7. Configuring and Verifying Switch Interfaces

Question 1

Which of the following describes a way to disable IEEE standard autonegotiation on a
10/100 port on a Cisco switch?
a. Configure the negotiate disable interface subcommand
b. Configure the no negotiate interface subcommand
c. Configure the speed 100 interface subcommand
d. Configure the duplex half interface subcommand
e. Configure the duplex full interface subcommand
f. Configure the speed 100 and duplex full interface subcommands

Answer 1

f. Configure the speed 100 and duplex full interface subcommands

Question 2

In which of the following modes of the CLI could you configure the duplex setting for
interface Fast Ethernet 0/5?
a. User mode
b. Enable mode
c. Global configuration mode
d. VLAN mode
e. Interface configuration mode

Answer 2

e. Interface configuration mode

Question 3

A Cisco Catalyst switch connects with its Gigabit0/1 port to an end user’s PC. The end
user, thinking the user is helping, manually sets the PC’s OS to use a speed of 1000
Mbps and to use full duplex, and disables the use of autonegotiation. The switch’s
G0/1 port has default settings for speed and duplex. What speed and duplex settings
will the switch decide to use? (Choose two answers.)
a. Full duplex
b. Half duplex
c. 10 Mbps
d. 1000 Mbps

Answer 3

a. Full duplex

d. 1000 Mbps

Question 4

The output of the show interfaces status command on a 2960 switch shows interface
Fa0/1 in a “disabled” state. Which of the following is true about interface Fa0/1?
(Choose three answers.)
a. The interface is configured with the shutdown command.
b. The show interfaces fa0/1 command will list the interface with two status codes
of administratively down and line protocol down.
c. The show interfaces fa0/1 command will list the interface with two status codes
of up and down.
d. The interface cannot currently be used to forward frames.
e. The interface can currently be used to forward frames.

Answer 4

a. The interface is configured with the shutdown command.
b. The show interfaces fa0/1 command will list the interface with two status codes
of administratively down and line protocol down.
d. The interface cannot currently be used to forward frames.

Question 5

Switch SW1 uses its Gigabit 0/1 interface to connect to switch SW2’s Gigabit 0/2 interface.
SW2’s Gi0/2 interface is configured with the speed 1000 and duplex full commands.
SW1 uses all defaults for interface configuration commands on its Gi0/1 interface.
Which of the following are true about the link after it comes up? (Choose two answers.)
a. The link works at 1000 Mbps (1 Gbps).
b. SW1 attempts to run at 10 Mbps because SW2 has effectively disabled IEEE standard
autonegotiation.
c. The link runs at 1 Gbps, but SW1 uses half duplex and SW2 uses full duplex.
d. Both switches use full duplex.

Answer 5

a. The link works at 1000 Mbps (1 Gbps).

d. Both switches use full duplex.

Question 6

Switch SW1 connects via a cable to switch SW2’s G0/1 port. Which of the following
conditions is the most likely to cause SW1’s late collision counter to continue to
increment?
a. SW2’s G0/1 has been configured with a shutdown interface subcommand.
b. The two switches have been configured with different values on the speed interface
subcommand.
c. A duplex mismatch exists with SW1 set to full duplex.
d. A duplex mismatch exists with SW1 set to half duplex.

Answer 6

d. A duplex mismatch exists with SW1 set to half duplex.

Question 7

Set interface fa0/1 with speed 100, full duplex and description - “Printer”

Answer 7

interface fa0/1
speed 100
duplex full
description Printer

Question 8

What information does show interface status show you

Answer 8

Name (Description)
Status
Vlan 
Duplex 
Speed
Type (port type)

Question 9

What does interface status of notconnect mean

Answer 9

Switchport is currently not working

Cable not connected

Question 10

Set interfaces fa0/11 to fa0/20 to speed 100

Answer 10

interface range fa0/11 - 20

speed 100

Question 11

When you shut down an interface what will its status be

Answer 11

administratively down

protocol (disabled)

Question 12

How do you revert default settings for duplex, speed and description

Answer 12

no duplex
no speed
no description

Question 13

What is IEEE rules when autonegotiation fails

Answer 13

Speed: use slowest supported speed (often 10Mbps)
Duplex: if speed is 10 or 100 use half duplex else use full

Question 14

What is Cisco rules when autonegotiation fails

Answer 14

Speed: sense the speed without use of autonegotiation. If that fails use IEEE rules
Duplex: use IEEE defaults - if 10 or 100 use half duplex else full

Question 15

How can you disable autonegotiation between switches

Answer 15

Set speed and duplex on both switches

Question 16

What are the speed and settings of a switch when it is set to auto and a PC is manually set to 100 and full

Answer 16

Speed 100

Half duplex

Question 17

What are the speed and settings of a switch when it is set to auto and a PC is manually set to 1000 and full

Answer 17

Speed 1000

full duplex

Question 18

What is a duplex mismatch

Answer 18

when one side is set to half duplex and the other side is full duplex

Question 19

What are the speed and duplex settings of a switch when a hub is connected and why

Answer 19

Speed 10 and half duplex because hubs do not react to autonegotiation messages

Question 20

What does line status refer to

Answer 20

Layer 1 status

Question 21

What does protocol status refer to

Answer 21

Layer 2 status

Question 22

What does interface status of disabled mean

Answer 22

shutdown command has been configured on the interface

Question 23

What is the interface status for line status administratively down and protocol status down

Answer 23

disabled

Question 24

What are maybe some reasons for interface status of notconnect

Answer 24

No cable, bad cable
Outside interference that can make cable fail
Wrong cable pinouts
speed mismatch
Neighbor device is powered off, shutdown or err-disabled

Question 25

What does interface status of err-disabled mean

Answer 25

port security had disabled the interface

Question 26

What is the interface status when the interface is working

Answer 26

connected

Question 27

What does line status of up and protocol status of down mean

Answer 27

Not expected on LAN switch physical interfaces

Question 28

How can you tell if an interface used autonegotiation to get its speed or duplex

Answer 28

show interface status

speed or duplex will have a- in front of it

Question 29

What will a speed mismatch do

Answer 29

Cause interface to go into down/down state

Question 30

What is a Runt

Answer 30

Frames that did not meet minimum frame size requirement
< 64 bytes
Can be caused by collisions

Question 31

What is a Giant

Answer 31

frames that exceed maximum frame size requirement

> 1518 bytes

Question 32

What is Input Error

Answer 32

Total or many counters that include runts, giants, no buffer, CRC, frame, overrun and ignored counts

Question 33

What is CRC count

Answer 33

Received frames that did not pass FCS

Can be caused by collisions or other physical transmission problems

Question 34

What is a Frame count

Answer 34

Received frames that have an illegal format for example ending with a partial byte
Can be caused by collisions

Question 35

What are Output Errrors

Answer 35

Number of frames that the port tried to transmit but which a problem occurred

Question 36

What is a Late Collision

Answer 36

Count of all collisions that happen after the 64th byte of the frame has been transmitted

Question 37

Which counter can help you determine a duplex mismatch

Answer 37

Late collision

Question 38

How can you tell interference may be a problem

Answer 38

CRC errors grow but collisions do not

Question 39

What does show interfaces description show

Answer 39

Status, protocol and description