Final answer:
Damaged legacy CCB blocks should be replaced with new CCB blocks to maintain system integrity. Other cable types like Cat5e, fiber optic, and coaxial cannot substitute for CCBs as they serve different roles in network infrastructure. The correct answer is Option 2.
Step-by-step explanation:
If encountered on site, legacy CCB blocks that are damaged must be replaced with new CCB blocks. CCB, which stands for concrete communications bunker, is infrastructure related to telecommunications. When these specific blocks are damaged, replacing them with the same type of block is usually the standard practice to maintain the integrity of the systems they support. Therefore, the correct answer is Option 2: New CCB blocks.
While other options like Cat5e cables, fiber optic cables, and coaxial cables are associated with networking and data transmission, they are not interchangeable with structural components like CCBs. These cable types serve different functions in a network infrastructure and cannot be used as a substitute for a CCB block.