The answer is DNS is mostly UDP Port 53, but as time progresses, DNS will rely on TCP Port 53 more heavily. DNS has always been designed to use both UDP and TCP port 53 from the start 1, with UDP being the default, and fall back to using TCP when it is unable to communicate on UDP, typically when the packet size is too large to push through in a single UDP packet.

Jul 03, 2017 · TCP provides apps a way to deliver (and receive) an ordered and error-checked stream of information packets over the network. The User Datagram Protocol (UDP) is used by apps to deliver a faster stream of information by doing away with error-checking. When configuring some network hardware or software, you may need to know the difference. Jul 16, 2020 · Service Name and Transport Protocol Port Number Registry Last Updated 2020-07-16 Expert(s) TCP/UDP: Joe Touch; Eliot Lear, Allison Mankin, Markku Kojo, Kumiko Ono, Martin Stiemerling, Lars Eggert, Alexey Melnikov, Wes Eddy, Alexander Zimmermann, Brian Trammell, and Jana Iyengar SCTP: Allison Mankin and Michael Tuexen DCCP: Eddie Kohler and Yoshifumi Nishida I like to equate ports to a person in a house. You go to a house at an address (IP address) and then ask for Bob (port). Bob listens for your knock at the door and when he opens it, you can communicate with him. This article goes over the options a Citrix Administrator needs to know if they want to recreate the ICA-TCP port in XenApp 6.x. To show Citrix Administrators how to recreate the XenApp ICA-TCP port in XenApp 6.x on Windows 2008 R2 servers. UDP : For the vCenter Server appliance, this port is designated for Active Directory authentication. 161 : UDP : SNMP Server. 636 : TCP : vCenter Single Sign-On LDAPS (6.0 and later) 8084, 9084, 9087 : TCP : Used by vSphere Lifecycle Manager. 8109 : TCP : VMware Syslog Collector. This service is needed if you want to centralize log collection ICMP (ping, trace)is a layer 3 protocol suite within the TCP/IP suite, doesnt test any layer 4 or above functions, therefore, it has no TCP/UDP layer 4 port number. The sub protocols within it do. You can block echo replies by closing port 7. That is how you get to be not pinged on the net. Self-Certifying File System(SFS) sfssd acceps connections on TCP port 4 and passes them to the appropriate SFS daemon. SFS is a secure, global file system with completely decentralized control. SFS uses NFS 3 as the underlying protocol for file access. America's Army also uses this port. Midnight Commander sometimes uses port 4/tcp as well. SG

TCP port used to connecting StoreFront and SQL server to read/write application information to the subscription database. You can use SQL database as an alternative to the built-in ESE+Mesh from StoreFront 3.0.1 onwards.

Jul 03, 2017 · TCP provides apps a way to deliver (and receive) an ordered and error-checked stream of information packets over the network. The User Datagram Protocol (UDP) is used by apps to deliver a faster stream of information by doing away with error-checking. When configuring some network hardware or software, you may need to know the difference. Jul 16, 2020 · Service Name and Transport Protocol Port Number Registry Last Updated 2020-07-16 Expert(s) TCP/UDP: Joe Touch; Eliot Lear, Allison Mankin, Markku Kojo, Kumiko Ono, Martin Stiemerling, Lars Eggert, Alexey Melnikov, Wes Eddy, Alexander Zimmermann, Brian Trammell, and Jana Iyengar SCTP: Allison Mankin and Michael Tuexen DCCP: Eddie Kohler and Yoshifumi Nishida I like to equate ports to a person in a house. You go to a house at an address (IP address) and then ask for Bob (port). Bob listens for your knock at the door and when he opens it, you can communicate with him. This article goes over the options a Citrix Administrator needs to know if they want to recreate the ICA-TCP port in XenApp 6.x. To show Citrix Administrators how to recreate the XenApp ICA-TCP port in XenApp 6.x on Windows 2008 R2 servers.

If it uses the UDP protocol to send and receive data, it will use a UDP port. Figure 1, below, is a represenation of an IP address split into its many TCP and UDP ports.

Desktop Data UDP 3: NESS application. 8892 : Desktop Data TCP 4: FARM product. Desktop Data UDP 4: FARM product. 8893 : Desktop Data TCP 5: NewsEDGE/Web application. Desktop Data UDP 5: NewsEDGE/Web application. 8894 : Desktop Data TCP 6: COAL application. Desktop Data UDP 6: COAL application. 8895-8898 : 8899 : ospf-lite.