Monday, October 10, 2016

CCNAv3 Chapter 3.2 Quiz Answers (100%)

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Below is the Chapter 3.2 Quiz for CCNA 3, hand-crafted by yours truly. 

We have included the tutorial/explanations from the quiz page to help describe each response. Most answer pages don't ever have a tutorial section-- this is the least we could do.



To view the answers to this quiz, click the following link if you have not done so already.

Section 3.2 Quiz: EtherChannel

Question 1
Which statement describes a characteristic of an EtherChannel link?

  •   The EtherChannel link only works between switch devices.
  •   It can be configured for trunk or access mode.****
  •   It is used for load balancing, but not for link redundancy.
  •   The PAgP protocol should be used if the link involves devices from multiple vendors.



Missed this question? See below for some assistance!
Refer to curriculum topic: 3.1.2
Because of rising demands for performance and fault tolerance, many servers now support link aggregation with EtherChannel. In such applications, an EthernChannel is created between a switch and an EtherChannel-enabled server and the EtherChannel mode is access. An EtherChannel link can provide both load balancing and link redundancy. PAgP is a Cisco-proprietary protocol and it is used to create and manage EtherChannel links among Cisco devices.



Question 2


(image from the quiz question page)
Refer to the exhibit. A network administrator is configuring an EtherChannel link between two switches, SW1 and SW2. Which statement describes the effect after the commands are issued on SW1 and SW2?

  •   The EtherChannel fails to establish.**** 
  •   The EtherChannel is established without negotiation.
  •   The EtherChannel is established after SW1 initiates the link request.
  •   The EtherChannel is established after SW2 initiates the link request.



Missed this question? See below for some assistance!
Refer to curriculum topic: 3.1.2
The interfaces GigabitEthernet 0/1 and GigabitEthernet 0/2 are configured "on" for the EtherChannel link. This mode forces the interface to channel without PAgP or LACP. The EtherChannel will be established only if the other side is also set to "on". However, the mode on SW2 side is set to PAgP desirable. Thus the EtherChannel link will not be established.



Question 3

Fill in the blank. Do not abbreviate.
The command:
SWITCH(CONFIG-IF-RANGE)#_________ 1 MODE ACTIVE 
creates an interface port channel 1 on a switch.

  • The missing part of the command is: "channel-group"****



Missed this question? See below for some assistance!
Refer to the IOS Command Sheet or the Chapter 3 Notes
Both the notes and the command sheet cover this command to some degree. There's not much else to say other than "channel-group <#> mode <mode>" is THE command to change the group. Not to insult, but at this point, this type of command should be known and memorized already.



 Question 4

Which three parameters must match, on the ports of two switches, for a PAgP Etherchannel to be created? (Choose three.)

  •   speed**** 
  •   duplex****
  •   PAgP mode 
  •   Port ID 
  •   MAC address 
  •   VLAN information****



Missed this question? See below for some assistance!
Refer to curriculum topic: 3.1.2
PAgP will automatically create EtherChannel links between two switches but the connecting ports must have the same speed, duplex, and VLAN information. The PAgP mode must be compatible but not necessarily equal. The port ID and the MAC addresses do not have to match.



Question 5

A network administrator is configuring an EtherChannel link between two physical ports on a switch. Which statement describes the result when one of the physical ports fails?

  •   The EtherChannel link fails. 
  •   An STP recalculation is needed. 
  •   The EtherChannel stops transmitting data until it is restarted.
  •   The EtherChannel continues transmitting data with reduced bandwidth.****



Missed this question? See below for some assistance!
Refer to curriculum topic: 3.1.1
An EtherChannel is seen as one logical connection. The loss of one physical link within the channel does not create a change in the topology and therefore a spanning tree recalculation is not required. When one of the member ports in the EtherChannel fails, the EtherChannel link remains functional, although its overall throughput decreases because of a lost link within the EtherChannel.



Question 6


Refer to the exhibit. A network administrator is configuring an EtherChannel link between two switches, SW1 and SW2. However, the EtherChannel link fails to establish. What change in configuration would correct the problem?

  •   Configure SW1 EtherChannel mode to on. 
  •   Configure SW2 EtherChannel mode to on. 
  •   Configure SW2 EtherChannel mode to auto. 
  •   Configure SW2 EtherChannel mode to desirable. ****



Missed this question? See below for some assistance!
Refer to curriculum topic: 3.1.2
The EtherChannel mode must be compatible on each side for the link to work. The three modes from PAgP protocol are on, desirable, and auto. The three modes from LACP protocol are on, active, and passive. The compatible modes include on-on, auto-desirable, desirable-desirable, active-passive, and active-active. Any other combinations will not form an EtherChannel link.



END OF QUIZ! Answers should be correct (or at least a 90%). Make sure to comment specifically what is incorrect or what you may have missed if you did not score correctly.

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