Cables

Question 1

10 Mbps (Ethernet Speed)

Answer 1

Common Name: Ethernet
IEEE Standard: 802.3i
Informal Name: 10BASE-T
Max Length: 100m
2 pairs (4 wires)

Question 2

100 Mbps (Ethernet Speed)

Answer 2

Common Name: Fast Ethernet
IEEE Standard: 802.3u
Informal Name: 100BASE-T
Max Length: 100m
2 pairs (4 wires)

Question 3

1 Gbps (Ethernet Speed)

Answer 3

Common Name: Gigabit Ethernet
IEEE Standard: 802.3ab
Informal Name: 1000BASE-T
Max Length: 100m
4 pairs (8 wires)

Question 4

10 Gbps (Ethernet Speed)

Answer 4

Common Name: 10 Gig Ethernet
IEEE Standard: 802.3an
Informal Name: 10GBASE-T
Max Length: 100m
4 pairs (8 wires)

Question 5

What does UTP stand for ?

Answer 5

Unshielded Twisted Pair

Question 6

Why are Ethernet cables twisted in pairs ?

Answer 6

To protect againts Electromagnetic Interference

Question 7

What is full duplex transmission ?

Answer 7

Cables can send and recieve data at the same time by using different cable pairs to send and recieve.

Question 8

What pins do Routers, Firewalls and PCs use to send and recieve data ?

Answer 8

Send: 1 and 2
Recieve: 3 and 6

Question 9

What pins do Switches use to send and recieve data ?

Answer 9

Send: 3 and 6
Recieve: 1 and 2

Question 10

What is Auto MDI-X ?

Answer 10

Auto MDI-X, or automatic medium-dependent interface crossover, is a technology that can automatically detect the required cable connection type and configure the connection (straight-through / crossover). It’s also known as “auto crossover”.

Question 11

What cable pairs do 1000BASE-T and 10GBASE-T use ?

Answer 11

1 and 2
3 and 6
4 and 5
7 and 8
All pairs are bi-directional (pairs aren’t only send or recieve)

Question 12

4 parts of Fiber-Optic cable

Answer 12

1 Fiberglass Core
2 Cladding that reflects light
3 Protective Buffer
4 Outer jacket of cable

Question 13

Multi-mode Fiber Cable

Answer 13

• Core diameter is wider than single-mode
• Allows multiple angles (modes) of light waves to enter the fiberglass core
• Allows longer cables than UTP but shorter cables than single-mode fiber
• Cheaper than single-mode fiber (LED based SFP transmitters)

Question 14

Single-mode Fiber Cable

Answer 14

• Core diameter is narrower than multi-mode
• Light enters at a single angle (mode) from a laser-based transmitter
• Allows longer cables than UTP and multi-mode fiber
• More expensive than multi-mode fiber (laser-based SFP transmitters)

Question 15

1000BASE-LX

Answer 15

IEEE Standard: 802.3z
Speed: 1 Gbps
Cable Type: Single-Mode or Multi-Mode
Max Length: 550m / 5km

Question 16

10GBASE-SR

Answer 16

IEEE Standard: 802.3ae
Speed: 10 Gbps
Cable Type: Multi-Mode
Max Length: 400m

Question 17

10GBASE-LR

Answer 17

IEEE Standard: 802.3ae
Speed: 10 Gbps
Cable Type: Single-Mode
Max Length: 10km

Question 18

10GBASE-ER

Answer 18

IEEE Standard: 802.3ae
Speed: 10 Gbps
Cable Type: Single-Mode
Max Length: 30km