Port numbers

Question 1

List the protocol (tcp or udp) and the port number

-Automatically assign an IP address (two ports)

Answer 1

Dynamic host configuration protocol

• provides automatic address/IP configuration for almost all devices
• DHCP UDP/67 and UDP/68

Question 2

List the protocol (tcp or udp) and the port number

- Retrieve an email to a mobile phone using POP3

Answer 2

TCP/110 POP3

Question 3

List the protocol (tcp or udp) and the port number

- Resolve the IP address of www.professormesser.com

Answer 3

UDP/53 DNS (domain name system)

converts names to IP addresses

Question 4

List the protocol (tcp or udp) and the port number:

- Manage the console of a remote device (insecurely)

Answer 4

Telnet TCP/23

Question 5

List the protocol (tcp or udp) and the port number:

-Control the mouse on a remote Windows computer

Answer 5

TCP/3389 (RDP)

Question 6

FTP

Answer 6

File Transfer protocol
tcp/20 (active mode data)
tcp/21 (control)
authenticates with a username and password 
Transfers files between systems
list, add, delete

Question 7

SSH

Answer 7

Secure Shell
encrypted console communication tcp/22
Looks and acts the same as Telnet tcp/23

Question 8

Telnet

Answer 8

Log in remotely (Not secure)

tcp/23

Question 9

SMTP

Answer 9

SMTP (Simple mail transfer protocol)

• Used for transferring mail from a client to an email server; also used to transfer email between servers.
• TCP and UDP 25

Question 10

DNS

Answer 10

DNS (Domain name system)

TCP and UDP 53

Question 11

HTTP

Answer 11

HTTP (Hypertext transfer protocol)
Application layer protocol in the internet protocol suite model for distributed systems.
tcp/80

Question 12

POP3

Answer 12

POP3 (post office protocol 3)
basic mail transfer functionality
TCP/110

Question 13

IMAP

Answer 13

IMAP (Internet message access protocol v4)

• Includes management of email inbox from multiple clients
• TCP/143

Question 14

HTTPS

Answer 14

Hypertext transfer protocol secure
Web server communication with encryption
tcp/443

Question 15

RDP

Answer 15

Remote desktop protocol
Share desktop remotely
tcp/3389

Question 16

NetBIOS/NetBT

Answer 16

Network basic input/output system

tcp and udp 137-139

Question 17

SMB/CIFS

Answer 17

Server message block/common internet file system
file and printer sharing
Windows protocol
TCP/445 without NetBIOS

Question 18

SLP

Answer 18

Service location protocol
Works with AFP (Apple filing protocol)
Populates the list of available devices
tcp and udp 427

Question 19

AFP

Answer 19

Apple filing protocol

• file services in macOS
• tcp/548

Question 20

DHCP

Answer 20

Dynamic host configuration protocol
automatic address/IP config for almost all devices
udp/67 and udp/68

Question 21

LDAP

Answer 21

Lightweight directory access protocol

• store and retrieve info in a network directory
• tcp/389

Question 22

SNMP

Answer 22

Simple network management protocol
-gather stats on network devices
udp/161 and udp/162