Of course you could make a separate protocol object-group to combine both tcp and udp into one (I do this at work), for example. object-group protocol TCP-UDP. protocol-object udp. protocol-object tcp. This would make above ACL like this: access-list 100 permit object-group tcp-udp any host 18.104.22.168 object-group ntp. HTH. Regards. Farrukh
An application can use UDP and can be reliable by using a timeout and resend at the application layer. Actually, DNS primarily uses the User Datagram Protocol (UDP) on port number 53 to serve requests. DNS queries consist of a single UDP request from the client followed by a single UDP reply from the server. TFTP is a great example of a protocol that was specifically designed for UDP, especially when it is compared to regular FTP. The latter protocol uses TCP to establish a session between two devices, and then makes use of its own large command set and TCP's features to ensure reliable transfer of possibly very large files. However, because the UDP protocol is a connectionless protocol, UDP datagrams sent to the remote endpoint are not guaranteed to arrive, nor are they guaranteed to arrive in the same sequence in which they are sent. Applications that use UDP must be prepared to handle missing, duplicate, and out-of-sequence datagrams. Oct 16, 2019 · 23, tcp, udp, telnet protocol unencrypted text communications, official in tcp ip and udp networks, a port is an endpoint to a logical connection and the way a client program specifies a specific server program on a computer in a network. The User Datagram Protocol, or UDP for short, is a protocol that allows datagrams to be sent without connection in IP-based networks. To achieve the desired services on the target hosts, it uses ports that are listed as one of the core components in the UDP header.
UDP (User Datagram Protocol) is a communications protocol that is primarily used for establishing low-latency and loss-tolerating connections between applications on the internet. It speeds up transmissions by enabling the transfer of data before an agreement is provided by the receiving party.
The IANA assignment for UDP is historical; at the time, nearly every protocol was assigned both the TCP and UDP port numbers, even if it was expected that it would only ever use one. There has been discussion of merging the port number registries, and only ever assigning one port to one protocol from here on. One other important protocol in the TCP/IP site is User Datagram Protocol (UDP).This protocol is basically a scaled-down version of TCP. Just like TCP, this protocol provides delivery of data between applications running on hosts on a TCP/IP network, but it does not sequence the data and does not care about the order in which the segments arrive at the destination. That is why we decided to tweak the network to see if the end-user experience would be affected with UDP or with TCP protocol. Second experiment: UDP vs TCP on 15% packet loss network Here we can see the results of the voice quality in a network with 15% of packet loss injected. UDP scan works by sending a UDP packet to every targeted port. For most ports, this packet will be empty (no payload), but for a few of the more common ports a protocol-specific payload will be sent. Based on the response, or lack thereof, the port is assigned to one of four states, as shown in Table 5.3.
UDP Protocol- UDP is short for User Datagram Protocol.; It is the simplest transport layer protocol. It has been designed to send data packets over the Internet. It simply takes the datagram from the network layer, attaches its header and sends it to the user.
What is User Datagram Protocol (UDP/IP)? UDP is a communication protocol used across the Internet for especially time-sensitive transmissions such as video playback or DNS lookups. It speeds up communications by not requiring what’s known as a “handshake”, allowing data to be transferred before the receiving party agrees to the communication. Why does DNS use UDP and not TCP? - GeeksforGeeks Jul 11, 2015 User Datagram Protocol, UDP, UDP Header, UDP Header Fields