated in node of two or more multicast addresses. The packet transmitted to this address appropriating is delivered to the node that is reproduced and participates in this address. Address that starts by ffxx::. The unicast address is specified for the reply. The transmission origin must not relay the packet in the multicast address and do not relay the router.
- It looks like the multicast in the point that the address of one [enikyasutoadoresu] is allocated in two or more nodes, and the point "It is delivered only to one of the nearest nodes in the node that belongs there on the network" is different for [enikyasuto]. It doesn't exist, and when it is necessary, the broadcast address uses all node multicast address (ff02::1) for IPv6. It transmits specifying it for the reply by the unicast, and [enikyasuto] (anycast) address throws away the packet in the transmission origin to the router.



The Ipv6 equipment combines information notified from information and the router of the equipment and Internet Protocol address is generated in the [sute-toresu] automatic setting among an automatic setting mechanisms of IPv6.

These sentences are correct.
- The automatic setting in the address is possible as long as there is a router even if DHCP is not used in automatic address setting IPv6 (RFC 4862). The address where the attainment is sure to exist only in the link named linklocal address attaches to the network interface of the IPv6 node. You may set this by hand power if unique in the link though being generated from interface ID generated from the prefix and the MAC address named fe80:: is usual. Finally, unique in the address is solved based on DAD. Moreover, the router is regular or transmits information (Router advertisement; RA) on the network to the network that I connect based on the request. The IPv6 host generates a global address by using prefix information included in this information and unique interface ID. The IPv6 host can secure the connectivity to a global IPv6 network by setting the router that transmits received RA to the default route at the same time. However, because the address of the DNS server for the name resolution cannot be acquired in this mechanism, another mechanism such as DHCPv6 is needed for it.



The dual stack (dual IP layer) that is the coexistence technology of IPv4 and IPv6 is technologies that make the Ipv6 packet a capsule in the IPv4 packet.
These sentences are wrong.
- The dual stack is a technology that supports both IPv6 and IPv4 the host and the router protocols at the same time. These sentences are "IPv6 over IPv4 tunnel. "
- This hit is not understood easily because it is confusing. ｡｡｡
Both dual stack = IPv6 and IPv4 are made and the IPv6 packet is made a capsule in support IPv6 over IPv4 =IPv4. "** over xxxxx"'s coming out in various places though these sentences become explanations of "IPv6 over IPv4" because it says that the IPv4 packet will be made a capsule in IPv4 over IPv6 =IPv6 has "It is ** in xxxx" with the remembrance. ｡｡For instance, when it is Ethernet Over MPLS technology, I feel the Ethernet frame in MPLS as for encapsulation.



Well, another one special holiday ･･･ Then,




It economically becomes inefficiency in many cases though QoS on the Internet can be secured by the design that prepares a large installed capacity enough compared with the input traffic at the peak.

These sentences are correct.
- Well, the profit is not taken easily in cost [**] ..surplus.. [sonawayouryou] though certain reliability might rise.



There is a feature of being influenced by the others' flow besides the amount of the packet that the composition of the net sends and receives to oneself though the element of QoS on the Internet is an average rate, a peak rate, and a delay, etc. when a chain of packet flow are sent among hosts.

These sentences are correct.
- Naturally, the flow of other nodes will be influenced. ｡｡



The entire net can be efficiently used by identifying the flow that joins the same network, and assuming the common IP network where different QoS at each flow can be secured equipment.

These sentences are correct.
- As for efficiency in the design, it might be bad, and designing naturally at each flow might be better for efficiency even if it suddenly thinks about QoS on the network at a time.



In general, when the quality that each flow demands while attempting the prevention of congestion is controlled, and congestion is generated on the network, one of the purposes of the QoS control evenly distributes the influence of congestion to each flow.

These sentences are wrong.
- To reduce the influence of congestion in general when congestion is generated on the network, it is directed to interrupt the transmission temporarily at the transmitting end.
- If the adverse effect is distributed, it might be not good.
- When flow overflows, it is "The first interruption. "



Well, how?It is thought that becoming familiar is deep if the person challenged a technical engineer, and indispensable knowledge to CCNA or CCIP is feeling or it sleeps and, then, around here today though the material around here was written even at the beginning.