INSTALLATION BASICS, DEVICE
CONFIGURATION, AND TROUBLESHOOTING
SUMMARY 2026
◉ UDP.
Answer: checksums are optional, just sends messages no ACKs or
anything additional. Throw the baby
◉ Port Reserves.
Answer: 0-1023: reserved for known protocol. 1024-49151: known
as user ports. 49152-65535: private ports.
◉ TCP Socket States.
Answer: Goes through the handshake, normal state of connection,
data may be transmitted, client requests termination, server
proceeds closing, termination request local on client, wait for final
ACK.
◉ Security.
Answer: state of freedom from a danger or a risk. Protective
measures are created and maintained. Focus on software security.
,◉ Computer information technology security.
Answer: protects computing resources from attack, theft, or
malicious use
◉ information security.
Answer: protects the confidentiality, integrity and availability of
information on the devices that store, manipulate, and transmit the
information through products, people, and procedures.
◉ Cyber Security.
Answer: narrow application of computer security to networked
computer devices.
◉ CIA.
Answer: C- Confidentiality - information that may be disclosed to
unauthorized party. I - Integrity - has to be the original data and has
not been manipulated. A - Availability - information has to be
available according to a certain quality definition.
◉ Tools for Confidentiality.
Answer: encryption, access control, authentication, authorization,
physical security
◉ encryption.
, Answer: transformation of information using an encryption key so
that it can only be read using that key
◉ Access Control.
Answer: rules and policies that limit access to confidential
information to those people and or systems with a need to know.
◉ Authentication.
Answer: a determination of the identity or role of an agent, usually
based on combo of - something the agent has, agent knows, agent is.
◉ Authorization.
Answer: determination if an agent is allowed access to something
based on access control policy. prevent attacker from tricking a
system into letting it have access to protected resources.
◉ Tools for integrity.
Answer: backups - a periodic archiving of data. checksums - function
that maps file contents to a numerical value. Data correcting code -
methods for storing data in such a way that small changes can be
easily detected and automatically corrected.
◉ Availability Tools.