What protocols are at the TCP-IP application layer?

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TCP/IP is a Protocol suite not protocol. TCP and IP both are responsible for different functions. TCP handles higher level functions like encapsulation and error detection while IP handles the datagram routing.
The TCP/IP suite includes the following protocols Data Link Layer: ARP/RARP Address Resolution Protocol/Reverse Address DCAP Data Link Switching Client Access Protocol Network Layer: DHCP Dynamic Host Configuration Protocol DVMRP Distance Vector Multicast Routing Protocol ICMP/ICMPv6 Internet Control Message Protocol IGMP Internet Group Management Protocol IP Internet Protocol version 4 IPv6 Internet Protocol version 6 MARS Multicast Address Resolution Server PIM Protocol Independent Multicast-Sparse Mode (PIM-SM) RIP2 Routing Information Protocol RIPng for IPv6 Routing Information Protocol for IPv6 RSVP Resource ReSerVation setup Protocol VRRP Virtual Router Redundancy Protocol Transport Layer: ISTP Mobile IP Mobile IP Protocol RUDP Reliable UDP TALI Transport Adapter Layer Interface TCP Transmission Control Protocol UDP User Datagram Protocol Van Jacobson compressed TCP XOT X.25 over TCP Session Layer: BGMP Border Gateway Multicast Protocol Diameter DIS Distributed Interactive Simulation DNS Domain Name Service ISAKMP/IKE Internet Security Association and Key Management Protocol and Internet Key Exchange Protocol iSCSI Small Computer Systems Interface LDAP Lightweight Directory Access Protocol MZAP Multicast-Scope Zone Announcement Protocol NetBIOS/IP NetBIOS/IP for TCP/IP Environment Application Layer: COPS Common Open Policy Service FANP Flow Attribute Notification Protocol Finger User Information Protocol FTP File Transfer Protocol HTTP Hypertext Transfer Protocol IMAP4 Internet Message Access Protocol rev 4 IMPPpre/IMPPmes Instant Messaging and Presence Protocols IPDC IP Device Control IRC $Internet Relay Chat Protocol ISAKMP Internet Message Access Protocol version 4rev1 ISP NTP Network Time Protocol POP3 Post Office Protocol version 3 Radius Remote Authentication Dial In User Service RLOGIN Remote Login RTSP Real-time Streaming Protocol SCTP Stream Control Transmision Protocol S-HTTP Secure Hypertext Transfer Protocol SLP Service Location Protocol SMTP Simple Mail Transfer Protocol SNMP Simple Network Management Protocol SOCKS Socket Secure (Server) TACACS+ Terminal Access Controller Access Control System TELNET TCP/IP Terminal Emulation Protocol TFTP Trivial File Transfer Protocol WCCP Web Cache Coordination Protocol X-Window X Window Routing: BGP-4 Border Gateway Protocol EGP Exterior Gateway Protocol EIGRP Enhanced Interior Gateway Routing Protocol HSRP Cisco Hot Standby Router Protocol IGRP Interior Gateway Routing NARP NBMA Address Resolution Protocol NHRP Next Hop Resolution Protocol OSPF Open Shortest Path First TRIP Telephony Routing over IP Tunneling: ATMP Ascend Tunnel Management Protocol L2F The Layer 2 Forwarding Protocol L2TP Layer 2 Tunneling Protocol PPTP Point to Point Tunneling Protocol Security: AH Authentication Header ESP Encapsulating Security Payload TLS Transport Layer Security Protocol If you find this info useful, please vote!!!
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List application layer protocols?

1) SMTP- simple mail transfer protocol 2) GMTP- Group mail transfer protocol 3) FTP- File Transfer Protocol 4) TFTP- Trivial File Transfer Protocol 5) User Process

What are the application layer protocol?

It actually depends some on whether you are talking about theTCP/IP model or the OSI model. In general though, application layer protocols include (but are notlimited to): HT