Ports to Service

Question 1

FTP

Answer 1

*File Transfer Protocol
Transfer files between hosts/systems
TCP over ports 21/22

Question 2

SSH

Answer 2

*Secure Shell CLI to remote devices
TCP over port 22
encrypted
SCP and SFTP utilize SSH

Question 3

Telnet

Answer 3

*Plaintext CLI to remote devices
TCP over port 23
unencrypted, don’t use

Question 4

SMTP

Answer 4

Simple Message Transport Protocol
outgoing email protocol
aka "Send Mail To People"
TCP over port 25
unecrypted

Question 5

TACACS

Answer 5

Terminal Access Controller Access-Control System
TCP/UDP over port 49
Authentication, Authorization and Accounting (AAA) system for network access control
proprietary to CICSO only
encrypted always

Question 6

DNS

Answer 6

*Domain Name Server
used for queries for name to IP resolution
also used for zone transfers - entire lists of DNS records
UDP over port 53

Question 7

TFTP

Answer 7

*Trivial File Transfer
used for small files only, no directory browsing
UDP over port 69

Question 8

HTTP

Answer 8

*Hyper Text Transport Protocol
Web traffic
TCP over port 80
unencrypted

Question 9

Kerberos

Answer 9

Network authentication

TCP/UDP over port 88

Question 10

POP3

Answer 10

Incoming/retrieval of emails
TCP over port 110
unecrypted

Question 11

NTP

Answer 11

Network Time Protocol

UDP over port 123

Question 12

SMB

Answer 12

Server Message Block - NetBIOS

tcp/udp over ports 137-139

Question 13

SNMP

Answer 13

Simple Network Management Protocol

udp over ports 161-162

Question 14

IMAP

Answer 14

Incoming Message A Protocol
Incoming/retrieving emails
TCP over port 143
unecrypted

Question 15

LDAP

Answer 15

Lightweight Directory Access Protocol
tcp/udp over port 389
unencrypted

Question 16

HTTPS

Answer 16

*Hyper Text Transfer Protocol Secure
tcp over port 443
encrypted

Question 17

SMTPS

Answer 17

Secure SMTP
Outgoing emails
tcp over port 587
encrypted with SSL - really TLS

Question 18

LDAPS

Answer 18

Secure LDAP
tcp/udp over port 636
encrypted

Question 19

IMAPS

Answer 19

Secure IMAP
tcp over port 993
encrypted with SSL - really TLS

Question 20

POP3S

Answer 20

Secure POP3
Incoming emails
tcp over port 995
encrypted with SSL really TLS

Question 21

RADIUS

Answer 21

Remote Authentication Dial-in User Service
An AAA server for authentication services
upd over 1812 for Authentication and authorization
upd over 1813 for Accounting messages

Question 22

RDP

Answer 22

Remote Desktop Protocol
tcp over port 3389
encrypted