Ports and Protocols

Question 1

FTP

Answer 1

ports 20,21 - provides insecure file transfers

Question 2

SSH

Answer 2

port 22 - provides secure remote control of another machine using a text-based environment

Question 3

SFTP

Answer 3

port 22 - provides secure file transfers

Question 4

Telnet

Answer 4

port 23 - provides insecure remote control of another machine using a text-based environment

Question 5

SMTP

Answer 5

port 25 - provides the ability to send emails over the network

Question 6

DNS

Answer 6

port 53 - converts domain names to IP addresses, and IP addresses to names

Question 7

DHCP

Answer 7

port 67, 68 - automatically provides network parameters to your clients, such as their assigned IP address, subnet mask, default gateway, and the DNS server they should use

Question 8

TFTP

Answer 8

port 69 - used as a lightweight file transfer method for sending configuration files or network booting of an OS

Question 9

HTTP

Answer 9

port 80 - used for insecure web browsing

Question 10

POP3

Answer 10

port 110 - used for receiving incoming emails

Question 11

NTP

Answer 11

port 123 - used to keep accurate time for clients on a network

Question 12

NetBIOS

Answer 12

port 139 - used for file or printer sharing in a Windows network

Question 13

IMAP

Answer 13

port 143 - a newer method of retrieving incoming emails which improves upon the older POP3

Question 14

SNMP

Answer 14

ports 161, 162 - used to collect data about network devices and monitor their status

Question 15

LDAP

Answer 15

port 389 - used to provide directory services to your network

Question 16

HTTPS

Answer 16

port 443 - used for secure web browsing

Question 17

SMB

Answer 17

port 445 - used for windows file and printer sharing services

Question 18

Syslog

Answer 18

port 514 - used to send logging data back to a centralized server

Question 19

SMTP TLS

Answer 19

port 587 - secure and encrypted way to send emails

Question 20

LDAPS

Answer 20

port 636 - provides secure directory services

Question 21

IMAP over SSL

Answer 21

port 993 - secure and encrypted way to receive emails

Question 22

POP3 over SSL

Answer 22

port 995 - secure and encrypted way to receive emails

Question 23

SQL

Answer 23

port 1433 - used for communication from a client to the database engine

Question 24

SQLnet Protocol

Answer 24

port 1521 - used for communication from a client to an Oracle database

Question 25

MySQL

Answer 25

port 3306 - used for communication from a client to the MySQL database engine

Question 26

RDP

Answer 26

port 3389 - provides graphical remote control of another client or server

Question 27

Session Initiation Protocol (SIP)

Answer 27

ports 5060, 5061 - used to initiate VoIP and video calls

Question 28

TCP

Answer 28

conducts a three-way handshake between a client and a server, and then establishes the connection

Question 29

UDP

Answer 29

detects if packets are corrupted when they are received by a client using a checksum

Question 30

ICMP

Answer 30

used to communicate information about network connectivity issues back to the sender

Question 31

Generic Routing Encapsulation (GRE) Protocol

Answer 31

used as a simple and effective way to create a tunnel, called a GRE tunnel, over a public network

Question 32

Internet Protocol Security (IPSec)

Answer 32

used to protect one or more data flows between peers. uses AH and ESP.

Question 33

Authentication Header (AH)

Answer 33

a protocol within IPSec that provides integrity and authentication.

Question 34

Encapsulating Security Payload (ESP)

Answer 34

provides encryption and integrity for the data packets sent over IPsec