četvrtak, 09.02.2012.
MCSA test Headers IPv4 Packet Upper-Layer Protocol Data Unit
70-662 Exam Dual IP layer With dual layer addressing, both the IPv4 and IPv6 protocols access the identical information in the exact same TCP/IP stack. This translates that the network portion contains both the IPv4 and IPv6 implementations, plus they both access the exact same transport layer. So, irrespective of whether a packet is dispatched via IPv4 or IPv6, it passes through the same area. This technology is supported by Windows Vista and Windows Server 08.
Dual stack Dual stack implementations change from dual IP layer implementations for the reason that dual stack creates an entire separate stack through which often each protocol travels. What this means for network administrators is that routers will have to support both the IPv6 together with IPv4 protocols. And, of course, each of these stacks has its very own transport layer that inter- faces along with the application layer. By default, if you ever install IPv6 support for Or windows 7 and Windows Server 2003, even though operating systems will make use of a separate stack, where the settings will be de? ned by tcpip6. sys.
Both dual stack and dual layer implementations get a little tricky when you start to throw in the confusing factor for almost any normal and well-functioning multilevel: DNS. DNS, as I'll go into in the? Naming Events for Windows Server 08? section of this chapter, relies upon the usage of records and aliases to help translate addresses into labels. Unfortunately, the record types for IPv4 and IPv6 are completely different. Thus, you have to take care of records for both types of implementation.
If you've ever arrange a VPN connection just before, you've used a type of tunnel. Tunneling is practise of placing a protocol or piece of information within another protocol that serves as being the primary method of connection. With VPNs, when you choose Point-to-Point Pro- tocol (PPP) to plug via the Internet for your internal network, you're using the VPN as a canal to transmit data via TCP/IP, where the server spots you as remotely connected across the network.
When working with IP transitional tunneling, you're doing something very similar. In effect, you're taking IPv6 information and passing it through IPv4 with the addition of on a header. Creatively, an IPv6 over IPv4 packet looks like Figure 2. 11.
This can be achieved by one with two ways, each with several customer con? gura- tions. Primary, it can be achieved by manual Configuration. And second, it can be performed auto- matically. Con? gured and automatic tunnels can be con? gured in many different ways; in particular, this manually con? gured tunnels can be con? gured by while using netsh interface ipv6 increase v6v4tunnel command. Accordingly, every device that's con- nected on this network layer is logically connected in some fashion. Thus, every host and router (both of which can handle understanding the network protocol) should have a way of communicating with each other. However, this varies with each device. In some sort of tunnel, this breaks down to three types of communication between devices:
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