NetworkingNetwork+

Cable Types and Connectors for CompTIA Network+ N10-009

Cable types and connectors are directly tested on CompTIA Network+ N10-009, with questions asking you to identify the correct cable for a scenario, recognize connector types, and understand cable specifications. You must know copper twisted pair categories (Cat5e through Cat8), fiber optic types (single-mode vs multimode), coaxial cable, and the connectors used with each. Cable troubleshooting — identifying faults with testers — is also in scope.

9 min

3 sections · 7 exam key points

2 practice questions

Twisted Pair Copper Cables

Twisted pair cables are the most common LAN cable type. Category ratings define the maximum bandwidth and distance. Cat5e: supports 1 Gbps at 100 meters — minimum for new installations. Cat6: 1 Gbps at 100m, 10 Gbps at 55m; improved crosstalk performance. Cat6a: 10 Gbps at 100m — required for full 10GbE runs; thicker and less flexible than Cat6. Cat7: 10 Gbps, fully shielded (STP) — rarely used in practice. Cat8: 25/40 Gbps at 30m — designed for data center switch-to-server connections.

UTP (Unshielded Twisted Pair) is the standard for most office environments — four pairs of twisted copper wires, no shielding, terminated with RJ-45 connectors. STP (Shielded Twisted Pair) adds a foil or braided shield around individual pairs or all pairs — used in high-interference environments like factory floors.

Straight-through cables connect different device types (switch to PC, switch to router). Crossover cables connect like devices (switch to switch, PC to PC) — though modern devices with Auto-MDI/MDIX automatically detect and adjust, making crossover cables mostly obsolete.

Fiber Optic Cables

Single-mode fiber (SMF) has a very small core (~9 microns), uses laser light sources, supports extremely long distances (up to 100 km+), and is used in carrier networks, campus backbones, and data center interconnects. Higher cost. Yellow jacket color convention.

Multimode fiber (MMF) has a larger core (50 or 62.5 microns), uses LED light sources, supports shorter distances (up to 2 km for OM4). Used within buildings and campuses. Lower cost than SMF. Color conventions: OM1/OM2 = orange, OM3 = aqua, OM4 = aqua or magenta, OM5 = lime green.

Common fiber connectors: LC (Lucent Connector) — small form factor, push-pull latch, used in SFP transceivers and patch panels. SC (Subscriber Connector) — square, push-pull, larger than LC. ST (Straight Tip) — bayonet-style twist-and-lock, older. MPO/MTP — multi-fiber connectors for high-density parallel optics.

Coaxial Cable and Other Media

Coaxial cable ('coax') has a center conductor surrounded by insulation, a braided shield, and an outer jacket. Used for cable TV (RG-6) and legacy Ethernet (RG-58 for 10BASE2). Modern use: cable internet (coax from street to home), CCTV cameras, and some RF applications. F-connector (for cable TV), BNC connector (for legacy Ethernet/CCTV).

Direct attach copper (DAC): short copper assemblies with SFP/QSFP connectors at each end, used for high-speed connections (10G/40G) within a rack or between adjacent racks in data centers. Active Optical Cable (AOC): similar form factor but uses fiber — longer reach. Both eliminate traditional patch cord + transceiver combinations.

Serial cables (RS-232, DB-9/DB-25) are used for out-of-band management of routers and switches (console connections). Modern devices use RJ-45-to-USB console cables. Rollover cables (Cisco console cables) have a unique wiring pattern — pin 1 connects to pin 8, pin 2 to pin 7, etc.

Twisted Pair Cable Category Comparison

Category	Max Speed	Max Distance	Use Case
Cat5e	1 Gbps	100 m	Minimum standard for new installs
Cat6	1 Gbps / 10 Gbps*	100 m / 55 m	Office LAN, some 10GbE
Cat6a	10 Gbps	100 m	10GbE full-distance runs
Cat7	10 Gbps	100 m	Shielded, data centers
Cat8	25/40 Gbps	30 m	Data center switch-server

Key exam facts — Network+

Cat5e: 1 Gbps/100m; Cat6a: 10 Gbps/100m; Cat8: 25–40 Gbps/30m
Single-mode fiber = long distance, laser, yellow; multimode = short distance, LED, orange/aqua
UTP = unshielded; STP = shielded (better EMI resistance)
LC connector = small, SFP; SC = square push-pull; ST = bayonet
RJ-45 is the connector for twisted pair Ethernet; F-connector for coax cable TV
Straight-through connects unlike devices; crossover connects like devices
Auto-MDI/MDIX makes crossover cables mostly unnecessary in modern switches

Common exam traps

Cat6 supports 10 Gbps for the full 100 meters

Cat6 only supports 10 Gbps up to 55 meters — Cat6a is required for full 100-meter 10GbE runs

Single-mode and multimode fiber are interchangeable

They use different core sizes and light sources — single-mode uses lasers, multimode uses LEDs. Transceivers must match the fiber type or signals will not transmit correctly

Coaxial cable is obsolete

Coax is still widely used for cable internet (RG-6), CCTV, RF distribution, and some broadcast applications — it is not commonly used for data networking LAN segments

Practice questions — Cable Types

These questions are representative of what you will see on Network+ exams. The correct answer and explanation are shown immediately below each question.

Q1.A data center needs to connect two switches 80 meters apart at 10 Gbps. Which cable type is most appropriate?

A.Cat6

B.Cat6a

C.Cat5e

D.Multimode fiber OM1

Explanation: Cat6a supports 10 Gbps at up to 100 meters. Cat6 only supports 10 Gbps up to 55 meters, so it cannot reliably cover 80 meters at 10 Gbps. Cat5e is limited to 1 Gbps. OM1 multimode fiber could work but is an older, lower-performance fiber standard — Cat6a copper is the correct answer for this distance with copper constraint implied.

Q2.Which fiber connector type is commonly used with small form-factor pluggable (SFP) transceivers in modern network equipment?

A.ST

B.SC

C.LC

D.BNC

Explanation: LC (Lucent Connector) is the standard connector for SFP and SFP+ transceivers due to its small form factor. SC connectors are larger and used in patch panels and older equipment. ST uses a bayonet locking mechanism and is also older. BNC is a coaxial connector, not fiber.

Frequently asked questions — Cable Types

What is the maximum distance for Ethernet over copper?

The IEEE 802.3 standard limits copper Ethernet to 100 meters (approximately 328 feet) for twisted pair cables regardless of category. This covers the horizontal cable run from the switch to the workstation. Fiber must be used for distances beyond 100 meters.

What tools are used to test and certify twisted pair cables?

Cable tester: verifies basic continuity and correct pin-to-pin wiring. Certifier (like Fluke DSX): measures attenuation, near-end crosstalk (NEXT), and other parameters to certify a cable meets category specifications. TDR (Time Domain Reflectometer): measures cable length and locates faults (shorts, opens) by sending pulses and measuring reflections. OTDR (Optical TDR): same concept for fiber optic cables.

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