Volume 2 - Chapter 18: LAN Architecture

Question 1

At what level in a tier-3 LAN would you expect the following features to reside:
* DHCP Snooping
* PoE
* QoS Trust Boundry

Answer 1

The access layer

Question 2

At what level in a tier-3 LAN would you expect the following features to reside:
* Dynamic Routing Protocols
* Inter-VLAN routing
* ACL filtering

Answer 2

The distribution layer

Question 3

In a 2-tier campus LAN design, the connections between the distribution and access layers provide a ____ mesh.

Answer 3

Partial

Question 4

A 2-tier network is sometimes also refered to as a ___ ____

Answer 4

Collapsed Core Design.

Question 5

Describe the purpose of the additional core layer in a 3-tier network.

Answer 5

To connect together the distribution switches, without having to connect all distribution switches directly together.

Core switches also provide a backplane for higher traffic volume due to their faster speeds

Question 6

What type of mesh network is typically used in a 2-tier or 3-tier network?

Answer 6

A partial mesh. This is done to reduce the number of uplinks that are required.

Question 7

A network design that utilizes different features from different topologies is refered to as?

Answer 7

A hybrid topology

Question 8

What is the max speed supported on a CAT 3 cable @ 100 meters?

Answer 8

10 Mbps

Question 9

What is the max speed supported on a CAT 5 cable @ 100 meters?

Answer 9

100 Mbps

Question 10

What is the max speed supported on a CAT 5e cable @ 100 meters?

Answer 10

CAT 5e originally only had support for 1 Gbps, but was improved by the IEEE using a different standard to have support for multigig (1 Gbps, and 2.5/5 Gbps)

Question 11

What is the max speed supported on a CAT 6 cable @ 100 meters?

Answer 11

1 Gbps

However, CAT 6 does support 10 Gbps at 55 meters

Question 12

What is the max speed supported on a CAT 6A cable @ 100 meters?

Answer 12

10 Gbps

Question 13

What is the max speed supported on a CAT 8 cable @ 100 meters?

Answer 13

40 Gbps

Question 14

The term OM stands for?

Answer 14

Optical Multimode

Question 15

What are the speed and core cladding specs for a OM1 cable?

Answer 15

• Core/Cladding Diameter: 62.5/125
• 1 Gbps up to 220 meters
• 10 Gbps up to 33 meters

Question 16

What are the speed and core cladding specs for a OM3 cable?

Answer 16

• Core/Cladding Diameter: 50/125
• 10 Gbps up to 300 m

Question 16

What are the speed and core cladding specs for a OM2 cable?

Answer 16

• Core/Cladding Diameter: 50/125
• 1 Gbps up to 550 meters
• 10 Gbps up to 82 meters

Question 17

What are the speed and core cladding specs for a OM4 cable?

Answer 17

• Core/Cladding Diameter: 50/125
• 10 Gbps up to 400 m

Question 18

A device (such as a switch), that provides DC power over an Ethernet UTP cable is refered to as?

Answer 18

Power Sourcing Equipment (PSE)

Question 19

How does Power Sourcing Equipment determine if the end device that is connected supports PoE?

Answer 19

Using power detection; the PSE will send small amount of current to the end device.
* If the end device completes the circuit, it supports PoE
* If the end device doesn’t complete the circuit, it does not support PoE and is not a PD

Question 20

In regards to PoE, describe the function of power classification.

Answer 20

Determining how much power the PSE can safely provide to the PD

Question 21

An end device that supports power using PoE is refered to as?

Answer 21

A Powered Device (PD).

Question 22

Describe the function of Layer 1 power classification.

Answer 22

Layer 1 power classification is used to supply a small power set to the end device to allow it to boot a simple OS. If successful, the PSE and PD can move onto Layer 2 power classification

Question 23

Describe the function of Layer 2 power classification.

Answer 23

Used after the Layer 1 classification is complete. The PD and PSE will negotiate the proper PoE requirements using CDP and LLDP messages.

Question 24

Out of the 4 classes of PoE, which classes utilize 2 wire pairs for power?

Answer 24

PoE & PoE+

Question 25

Out of the 4 classes of PoE, which classes utilize 4 wire pairs for power?

Answer 25

UPoE & UPoE+

Question 26

What is the supported wattage and power class of PoE?

Answer 26

15 watts, power class 0

Question 27

What is the supported wattage and power class of PoE+?

Answer 27

30 watts, power class 4

Question 28

What is the supported wattage and power class of UPoE?

Answer 28

60 watts, power class 6

Question 29

What is the supported wattage and power class of UPoE+?

Answer 29

90 watts, power class 8