OSI Model Layers
Layer 6 of The OSI Model: Presentation Layer is the layer of the ISO Open Systems Interconnection (OSI) model that establishes context between application-layer entities, in which the higher-layer entities may use different syntax and semantics if the presentation service provides a mapping between them.
Layer 5 of the OSI Model: Session Layer is the layer of the ISO Open Systems Interconnection (OSI) model that controls the dialogues (connections) between computers. The session layer is commonly implemented explicitly in application environments that use remote procedure calls.
Router and Protocols
Router: For Different Networks & Protocols A router can forward traffic (packets) based on layer 3 information using IP address. Working to route the packets to their destination, a router analyzes the layer 3 destination address of every packet, and decides the best next hop for it.
Layer and Protocol
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What layer is FTP? Application layer FTP is an application layer protocol that is used for transferring both text and binary files over the Internet.
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What is a layer 3 address? Logical address The layer 3 address is a logical address. It will pertain to a single protocol (such as IP, IPX, or Appletalk). The layer 2 address is a physical address. It pertains to the actual hardware interface (NIC) in the computer.
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What layer is DNS? Layer 7 We know what DNS is, but what about the DNS layer? At a high level, the DNS protocol operates (using OSI model terminology) at the application level, also known as Layer 7. This layer is shared by HTTP, POP3, SMTP, and a host of other protocols used to communicate across an IP network.
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What layer is SMTP? Application layer As with the other protocols and services discussed in this section, SMTP operates at the Application layer and relies on the services of the underlying layers of the TCP/IP suite to provide the actual data transfer services.
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What layer is ICMP protocol? Layer 3 protocol Therefore, in the topic on TCP/IP-based layered network, ICMP is shown as a layer 3 protocol. ICMP is probably most well known as the message protocol used for the ping command. A ping command sends an ICMP echo request to the target host.