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514    Chapter 8 • Infrastructure Security: System Hardening



              EXAM WARNING
                  The Security+ exam can ask specific questions about ports and what ser-
                  vices they support. It’s advisable to learn common ports before
                  attempting the exam.
                      21 FTP
                      22 Secure Shell (SSH)
                      23 Telnet
                      25 Simple Mail Transfer Protocol (SMTP)
                      53 DNS
                      80 HTTP
                      110 Post Office Protocol (POP)
                      161 Simple Network Management Protocol (SNMP)
                      443 SSL
                      Memorizing these will help you with the Security+ exam.














































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