2.1 Common Network Ports

Question 1

FTP - File Transfer Protocol

Answer 1

• tcp/20 (active mode data)
• tcp/21 (control)

Authenticates with Username and Password

Full-features functionality - List, add, delete, etc..

Question 2

SSH - Secure Shell

Answer 2

tcp/22

Encrypted communication link

Looks and acts the same as Telnet

Question 3

Telnet - Telecommunications Network

Answer 3

tcp/23

• Log in remotely to a device
• Console access
• In the clear communication.

Question 4

SMTP - Simple mail Transfer Protocol

Answer 4

tcp/25

• Server to server email transfer
• Also sends mail from a device to a server

Question 5

DNS - Domain Name System

Answer 5

udp/53

-Converts names to IP addresses

Question 6

HTTP & HTTPS - Hypertext Transfer Protocol

Answer 6

tcp/80

tcp/443

Communication in the browser

Question 7

POP & IMAP - Post Office Protocol & Internet Messaging Access Protocol

Answer 7

*POP3

• tcp/110
• basic mail transfer functionality

*IMAP

• tcp/143
• Includes management of email inbox

Question 8

RDP - Remote Desktop Protocol

Answer 8

tcp/3389

• Share a desktop from a remote location
• Can connect to an entire desktop or just an application

Question 9

SMB - Server Message Block (CIFS)

Answer 9

445

• Protocol used by Microsoft Windows
• File sharing or printer sharing
• Also called CIFS (Common Internet File System)

Question 10

NetBios name service
NetBios datagram service
NetBios session service

Answer 10

• udp/137
• udp/138
• udp/139

Question 11

AFP - Apple Filing Protocol

Answer 11

-tcp/548

File service in MacOS

• Works with SLP (Service Location Protocol)
• tcp/427
• udp/427

Question 12

DHCP - Dynamic Host Configuration Protocol

Answer 12

• udp/67
• udp/68

Automated configuration of IP addresses

Question 13

LDAP - Lightweight Directory Access Protocol

Answer 13

tcp/389

Store and retrieve credentials

Question 14

SNMP - Simple Network Management Protocol

Answer 14

udp/161 - Query devices
udp/163 - Traps

Gather statistics from network devices