Chapter 2 - Cabling and Topology

Question 1

Which topologies requires termination?

Answer 1

Bus.

Question 2

The Star-Bus is an example of a ____ topology.

Answer 2

Hybrid topology.

Question 3

Of the topologies listed, which one is the most fault tolerant. Point-to-point, Bus, Star, Ring.

Answer 3

Star topology is the most fault tolerant because of its redundancy.

Question 4

What term is used to describe the interconnectivity of network components?

Answer 4

Topology.

Question 5

Coaxial cables have a ____ rating.

Answer 5

Ohm rating.

Question 6

Name the 3 types of coaxial cable.

Answer 6

RG-58 for networking (50 ohm rating and BNC connectors), RG-59 and RG-6 for cable TV (75 ohm rating and F-Type connectors).

Question 7

Which topology connected nodes with a ring of cable?

Answer 7

Ring topology.

Question 8

Which network topology is most commonly seen in wireless networks?

Answer 8

Mesh topology.

Question 9

Which type of fibers connectors are duplex?

Answer 9

LC and MT-RJ.

Question 10

Which type of fiber connectors are simplex (half duplex)?

Answer 10

ST and SC.

Question 11

What is the most common type of UTP used in new cabling installation?

Answer 11

Cat 6. Cat6a and Cat7 are also gaining in popularity.

Question 12

What are the 5 topologies?

Answer 12

Bus, Ring, Star, Hybrid, Mesh (partially or fully meshed).

Question 13

What are the 2 types of coaxial connectors?

Answer 13

BNC and F-Type.

Question 14

What is the difference between UTP and STP?

Answer 14

In STP, each pair of wires is shielded with foil. Different version of UTP and STP exist where an outer shielding made out of foil or braid screen protects the entire cable from EMI.

Question 15

What are the specifications of Cat 4 cabling?

Answer 15

20 MHz, 20 Mbps.

Question 16

What are the specification of Cat 5 cabling?

Answer 16

100 MHz, 100 Mbps.

Question 17

What are the specification of Cat 5a cabling?

Answer 17

100 MHz, 1 Gbps.

Question 18

What are the specification of Cat 3 cabling?

Answer 18

16 MHz, 16 Mbps.

Question 19

What are the specification of Cat 6 cabling?

Answer 19

250 MHz, 10 Gbps. Limited to 55 m for maximal speed.

Question 20

What are the specification of Cat 6a cabling?

Answer 20

500 MHz, 10 Gbps. Limited to 100 m for maximal speed.

Question 21

What are the specification of Cat 7 cabling.

Answer 21

600 MHz, 10+ Gbps.

Question 22

What is a RJ-11 connector?

Answer 22

A RJ-11 connector is a registered jack. It support phone landline. It is composed of 2 UTP.

Question 23

What is a RJ-45 connector?

Answer 23

It’s the name commonly used for 8P8C (8 position 8 contact) connector. It is incorrect to call a 8P8C connector a RJ-45, but this is the langage everyone uses.

Question 24

What wavelenght does multimode fiber uses?

Answer 24

850 nm. It’commonly emited from diodes.

Question 25

What wavelenght does singlemode fiber uses?

Answer 25

Either 1310 nm or 1550 nm. Monomode is used over longer distance where dispertion and modal interference are significant and multimode is not an option.

Question 26

What is the official name for the serial port?

Answer 26

DB-9. It supports a maximal speed of 56 kbps.

Question 27

What is the official name for the parrallel connector?

Answer 27

DB-25. It supports a maximal speed of 2 Mbps.

Question 28

Why should we consider fire ration when choosing UTP cabling?

Answer 28

While insulent do not burn anymore, they emit fumes. For plenum cabling, you should use plenum fire rated cable.

Question 29

What is IEEE 802?

Answer 29

It is the commitee that oversees the networking stantards. It was created on February 1980. It is split in multiple subcommitee :

802.1 Higher Layer LAN Protocols
802.3 Ethernet
802.11 WLAN
802.15 WPAN
802.18 Radio Regulatory TAG
802.19 Wireless Coexistance Wireless Group
802.20 Mobile Broadband Wireless Access (MBWA)
802.21 Media Independant Handover Service
802.22 Wireless Regional Area Network