Section 7 Vocabulary Flashcards
NTP
Network Time Protocol port 123
Slew method
if the time if off by a few seconds then ntp adjust by to get back on track.
slam method
When there is more than a few seconds, ntp hard resets.
NTS
NTP with TLS port 4460
PTP
Precision Time Protocol. Nanosecond precision used for trading.
Grandmaster clock
is the authoritative time source within a PTP domain
Boundary clock
is one with interfaces in multiple PTP segments
Ordinary clock
is one with a single PTP interface
FTP
File transfer Protocol port 21
FTP passive mode
the client opens a data port (again, typically n+1) and sends the PASV command to the server’s control port. The server then opens a random high port number and sends it to the client using the PORT command.
FTP active mode
In active mode, the client sends a PORT command specifying its chosen data connection port number (typically n+1), and the server opens the data connection between the chosen client port and TCP port 20 on the server.
TFTP
FTP with UDP
SFTP
Secure FTP or SSH port 22
FTPES
Explicit TLS, upgrades the connection to secure one. AUTH and PROT are common commands.
FTPS
Implicit TLS. Negotiates a SSL tunnel before the client server exchange
