Physical Layer

Question 1

What is Access Control?

Answer 1

restricting unauthorized physical access to sensitive locations (server rooms, data centers)

Question 2

Types of Access Control?

Answer 2

(4)
Physical Barriers
Authentication Systems
Surveillance & Monitoring
Visitor Management

Question 3

How to detect physical wiretap?

Answer 3

(3)
Physical Inspection
Signal strength Analysis
Cable Testing

Question 4

What are some cable threats?

Answer 4

(3)
Cable tapped or cut
Electromagnetic Interference
Rodent or Pest Damage

Question 5

What is a guided medium?

Answer 5

A communication channel where signals are guided along a physical path

eg. cables
=> physical access needed to tamper with data

Question 6

What is an unguided medium?

Answer 6

A communication channel where signals propagate freely through air/space

eg. radio or infrared waves

Question 7

Ways to do access control on unguided media?

Answer 7

Range limitation
Directional antennas
Satellite spot beams

Question 8

Ways to implement signal security?

Answer 8

Spreat signals over multiple frequencies
Frequency hopping
Encrypt data