Network Security Basics

Question 1

Network Attack Methods

Answer 1

• Spoofing
• Storm Floods
• Man in the middle
• Relay attacks
• Sniffing
• Session hijacking
• Buffer or stack overflow
• Brute force or dictionary
• Known Vulnerabilies not patched

Question 2

What is a Firewall?

Answer 2

Inter-network connection device that restricts data communication traffic betwen two connected networks.

Question 3

Mention Firewall classes

Answer 3

• Packet Filter
• Stateful Inspection
• Application Proxy and Deep Packet Inspection

Question 4

Packet Filter Firewall on wich ISO/OSI layer does it work?

Answer 4

Layer 4 - Packet Filter: Source, Destination, ports

Question 5

DPI Firewall on wich ISO/OSI layer does it work?

Answer 5

Layer 7 - Application

Question 6

True of False

Firewall is only as good as its rules

Answer 6

True

Zones and Conduits

Question 7

IACS Firewalls

Answer 7

• Industrial form factor and robusness
• Electrician / Control Tech friendly
• Knowledge of industrial protocols
• Extesibility beyond just packet filtering

Question 8

Data Diodes

Answer 8

Network device allowing data to travel only in one direction (Uniderctional Gateway)

Usually used to send data from Process Control Network (PCS) to Business Network (IT or Corp Network)

Question 9

What is a mechanism used to control access to and from a network by blocking traffic?

Answer 9

Firewall

Question 10

What is the best practice for IACS firewall configuration?

Answer 10

It is best to limit the number of rules

Question 11

What are the two main types of Instrusion Detection Systems (IDS)?

Answer 11

• Network
• Host Based

Question 12

True or False

Diodes devices can only transmit data in single direction and are more secure than a firewall.

Answer 12

True