In UTP cables, which category starts by being able to push gigabit network speeds (1000+Mbps)?a.CAT4b.CAT5ec.CAT7d.CAT5

The category that starts being able to push gigabit network speeds (1000+Mbps) in UTP cables is b. CAT5e.

Here's a step-by-step explanation:

1. CAT4: This category of UTP cable is not capable of supporting gigabit network speeds. It was mainly used for token ring networks and supports speeds up to 16 Mbps.

2. CAT5: This category can support speeds up to 100 Mbps. It was commonly used for networks running at 10 or 100 Mbps.

3. CAT5e: This is the first category that supports gigabit network speeds (1000+ Mbps). The 'e' stands for 'enhanced', and these cables are designed to reduce crosstalk, thus allowing for higher data speeds.

4. CAT7: This category also supports gigabit network speeds and even higher, up to 10 Gbps. However, it's not the first one to do so.

So, the correct answer is b. CAT5e.