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CISCO CCNA > Chap2er 5-6 > Flashcards

Chap2er 5-6 Flashcards

Sem 2 Chap 5-6

1
Q

What does STP do

A

logically blocks physical loops in layer 2 networks

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2
Q

What is the main function of STP

A

disables redundant paths to eliminate layer 2 loops

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3
Q

Outcome of broadcast storm

A

new traffic is discarded by the switch and unable to be processed

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4
Q

Problems when turning spanning tree off

A

MAC address table becomes unstable, broadcast frames are transmitted indefinitely

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5
Q

Network features that require STP

A

redundant links between Layer 2 switches, removing single point of failure with multiple Layer 2 switches

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6
Q

3 Components of bridge ID

A

Extended sys ID (VLAN #), MAC address, bridge priority

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7
Q

T/F: A bridge priority of 1 is the lowest valid bridge priority

A

False (increments of 4096)

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8
Q

Highest possible bridge priority

A

61440

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9
Q

If switch priority is all the same, the root switch is determined by

A

lowest MAC address

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10
Q

The root port is the port closest to the

A

root switch

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11
Q

What is used to determine the root port?

A

path cost

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12
Q

In which two roles can interfaces function in the forwarding state?

A

designated, root

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13
Q

In which two port states does a switch learn MAC addresses and process BPDUs in a PVST network

A

forwarding, learning

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14
Q

What STP field has a default value of 32768

A

bridge priority

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15
Q

What field is used to specify a vlan id

A

extended system id

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16
Q

What is the reference port for all path calculations

A

root bridge

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17
Q

What is a non-root port that is permitted to forward traffic across the network

A

designated port

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18
Q

What is the closest overall port to the root bridge (in terms of cost) called

A

root port

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19
Q

Spanning tree standard that supports only one root bridge

A

802.1D

20
Q

Protocol that provides up to 16 instances of RSTP, combines many VLANs with the same phys/logi topology into common RSTP instance, and provides support for a bunch of stuff

A

MST

21
Q

The Legacy standard for STP that runs all VLANS in a single spanning-tree instance

A

STP

22
Q

Cisco enhancement of RSTP

A

Rapid PVST+

23
Q

Protocol that allows multiple VLANs in a single spanning-tree instance

A

MSTP

24
Q

Proprietary per-vlan implementation of ieee 802.1w

A

Rapid PVST+

25
Q

Cisco Implementation of IEEE 802.1D

A

PVST+

26
Q

Fast-Converging enhancement of IEEE 802.1D

A

RSTP

27
Q

IEEE Standard that reduces the number of STP instances

A

MSTP

28
Q

Standard that allows more bandwidth between a L3 switch and multiple L2 switches

A

EtherChannel

29
Q

What happens if one of three configured links in an EtherChannel link goes down

A

other two interfaces continue to load balance traffic

30
Q

Advantages of EtherChannel

A

consistency in configuration of physical links, views physical links in EtherChannel as one logical connection

31
Q

Load-balancing methods of EtherChannel

A

src-dest IP, src-dest MAC

32
Q

Reqs to be able to configure EtherChannel between two switches

A

interfaces at same speed and same duplex

33
Q

T/F: PagP is a Cisco proprietary standard

A

TRUE

34
Q

Two parameters that must match on ports of switches to create PagP EtherChannel between swtiches

A

speed, VLAN information

35
Q

Mode to allow EtherChannel link formation without negotiation

A

both on

36
Q

What happens if one EtherChannel is set to desirable but the other is set to on

A

EtherChannel link fails to establish

37
Q

If one switch EtherChannel is set to auto, what should the other switch be set to

A

desirable

38
Q

Open protocol standard that allows switches to bundle multiple ports

A

LACP

39
Q

Advantages of LACP

A

Allows directly connected switches to negotiate EtherChannel link, allows multivendor devices

40
Q

When EtherChannel is configured, what mode forces an interface into port channel without exchanging aggregation protocol packets

A

on

41
Q

Two channel group modes to place interface in negotiating state w/ PagP

A

desirable, auto

42
Q

Requirement to configure trunking EtherChannel between two switches

A

allowed VLANs must be the same

43
Q

Exhibit where there’s an EtherChannel between two switches. What’s the problem

A

allowed VLANs are different

44
Q

If a PortChannel shows PagP, what does that mean

A

it’s using a cisco proprietary protocol

45
Q

What does a D mean in etherchannel output

A

not functional

CISCO CCNA (3 decks)

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