CCNA 3 - Spanning Tree Protocol Review

Which two network design features require STP to ensure correct network operation?

• static default routes

• implementing links between Layer 2 switches

• link-state dynamic routing that provides redundant routes

• removing single points of failure with multiple Layer 2 switches

Which of the following is an outcome of a Layer 2 broadcast storm?

• Routers will take over the forwarding of frames as switches become congested.

• New traffic is discarded by the switch because it is unable to be processed.

• CSMA/CD will cause each host to continue transmitting frames.

• ARP broadcast requests are returned to the transmitting host.

What purpose does the Spanning Tree Protocol serve?

• prevents Layer 2 loops

• prevents routing loops on a router

• creates smaller collision domains

• creates smaller broadcast domains

• allows Cisco devices to exchange routing table updates

Which of the following is an accurate statement about Layer 2 loops?

• Broadcast frames are forwarded back to the sending switch

• The Time-to-Live attribute of a frame is set to infinity

• Routers continually forwarded packets to other routers

• A switch is continually forwarding the same unicast frame

What additional information is contained in the 12-bit extended system ID of a BPDU?

• MAC address

• VLAN ID

• IP address

• port ID

Which three components are combined to form a bridge ID?

• port ID

• IP address

• extended system ID

• MAC address

• bridge priority

Which 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?

• STP

• Rapid PVST+

• PVST+

• MST

Which Cisco switch feature ensures the configured switch edge ports do not cause Layer 2 loops if a port is mistakenly connected to another switch?

• BPDU guard

• extended system ID

• PortFast

• PVST+

Which of the following spanning tree protocols can cause suboptimal traffic flows because they assume only one STP instance for the entire bridged network?

• STP

• Rapid PVST+

• MSTP

• RSTP

• PVST+

Which STP standard supports only one root bridge so that traffic from all VLANs flow over the same path?

• Rapid PVST

• 802.1D

• MST

• PVST+