Chapter 4 - Modern Ethernet

Question 1

With 100BaseT, what is the maximal distance between the hub (or switch) and the node?

Answer 1

100m

Question 2

What type of cable and connector does 100BaseFX use?

Answer 2

Multimode fiber with ST or SC connectors.

Question 3

How many pairs of wire do 10BaseT and 100BaseT use.

Answer 3

2 wire pairs.

Question 4

What standard does IEEE 802.3ab describes?

Answer 4

1000BaseT.

Question 5

What is the big physical difference between 1000BaseSX and 100BaseFX?

Answer 5

1000BaseSX uses SC connetors excusively.

Question 6

What is the maximal distance for 100BaseLX without repeater?

Answer 6

5 km.

Question 7

How many wire pairs does 1000BaseT uses?

Answer 7

4.

Question 8

What is the standard connector for the 10 GbE fiber standard?

Answer 8

There is no standard; the 10GbE committee has left this up to the manufacturers.

Question 9

What is the maximal lenght of cable for 10GBaseT over Cat 6?

Answer 9

55m.

Question 10

What is a multispeed autosensing NIC?

Answer 10

A NIC that can negotiate a signalling speed before the start of the communication. Today, virtually all NIC are multispeed and autosensing. It the good old time, these devices were refered as 10/100/1000 NIC.

Question 11

What is 100BaseFX?

Answer 11

100 Mbps Ethernet over multimode fiber (ST or SC). Maximal lenght of 2 km. 850 nm.

Question 12

Can 100BaseT communicate in full duplex?

Answer 12

Yes, if the NIC supports it.

Question 13

What is 1000BaseSX?

Answer 13

1000 Mbps Ethernet over multimode fiber (commonly LC). Maximal length of 220 to 500m. 850 nm.

Question 14

What is 1000BaseLX?

Answer 14

1000 Mpbs Ethernet over monomode fiber (Commonly LC and SC). Maximal length of 5km. 1310nm.

Question 15

What are the 3 types of fiber mechanical connections?

Answer 15

PC (physical contact), UPC (ultra physical contact), APC (angled physical contact, 8 degree).

Question 16

What is a GBIC?

Answer 16

A GBIC (Gigabit Interface Converter) is a transceiver module used in networking to provide a modular interface for various types of optical or electrical connections in network devices, such as switches and routers. GBICs enable the flexibility to connect different types of media, such as fiber optic or copper, by simply replacing the GBIC module.

GBICs support different data rates and communication distances, making them versatile components in networking equipment. They are often used for Gigabit Ethernet and Fibre Channel connections. As technology has advanced, GBICs have been largely replaced by smaller form-factor pluggable (SFP) modules in modern networking equipment.

The modular nature of GBICs allows network administrators to adapt their network infrastructure by swapping out GBICs without the need to replace entire networking devices, providing cost-effective and scalable solutions.

Question 17

What does SONET stands for?

Answer 17

Synchroneous Optical Network (SONET).

Question 18

What are the 2 fiber based multimode 10GbE?

Answer 18

10GBaseSR (LAN) and 10GBaseSW (SONET). Supports 26-300m length.

Question 19

What are the 2 fiber based 1310nm 10 GbE?

Answer 19

10GBaseLR (LAN) and 10GBaseLW (SONET). Support 10 km length.

Question 20

What are the 2 fiber based 1550nm 10 GbE?

Answer 20

10GBaseER (LAN) and 10GBaseEW (SONET). Support 40 km length.

Question 21

What device should you use to have a full duplex connection on a single fiber?

Answer 21

BiDi.