What are two reasons why the Ping messages that are issued from Laptop0 towards Laptop1 are failing choose two?

Last Updated on March 15, 2019 by Admin

CCNA3 v6.0 Chapter 4 Exam Answers 2018 2019 Full 100%

1. Refer to the exhibit. Which switching technology would allow each access layer switch link to be aggregated to provide more bandwidth between each Layer 2 switch and the Layer 3 switch?

   

   CCNA3 v6.0 Chapter 4 Exam 007

   Explanation: PortFast is used to reduce the amount of time that a port spends going through the spanning-tree algorithm, so that devices can start sending data sooner. Trunking can be implemented in conjunction with EtherChannel, but trunking alone does not aggregate switch links. HSRP is used to load-balance traffic across two different connections to Layer 3 devices for default gateway redundancy. HSRP does not aggregate links at either Layer 2 or Layer 3 as EtherChannel does.

2. Which statement is true regarding the use of PAgP to create EtherChannels?

   Explanation: PAgP is used to automatically aggregate multiple ports into an EtherChannel bundle, but it only works between Cisco devices. LACP can be used for the same purpose between Cisco and non-Cisco devices. PAgP must have the same duplex mode at both ends and can use two ports or more. The number of ports depends on the switch platform or module. An EtherChannel aggregated link is seen as one port by the spanning-tree algorithm.

3. Which two protocols are used to implement EtherChannel? (Choose two.)

   Explanation: Port Aggregation Protocol and Link Aggregation Control Protocol are used to implement EtherChannel. Spanning Tree and Rapid Spanning Tree Protocol are used to prevent switching loops. Cisco Discovery Protocol is Cisco-proprietary and is used to discovery information about adjacent Cisco devices such as model number and IP address.

4. Which statement describes a characteristic of EtherChannel?

   Explanation: An EtherChannel is formed by combining multiple (same type) Ethernet physical links so they are seen and configured as one logical link. It provides an aggregated link between two switches. Currently each EtherChannel can consist of up to eight compatibly configured Ethernet ports.

5. Which statement describes an EtherChannel implementation?

   Explanation: Up to 16 links can be grouped in an EtherChannel by using the the PAgP or LACP protocol. EtherChannel can be configured as a Layer 2 bundle or a Layer 3 bundle. Configuring a Layer 3 bundle is beyond the scope of this course. If a trunked port is a part of the EtherChannel bundle, all ports in the bundle need to be trunk ports and the native VLAN must be the same on all of these ports. A best practice is to apply the configuration to the port channel interface. The configuration is then automatically applied to the individual ports.

6. An EtherChannel link using LACP was formed between two switches, S1 and S2. While verifying the configuration, which mode combination could be utilized on both switches?​

   Explanation: An EtherChannel link will be formed using LACP when both switches are in on mode or in active mode, or when one of them is in passive mode and the other is in active mode.

7. What is an advantage of using LACP?

8. What is a best practice to use before beginning an EtherChannel implementation?

   Explanation: Before configuring EtherChannel, the interfaces used should be shut down so that any incomplete configuration will not cause activity on the link.

9. Which PAgP mode combination will establish an EtherChannel?

   Explanation: Switch 1 and switch 2 will establish an EtherChannel if both sides are set to desirable as both sides will negotiate the link. A channel can also be established if both sides are set to on, or if one side is set to auto and the other to desirable. Setting one switch to on will prevent that switch from negotiating the formation of an EtherChannel bundle.

10. Which three options must match in order to establish an EtherChannel between two directly connected switches? (Choose three.)

    Explanation: Speed and duplex settings must match for all interfaces in an EtherChannel. All interfaces in the EtherChannel must be in the same VLAN if the ports are not configured as trunks. Any ports may be used to establish an EtherChannel. Domain names and port security settings are not relevant to EtherChannel.

11. A network administrator is configuring an EtherChannel link between switches SW1 and SW2 by using the command SW1(config-if-range)# channel-group 1 mode passive. Which command must be used on SW2 to enable this EtherChannel?

    Explanation: The possible combinations to establish an EtherChannel between SW1 and SW2 using LACP or PAgP are as follows: PAgP on on auto desirable desirable desirable