I’m currently looking for a job and I’ve been for a few interviews. I’ve found that some employers are just asking textbook questions like what port number is snmp. This is fine if they are looking for someone who can blurt out computer values but this doesn’t test how good a candidate really is at the job…. well I’ve been asked port numbers so I’ve listed them:

File Transfer Protocol (FTP): TCP port 20 (data) and TCP port 21 (control)
Telnet: TCP port 23
Simple Mail Transfer Protocol (SMTP): TCP port 25
Hypertext Transfer Protocol (HTTP): TCP port 80
Simple Network Management Protocol (SNMP): UDP ports 161 and 162
Domain Name System (DNS): UDP port 53
Trivial File Transfer Protocol (TFTP): UDP port 69
DHCP server: UDP port 67
DHCP client: UDP port 68
Remote Procedure Call (RPC): UDP port 111


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