Chapter 2 Review Test

Which LAN switch method runs a CRC on every frame?
Cut-through
 Store and Forward
 FragmentCheck
 FragmentFree
Which LAN switch type only checks the hardware address before forwarding a frame?
Cut-through
 Store and Forward
 FragmentCheck
 FragmentFree
What is true regarding the STP blocked state of a port? (Choose all that apply)
No frames are transmitted or received on the block port.
 BPDUs are sent and received on the blocked port.
 BPDUs are still received on the blocked port.
 Frames are sent or received on the blocked port.
Layer-2 provides which of the following?
Hardware-based bridging (MAC)
 Wire speed
 High latency
 High cost
What is used to determine the root bridge in a network?
(Choose all that apply.)
Priority
 Cost of the links attached to the switch
 MAC address
 IP address
What is used to determine the designated port on a bridge?
Priority
 Cost of the links attached to the switch
 MAC address
 IP address
What are the four port states of an STP switch?
Learning
 Learned
 Listened
 Heard
 Listening
 Forwarding
 Forwarded
 Blocking
 Gathering
What are the three distinct functions of layer-2 switching?
Address Learning
 Routing
 Forwarding and filtering
 Creating network loops
 Loop avoidance
 IP addressing
What is true regarding BPDUs?
They are used to send configuration messages using IP packets.
 They are used to send configuration messages using multicast frames.
 They are used to set the cost of STP links.
 They are used to set the bridge ID of a switch.
If a switch determines that a blocked port should now be the designated port, what state will the port go into?
Unblocked
 Forwarding
 Listening
 Listened
 Learning
 Learned
What is the difference between a bridge and a layer-2 switch?
(Choose all that apply.)
Bridges can only have one spanning-tree instance per bridge.
 Switches can have many different spanning-tree instances per switch.
 Bridges can have many spanning-tree instances per bridge.
 Switches can only have one spanning-tree instance per switch.
What is the difference between a bridge and a layer-2 switch?
(Choose all that apply.)
Switches are software based.
 Bridges are hardware based.
 Switches are hardware based.
 Bridges are software based.
What does a switch do when a frame is received on an interface and the destination hardware address is unknown or not in the filter table?
Forwards the switch to the first available link.
 Drops the frame.
 Floods the network with the frame looking for the device.
 Sends a message back to the originating station asking for a name resolution.
Which LAN switch type waits for the collision window to pass before looking up the destination hardware address in the MAC filter table and forwarding the frame?
Cut-through
 Store and forward
 FragmentCheck
 FragmentFree
What is the default LAN switch type on a 1900 switch?
Cut-through
 Store and forward
 FragmentCheck
 FragmentFree
How is the bridge ID of a switch communicated to neighboring switches?
IP Routing
 STP
 During the four STP states of a switch.
 Bridge Protocol Data Units
 Broadcasts during convergence times.
How is the root port on a switch determined?
The switch determines the highest cost of a link to the root bridge.
 The switch determines the lowest cost of a link to the root bridge.
 The fastest BPDU transfer rate is determined by sending and receiving BPDUs between switches, and that interface becomes the root port.
 The root bridge will broadcast the bridge ID, and the receiving bridge will determine what interface this broadcast was received on and make this interface the root port.
How many root bridges are allowed in a network?
10
 1
 One for each switch
 20
What could happen on a network if no loop avoidance schemes are put in place?
Faster convergence times
 Broadcast storms
 Multiple frame copies
 IP routing will cause flapping on a serial link.
What is the default priority of STP on a switch?
32,768
 3276
 100
 10
 1
Your score is out of a 100.