2. What is Network Security?
 consists of the provisions
and policies adopted by the network
administrator to prevent and
monitor unauthorized access, misuse, m
odification, or denial of the computer
network and network-accessible
resources.

3. Security Challenges
 Computer Security Institute (CSI)
 Survey: over 70% networks have
experienced security breach
 From the 70%, 60% have undergone
internal breaches and only 40% are
external or perimeter breaches.

4. 2 Main reasons why security has
became more important as an issue
over time
 The hacking and attack tools have
become more and more
dangerous, where an attack can cause
serious financial damage to a company
 The hacking and attack tools have
become easier to use- in most
cases, they are automated, allowing
even a novice to use them.

5. Security Roles
 Have changed over the years
 In the past networks were closed to the
outside world, thus attack didn’t cause
much damage
 Mid 1990s, Internet has exploded which
increases the possibility of security
breach

6. Security Issues
 Security is a business problem not just a
technology problem
 The concept of security is an illusion
 Managing security means managing the
perception of others
 There are many different security
technologies to choose from
 You must create a comprehensive
security policy

7. Security Goals
 Create and implement a
single, cohesive, company-wide security
policy
 Don’t allow products to dictate security
policies – policies should drive the
products that you choose
 Centralize security management

8. Security Components
Security is a relative or subjective problem
 Authentication
 Authorization
 Privacy
 Integrity
 Availability
 Nonrepudiation
 Accounting

9. Authentication
 Verifying a person’s identity (who they
are)

10. Authorization
 Controlling access to resources (what
they are trying to do)

11. Privacy
 Protecting confidentiality of information
(what the content of the information is)

12. Integrity
 Validating that information was not
changed (verifying that the information
that was received has not been modified
or tampered with)

13. Availability
 Providing redundancy for security
(ensuring that you have a fallback
solution in the event of failure or security
compromise)

14. Nonrepudiation
 Proving that a transaction took place
between two entities (when using online
transactions, having verifiable proof that
the transaction took place between 2
entities)

15. Accounting
 Recording information about an
employee’s actions when interacting
with data and systems as well as
information about the operation
(including security events) of your
networking devices

16. Data Classification for
Public/Government Agencies
 Unclassified data
- data has few or no confidentiality
requirements.
 Sensitive but unclassified (SBU) data
- data could prove embarrassing if
revealed, but no serious security breach
would occur.
 Confidential data
- Lowest level of classified data, where data
protection must meet confidentiality
requirements

17. Data Classification for
Public/Government Agencies
 Secret data
- A significant effort must be made to
secure data, limiting access to a small
number of people
 Top Secret data
- Great effort and cost is used to secure
data, limiting access to a very small
number of people (need to know access)

18. Data Classification for private
companies or nongovernment
 Public data - data is publicly
available, as on a website
 Sensitive data - similar to SBU
 Private data – data is important to a
company; an effort must be made to
secure it and verify that it is accurate
 Confidential data – data is very
important to a company, like trade
secrets and employee records

19. Classification Criteria
 Value
 Personal Association
 Age
 Useful Life

20. Classification Procedures
 Who is responsible for the data?
 How should the information be
classified, with any exceptions?
 How are the controls used for
classification policies?
 When and how does declassification of
data occur?

21. Classification Roles
Role Description Performed By
Owner Is ultimately responsible for the Typically a member of the
data management staff
Custodian Is responsible for the security of Typically a member of the IT
the data on a day-to-day basis staff
User Is responsible for using the data Your typical user, who can
according to defined policies “see the trees, but not the
and operating procedures forest” in the company and
who has a ground-level view
of certain data

22. Security Controls
 Preventive – used to prevent a data
compromise
 Deterrent – used to scare away a certain
number of ill-doers
 Detective – used to detect access to
data

23. 3 Categories that control the
implementation of the security control
 Administrative – policy and procedural
controls
 Technical – electronics, hardware, and
software controls
 Physical – mechanical controls

24. Security Breaches: Prosecuting
attackers and hackers
 Motive
 Why did they do it?
 Opportunity
 Were they available to commit the crime?
 Means
 Did they have the capability to commit the
crime?

25. Liability: Legal and
Governmental Issues
 A company should practice due
diligence and due care when protecting
sensitive data and resources.
 A company can be sued by its
customers or employees if a breach on
sensitive data happens
 Deal with government laws that
requiring a minimal security level when
protecting certain resources.

26. On the Job
 Examine security in your network from
endpoint to endpoint, from where traffic
enters your network, to where your
users connect (switches, access
points, and remote access VPN
gateways)
 Select a product solution that focuses on
end-to-end security

27. Questions
 What are the benefits that an
organization would get from properly
classifying data?
 Research about the 10 commandments
of computer ethics by the Computer
Ethics Institute