CompTIA Network+ N10-008 NET+ Port Numbers - Review

HTTPS (Hypertext Transfer Protocol Secure) over SSL/TLS

TCP over:

• SSL = Secure Socket Layer Encryption

• TLS = Transport Layer Security Encryption

FTP (File Transfer Protocol)

TCP:

• 20 = Used for Data transmission via upload or download.

• 21 = Used to Connect, Start, and Control FTP Sessions.

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.

POP3 (Post Office Protocol version 3)

TCP - Receives email from Servers.

Port 995 = POP3 over TLS Encryption

Oracle SQL (Structured Query Language)

TCP

MySQL = TCP 3306
SQL Server = TCP 1433

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.

NTP (Network Time Protocol)

UDP - Network Time synchronization services.

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.

SSH (Secure Shell)

TCP - Encrypted - Remote Login Service.

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.

FTP (File Transfer Protocol)

TCP:

• 21 = Used to Connect, Start, and Control FTP Sessions.

• 20 = Used for Data transmission via upload or download.

VNC (Virtual Network Computing)

TCP - Cross-platform Remote Desktop Tool.

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.

MySQL (Structured Query Language)

TCP

Oracle SQL = TCP 1521
SQL Server = TCP 1433

HTTP (Hypertext Transfer Protocol)

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

Telnet

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

SIP (Session Initiation Protocol)

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

IMAP (Internet Message Access Protocol)

TCP - Receives email with Management Features from Multiple Clients.

Port 993 = IMAP over TLS Encryption

SMTP (Simple Mail Transfer Protocol)

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

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.

Syslog

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

RDP (Remote Desktop Protocol)

TCP - Desktop Share from a Remote Location.

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)

LDAPS (Lightweight Directory Access Protocol Secure)

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

Port 389 is the TCP unencrypted LDAP.

IMAP over TLS Encryption

TCP over TLS Encryption

Port 143 = IMAP unencrypted

SQL Server (Structured Query Language)

TCP - Database Access

Oracle SQL = TCP 1521
MySQL = TCP 3306

SMTP over TLS Encryption (Simple Mail Transfer Protocol)

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

Port 25 = SMTP unencrypted

POP3 over TLS Encryption (Post Office Protocol version 3)

TCP over TLS Encryption

Port 110 = POP3 unencrypted

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)