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CompTIA Security+ (SY0-601): Ports & Protocols

Information Technology38 CardsCreated 9 months ago

This section explains port types and ranges, including well-known, registered, and dynamic/private ports. It clarifies the roles of inbound and outbound ports in client-server communication and identifies common protocol port numbers such as FTP (TCP 20, 21), essential for understanding network traffic and firewall configurations.

Report

Port Types:

Port
A logical communication endpoint that exists on a computer or server

Inbound Port
A logical communication opening on a server that is listening for a connection from a client

Outbound Port
A logical communication opening created on a client in order to call out to a server that is listening for a connection

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Key Terms

Term
Definition

Port Types:

Port
A logical communication endpoint that exists on a computer or server

Inbound Po...

Well-Known Ports

Ports 0 to 1023 are considered well-known and are assigned by the Internet Assigned Numbers Authority (IANA)

Registered Ports

Ports 1024 to 49,151 are considered registered and are usually assigned to proprietary protocols

Dynamic/Private Ports

Ports 49,152 to 65,535 can be used by any application without being registered with IANA

FTP

TCP Port 20, 21

SSH/SCP/SFTP

TCP/UDP Port 22

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CompTIA Security+ (SY0-601): Ports & Protocols
TermDefinition

Port Types:

Port
A logical communication endpoint that exists on a computer or server

Inbound Port
A logical communication opening on a server that is listening for a connection from a client

Outbound Port
A logical communication opening created on a client in order to call out to a server that is listening for a connection

Well-Known Ports

Ports 0 to 1023 are considered well-known and are assigned by the Internet Assigned Numbers Authority (IANA)

Registered Ports

Ports 1024 to 49,151 are considered registered and are usually assigned to proprietary protocols

Dynamic/Private Ports

Ports 49,152 to 65,535 can be used by any application without being registered with IANA

FTP

TCP Port 20, 21

SSH/SCP/SFTP

TCP/UDP Port 22

Telnet

TCP/UDP Port 23

SMTP

TCP Port 25

DNS

TCP/UDP Port 53

TFTP

UDP Port 69

HTTP

TCP Port 80

Kerberos

TCP/UDP Port 88

POP3

TCP Port 110

NNTP

TCP Port 119

Network News Transfer Protocol is used to transport Usenet articles

RPC/DCOM-scm

Remote Procedure Call is used to locate DCOM ports request a service from a program on another computer on the network

TCP/UDP Port 135

NetBIOS

TCP/UDP Port 137-139

IMAP

TCP Port 143

SNMP

UDP Port 161

SNMPTRAP

TCP/UDP Port 162

LDAP

TCP/UDP Port 389

HTTPS

TCP Port 443

SMB

TCP Port 445

SMTP over SSL/TLS

TCP Port 465/587

Syslog

UDP Port 514

LDAP over SSL/TLS

TCP/UDP Port 636

iSCSI

iSCSI is used for linking data storage facilities over IP

TCP Port 860

FTPS

TCP Port 989/990

IMAP4 over SSL/TLS

TCP Port 993

POP3 over SSL/TLS

TCP Port 995

MS-SQL-S (Or just SQL)

TCP Port 1433

L2TP

UDP Port 1701

PPTP

TCP/UDP Port 1723

RADIUS

UDP Port
1812 = Authentication/Authorization
1813 = Accounting

Alternative:
1645 = Authorization/Authentication
1646 = Accounting


FCIP

Fibre Channel IP is used to encapsulate Fibre Channel frames within TCP/IP packets

TCP/UDP Port 3225

RDP

TCP/UDP Port 3389

iSCSI Target

iSCSI Target is the listening port for iSCSI-targeted devices when linking data storage facilities over IP

TCP Port 3260

Diameter

A more advanced AAA protocol that is a replacement for RADIUS

TCP Port 3868

Syslog over TLS

TCP Port 6514