HTTP is in the Application layer of the Internet protocol suite model and in the Session Layer of the OSI Model. The Session layer of the OSI Model is responsible for creating and managing sessions and is the first layer that passes data. HTTP can redirect sessions, reuse them and have persistent connections.

2017年2月1日 · Physical layer (in original OSI model) is just your cables and network equipment. Pretty much the only people who still talk about OSI is network techs. They may still say Layer 2 or Layer 3 switches, etc which is in reference to OSI.. Layer 2 is an ethernet switch, a layer 3 switch adds routing.

2013年4月21日 · Layer 3 is the IP layer, which carries information about where in the whole network the packet is from and to, not just the current hop. The transmission would go like this: Machine A wants to send a packet to Machine B. Machine A knows Machine B's IP address, so it places that in the layer 3 packet.

2023年6月8日 · My understanding of a hub is that it is just a repeater with multiple outputs but looking at the exam we are gonna take the right answer of which layer a hub is on is always layer 2. Question: Since the internet pretty much unanimous agrees that a hub is operating on layer 1 I wonder what arguments can be made for it operating on layer 2.

2014年2月12日 · In OSI stack terms, DNS runs in parallel to HTTP in the Application Layer (layer 7). DNS is in effect an application that is invoked to help out the HTTP application, and therefore does not sit "below" HTTP in the OSI stack. DNS itself also makes use of UDP and more rarely TCP, both of which in turn use IP.

2013年1月3日 · HTTP, SSL, HTTPS, WebSockets, etc. are all application layer protocols. But the OSI protocol stack doesn't apply to TCP/IP, which has its own layer model: same names, different functions. It isn't helpful to keep using the obsolete OSI stack as though it actually reflected any reality. It doesn't.

2012年2月22日 · The term 'layer' fits well because Application Layer protocols like SMTP and HTTP can simply be layered on top of it. In the 4-layer IP Suite model, SSL/TLS is in the Application Layer, (although it is actually layered below other application layer protocols, such as HTTP). The successor to SSL, TLS, is even named 'Transport Layer security'.

I could be wrong, but I think viewing USB through the OSI 7-layer model will be a little easier if you change "USB Protocol" to the more precise, USB specification. The USB specifications include multiple protocols spread across multiple layers. The Physical layer includes specifications for things such as connectors, cables, power, and shielding.

2017年11月9日 · the transport layer (layer 4) is used for things like SYN scans, and to detect which ports are open. Sequence number detection, which happens at layer 4 is important to OS detection. Mapping OSI layers 5 and 6 session and the one I can never remember to the TCP/IP protocol stack is complex. I leave that to a long paper I'm not going to write.

In other words, the layer “presents” data for the application or the network. A good example of this is encryption and decryption of data for secure transmission - this happens at Layer 6. Session Layer When two devices, computers or servers need to “speak” with one another, a session needs to be created, and this is done at the Session ...