Cisco CCNA exam Cram Sheet
Cisco CCNA exam Cram Sheet General Networking Port Numbers Port Number Layer 4 Protocol Suite Application 20 TCP FTP Data 21 TCP FTP Program 23 TCP Telnet 25 TCP SMTP 53 TCP/UDP DNS 69 UDP TFTP 80 TCP HTTP Ping Responses ! – Reply from target address . – Timeout U – Destination unreachable C […]