MCIPT Administration and Delegation Features Summary
Teredo is also known as Network Address Translator Traversal (NAT-T). What it does is provide a unicast address for each device located within the NAT pool. It does this by sending out IPv6 data over Uniform Data Protocol (UDP). In some ways, it’s actually fairly similar to 6to4 tunneling. However, if you’ll remember from the earlier discussion of 6to4, 6to4 requires a router to be used that comprehends 6to4 routing in order to get past its par- ticular subnet. Instead of using a router to translate out the NAT pool, Teredo uses host-to- host communication and establishes a tunnel directly between two individual hosts.
For your exam, the most important point you need to remember about Teredo is the pro- cess it uses for the initial Configuration and communication between clients. Beyond that, Teredo is quite complex and uses a series of XOR operations to determine a unique address; then it also creates a randomly generated MCITP Exams series of numbers and a ?ag field for security pur- poses. So, it’s unlikely you’ll be asked to manually con?gure a Teredo address. However, the process breaks down into two portions: initial client Configuration and initial client communication.
1. The client sends a router solicitation request (RS) to a Teredo server with the cone flag (a high-order bit that indicates a device is behind a NAT) set.
2. The Teredo server responds with a router advertisement (RA) from a router that is on an alternate IPv4 address so it can determine whether the address is behind a NAT.
3. If the RA is not received, the client repeats the RS with the cone flag not set.
4. The server responds with an RA from the source address to the destination address. If the client receives the RA, it is behind a restricted NAT.
5. To make sure there isn?t a symmetric NAT in place, the client sends another RS to an alternate server.
6. The alternate server responds. If the RAs are different, the map is mapping the same internal address and UDP port number, and Teredo will not be available.
Teredo has several different processes of MCITP Certifications initial communication based on what type of NAT the client is assigned under. The most commonly referenced one of these is a situation where a client resides on a restricted NAT. In which case, the process of two computers, A and B, communicating is as follows:
1. Client A sends a bubble packet to Client B.
2. Client A sends a bubble packet to Client B through Client B?s Teredo server.
3. Client B?s Teredo server forwards the packet to Client B.
4. Client B responds to the packet with its own bubble packet to Client A.
5. Client A determines NAT mappings for both NATs.
Legacy Networking and Windows Server 2008
Although it would be nice if we existed in a world where all technology was upgraded instantly at the same time and there were never any issues switching back and forth between technologies and we could just link with IPv6, that world simply doesn?t exist. In fact, even before IPv4 and the current networking situation, the world of networks wasn?t exactly laid out in perfect order.
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This MCITP Certificate is generally a vendor-certification supplied by schools and universities to IT specialists after efficiently completing a network course. This course is especially about network security and administration.
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