DHCP is a connectionless protocols. In general, any protocol that is based on TCP port alone is a connection-oriented protocol while any protocol that is based on UDP port alone is a connectionless protocol. And a protocols that can work on both TCP and UDP port can be either a connection-oriented or a connectionless protocol depending upon the which protocol is used (TCP or UDP). For checking other protocols if they are connection-oriented or connectionless check http://en.wikipedia.org/wiki/List_of_TCP_and_UDP_port_numbers
The communication between two brains is connectionless. - Syam
They can be both. E.g. MPLS-TP or Connection-Oriented-Ethernet (COE) are connection oriented.
Different from a connectionless protocol, a connection-oriented protocol guaranties the delivery of the information. An example of connection-oriented protocol is (TCP) and a connectionless protocol is (UDP). TCP is a connection-oriented protocol, it makes a connection and checks whether the data is received, and resends if it is not. UDP is a connectionless protocol, it does not guarantee delivery by first connecting and checking whether data is received.
If FTP did not have TCP working with it, it could be considered connectionless. TCP is connection oriented and it verifies the FTP transfers have been received. Therefore it is considered Connection Oriented. If FTP used UDP it would be considered connectionless as UDP just sends the data and never checks to see if it all made it to the recipient -
Different from a connectionless protocol, a connection-oriented protocol guaranties the delivery of the information. An example of connection-oriented protocol is (TCP) and a connectionless protocol is (UDP). page/926 A+
I would say it is connectionless, as it sends the message to the person to revive it without establishing the connection first so there's no way to know if they revived it.
flow control low overhead connectionless connection-oriented sequence and acknowledgements
ACK
an upper-layer, connection-oriented protocol or service
First let me explain the difference between connection oriented and connectioinless oriented. We'll use you as an example, Lets say you want to send an email to your friend in Australia. You need a system called a protocol to set up your system before you send the message. First a connection has to be made with your buddies Internet supplier, then once the connection is made you can send your email, then you want to make sure he got your email and then you want to end the session so someone else can use the system. On a connection protocol, the protocol first establishes a connection, then waits for a signal from the receiver to make sure the system is clear, then the data is sent, then it waits for a signal to say the data was received, then the session is closed. On a connectionless protocol, the session is established, the data is sent, and then the session is closed. So there is no confirmation if the data was received. That is what connectionless means, Netware uses a Transport protocol called IPX which is a connectionless protocol. So that is where the name came from.
TCP has an acknowledgement technique of checking if data packet is received either at the client or at the server end, this is what makes it a connection oriented network service.whileUDP does not guarantee reliability of ordering or acknowledgement the way TCP does. Datagrams may appear out of order, missing or appear duplicated. This is what makes it a connectionless oriented network service.