Cisco Certified Support Technician (CCST) NetworkingIP ServicesMedium
A network technician is configuring a new router and wants to ensure that all generated log messages are sent to a remote Syslog server for centralized storage and analysis. Which UDP port must be opened on the Syslog server's firewall to receive these messages by default?
- A514
- B123
- C53
- D23
Show answer & explanationAnswer & explanation
Correct answer: A. 514
Syslog uses UDP port 514 as its default port for sending and receiving log messages. To allow a remote Syslog server to receive logs, this port must be open on its firewall.
Why the other options are wrong
- B. Port 123 is used by NTP (Network Time Protocol).
- C. Port 53 is used by DNS (Domain Name System).
- D. Port 23 is used by Telnet, a remote access protocol.
Syslog Default Port
The standard UDP port number that Syslog uses for transmitting log messages over a network.
- UDP Port 514 is the default.
- Must be open on Syslog server firewall.
- TCP can also be used, often on port 6514, but UDP 514 is most common.
Memory trick: 514 is the Syslog door, UDP's log-store.