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APPLICATION LAYER - Coggle Diagram
APPLICATION LAYER
IMAP
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IMAP server listens on port 143, IMAP with SSL secure (IMAPDS) server listen on port 993
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have 3 types: IMAP2, IMAP3, IMAP4
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POP3
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POP server listens on port 110, POP SSL secure (POP3DS) server listens on port 995
have two types : POP2, POP3
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Peer-to-Peer (P2P)
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some application use a hybrid system where each peer accesses an index server to get the location of resource stored on another peer
Examples: (BitTorrent, Direct Connect, Freenet, eDonkey)
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Client Server
involves multiple clients, or workstations, connecting to at least one central server
the device requesting the information (client), the device responding (server)
application layer protocol describe the format of the requests and responses between clients and servers