150 CCNA Switch Configuration MCQS with Explanation

121. Which command is used to verify the status of port security on a switch port?

  • a) show port-security
  • b) show security
  • c) show port-security status
  • d) show port security

Answer: d) show port security

The show port security command displays information about port security settings and status.

122. Fill in the blank: The command show ip interface provides detailed information about _____ and its IP configuration.

  • a) MAC addresses
  • b) Routing protocols
  • c) Interfaces
  • d) VLANs

Answer: c) Interfaces

The show ip interface command provides detailed information about the interfaces and their IP configurations.

123. Which command is used to configure a static IP address for a VLAN interface on a switch?

  • a) ip address
  • b) vlan ip address
  • c) interface vlan
  • d) ip vlan address

Answer: c) interface vlan

The interface vlan command is used to configure an IP address for a VLAN interface.

124. Fill in the blank: To configure a switch port as a trunk port, use the command _____ mode trunk.

  • a) switchport
  • b) interface
  • c) vlan
  • d) port

Answer: a) switchport


The switchport mode trunk command configures a port to operate as a trunk port.

125. Which command shows the IP addresses of devices that have recently communicated with the switch?

  • a) show ip arp
  • b) show ip dhcp
  • c) show ip address
  • d) show ip interface

Answer: a) show ip arp

The show ip arp command displays the ARP table, which includes the IP addresses and corresponding MAC addresses of devices that have communicated with the switch.

126. Fill in the blank: The command show running-config | include vlan filters the running configuration to display only _____ configurations.

  • a) IP
  • b) VLAN
  • c) Interface
  • d) Access list

Answer: b) VLAN

The show running-config | include vlan command filters the running configuration to display only VLAN-related configurations.

127. What is the effect of configuring a port as switchport mode dynamic auto?

  • a) The port will actively attempt to negotiate trunking
  • b) The port will passively wait to negotiate trunking
  • c) The port will only allow untagged traffic
  • d) The port will block all traffic

Answer: b) The port will passively wait to negotiate trunking


The switchport mode dynamic auto command configures the port to passively wait for the connected device to initiate trunking negotiations.

128. Fill in the blank: The _____ command is used to display a summary of the VLANs that are allowed on a trunk port.

  • a) show vlan allowed
  • b) show trunk vlan
  • c) show interfaces trunk
  • d) show vlan brief

Answer: c) show interfaces trunk

The show interfaces trunk command provides a summary of VLANs that are allowed on trunk ports.

129. Which command displays the configuration of a specific interface?

  • a) show interface
  • b) show interface config
  • c) show interfaces status
  • d) show running-config interface

Answer: d) show running-config interface

The show running-config interface command displays the configuration of a specific interface.

130. Fill in the blank: The command switchport port-security maximum specifies the maximum number of _____ allowed on a switch port.

  • a) IP addresses
  • b) MAC addresses
  • c) VLANs
  • d) Trunks

Answer: b) MAC addresses

The switchport port-security maximum command specifies the maximum number of MAC addresses that can be learned on a switch port.
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