Cat5e, Cat6, Cat6a, Cat7 — the labels suggest a simple ladder where higher is always better, but the right choice depends on your speed, your distances, and a couple of standards traps worth avoiding. For most homes, the answer is less than you'd expect.

What the categories actually mean

An Ethernet cable's "category" defines the electrical performance it's certified for — chiefly its bandwidth (measured in MHz) and, by extension, the data rates and distances it can reliably support. More bandwidth and better internal construction let a cable carry faster signals with less crosstalk, especially over longer runs. That's the whole story; everything else is detail.

The categories, one by one

Cat5e

The workhorse. "Enhanced" Cat5 is rated for 100 MHz and comfortably handles Gigabit Ethernet (1 Gbps) up to 100 meters (328 feet). Under favorable conditions many Cat5e runs will even carry 2.5 Gbps. For the overwhelming majority of homes still on gigabit internet and gigabit LANs, Cat5e is not a compromise — it's genuinely sufficient, and it's the cheapest and thinnest to route.

Cat6

Rated for 250 MHz with tighter internal construction (often a plastic spline separating the pairs) to reduce crosstalk. Cat6 handles gigabit easily and supports 10 Gbps — but only up to about 55 meters (180 feet), and less in high-interference environments. Beyond that distance a Cat6 run falls back to slower speeds. It's a sensible default for new wiring where you want some future headroom without paying for the top tier.

Cat6a

The "a" means augmented: 500 MHz bandwidth and enough shielding or thicker construction to carry 10 Gbps across the full 100 meters. This is the practical choice when you genuinely need 10G over real household distances. The trade-off is physical — Cat6a is noticeably thicker, stiffer, and harder to bend around tight corners, which matters when you're fishing it through walls.

Cat7 (and a word on Cat8)

Here's the trap. Cat7 was never ratified as a standard by the same bodies (TIA) that define Cat5e through Cat6a, and in its original form it uses non-standard connectors (GG45 or TERA) rather than the familiar RJ45. Much of what's sold online as "Cat7" is really shielded cable terminated in ordinary RJ45 plugs — which makes it, functionally, Cat6a with marketing. For a home network there's little reason to seek out true Cat7. Cat8 is a real ratified standard (2 GHz, up to 40 Gbps) but only over very short runs (~30 meters) and is aimed at data-center server-to-switch links, not houses.

Category comparison

Category	Max speed	Bandwidth	10G distance	Typical use
Cat5e	1 Gbps (often 2.5G short runs)	100 MHz	Not rated	Gigabit homes, general use
Cat6	10 Gbps (short runs)	250 MHz	~55 m	New wiring, 2.5G/5G, short 10G
Cat6a	10 Gbps	500 MHz	100 m	Full-distance 10G, future-proofing
Cat7*	10 Gbps	600 MHz	100 m	Niche; non-standard connectors

*Not a TIA-ratified category; most RJ45 "Cat7" performs like Cat6a.

Shielding: UTP vs. STP

Cables come unshielded (UTP) or shielded (STP/FTP). Shielding adds a foil or braid around the pairs to reject electromagnetic interference. For a typical home, UTP is the right call: it's cheaper, thinner, more flexible, and shielding only helps in genuinely noisy environments — runs alongside electrical conduit, industrial gear, or very long parallel power lines. Shielded cable also needs proper grounding to work as intended; done wrong, it can perform worse than plain UTP. Reach for STP only when you have a specific interference problem to solve, which most houses don't.

Stranded vs. solid conductors

A detail that trips up DIY runs. Solid-core cable uses a single wire per conductor: it carries signal better over distance and is meant for permanent in-wall runs terminated at keystone jacks or patch panels. Stranded cable uses many thin wires per conductor, making it flexible and durable against repeated bending — ideal for the short patch cables between a wall jack and your device. Use solid for the runs inside walls, stranded for the patch cords that get moved around. Mixing them up — stranded in-wall or solid as a flexed patch cable — leads to marginal, unreliable connections.

Practical buying advice

• Still on gigabit? Cat5e is genuinely fine. Don't overspend for speed your gear can't use.
• Wiring a house from scratch? Run Cat6 or Cat6a in-wall. Labor and drywall repair dwarf the cable cost, so buy the headroom once rather than re-pulling later.
• Chasing full 10G over long distances? Cat6a is the honest answer; accept the thicker, stiffer cable.
• Buying patch cables? Get stranded, in the length you need — excess coiled cable is just clutter, not a performance problem at these lengths.
• Tempted by "Cat7/Cat8" for the house? Skip it. You're paying for data-center specs or a mislabeled Cat6a.

The short version

For a gigabit home, Cat5e does the job. For new in-wall wiring or a jump to 2.5G/5G/10G, Cat6 covers most runs and Cat6a covers the long ones at full 10G. Stay unshielded unless you have a real interference problem, match solid cable to in-wall runs and stranded to patch cords, and treat "Cat7" and "Cat8" as answers to questions your house isn't asking. Get the category right for the speed you'll actually run, and the cable will quietly outlast everything else in your network.