Let us consider two hosts(computers), host A and host B. The two hosts use a common protocol to communicate with each other on the same layer. The protocol which is defined by each host(layer on each host) , uses a header that is transmitted between the host A and host B for mutual communication. This mode of communication is referred as Same-layer interaction on different computers.
In TCP/IP protocol architecture, the low-level layer provides a service to a high-level layer. For example, transport layer provides service to application layer, i.e. TCP(transport layer protocol) provides service to HTTP(application layer protocol). This is the best example to understand that when HTTP requests for a web page, TCP does it. This mode of communication is often referred as Adjacent-layer interaction on the same computer.
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