VLAN Ports JN0-352 Practice Questions (Page 1)

Questions 1–5

1. 1application · easy

   An access port on an EX switch is assigned to VLAN 10. A PC connected to this port sends an untagged frame. The switch forwards the frame to a trunk port that carries VLAN 10 as a tagged VLAN. What happens to the frame as it is forwarded out the trunk port?

   • AThe switch adds an 802.1Q tag with VLAN 10 before sending it out the trunk.
   • BThe switch removes the 802.1Q tag before sending it out the trunk.
   • CThe switch drops the frame because it cannot forward between access and trunk ports.
   • DThe switch sends the frame untagged because access ports do not tag frames.
   Reveal Solution Discussion Select an answer first
2. 2application · medium

   An administrator is configuring a trunk port between two EX Series switches. The trunk must carry VLANs 10, 20, and 30. VLAN 10 is the native VLAN. The administrator runs `set interfaces ge-0/0/1 unit 0 family ethernet-switching port-mode trunk` and `set interfaces ge-0/0/1 unit 0 family ethernet-switching vlan members [10 20 30]`. After committing, the administrator checks `show interfaces ge-0/0/1` and sees that the port is up. However, devices in VLAN 10 cannot communicate across the trunk. What is the most likely reason?

   • AThe native VLAN must be explicitly configured as untagged on the trunk port.
   • BVLAN 10 must be removed from the allowed list because it is the native VLAN.
   • CThe trunk port must be configured with `vlan members all` to allow VLAN 10.
   • DThe trunk port must be configured as an access port for VLAN 10.
   Reveal Solution Discussion Select an answer first
4. 3foundation · easy

   Which Junos operational command displays the VLAN membership of all interfaces?

   • Ashow configuration interfaces
   • Bshow interfaces terse
   • Cshow ethernet-switching table
   • Dshow vlans
   Reveal Solution Discussion Select an answer first
5. 4application · medium

   An administrator is configuring a trunk port between two switches. The trunk must carry VLANs 10, 20, and 30. The administrator configures `set interfaces ge-0/0/1 unit 0 family ethernet-switching port-mode trunk` and `set interfaces ge-0/0/1 unit 0 family ethernet-switching vlan members [10 20 30]`. After committing, the administrator runs `show ethernet-switching interface ge-0/0/1` and sees that the port is in VLANs 10, 20, and 30. However, devices in VLAN 20 cannot communicate across the trunk. What is the most likely cause?

   • AThe native VLAN is set to 20, and the devices are sending tagged frames.
   • BThe trunk port is not configured with `native-vlan-id 20`.
   • CThe devices in VLAN 20 are sending untagged frames, but the trunk port expects tagged frames for VLAN 20.
   • DThe trunk port must be configured as an access port for VLAN 20.
   Reveal Solution Discussion Select an answer first
6. 5application · medium

   A new employee's desk is being connected to a switch port that was previously used by a printer. The printer was in VLAN 50, and the port was configured as an access port. The employee's PC must be in VLAN 20. The administrator changes the access port's VLAN membership to 20. After the change, the PC cannot reach the network. The administrator runs `show ethernet-switching interface ge-0/0/2` and sees the interface is in VLAN 20 and the port is up. What is the most likely cause?

   • AThe port is still configured as a trunk from the printer's previous configuration.
   • BThe PC's MAC address is not in the VLAN 20 MAC address table.
   • CThe PC is sending tagged frames, but the access port expects untagged frames.
   • DThe switch port is administratively disabled.
   Reveal Solution Discussion Select an answer first