Common Ports

Question 1

WHAT IS FTP

Answer 1

File Transfer Protocol

Sends and receives files between systems

Question 2

What are the FTP(File Transfer Protocol) TCP/Ports (Active and control modes)?

Answer 2

tcp/20(Active mode data), tcp/21(control)

*Transfers files between systems

Question 3

What is SSH?

Answer 3

Secure Shell

Encrypted communication link
*looks and acts the same as Telnet

Question 4

What is SSH tcp port?

Answer 4

tcp/22

Question 5

What is Telnet

Answer 5

Telecommunications Network

*Login to devices remotely

*In the clear communication

Question 6

What is Telnet tcp port?

Answer 6

tcp/23

Question 7

What is SMTP?

Answer 7

Simple Mail Transfer Protocol
*transfers mail between mail servers
*Used to send mail from a devices to a mail server
*Commonly configured on mobile devices and email clients

Question 8

What is the SMTP(Simple Mail Transfer Protocol) tcp port?

Answer 8

tcp/25

Question 9

What is DNS

Answer 9

Domain Name System
*converts domain names to IP address

Question 10

What is the UDP port for DNS(Domain Name System)

Answer 10

UDP/53

Question 11

What is HTTP and HTTPS

Answer 11

Hypertext transfer Protocol (*Secure)

*Communication in browser and by other applications

Question 12

What is the TCP port numbers for HTTP and HTTPS?

Answer 12

HTTP - TCP 80
HTTPS - TCP 443

Question 13

What is POP3 tcp port?

Answer 13

Tcp/110

Question 14

What is IMap4 tcp port?

Answer 14

Tcp/143

Question 15

RDP key attributes

Answer 15

Remote Desktop Protocol
* Share a desktop from a remote location
* remote desktop services on many window versions
* can connect to an entire desktop or just application
* clients for windows, MacOS, Linus, Unix, IPhone, Androids, and others

Question 16

What is RDP( Remote Desktop Protocol) tcp/port?

Answer 16

Tcp/3389

Question 17

What is SMB key attributes

Answer 17

Server Message Block
Protocol used by Microsoft Windows
* File sharing - Printer Sharing
Also called (CIFS - COMMON INTERNET FILE SERVICE

Question 18

What is DHCP?

Answer 18

Dynamic Host Configuration Protocol

*Auto Configuration of IP address, subnet mask and other options

*Requires a DHCP server

*Dynamic/pooled - IPs assigned in real time from a pool, each system has a lease and must renew at set intervals

Question 19

What is DHCP(Dynamic Host Configuration Protocol) UDP port numbers

Answer 19

UDP/67
UDP/68

Question 20

What is POP3?

Answer 20

Post Office Protocol V.3

Basic mail functionality from

Question 21

What is IMAP4?

Answer 21

Internet Message Access Protocol V.4

*Manages of email boxes from multiple clients

Question 22

What is SMB UDP ports for older Window systems?

Answer 22

UDP/137 - NetBIOS name services (nbname)
*finds devices on your network by name

TCP/139 - NetBIOS session service (nbsession)
*Sets up a session • Transfers data between devices

Question 23

Whats the TCP port for SMB for modern window systems?

Answer 23

TCP/445 - Direct SMB communication over TCP without NetBIOS transport

Question 24

What is SNMP

Answer 24

Simple Network Management Protocol

*Gather stats from network devices
Using Queries and Traps

Question 25

What are SNMP (Simple Network Management Protocol) UDP ports?

Answer 25

UDP/161 - QUERIES
*network management devices receiving proformance details

UDP/162 - TRAPS
*if metrics are exceeded, it sends an alert to management system

Question 26

What are the 3 versions of SNMP?

Answer 26

V.1(Orginal)
*Structured Tables
*In-The-Clear

V.2(Step-Up)
*Data type enhancements
*Bulk Transfers
*In-The-Clear

V.3(Secure Standard)
*message integrity
*Authentication
*Encrypted

Question 27

What is LDAP?

Answer 27

LightWeight Directory Access Protocol

*stores and retrieves information in a network directory
*Commonly used in Microsoft Active Directory

Question 28

What is LDAP (Lightwieght Directory Access Protocol) TCP port?

Answer 28

tcp/389

Question 29

What is NetBIOS Three port numbers?

Answer 29

• NBName: UDP/137 and TCP/137
• NBDatagram: UDP/138
• NBSession: TCP/139