Feb 18, 2018 · By the end of this course, you’ll be able to: - describe computer networks in terms of a five-layer model. - understand all of the standard protocols involved with TCP/IP communications. - grasp
May 22, 2019 networking - When do DNS queries use TCP instead of UDP The maximum size was originally 512 bytes but there is an extension to the DNS protocol that allows clients to indicate that they can handle UDP responses of up to 4096 bytes. DNSSEC responses are usually larger than the maximum UDP size. Transfer requests are usually larger than the maximum UDP size and hence will also be done over TCP. Allow Both TCP and UDP Port 53 to Your DNS Servers TCP port 53 can be used in the cases where the DNS responses greater than 512 bytes. However, using UDP messages are preferable to using TCP for large DNS messages is due to the fact that TCP
Aug 19, 2016 · The Transmission Control Protocol (TCP) is used when the response data size exceeds 512 bytes, or for tasks such as zone transfers. Some resolver implementations use TCP for all queries. I suggest you trust NSLookup and other applications to be smart enough to know how they should behave.
Pourquoi DNS utilise-t-il UDP au lieu de TCP? [Résolu DNS n'est pas un protocole de transmision et DNS n'utilise pas UDP ou TCP. DNS permet a des protocoles UDP ou TCP d'utiliser DNS ou si tu prefere UDP ou TCP passent au travers d'une DNS qui n'est autre qu'une resolution de nom de domaine et non pas une couche de transmission de protocole. Du reste des paquets de type ARP par exemples sont Preparing for DNSSEC: Best Practices, Recommendations, and DNS can use either the User Datagram Protocol (UDP) or Transmission Control Protocol (TCP); historically, it uses a destination port of 53. When the DNS protocol uses UDP as the transport, it has the ability to deal with UDP retransmission and sequencing.
DNS can use either the User Datagram Protocol (UDP) or Transmission Control Protocol (TCP) and historically uses a destination port of 53. When the DNS protocol uses UDP as the transport, it has the ability to deal with UDP retransmission and sequencing.
Check UDP connection to any port of any IP or website from different places. For example you could check a DNS or game server for availability from many countries. Examples: 8.8.8.8:53. domain://8.8.4.4. cw.live-cs.ru:27997