CCNA3: Module 5

[Options with Highlight Colour are correct Answers]

1. Refer to the exhibit. Server sends an ARP request for the MAC address of its default gateway. If STP is not enabled, what will be the result of this ARP request?
Router_1 will kill the broadcast and reply with the MAC address of the next hop router.
Switch_A will reply with the MAC address of the Router_1 E0 interface.
Switch_A and Switch_B will continuously flood the message onto the network.
Switch_B will broadcast the request and reply with the Router_1 address.
The message will cycle around the network until its TTL is exceeded.

2. Which two items are true regarding the spanning-tree portfast command? (Choose two.)
If the switch port is configured with PortFast, it waits 15 seconds before transitioning from a blocking to forwarding state.
Enabling PortFast on trunks that connect to other switches improves convergence.
If a switch port is configured with PortFast, it is an access port that immediately transitions from a blocking to forwarding state.
Portfast enables the port to bypass the listening and learning states of STP.
Portfast bypasses the learning state and moves immediately into blocking.

3. Which two statements are true about the default operation of STP in a Layer 2 switched environment that has redundant connections between switches? (Choose two.)
The root switch is the switch with the highest speed ports.
Decisions on which port to block when two ports have equal cost depend on the port priority and identity.
All trunking ports are designated and not blocked.
Root switches have all ports set as root ports.
Non-root switches each have only one root port.

4. Refer to the exhibit. Spanning-tree port priorities are listed beneath each interface. The network administrator enters the spanning-tree vlan 1 root primary command on S4. What is the effect of the command?
Port priority makes Gi0/2 on S1 a root port.
S4 is already the root bridge, so there are no port changes.
Spanning tree blocks Gi0/1 on S3 to prevent a redundant path from S1.
S2 Gi0/1 becomes a non-designated port because Gi0/2 has a lower path cost to S4.