To answer this question, you need to understand the advantages of fiber-optic cables over copper cables from a security perspective. Let's go through each option to understand why it is correct or incorrect:
Option A) Fiber optics provides higher bandwidth - This option is not directly related to security. While it is true that fiber-optic cables can provide higher bandwidth compared to copper cables, it is not specifically an advantage in terms of security.
Option B) Fiber optics are more difficult to wiretap - This option is correct. Fiber-optic cables are more difficult to wiretap compared to copper cables. This is because fiber-optic cables transmit data using light pulses, which are more challenging to intercept and tap into without disrupting the signal. In contrast, copper cables transmit data using electrical signals, which can be more easily intercepted.
Option C) Fiber optics are immune to wiretap - This option is incorrect. While it is true that fiber-optic cables are more difficult to wiretap, they are not completely immune to wiretapping. Skilled attackers can still potentially tap into fiber-optic cables, but it is significantly more challenging compared to copper cables.
Option D) None — the two are equivalent; network security is independent from the physical layer - This option is incorrect. While network security is not solely dependent on the physical layer, the physical layer can still play a role in enhancing security. Fiber-optic cables provide an additional layer of security compared to copper cables due to their increased difficulty in wiretapping.
The correct answer is B) Fiber optics are more difficult to wiretap. This option is correct because fiber-optic cables are indeed more challenging to intercept and wiretap compared to copper cables.