Application layer Totally Explained

Everything about The Application Layer totally explained

The application layer is the seventh level of the seven-layer OSI model, and the fifth layer of the five-layer TCP/IP model. It interfaces directly to and performs common application services for the application processes; it also issues requests to the presentation layer.
The common application layer services provide semantic conversion between associated application processes. Note: Examples of common application services of general interest include the virtual file, virtual terminal, and job transfer and manipulation protocols.
The application layer of the four-layer and five-layer TCP/IP models corresponds to the application layer, the presentation layer and session layer in the seven layer OSI model.

Examples

9P, Plan 9 from Bell Labs distributed file system protocol
AFP, Apple Filing Protocol
APPC, Advanced Program-to-Program Communication
AMQP, Advanced Message Queuing Protocol
Basenet
BitTorrent
Atom Publishing Protocol
BOOTP, Bootstrap Protocol
CFDP, Coherent File Distribution Protocol
DDS, Data Distribution Service
DHCP, Dynamic Host Configuration Protocol
DeviceNet
DNS, Domain Name System (Service) Protocol
eDonkey
ENRP, Endpoint Handlespace Redundancy Protocol
FastTrack (KaZaa, Grokster, iMesh)
Finger, User Information Protocol
Freenet
FTAM, File Transfer Access and Management
FTP, File Transfer Protocol
Gopher, Gopher protocol
HL7, Health Level Seven
HTTP, HyperText Transfer Protocol
H.323, Packet-Based Multimedia Communications System
IMAP, IMAP4, Internet Message Access Protocol (version 4)
IRCP, Internet Relay Chat Protocol
Kademlia
LDAP, Lightweight Directory Access Protocol
LPD, Line Printer Daemon Protocol
MIME (S-MIME), Multipurpose Internet Mail Extensions and Secure MIME
Modbus
Netconf
NFS, Network File System
NIS, Network Information Service
NNTP, Network News Transfer Protocol
NTCIP, National Transportation Communications for Intelligent Transportation System Protocol
NTP, Network Time Protocol
OSCAR, AOL Instant Messenger Protocol
PNRP, Peer Name Resolution Protocol
POP, POP3, Post Office Protocol (version 3)
Rlogin, Remote Login in UNIX Systems
RTPS, Real Time Publish Subscribe
RTSP, Real Time Streaming Protocol
SAP, Session Announcement Protocol
SDP, Session Description Protocol
SIP, Session Initiation Protocol
SLP, Service Location Protocol
SMB, Server Message Block
SMTP, Simple Mail Transfer Protocol
SNMP Simple Network Management Protocol
SNTP, Simple Network Time Protocol
RDP, Remote Desktop Protocol
SSH, Secure Shell
TCAP, Transaction Capabilities Application Part
TDS, Tabular Data Stream
TELNET, Terminal Emulation Protocol of TCP/IP
TFTP, Trivial File Transfer Protocol
TSP, Time Stamp Protocol
VTP, Virtual Terminal Protocol
Waka (protocol), an HTTP replacement protocol
Whois (and RWhois), Remote Directory Access Protocol
WebDAV
X.400, Message Handling Service Protocol
X.500, Directory Access Protocol (DAP)
XMPP, Extensible Messaging and Presence Protocol

Further Information

Get more info on 'Application Layer'.

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