NET+ Port Numbers - Review

Question 1

PORT 443?

Answer 1

HTTPS (Hypertext Transfer Protocol Secure) over SSL/TLS

TCP over:

• SSL = Secure Socket Layer Encryption
• TLS = Transport Layer Security Encryption

Question 2

PORT 20?

Answer 2

FTP (File Transfer Protocol)

TCP:

• 20 = Used for Data transmission via upload or download.
• 21 = Used to Connect, Start, and Control FTP Sessions.

Question 3

PORT 389?

Answer 3

LDAP (Lightweight Directory Access Protocol)

TCP - For accessing and maintaining distributed Directory information services over an Internet Protocol (IP) Network.

Port 636 - LDAP TCP over SSL Encryption, nonstandard of LDAP.

Question 4

PORT 110?

Answer 4

POP3 (Post Office Protocol version 3)

TCP - Receives email from Servers.

Port 995 = POP3 over TLS Encryption

Question 5

PORT 1521?

Answer 5

Oracle SQL (Structured Query Language)

TCP

MySQL = TCP 3306
SQL Server = TCP 1433

Question 6

PORT 88?

Answer 6

Kerberos

TCP/UDP - Computer-Network authentication protocol that works on the basis of Tickets to allow nodes communicating over a non-secure Network to prove their identity to one another in a secure manner.

Question 7

PORT 123?

Answer 7

NTP (Network Time Protocol)

UDP - Network Time synchronization services.

Question 8

PORT 69?

Answer 8

TFTP (Trivial File Transfer Protocol)

UDP - Very simple File Transfer Protocol, quick and easy to setup. Not used to transfer over the Internet, used in LANs.

Question 9

PORT 22?

Answer 9

SSH (Secure Shell)

TCP - Encrypted - Remote Login Service.

Question 10

PORT 53?

Answer 10

DNS (Domain Name Service)

UDP
TCP - For large transfers.
- Resolves Frequently Qualified Domain Names (FQDNs) to IP Addresses.
- Reverse DNS resolves IP Addresses to FQDNs.

Question 11

PORT 21?

Answer 11

FTP (File Transfer Protocol)

TCP:

• 21 = Used to Connect, Start, and Control FTP Sessions.
• 20 = Used for Data transmission via upload or download.

Question 12

PORT 5900?

Answer 12

VNC (Virtual Network Computing)

TCP - Cross-platform Remote Desktop Tool.

Question 13

PORT 445?

Answer 13

SMB (Server Message Block)

TCP - Network File Sharing Protocol that allows applications on a computer to read and write to files and to request services from Server programs in a computer Network.

Question 14

PORT 3306?

Answer 14

MySQL (Structured Query Language)

TCP

Oracle SQL = TCP 1521
SQL Server = TCP 1433

Question 15

PORT 80?

Answer 15

HTTP (Hypertext Transfer Protocol)

TCP - World Wide Web, Web server Communications - unsecured.

Question 16

PORT 23?

Answer 16

Telnet

TCP - Remote Console Access/Login Service - “in-the-clear” communication, no encryption.

Question 17

PORT/s 5060 & 5061?

Answer 17

SIP (Session Initiation Protocol)

TCP/UDP - Signalling protocol used for initiating, maintaining, modifying and terminating real-time unified communication sessions between IP devices.

Question 18

PORT 143?

Answer 18

IMAP (Internet Message Access Protocol)

TCP - Receives email with Management Features from Multiple Clients.

Port 993 = IMAP over TLS Encryption

Question 19

PORT 25?

Answer 19

SMTP (Simple Mail Transfer Protocol)

TCP - Server to Server SENDing/Transfer of Email
Port 587 is used for SMTP over TLS Encryption.

Question 20

PORT/s 161 & 162?

Answer 20

SNMP (Simple Network Management Protocol)

UDP:
161 = Sends commands to gathers statistics from Network Devices.
162 = Alerts and Notifications from SNMP managed Network Devices.

Versions:

• v1 = “in the clear”, No Encryption
• v2 = Still “in the clear”, No Encryption but allowed BULK Transfers.
• v3 = Encrypted, Authentication, with Message Integrity.

Question 21

PORT 514?

Answer 21

Syslog

UDP - Standard for Message Logging, usually a central log collector where logs are consolidated (SIEM).
SIEM = Security Information Event Manager

Question 22

PORT 3389?

Answer 22

RDP (Remote Desktop Protocol)

TCP - Desktop Share from a Remote Location.

Question 23

PORT/s 67 & 68?

Answer 23

DHCP (Dynamic Host Configuration Protocol)

UDP - Automatic configuration of IP Addresses, Subnet Mask, and other configuration settings.

• 67 = Servers Listening
• 68 = Clients Listening

Dynamic = Pooled = Lease Times
DHCP Reservations = Addresses are assigned by MAC Addresses in the DHCP Server. (Reserved)

Question 24

PORT 636?

Answer 24

LDAPS (Lightweight Directory Access Protocol Secure)

TCP - over SSL encryption
Nonstandard implementations of LDAP with Encryption.

Port 389 is the TCP unencrypted LDAP.

Question 25

PORT 993?

Answer 25

IMAP over TLS Encryption

TCP over TLS Encryption

Port 143 = IMAP unencrypted

Question 26

PORT 1433?

Answer 26

SQL Server (Structured Query Language)

TCP - Database Access

Oracle SQL = TCP 1521
MySQL = TCP 3306

Question 27

PORT 587?

Answer 27

SMTP over TLS Encryption (Simple Mail Transfer Protocol)

TCP using TLS Encryption for Server to Server email SENDing/Transfers.

Port 25 = SMTP unencrypted

Question 28

PORT 995?

Answer 28

POP3 over TLS Encryption (Post Office Protocol version 3)

TCP over TLS Encryption

Port 110 = POP3 unencrypted

Question 29

PORT 520?

Answer 29

RIP (Routing Information Protocol)

• is one of the oldest distance-vector routing protocols which employs the hop count as a routing metric.
• prevents routing loops by implementing a limit on the number of hops allowed in a path from source to destination.
• The largest number of hops allowed for RIP is 15, which limits the size of networks that RIP can support.
• UDP PORT/s 520 (Messages) & 521 (Updates)