What is UDP 33434 used for?
What is UDP 33434 used for?
Cisco’s implementation of traceroute also uses a sequence of UDP datagrams, each with incrementing TTL values, to an invalid port number at the remote host; by default, UDP port 33434 is used.
What are 5 common protocols that use TCP and UDP?
Following are some of the common TCP and UDP default ports.
- SMTP – 25. SMTP is known as the Simple Mail Transfer Protocol.
- HTTP – 80. Port 80 is associated with HTTP, Hypertext Transfer Protocol.
- HTTPS – 443. HTTPS – 443 is also associated with the TCP protocol.
- FTP – 20, 21.
- TELNET – 23.
- IMAP – 143.
- RDP – 3389.
- SSH – 22.
What ports are bad?
“Bad” TCP/UDP Ports List
| 31/tcp | Agent 31, Hackers Paradise, Masters Paradise |
|---|---|
| 31337/tcp | Back Orifice, Baron Night, Bo Facil |
| 33270/tcp | Trinity master-to-daemon |
| 33567/tcp | Backdoor rootshell via inetd (from Lion worm) |
| 33568/tcp | Trojaned version of SSH (from Lion worm) |
What are UDP ports 137 and 138?
Ports 137, 138, and 139 are used by NetBIOS, which does not support IPv6. CIFS is required for Windows file service. You can disable CIFS by issuing the cifs terminate command on your storage system console.
What is NetBIOS 137?
Port 137 is utilized by NetBIOS Name service. Enabling NetBIOS services provide access to shared resources like files and printers not only to your network computers but also to anyone across the internet. Therefore it is advisable to block port 137 in the Firewall.
What is User Datagram Protocol (UDP)?
User Datagram Protocol (UDP) is a Transport Layer protocol. UDP is a part of Internet Protocol suite, referred as UDP/IP suite. Unlike TCP, it is unreliable and connectionless protocol.
What is the 16-bit one’s complement of UDP header?
It is the 16-bit one’s complement of the one’s complement sum of the UDP header, pseudo header of information from the IP header and the data, padded with zero octets at the end (if necessary) to make a multiple of two octets. Notes – Unlike TCP, Checksum calculation is not mandatory in UDP.
What is the length of UDP header and data field?
Length : Length is the length of UDP including header and the data. It is 16-bits field. Checksum : Checksum is 2 Bytes long field.
What is the range for port numbers defined in UDP?
UDP port number fields are each 16 bits long, therefore range for port numbers defined from 0 to 65535; port number 0 is reserved. Port numbers help to distinguish different user requests or process.