Ethernet Fundamentals

Question 1

Spanning Tree Protocol

Answer 1

IEEE 802.1D Permits redundant links so that we don’t have loop backs

Question 2

Broadcast Storms

Answer 2

Switches pass a packet back and forth forever and consume resources.

Question 3

Root Device

Answer 3

STP - The Reference point for the entire spanning tree

Question 4

BID

Answer 4

How to select Root Device in STP. BID is made up of a priority value and a MAC Address Looks for lowest value

Question 5

Root Port

Answer 5

All non-root bridges will need a root port. Closest to the root bridge in terms of cost , cost is measured by cable speed, ie CAT 5 or CAT 7 . If they are all the same then we choose the lowest port number

Question 6

Designated Ports

Answer 6

Used to transmit data

Question 7

Non-Designated Ports

Answer 7

These ports will not forward traffic But they will receive bridge protocol data units, will start to transmit if a link in the topology goes down

Question 8

Forwarding State or non-designated ports

Answer 8

Blocking, Listening, Learning, Forwarding

Question 9

VLAN Trunking

Answer 9

802.1q Multiple VLAN’s transmitted over the same physical cable

Question 10

10BASE5

Answer 10

Coax 10Mbps 500m

Question 11

10BASE2

Answer 11

Coax 10Mbps 185m

Question 12

10BASE-T

Answer 12

Cat 3 or High UTP 10 Mbps 100m

Question 13

100BASE-TX

Answer 13

CAT 5+ UTP 100mbps 100m

Question 14

100BASE-FX

Answer 14

MMF 100 Mbps 2km

Question 15

1000BASE-T

Answer 15

Cat 5e UTP 1 Gbps 100m

Question 16

1000BASE-TX

Answer 16

Cat 6 1 Gbps 100m

Question 17

1000BASE-LX

Answer 17

SMF 1 Gbps 5km

Question 18

1000BASE-SX

Answer 18

MMF 1 Gbps 550m

Question 19

1000BASE-LH

Answer 19

SMF 1 Gbps 10km

Question 20

1000BASE-ZX

Answer 20

SMF 1Gbps 70km

Question 21

10GBASE-SR

Answer 21

MMF 10 Gbps 26m - 400m

Question 22

10GBASE-LR

Answer 22

SMF 10 Gbps 10-25 km

Question 23

10GBASE-ER

Answer 23

SMF 10 Gbps 40 km

Question 24

10GBASE-SW

Answer 24

MMF 10 Gbps 300m

Question 25

10GBASE-LW

Answer 25

SMF 10Gbps 10km

Question 26

10GBASE-EW

Answer 26

SMF 10Gbps 40km

Question 27

10GBASE-T

Answer 27

Cat 6a or Cat 7 10 Gbps 100m

Question 28

100GBASE-SR10

Answer 28

MMF 100 Gbps 125 m

Question 29

100GBASE-LR4

Answer 29

SMF 100 Gbps 10 km

Question 30

100GBASE-ER4

Answer 30

SMF 100 Gbps 40km

Question 31

VTP

Answer 31

VLAN Trunking Protocol - Allows changes on one switch to propagate to other switches in the network

Question 32

802.1d

Answer 32

IEEE MAC Bridges standard