Q. 141:
What feature allows a Cisco switch to detect and recover from unidirectional link failures?
a) UDLD
b) EtherChannel
c) LACP
d) PAgP
Answer: (a) UDLD (Unidirectional Link Detection)
Q. 142:
Which command would you use to reset the interface configuration to its default on a Cisco switch?
a) no config interface
b) reset interface
c) clear switchport
d) default interface
Answer: (d) default interface
Q. 143:
Which command is used to configure a switch port to actively negotiate trunking using DTP?
a) switchport mode active
b) switchport mode trunk
c) switchport mode dynamic desirable
d) switchport mode dynamic active
Answer: (c) switchport mode dynamic desirable
Q. 144:
Which spanning tree state does a port enter when it is receiving BPDUs but not forwarding user data?
a) Forwarding
b) Learning
c) Listening
d) Blocking
Answer: (d) Blocking
Q. 145:
Which command verifies the current spanning tree root for a specific VLAN?
a) show spanning-tree vlan [vlan_id] root
b) show spanning-tree root
c) show spanning-tree bridge root
d) show spanning-tree vlan [vlan_id] bridge
Answer: (a) show spanning-tree vlan [vlan_id] root
Q. 146:
What is the effect of enabling BPDU Guard on a PortFast-enabled interface?
a) The interface forwards BPDUs
b) The interface immediately transitions to the forwarding state
c) The interface is disabled upon receiving a BPDU
d) The interface ignores BPDUs
Answer: (c) The interface is disabled upon receiving a BPDU
