When a Switch-port is configured with Ether-Channel with PAgP or LACP the system will negotiate to make the port become active. When configuring the Ether-Channel on the ON mode for both sides, no negotiation will occur (Ports configured on the ON mode will not exchange PAgP packets). However the EtherChannel ON mode can be used to manually configure an Ether Channel without negotiations. The auto and desirable mode are used to start negotiations. For more information refer to: { http://www.cisco.com/c/en/us/td/docs/switches/metro/me3400/software/release/12-225ex/configuration/guide/3400scg/swethchl.html }- - - - - - - - - - - -From the same document just referenced: "A port in the auto mode cannot form an EtherChannel with another port that is also in the auto mode because neither port starts PAgP negotiation." -and- "A port in the passive mode cannot form an EtherChannel with another port that is also in the passive mode because neither port starts LACP negotiation." - - - - - HOWEVER, both PAgp/ desirable, and LACP/active "Places a port into an active negotiating state in which the port starts negotiations with other ports by sending PAgP or LACP packets." Show During the implementation of Spanning Tree Protocol, all switches are rebooted by the network administrator. What is the first step of the spanning-tree election process?
Correct Incorrect Question 3 of 55 3. Question1 pointsWhich STP port role is adopted by a switch port if there is no other port with a lower cost to the root bridge?
Correct Incorrect Question 4 of 55 4. Question1 pointsWhich two concepts relate to a switch port that is intended to have only end devices attached and intended never to be used to connect to another switch? (Choose two.)
Correct Incorrect Question 5 of 55 5. Question1 pointsWhich three components are combined to form a bridge ID?
Correct Incorrect HintThe three components that are combined to form a bridge ID are bridge priority, extended system ID, and MAC address.Question 6 of 55 6. Question1 pointsIn which two port states does a switch learn MAC addresses and process BPDUs in a PVST network? (Choose two.)
Correct Incorrect HintSwitches learn MAC addresses at the learning and forwarding port states. They receive and process BPDUs at the blocking, listening, learning, and forwarding port states.Question 7 of 55 7. Question1 pointsIf no bridge priority is configured in PVST, which criteria is considered when electing the root bridge?
Correct Incorrect HintOnly one switch can be the root bridge for a VLAN. The root bridge is the switch with the lowest BID. The BID is determined by priority and the MAC address. If no priority is configured then all switches use the default priority and the election of the root bridge will be based on the lowest MAC address.Question 8 of 55 8. Question1 pointsWhen the show spanning-tree vlan 33 command is issued on a switch, three ports are shown in the forwarding state. In which two port roles could these interfaces function while in the forwarding state? (Choose two.)
Correct Incorrect HintThe role of each of the three ports will be either designated port or root port. Ports in the disabled state are administratively disabled. Ports in the blocking state are alternate ports.Question 9 of 55 9. Question1 pointsWhat is the function of STP in a scalable network?
Correct Incorrect Question 10 of 55 10. Question1 pointsWhat is a characteristic of spanning tree?
Correct Incorrect Question 11 of 55 11. Question1 pointsWhich spanning tree standard supports only one root bridge so that traffic from all VLANs flows over the same path?
Correct Incorrect HintMST is the Cisco implementation of MSTP, an IEEE standard protocol that provides up to 16 instances of RSTP. PVST+ provides a separate 802.1D spanning-tree instance for each VLAN that is configured in the network. 802.1D is the original STP standard defined by the IEEE and allows for only one root bridge for all VLANs. 802.1w, or RSTP, provides faster convergence but still uses only one STP instance for all VLANs.Question 12 of 55 12. Question1 pointsWhat is the purpose of the Spanning Tree Protocol (STP)?
Correct Incorrect Question 13 of 55 13. Question1 pointsWhat is the value used to determine which port on a non-root bridge will become a root port in a STP network?
Correct Incorrect Question 14 of 55 14. Question1 pointsRefer to the exhibit. Which switch will be the root bridge after the election process is complete?
Correct Incorrect HintThe root bridge is determined by the lowest bridge ID, which consists of the priority value and the MAC address. Because the priority values of all of the switches are identical, the MAC address is used to determine the root bridge. Because S2 has the lowest MAC address, S2 becomes the root bridge.Question 15 of 55 15. Question1 pointsWhat are two drawbacks to turning spanning tree off and having multiple paths through the Layer 2 switch network? (Choose two.)
Correct Incorrect HintSpanning tree should never be disabled. Without it, the MAC address table becomes unstable, broadcast storms can render network clients and the switches unusable, and multiple copies of unicast frames can be delivered to the end devices.Question 16 of 55 16. Question1 pointsA small company network has six interconnected Layer 2 switches. Currently all switches are using the default bridge priority value. Which value can be used to configure the bridge priority of one of the switches to ensure that it becomes the root bridge in this design?
Correct Incorrect HintThe default bridge priority value for all Cisco switches is 32768. The range is 0 to 61440 in increments of 4096. Thus, the values 1 and 34816 are invalid. Configuring one switch with the lower value of 28672 (and leaving the bridge priority value of all other switches unchanged) will make the switch become the root bridge.Question 17 of 55 17. Question1 pointsRefer to the exhibit. The administrator tried to create an EtherChannel between S1 and the other two switches via the commands that are shown, but was unsuccessful. What is the problem?
Correct Incorrect Question 18 of 55 18. Question1 pointsWhich statement is true regarding the use of PAgP to create EtherChannels?
Correct Incorrect HintPAgP 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.Question 19 of 55 19. Question1 pointsWhat are two requirements to be able to configure an EtherChannel between two switches? (Choose two.)
Correct Incorrect HintAll interfaces in the EtherChannel bundle must be assigned to the same VLAN or be configured as a trunk. If the allowed range of VLANs is not the same, the interfaces do not form an EtherChannel even when set to auto or desirable mode.Question 20 of 55 20. Question1 pointsRefer to the exhibit. On the basis of the output that is shown, what can be determined about the EtherChannel bundle?
Correct Incorrect HintTwo protocols can be used to send negotiation frames that are used to try to establish an EtherChannel link: PAgP and LACP. PAgP is Cisco proprietary, and LACP adheres to the industry standard.Question 21 of 55 21. Question1 pointsWhich two parameters must match on the ports of two switches to create a PAgP EtherChannel between the switches? (Choose two.)
Correct Incorrect HintFor an EtherChannel to be created, the ports that are concerned on the two switches must match in terms of the 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 22 of 55 22. Question1 pointsRefer 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?
Correct Incorrect Question 23 of 55 23. Question1 pointsRefer 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?
Correct Incorrect HintThe 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.Question 24 of 55 24. Question1 pointsnetwork administrator configured an EtherChannel link with three interfaces between two switches. What is the result if one of the three interfaces is down?
Correct Incorrect HintEtherChannel creates an aggregation that is seen as one logical link. It provides redundancy because the overall link is one logical connection. The loss of one physical link within the channel does not create a change in the topology; the EtherChannel remains functional.Question 25 of 55 25. Question1 pointsA network administrator is configuring an EtherChannel link between switches SW1 and SW2 by using the command SW1(config-if-range)# channel-group 1 mode auto . Which command must be used on SW2 to enable this EtherChannel?
Correct Incorrect HintThe possible combinations to establish an EtherChannel between SW1 and SW2 using LACP or PAgP are as follows: PAgP on on auto desirable desirable desirable LACP on on active active passive active The EtherChannel mode chosen on each side of the EtherChannel must be compatible in order to enable it.Question 26 of 55 26. Question1 pointsWhich technology is an open protocol standard that allows switches to automatically bundle physical ports into a single logical link?
Correct Incorrect HintLACP, or Link Aggregation Control Protocol, is defined by IEEE 802.3ad and is an open standard protocol. LACP allows switches to automatically bundle switch ports into a single logical link to increase bandwidth. PAgP, or Port Aggregation Protocol, performs a similar function, but it is a Cisco proprietary protocol. DTP is Dynamic Trunking Protocol and is used to automatically and dynamically build trunks between switches. Multilink PPP is used to load-balance PPP traffic across multiple serial interfaces.Question 27 of 55 27. Question1 pointsWhat is a requirement to configure a trunking EtherChannel between two switches?
Correct Incorrect HintTo enable a trunking EtherChannel successfully, the range of VLANs allowed on all the interfaces must match; otherwise, the EtherChannel cannot be formed. The interfaces involved in an EtherChannel do not have to be physically contiguous, or on the same module. Because the EtherChannel is a trunking one, participating interfaces are configured as trunk mode, not access mode.Question 28 of 55 28. Question1 pointsWhat are two advantages of using LACP? (Choose two.)
Correct Incorrect HintThe Link Aggregation Control Protocol (LACP) allows directly connected multivendor switches to negotiate an EtherChannel link. LACP helps create the EtherChannel link by detecting the configuration of each side and making sure that they are compatible so that the EtherChannel link can be enabled when needed.Question 29 of 55 29. Question1 pointsA switch is configured to run STP. What term describes a non-root port that is permitted to forward traffic on the network?
Correct Incorrect Question 30 of 55 30. Question1 pointsWhat are two advantages of EtherChannel? (Choose two.)
Correct Incorrect HintEtherChannel configuration of one logical interface ensures configuration consistency across the physical links in the EtherChannel. The EtherChannel provides increased bandwidth using existing switch ports without requiring any upgrades to the physical interfaces. Load balancing methods are implemented between links that are part of the same Etherchannel. Because EtherChannel views the bundled physical links as one logical connection, spanning tree recalculation is not required if one of the bundled physical links fail. If a physical interface fails, STP cannot transition the failed interface into a forwarding state.Question 31 of 55 31. Question1 pointsRefer to the exhibit. What are the possible port roles for ports A, B, C, and D in this RSTP-enabled network?
Correct Incorrect HintBecause S1 is the root bridge, B is a designated port, and C and D root ports. RSTP supports a new port type, alternate port in discarding state, that can be port A in this scenario.Question 32 of 55 32. Question1 pointsRefer 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?
Correct Incorrect HintPortFast 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.Question 33 of 55 33. Question1 pointsRefer to the exhibit. An administrator wants to form an EtherChannel between the two switches by using the Port Aggregation Protocol. If switch S1 is configured to be in auto mode, which mode should be configured on S2 to form the EtherChannel?
Correct Incorrect HintAn EtherChannel will be formed via PAgP when both switches are in on mode or when one of them is in auto or desirable mode and the other is in desirable mode.Question 34 of 55 34. Question1 pointsOpen the PT Activity. Perform the tasks in the activity instructions and then answer the question. Which set of configuration commands issued on SW1 will successfully complete the EtherChannel link between SW1 and SW2?
Correct Incorrect HintIssuing the show running-configuration command on SW1 shows that interface GigabitEthernet0/1 is missing the channel-group 1 mode desirable command which will compete the EtherChannel configuration for interface GigabitEthernet0/1 and interface GigabitEthernet0/2.Question 35 of 55 35. Question1 pointsA set of switches is being connected in a LAN topology. Which STP bridge priority value will make it least likely for the switch to be selected as the root?
Correct Incorrect Question 36 of 55 36. Question1 pointsIn which two PVST+ port states are MAC addresses learned? (Choose two.)
Correct Incorrect HintThe two PVST+ port states during which MAC addresses are learned and populate the MAC address table are the learning and the forwarding states.Question 37 of 55 37. Question1 pointsWhich port role is assigned to the switch port that has the lowest cost to reach the root bridge?
Correct Incorrect Question 38 of 55 38. Question1 pointsA switch is configured to run STP. What term describes the switch port closest, in terms of overall cost, to the root bridge
Correct Incorrect Question 39 of 55 39. Question1 pointsA switch is configured to run STP. What term describes a field used to specify a VLAN ID?
Correct Incorrect Question 40 of 55 40. Question1 pointsA switch is configured to run STP. What term describes the reference point for all path calculations?
Correct Incorrect Question 41 of 55 41. Question1 pointsA switch is configured to run STP. What term describes a field that has a default value of 32,768 and is the initial deciding factor when electing a root bridge?
Correct Incorrect Question 42 of 55 42. Question1 pointsWhich statement describes an EtherChannel implementation?
Correct Incorrect Question 43 of 55 43. Question1 pointsRefer to the exhibit. A network administrator issued the show etherchannel summary command on the switch S1. What conclusion can be drawn?
Correct Incorrect Question 44 of 55 44. Question1 pointsWhich statement describes a characteristic of EtherChannel?
Correct Incorrect Question 45 of 55 45. Question1 pointsWhich two channel group modes would place an interface in a negotiating state using PAgP? (Choose two.)
Correct Incorrect Question 46 of 55 46. Question1 pointsWhich mode configuration setting would allow formation of an EtherChannel link between switches SW1 and SW2 without sending negotiation traffic?
Correct Incorrect Question 47 of 55 47. Question1 pointsRefer to the exhibit. An EtherChannel was configured between switches S1 and S2, but the interfaces do not form an EtherChannel. What is the problem?
Correct Incorrect Question 48 of 55 48. Question1 pointsWhen EtherChannel is configured, which mode will force an interface into a port channel without exchanging aggregation protocol packets?
Correct Incorrect Question 49 of 55 49. Question1 pointsWhat are two load-balancing methods in the EtherChannel technology? (Choose two.)
Correct Incorrect Question 50 of 55 50. Question1 pointsWhich protocol provides up to 16 instances of RSTP, combines many VLANs with the same physical and logical topology into a common RSTP instance, and provides support for PortFast, BPDU guard, BPDU filter, root guard, and loop guard?
Correct Incorrect Question 51 of 55 51. Question1 pointsWhat is the outcome of a Layer 2 broadcast storm?
Correct Incorrect Question 52 of 55 52. Question1 pointsWhich two network design features require Spanning Tree Protocol (STP) to ensure correct network operation? (Choose two.)
Correct Incorrect Question 53 of 55 53. Question1 pointsA network administrator has configured an EtherChannel between two switches that are connected via four trunk links. If the physical interface for one of the trunk links changes to a down state, what happens to the EtherChannel? Which PAgP interface mode will initiate negotiation with other interfaces?On - This mode forces the interface to channel without PAgP. Interfaces configured in the on mode do not exchange PAgP packets. PAgP desirable - This PAgP mode places an interface in an active negotiating state in which the interface initiates negotiations with other interfaces by sending PAgP packets.
Which mode must be used to configure EtherChannel?You can configure an EtherChannelin one of these modes: Port Aggregation Protocol (PAgP), Link Aggregation Control Protocol (LACP), or On.
What are the modes of PAgP?There are two modes of PAgP:. Auto mode: it passively negotiates PAgP aggregation. If the remote end of the link is also configured with Auto mode, a PAgP EtherChannel will not form. ... . Desirable mode:that actively negotiates PAgP. The remote end must be configured in Auto or Desirable mode for a PAgP EtherChannel to form.. Which two commands can you use to configure an actively negotiate EtherChannel?You can configure EtherChannels manually or you can use the Port Aggregation Control Protocol (PAgP) or the Link Aggregation Control Protocol (LACP) to form EtherChannels.
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