Q: In which one of the following layers, the firewalls can be installed to keep good packets and bad packets out?
(a)Physical layer
(b)Transport layer
(c)Network layer
(d)Application layer
Correct Answer: (c)
The correct answer is (b): Transport layer. Subject: Geography | Sub-topic: Transport & Infrastructure Geography Note: This answer was determined through AI-based research. Verify against the official answer key when available.