Cisco CCNA 200-301 Questions & Answers

• Question 1281:

  Refer to the exhibit.

  

  After the switch configuration, the ping test fails between PC A and PC B. Based on the output for switch 1, which error must be corrected?

  A. The PCs are in the incorrect VLAN.

  B. All VLANs are not enabled on the trunk.

  C. Access mode is configured on the switch ports.

  D. There is a native VLAN mismatch.

  Correct Answer: D

  There is VLAN Mismatch. Remember there is no any intervlan routing on the two sitches thus minimising the chance of communication. https://www.youtube.com/watch?v=klqpX6U-_JY

• Question 1282:

  Which unified access point mode continues to serve wireless clients after losing connectivity to the Cisco Wireless LAN Controller?

  A. local

  B. mesh

  C. flexconnect

  D. sniffer

  Correct Answer: C

  In previous releases, whenever a FlexConnect access point disassociates from a controller, it moves to the standalone mode. The clients that are centrally switched are disassociated. However, the FlexConnect access point continues to serve locally switched clients. When the FlexConnect access point rejoins the controller (or a standby controller), all clients are disconnected and are authenticated again. This functionality has been enhanced and the connection between the clients and the FlexConnect access points are maintained intact and the clients experience seamless connectivity. When both the access point and the controller have the same configuration, the connection between the clients and APs is maintained.

  Reference: https://www.cisco.com/c/en/us/td/docs/wireless/controller/8-5/config-guide/b_cg85/flexconnect.html

• Question 1283:

  What is the primary effect of the spanning-tree portfast command?

  A. It immediately enables the port in the listening state.

  B. It immediately puts the port into the forwarding state when the switch is reloaded.

  C. It enabled BPDU messages.

  D. It minimizes spanning-tree convergence time.

  Correct Answer: D

  Reference: https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3560/software/release/12-2_55_se/configuration/guide/3560_scg/swstpopt.html

• Question 1284:

  Which result occurs when PortFast is enabled on an interface that is connected to another switch?

  A. Root port choice and spanning tree recalculation are accelerated when a switch link goes down.

  B. After spanning tree converges, PortFast shuts down any port that receives BPDUs.

  C. VTP is allowed to propagate VLAN configuration information from switch to switch automatically.

  D. Spanning tree may fail to detect a switching loop in the network that causes broadcast storms.

  Correct Answer: D

  Enabling the PortFast feature causes a switch or a trunk port to enter the STP forwarding-state immediately or upon a linkup event, thus bypassing the listening and learning states. Note: To enable portfast on a trunk port you need the trunk keyword “spanning-tree portfast trunk“

• Question 1285:

  Which QoS Profile is selected in the GUI when configuring a voice over WLAN deployment?

  A. Platinum

  B. Bronze

  C. Gold

  D. Silver

  Correct Answer: A

  Cisco Unified Wireless Network solution WLANs support four levels of QoS: Platinum/Voice, Gold/Video, Silver/Best Effort (default), and Bronze/Background.

  Reference: https://www.cisco.com/c/en/us/support/docs/wireless-mobility/wireless-lan-wlan/81831-qos-wlc-lap.html https://www.cisco.com/c/en/us/td/docs/wireless/controller/7-4/configuration/guides/consolidated/b_cg74_CONSOLIDATED/b_cg74_CONSOLIDATED_chapter_01010111.html

• Question 1286:

  Which action is taken by switch port enabled for PoE power classification override?

  A. If a monitored port exceeds the maximum administrative value for power, the port is shutdown and err-disabled.

  B. When a powered device begins drawing power from a PoE switch port, a syslog message is generated.

  C. As power usage on a PoE switch port is checked, data flow to the connected device is temporarily paused.

  D. If a switch determines that a device is using less than the minimum configured power, it assumes the device has failed and disconnects it.

  Correct Answer: A

  PoE monitoring and policing compares the power consumption on ports with the administrative maximum value (either a configured maximum value or the port's default value). If the power consumption on a monitored port exceeds the administrative maximum value, the following actions occur:

  -A syslog message is issued.

  -

  The monitored port is shut down and error-disabled.

  -

  The allocated power is freed.

  Reference: https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst6500/ios/12-2SX/configuration/guide/book/power_over_ethernet.pdf

• Question 1287:

  Which IPv6 address block sends packets to a group address rather than a single address?

  A. 2000::/3

  B. FC00::/7

  C. FE80::/10

  D. FF00::/8

  Correct Answer: D

• Question 1288:

  What are two reasons that cause late collisions to increment on an Ethernet interface? (Choose two.)

  A. when Carrier Sense Multiple Access/Collision Detection is used

  B. when one side of the connection is configured for half-duplex

  C. when the sending device waits 15 seconds before sending the frame again

  D. when a collision occurs after the 32nd byte of a frame has been transmitted

  E. when the cable length limits are exceeded

  Correct Answer: BE

  A late collision is defined as any collision that occurs after the first 512 bits (or 64th byte) of the frame have been transmitted. The usual possible causes are full-duplex/half-duplex mismatch, exceeded Ethernet cable length limits, or defective

  hardware such as incorrect cabling, non-compliant number of hubs in the network, or a bad NIC.

  Late collisions should never occur in a properly designed Ethernet network. They usually occur when Ethernet cables are too long or when there are too many repeaters in the network.

  Reference: https://www.cisco.com/en/US/docs/internetworking/troubleshooting/guide/tr1904.html

• Question 1289:

  What is a benefit of using a Cisco Wireless LAN Controller?

  A. It eliminates the need to configure each access point individually.

  B. Central AP management requires more complex configurations.

  C. Unique SSIDs cannot use the same authentication method.

  D. It supports autonomous and lightweight APs.

  Correct Answer: A

  A wireless LAN (or WLAN) controller is used in combination with the Lightweight Access Point Protocol (LWAPP) to "manage light-weight access points in large quantities" by the network administrator or network operations center.

• Question 1290:

  Refer to Exhibit.

  

  Which action do the switches take on the trunk link?

  A. The trunk does not form, and the ports go into an err-disabled status.

  B. The trunk forms, but the mismatched native VLANs are merged into a single broadcast domain.

  C. The trunk forms, but VLAN 99 and VLAN 999 are in a shutdown state.

  D. The trunk does not form, but VLAN 99 and VLAN 999 are allowed to traverse the link.

  Correct Answer: B

  The trunk still forms with mismatched native VLANs and the traffic can actually flow between mismatched switches. But it is absolutely necessary that the native VLANs on both ends of a trunk link match; otherwise a native VLAN mismatch occurs, causing the two VLANs to effectively merge. For example with the above configuration, SW1 would send untagged frames for VLAN 999. SW2 receives them but would think they are for VLAN 99 so we can say these two VLANs are merged.