How will LANeye benefit from this?

TCP offers reliable, peer-acknowledged, ordered, session-based connectivity between two hosts. This means, that it may operate with other, unreliable, protocols in the lower layers and that this shouldn't affect the communication from the application layer perspective.

Each side can terminate the session. The second side is supposed to acknowledge that. TCP is widely used by protocols and applications that require high reliability. One program just sends some packages to another, without creating any kind of relation between them. On the other hand, it doesn't provide such reliability as TCP.

Transport Layer

It doesn't provide reliable in-order delivery. Resource Reservation Protocol allows for reservation of resources across a network. RSVP can reserve bandwidth for one-to-one and one-to-many transmissions. Stream Control Transmission Protocol allows sending multiple streams of data through one stream. It ensures reliable and in-order transmission with congestion control, similarly to TCP, but allows sending related data streams together in the same messages.

1-2: The TCP/IP family of Internet protocols

In general, SCTP is quite a powerful protocol. The files remounted from the individual packets are passed to the application layer by the transport layer, just underneath Figure The transport layer manages, among other things, the fragmentation of the files it receives from the application layer into packets, that are then passed to the Internet layer, and the remounting of packets received from the Internet layer see Figures and , to yield files that are passed to the application layer. Let us follow the path of an hypothetical file an e-mail message, just as a matter of example from computer A to computer B Figure The file is then passed down to the Transport layer for the fragmentation in packets.

MAC Addressing

The physical layer is where the packets physically move, by using ethernet cables, satellites, fibers, wireless systems, depending on what is available between computer A and B. If the computers are in the same room, they might connect through a couple of ethernet cables with a router in between, or maybe wirelessly, if the computer are connected via wireless to the same router.

  • Network Layers Explained: OSI & TCP/IP Models [with examples].
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  • Overview of TCP/IP and the Internet!
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The packet, thanks to the routers, will find the correct route from A to B. It is worth reminding that not all packets will take the same route, as at any given time a particular route among the various available connections on the Internet are redundant, remember? A moment later, maybe when the next packet is sent, this might change and the best route will be different.

Which tcp/ip model layer would a mac address be found? - Specialties

In computer B, packets will travel up from the physical layer, to the Internet layer and then to the transport layer that re-assembles the packets into the original file, the e-mail that was sent from computer A. This is of course a simplified scheme where quite a few details were intentionally omitted did we mention there must be a mail server in between A and B for instance? You can find an exhaustive list and detailed information here.

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For the purpose of this tutorial, you can think of it as a big table with two columns and several rows. Each row contains a domain name in the first column and an IP address in the second column. Domain Name Servers can, on request, read this table and translate a domain name with the corresponding IP, that is then used for processing network requests.


Domain names are a semantical layer that sit on top of the IP addresses system. DNS links the names layer with the IP layer. DNS is used every time you and the other billions of Internet users visit a website by using a domain name. Every time the same people send an e-mail at an address like bill domain-name. So it is one of the foundations of the Internet as we use it every day. It associates various information with domain names assigned to each of the participating entities.

A Domain Name Service resolves queries for these names into IP addresses for the purpose of locating computer services and devices worldwide. By providing a worldwide, distributed keyword-based redirection service, the Domain Name System is an essential component of the functionality of the Internet.

You may have noticed, on configuring internet access for a device that DNS is indeed one of the parameters you should somehow deal with. Internet addresses or Uniform Resource Locators URLs will be discussed in detail in a subsequent chapter of this book. In the image below we show how the layers of the two models relate to each other.

title=Structure of the Internet: TCP IP protocol stack

Therefore the MAC address is a property of a network interface rather that of a device itself a computer, a router, your connected fridge or toaster. Therefore three different MAC addresses can potentially be associated to this computer. For example, the computer will use a different MAC address if connected through an ethernet cable rather than through WiFi.