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Application Layer - Coggle Diagram
Application Layer
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HTTP and HTTPS
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Three common message types are GET, POST, and PUT
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DNS Message Format
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Contain the name, address, and type of record
Record types are:
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CNAME - the canonical name for an alias; used when multiple services have the single network address but each service has its own entry in DNS
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Unable to resolve the name using its stored records, contacts other servers
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Application, Session and Presentation
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Session Layer
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Handles the exchange of information to initiate dialogs, keep them active, and to restart sessions
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Common P2P Applications
With P2P applications, each computer in the network running the application can act as a client or a server for the other computers in the network running the application
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Some P2P applications are based on the Gnutella protocol which enables people to share files on their hard disks with others
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SMTP, POP, and IMAP (Continued)
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File Transfer Protocol
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FTP client is an application that runs on a computer that is used to push and pull data from a server running an FTP daemon
To successfully transfer data, FTP requires two connections between the client and the server, one for commands and replies, the other for the actual file transfer
nslookup
Operating system utility called nslookup allows the user to manually query the name servers to resolve a given host name
Utility can be used to troubleshoot name resolution issues and to verify the current status of the name servers
Server Message Block
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After the connection is established, the user can access the resources on the server as if the resource is local to the client host