Volume 1 - Chapter 7: Configuring and Verifying Switch Interfaces

Question 1

Describe the purpose of FLPs.

Answer 1

Fast Link Pulses (FLPs) exchange data between devices to identify what speeds and duplexes they support

Question 2

In regards to parallel detection, what is the default duplex on a switchport for a speed of 10 or 100 Mbps?

Answer 2

Half Duplex

Question 3

In regards to parallel detection, what is the default duplex on a switchport for a speed faster than 100 Mbps?

Answer 3

Full Duplex

Question 4

In regards to parallel detection, how does a switchport choose what speed to use when the PC on the other end of the link has autonegotiation disabled?

Answer 4

By sensing what type of signaling is being used

Question 5

What type of networking device does not participate in autonegotiation and use FLP messages?

Answer 5

LAN Hubs

Question 6

What is the default status of auto-MDIX on a Cisco switchport’s configuration?

Answer 6

Enabled

Question 7

What is the command to disable the use of auto-MDIX on a switchport?

Answer 7

no mdix auto

Question 8

Which 3 switchport commands are enabled by default and do not show in the running-config?

Answer 8

speed auto
duplex auto
mdix auto

Question 9

An engineer enters the command “speed 1000” on a switchport, followed by the command “no speed 1000”. What speed will the switchport be set to?

Answer 9

The default speed setting for a switchport:

speed auto

Question 10

What command can be used to show the entire running configuration, including the default commands that are not typically shown?

Answer 10

show running-config all

Question 11

What field in the command “show interface x” details the layer 1 status?

Answer 11

The Line Status

Question 12

What field in the command “show interface x” details the layer 2 status?

Answer 12

The Protocol Status

Question 13

When a switch does not receive autonegotiation FLP messages, how does it choose its speed and duplex?

Answer 13

By using autonegotiation parallel detection logic

Question 14

Describe what is indicated by the “runt” error counter on a switchport interface?

Answer 14

Frames that did not meet the minimum 64 byte size

Question 15

Describe what is indicated by the “giant” error counter on a switchport interface?

Answer 15

Frames that are larger than the maximum 1518 byte size

Question 16

Describe what is indicated by the “CRC” error counter on a switchport interface?

Answer 16

Cyclic Redundancy Check

Frames that have failed the Frame Check Sequence (FCS)

Question 17

Describe the difference between a collision and a late collision in regards to switchport errors.

Answer 17

The collisions counter includes all detected collisions.

The late collisions counter includes only collisions that occur after the 64th byte has been transmitted.

Question 18

Describe what is indicated by the “Frame” error counter on a switchport interface?

Answer 18

A frame that has a general format error

For example, an extra byte on the trailer

Question 19

What is often a cause of late collisions on a switchport?

Answer 19

A duplex mismatch

Question 20

What is often a cause of runts on a switchport?

Answer 20

A collision that has occurred