CREST CPSA STUDY GUIDE 2026 COMPREHENSIVE QUESTIONS AND ANSWERS

CREST CPSA STUDY GUIDE 2026
COMPREHENSIVE QUESTIONS AND
ANSWERS


◉22 TCP. Answer: SSH / SCP (Secure Shell / Copy)


◉23 TCP. Answer: Telnet (plaintext remote login)


◉ TCP. Answer: SMTP (mail transfer / submission)


◉49 TCP. Answer: TACACS (Authentication)


◉53 TCP/UDP. Answer: DNS (queries UDP / zone transfer TCP)


◉67. Answer: 68 UDP - DHCP (server ↔ client)


◉69 UDP. Answer: TFTP (Trivial FTP)


◉80 TCP. Answer: HTTP (web)

,◉88 TCP/UDP. Answer: Kerberos (auth tickets)


◉110 TCP. Answer: POP3 (mail retrieval)


◉ TCP/UDP. Answer: NFS (Network File System /
RPCbind)


◉119 TCP. Answer: NNTP (Network News Transfer Protocol)


◉123 UDP. Answer: NTP (Network Time Protocol)


◉135 TCP/UDP. Answer: MS RPC (Remote Procedure Call)


◉137. Answer: 139 TCP/UDP - NetBIOS (name service / datagram /
session)


◉143 TCP. Answer: IMAP4 (mail retrieval)


◉161. Answer: 162 UDP - SNMP (get / trap)


◉389 TCP/UDP. Answer: LDAP (directory services)

, ◉443 TCP. Answer: HTTPS (secure web traffic)


◉445 TCP. Answer: Microsoft DS / SMB (file sharing)


◉465 TCP. Answer: SMTPS (secure SMTP)


◉500 UDP. Answer: ISAKMP (IPSec key exchange)


◉512. Answer: Rexec


◉513. Answer: rlogin


◉563 TCP. Answer: NNTPS (NNTP over SSL)


◉636 TCP. Answer: LDAPS (secure LDAP)


◉873 TCP. Answer: rsync (file sync)


◉989. Answer: 990 TCP - FTPS (FTP over SSL)


◉993 TCP. Answer: IMAPS (secure IMAP4)