Most of the application layer protocols are layered on top of either TCP or UDP. Therefore, TCP and UDP have to concurrently handle the many disparate data streams sent to them from the application layer. The demultiplexing process would be hopelessly complicated and impossible to handle without some means of identifying which data stream a particular segment of data belongs to. Both TCP and UDP provide a port identifier to uniquely identify each data stream. A set of standard port numbers are assigned by the IANA to the major aplication layer protocols. These 'well known' ports make it easier to find the corresponding server for a particular protocol on a host. e.g. SMTP servers can usually be found on port 25 and HTTP servers are usually on port 80. The combination of a TCP/UDP port and an IP address uniquely identifies a particular service on a particular host. The term 'socket' is usually used to refer to the combination of the TCP/UDP port and IP address.
**The TCP transport layer protocol uses windowing and acknowledgments for reliable transfer of data. **The TCP and UDP port numbers are used by application layer protocols. **The TCP transport layer protocol provides services to direct the data packets to their destination hosts.
TELNET operates at Application Layer in TCP/IP Model. It's an Application to establish a connection to TCP Port Number 23, where a Telnet server application (telnetd) is listening.
TCP and UDP are transport layer protocols; the OSI layer is layer 4 (transport)
Normally both using transport layer for communication but they are using tcp protocol which uses application layer so application layer is correct answer..
tcp
**The TCP transport layer protocol uses windowing and acknowledgments for reliable transfer of data. **The TCP and UDP port numbers are used by application layer protocols. **The TCP transport layer protocol provides services to direct the data packets to their destination hosts.
Application Layer
The Application layer The Presentation layer The Session layer
TELNET operates at Application Layer in TCP/IP Model. It's an Application to establish a connection to TCP Port Number 23, where a Telnet server application (telnetd) is listening.
2^16 bytes - size of TCP header
Megaco/H.248 is an Application Layer protocol and works on TCP/UDP.
internetwork
TCP and UDP are transport layer protocols; the OSI layer is layer 4 (transport)
Normally both using transport layer for communication but they are using tcp protocol which uses application layer so application layer is correct answer..
Application layer
DNS is an application layer protocol. The application layer of the OSI model is the layer closest to the user and provides network services to the applications of the user. Examples of protocols that operate at the application layer are: DNS, FTP, TFTP, SNMP, TELNET, RLOGIN, SMTP, MIME, NFS, FINGER, BOOTP and SMB.
The TCP/IP model was adopted and condensed into 4 Layers.1. Link layer ( Layer 1and 2 of the OSI model)2. Internet Layer (Layer 3 of the OSI model)3. Transport ( Layer 4, 5 and 6 of the OSI model)4. Application ( Layer 7 of the OSI model)http://en.wikipedia.org/wiki/TCP/IP_model#Link_Layer