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ICND-1 > 7 - Switches > Flashcards

7 - Switches Flashcards

1
Q

What protocol is used to prevent loops on a switch?

A

STP or spanning tree protocol

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2
Q

What are the names of the led lights on a switch?

A 
Syst or system
rps or redundant power system
stat or port status
duplx or duplex
speed
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3
Q

What are the switching modes?

A

store and forward switching
cut through switching
adaptive cut through switching
fragment free switching

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4
Q

What switching mode receives the entire frame before forwarding the frame? It also verify that no CRC errors are present.

A

Store and forward switching mode

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5
Q

What switching mode begins forwarding a frame after the first six bytes forwarding the frame before its fully received?

A

cut through switching mode

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6
Q

What switching mode provides a balance between store and forward switching and cut through switching?

A

adaptive cut through switching mode

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7
Q

What switching mode has to receive 64 bytes of the frame before deciding whether to forward the frame?

A

fragment free switching mode

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8
Q

What standard allows compliant devices to automatically communicate port speed and duplex over a 10Mb or 100Mb connection?

A

IEEE 802.3u

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9
Q

What standard allows compliant devices to automatically communicate port speed and duplex over a 1000Mb connection?

A

IEEE 802.3z

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10
Q

What is displayed in the show interfaces command?

A 
status of interfaces
ip addresses
interface speeds
number of packets sent and received
error counts
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11
Q

What is a cause of excessive noise?

A

usually a physical media problem, bad cable

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12
Q

How do you detect excessive noise errors?

A

show interfaces:
high number of CRC errors
low number of collisions

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13
Q

What is a cause of too many collisions?

A

too many nodes on a segment
bad nic
duplex mismatch

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14
Q

How do you detect collision errors?

A

show interfaces:

high number of collisions

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15
Q

What is a symptom of late collision errors?

A

duplex mismatch

network segment is too long

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16
Q

How do you detect late collision errors?

A

show interfaces:

high number of late collisions

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17
Q

What is a symptom of duplex mismatch errors?

A

intermittent connectivity

performance problems

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18
Q

How do you detect duplex mismatch errors?

A

show interfaces:
high number of collisions
high number of late collisions

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19
Q

What is a symptom of speed mismatch errors?

A

prevents the interface from sending traffic

20
Q

How do you detect speed mismatch errors?

A

show interfaces status:
check the speed setting
also the interface is usually down

21
Q

What is a symptom of a broadcast storm?

A

network slowness
cpu utilization is high on switch and computers
loop in the network

22
Q

How do you view the cpu usage on a switch?

A

show processes command

23
Q

How do you detect broadcast storm errors?

A

show interfaces:
high collision count
show processes:
high cpu usage 80 - 100%

24
Q

What methods can be used to secure a switch?

A

disable unused ports

configure port security

25
Q

What is the default mac address count when port security is enabled?

A

one mac address

26
Q

Where are the mac addresses stored when the sticky keyword is used in switchport port-security mac-address sticky?

A

in the running config, they will be lost unless the config is writ memed

27
Q

What are the three keywords available for switchport port-security violation command?

A 
restrict
protect
shutdown (default)
28
Q

What does the restrict keyword do in switchport port-security violation restrict?

A

configures the switch to drop traffic from any mac that is not allowed, create a log entry documenting the violation

29
Q

What does the protect keyword do in switchport port-security violation protect?

A

configures the switch to drop traffic from any mac that is not allowed, does not create a log entry documenting the violation

30
Q

What is the command to configure automatic error-disabled recovery?

A

errdisable recovery interval 100

31
Q

What command can be used to view port-security configuration?

A

show port-security

32
Q

What standard is STP based off of?

A

IEEE 802.1D

33
Q

What layer of the OSI model does spanning tree operate on?

A

layer 2

34
Q

What are the states of STP?

A

forwarding

blocking

35
Q

What is PortFast in STP?

A

feature that provides immediate access to the network for edge ports

36
Q

What are the global configuration commands for portfast?

A

spanning-tree portfast

spanning-tree portfast interface fa0/1

37
Q

What is BPDU Guard?

A

used to disable ports that erroneously receive BPDUs.

38
Q

Where should BPDU guard be used?

A

on edge ports that have portfast enabled

39
Q

What is loop guard?

A

feature that prevents nondesignated ports from inadvertently forming bridging loops if the steady flow of BPDUs is interrupted

40
Q

What is the global configuration command for loop guard?

A

spanning-tree loopgaurd default

41
Q

What is the interface command for loop guard?

A

spanning-tree guard loop

42
Q

What is root guard?

A

is used to prevent newly introduced switches from being elected as the new root switch

43
Q

What is the global configuration command for root guard?

A

None, it is only configured on the interface

44
Q

What is the interface command for root guard?

A

spanning-tree guard root

45
Q

What happens when root guard is enabled on port that has loop guard enabled?

A

loop guard will be disabled

ICND-1 (12 decks)

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