CREST CPSA QUESTIONS AND ANSWERS 2025
TCP - (ANSWER)Transmission Control Protocol
UDP - (ANSWER)User Datagram Protocol
Port 21 - (ANSWER)FTP
FTP - (ANSWER)File Transfer Protocol
Port 22 - (ANSWER)SSH
SSH - (ANSWER)Secure Shell
Port 23 - (ANSWER)Telnet
Port 25 - (ANSWER)SMTP
SMTP - (ANSWER)Simple Mail Transfer Protocol
Port 49 - (ANSWER)TACACS
TACACS - (ANSWER)Terminal Access Controller Access Control System
Port 53 - (ANSWER)DNS
DNS - (ANSWER)Domain Name System
Port 67 (UDP) - (ANSWER)DHCP (Server)
,CREST CPSA QUESTIONS AND ANSWERS 2025
Port 68 (UDP) - (ANSWER)DHCP (Client)
DHCP - (ANSWER)Dynamic Host Configuration Protocol
Port 69 (UDP) - (ANSWER)TFTP
TFTP - (ANSWER)Trivial File Transfer Protocol
Port 80 - (ANSWER)HTTP
HTTP - (ANSWER)Hypertext Transfer Protocol
Port 88 - (ANSWER)Kerberos
Kerberos - (ANSWER)A computer network authentication protocol that works on the basis of tickets to
allow nodes communicating over a non-secure network to prove their identity to one another in a
secure manner
Port 110 - (ANSWER)POP3
POP3 - (ANSWER)Post Office Protocol version 3
Port 111 - (ANSWER)RPC
RPC - (ANSWER)Remote Procedure Call
Port 123 - (ANSWER)NTP
,CREST CPSA QUESTIONS AND ANSWERS 2025
NTP - (ANSWER)Network Time Protocol
Port 135 - (ANSWER)Windows RPC (EPM)
Port 593 - (ANSWER)RPC over HTTPS
Port 445 - (ANSWER)SMB
SMB - (ANSWER)Server Message Block
Port 137 (UDP) - (ANSWER)NetBIOS (name services)
Port 138 (UDP) - (ANSWER)NetBIOS (datagram services)
Port 139 - (ANSWER)NetBIOS (session services)
NetBIOS - (ANSWER)Network Basic Input/Output System
Port 143 - (ANSWER)IMAP
IMAP - (ANSWER)Internet Message Access Protocol
Port 161 (UDP) - (ANSWER)SNMP
SNMP - (ANSWER)Simple Network Management Protocol
, CREST CPSA QUESTIONS AND ANSWERS 2025
Port 179 - (ANSWER)BGP
BGP - (ANSWER)Border Gateway Protocol
Border Gateway Protocol (BGP) - (ANSWER)A standardized exterior gateway protocol designed to
exchange routing and reach-ability information among autonomous systems on the Internet. The
protocol is classified as a path vector protocol.
Port 201 - (ANSWER)AppleTalk
Port 389 - (ANSWER)LDAP
LDAP - (ANSWER)Lightweight Directory Access Protocol
Port 443 - (ANSWER)HTTPS
Port 500 (UDP) - (ANSWER)Internet Key Exchange (IKE) (used with IPSec)
ISAKMP
ISAKMP - (ANSWER)Internet Security Association and Key Management Protocol
Port 514 (UDP) - (ANSWER)Syslog
Port 520 - (ANSWER)RIP
RIP - (ANSWER)Routing Information Protocol
TCP - (ANSWER)Transmission Control Protocol
UDP - (ANSWER)User Datagram Protocol
Port 21 - (ANSWER)FTP
FTP - (ANSWER)File Transfer Protocol
Port 22 - (ANSWER)SSH
SSH - (ANSWER)Secure Shell
Port 23 - (ANSWER)Telnet
Port 25 - (ANSWER)SMTP
SMTP - (ANSWER)Simple Mail Transfer Protocol
Port 49 - (ANSWER)TACACS
TACACS - (ANSWER)Terminal Access Controller Access Control System
Port 53 - (ANSWER)DNS
DNS - (ANSWER)Domain Name System
Port 67 (UDP) - (ANSWER)DHCP (Server)
,CREST CPSA QUESTIONS AND ANSWERS 2025
Port 68 (UDP) - (ANSWER)DHCP (Client)
DHCP - (ANSWER)Dynamic Host Configuration Protocol
Port 69 (UDP) - (ANSWER)TFTP
TFTP - (ANSWER)Trivial File Transfer Protocol
Port 80 - (ANSWER)HTTP
HTTP - (ANSWER)Hypertext Transfer Protocol
Port 88 - (ANSWER)Kerberos
Kerberos - (ANSWER)A computer network authentication protocol that works on the basis of tickets to
allow nodes communicating over a non-secure network to prove their identity to one another in a
secure manner
Port 110 - (ANSWER)POP3
POP3 - (ANSWER)Post Office Protocol version 3
Port 111 - (ANSWER)RPC
RPC - (ANSWER)Remote Procedure Call
Port 123 - (ANSWER)NTP
,CREST CPSA QUESTIONS AND ANSWERS 2025
NTP - (ANSWER)Network Time Protocol
Port 135 - (ANSWER)Windows RPC (EPM)
Port 593 - (ANSWER)RPC over HTTPS
Port 445 - (ANSWER)SMB
SMB - (ANSWER)Server Message Block
Port 137 (UDP) - (ANSWER)NetBIOS (name services)
Port 138 (UDP) - (ANSWER)NetBIOS (datagram services)
Port 139 - (ANSWER)NetBIOS (session services)
NetBIOS - (ANSWER)Network Basic Input/Output System
Port 143 - (ANSWER)IMAP
IMAP - (ANSWER)Internet Message Access Protocol
Port 161 (UDP) - (ANSWER)SNMP
SNMP - (ANSWER)Simple Network Management Protocol
, CREST CPSA QUESTIONS AND ANSWERS 2025
Port 179 - (ANSWER)BGP
BGP - (ANSWER)Border Gateway Protocol
Border Gateway Protocol (BGP) - (ANSWER)A standardized exterior gateway protocol designed to
exchange routing and reach-ability information among autonomous systems on the Internet. The
protocol is classified as a path vector protocol.
Port 201 - (ANSWER)AppleTalk
Port 389 - (ANSWER)LDAP
LDAP - (ANSWER)Lightweight Directory Access Protocol
Port 443 - (ANSWER)HTTPS
Port 500 (UDP) - (ANSWER)Internet Key Exchange (IKE) (used with IPSec)
ISAKMP
ISAKMP - (ANSWER)Internet Security Association and Key Management Protocol
Port 514 (UDP) - (ANSWER)Syslog
Port 520 - (ANSWER)RIP
RIP - (ANSWER)Routing Information Protocol
