Security+ Notes Section 16: Security
Infrastructure (Objectives 3.2 and 4.5)
Port -✔✔Logical communication endpoint that exists on a computer or server
%
Inbound Port -✔✔logical communication opening on a server that is listening for a connection from a
client
Outbound Port -✔✔Logical communication opening created on a client in order to call out to a server
that is listening for a connection
0
Port Numbers -✔✔Anywhere from 0 to 65,535, certain ranges reserved for specific things
Well-Known Ports -✔✔0-1023 are assigned by the Internet Assigned Numbers Authority (IANA) for
commonly used protocols
0
Registered Ports -✔✔1024-49,151 are usually assigned to proprietary protocols registered by
vendors
Dynamic and Private Ports -✔✔49,152-65,535 can be used for any application without being
1
registered with IANA, usually used by client whenever it needs a random high number port. Also used
for misc things such as gaming
Protocol -✔✔Rules governing device communication and data exchange that specifies format and
sequence of messages
File Transfer Protocol (FTP) -✔✔Port 21 (TCP), transfer files from host to host
Secure Shell (SSH) -✔✔Port 22 (TCP), provides secure remote terminal access and file transfer
Telnet -✔✔Port 23 (TCP), provides insecure remote control of a machine using text-based
environment, essentially old version of SSH, don't use it
Simple Mail Transfer Protocol (SMTP) -✔✔Port 25 (TCP), provides ability to send emails over the
network
, Domain Name System (DNS) -✔✔Port 53 (TCP and UDP), translates domain names to IP address
Trivial File Transfer Protocol (TFTP) -✔✔Port 69 (UDP), Lightweight, simplified FTP often used with
network-based operating systems for things such as sending config files or network booting
%
Hypertext Transfer Protocol (HTTP) -✔✔Port 80 (TCP), insecure web browsing
Post Office Protocol Version Three (POP3) -✔✔Port 110 (TCP), retrieves email from a server
0
Network News Transfer Protocol (NNTP) -✔✔Port 119 (TCP), accessing news groups
Remote Procedure Call (RPC) -✔✔Port 135 (TCP and UDP), facilitates communication between
different system processes, often used as part of Windows file sharing system
0
NetBIOS -✔✔Ports 137, 138, and 139 (TCP and UDP), network protocol suite used inside of a
Windows domain environment for sharing things such as internal network names as well doing file
and printer sharing in a local Windows environment
1
Internet Message Access Protocol (IMAP) -✔✔Port 143 (TCP), allows access to email messages on
a server
Hypertext Transfer Protocol Secure (HTTPS) -✔✔Port 443 (TCP), provides secure web
communication
Server Message Block (SMB) -✔✔Port 445 (TCP), used for file and printer sharing over a network
Secure Mail Transfer Protocol Secure (SMTPS) -✔✔Ports 465 and 587 (TCP), provides secure
SMPT email communication
Syslog -✔✔Port 514 (UDP), used for sending log messages
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller EXAMQA. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $11.49. You're not tied to anything after your purchase.
