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Cisco CCNA 2 > 3 - STP Implementation > Flashcards

3 - STP Implementation Flashcards

Ch 3

1
Q

Commands to manually configure an Etherchannel?

A
  • Int fa0/14
    • channel-group 1 mode on
  • int fa0/15
    • channel-group 1 mode on
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2
Q

What two other terms are synonymous with Etherchannel?

A

Port-channel and Channel-group

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3
Q

What two protocols does Cisco support to negotiate an Etherchannel?

A
  • Cisco-proprietary Port Aggregation Protocol (PAgP)
  • IEEE standard Link Aggregation Control Protocol (LACP)
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4
Q

What is the IEEE standard for LACP?

A

802.3ad

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5
Q

What are the two key words that enable PAgP?

A

desireable and auto

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6
Q

What are the two key words that enable LACP?

A

active and passive

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7
Q

show’ cmds to view an Etherchannel?

A
  • show etherchannel 2 port-channel
  • show etherchannel 2 summary
  • show spanning-tree vlan 3
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8
Q

What is the command to move from STP to RSTP?

A

spanning-tree mode rapid-pvst

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9
Q

What is the command to implement 802.1d STP?

A

spanning-tree mode pvst

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10
Q

What is 802.3ad?

A

The IEEE standard for LACP

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11
Q

What mode of spanning-tree is the default?

A

pvst or 802.1d

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12
Q

What ‘show’ cmds will display the version of spanning-tree

A
  • show spanning-tree vlan 10
  • show spanning-tree vlan 10 bridge
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13
Q

What ‘show’ cmd displays alternate and backup interfaces whether RSTP is running or not?

A

show spanning-tree vlan 10

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14
Q

What is the only ways to determine which version of spanning-tree is running?

A
  • You must look at the ‘spanning-tree mode’ command in the configuration.
  • show spanning-tree vlan 10 bridge
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15
Q

What does ‘spanning-tree mode mst’ do?

A

Creates multiple RSTP instances but does NOT require one instance per VLAN.

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16
Q

What is the RSTP term for Blocking?

A

Discarding

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17
Q

What will ‘show’ cmds display for a port that is Discarding?

A

Blocking

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18
Q

What ‘show’ cmd will display the STP state of an interface?

A

show spanning-tree vlan 10 interface gig0/1 state

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19
Q

What two interface conditions tells RSTP what type of port it is?

A

duplex and portfast

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20
Q

How would RSTP identify and shared port?

A

half-duplex without portfast configured

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21
Q

What type of RSTP port would be half-duplex with portfast configured

A

shared-edge

22
Q

What type of RSTP port would be full-duplex with portfast configured?

A

point-to-point edge

23
Q

What type of RSTP port would be full-duplex without portfast configured

A

point-to-point (between two switches)

24
Q

What show command will display the type of RSTP port whether RSTP is running or not?

A

show spanning-tree vlan 10 Loc: 3190

25
Q

What two versions of RSTP do Cisco switches support?

A
  • Rapid PVST
  • Multiple Spanning-tree
26
Q

What is the command to implement mst?

A

spanning-tree mode mst Loc: 3190

27
Q

What are the fields of the BID with the System Extension?

A

Priority 4-bits, System ID Extension 12-bits holding VLAN #, System ID (MAC) 6-bytes Loc: 3225

28
Q

What is the interface cmd for changing a port cost on a switch for a specific VLAN?

A

spanning-tree vlan 10 cost 30 Loc: 3382

29
Q

What show cmd will display the port cost?

A

show spanning-tree vlan 10’

30
Q

What is the cmd for changing the priority of a switch?

A

spanning-tree vlan 10 priority

31
Q

What is the cmd for making a switch to Root Bridge?

A

spanning-tree vlan 10 root primary

32
Q

What is the cmd for making a switch a backup to the Root Bridge?

A

spanning-tree vlan 10 root secondary

33
Q

If the command ‘spanning-tree vlan 10 root primary’ is used what priority value will it assign?

A

If current root base priority higher than 24576 then 24576. If lower then highest multiple of 4096 that is lower than current root. Loc: 3382

34
Q

If the command ‘spanning-tree vlan 10 root secondary’ is used what priority value will it assign?

A

28672 Loc: 3434

35
Q

What is the base priority?

A

32768 Loc: 3434

36
Q

What show command will show the local switches BID and Priority

A

show spanning-tree vlan 10 bridge Loc: 3434

37
Q

What show command will show the Root Bridge BID and Priority without having to be on the Root switch?

A

show spanning-tree vlan 10 root Loc: 3434

38
Q

What is the command to enable portfast on an interface?

A

spanning-tree portfast Loc: 3532

39
Q

What is the command to enable bpdu guard?

A

spanning-tree bpduguard enable Loc: 3532

40
Q

what is the command to enable portfast globally?

A

spanning-tree portfast default Loc: 3532

41
Q

What is the command to enable bpdu guard globally

A

spanning-tree portfast bpduguard default Loc: 3840

42
Q

What are the commands to disable bpdu guard and portfast on an interface?

A

spanning-tree portfast disable, spanning-tree bpduguard disable Loc: 3532

43
Q

What is the show command to view the global state of bpdu guard and portfast

A

show spanning-tree summary

44
Q

What is the interface cmd for changing its port cost for all VLANs on that interface?

A

spanning-tree cost 19

45
Q

When configuring Etherchannel do you need to create a Logical Port-channel Interface?

A

No.

46
Q

In RSTP how do you identify the Alternate port?

A
  • show spanning-tree vlan 10
    • then look below at port for Altn
47
Q

What 3 options can follow the ‘spanning-tree mode ‘ command?

A
  1. pvst
  2. mst
  3. rapid-pvst
48
Q

Of the 3 options that can follow the ‘spanning-tree mode’ command which two are RSTP?

A
  • rapid-pvst
  • mst
49
Q

If a port is configured as Half Duplex with portfast enabled what type of port does RSTP consider it to be?

A

Shared Edge port

50
Q

What command will change the port cost?

A
  • interface gig0/1
    • spanning-tree vlan 10 cost 16

Cisco CCNA 2 (40 decks)

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