VLAN Tagging JN0-352 Practice Questions (Page 3)

Questions 11–15

1. 11application · medium

   You are comparing ISL and 802.1Q trunking for a network that includes both Juniper and Cisco switches. Which statement accurately describes a key difference between the two protocols?

   • AISL uses a 4-byte tag, while 802.1Q uses a 30-byte header.
   • BISL supports only a single VLAN per trunk, while 802.1Q supports multiple VLANs.
   • CISL encapsulates the entire Ethernet frame, while 802.1Q inserts a tag into the frame.
   • DISL is an open standard, while 802.1Q is proprietary to Cisco.
   Reveal Solution Discussion Select an answer first
2. 12foundation · easy

   How does an access port handle frames that arrive with an 802.1Q tag?

   • AIt forwards them with the tag intact.
   • BIt uses the tag to determine the VLAN and forwards accordingly.
   • CIt drops the frame because access ports cannot receive tagged frames.
   • DIt strips the tag and assigns the frame to the port's VLAN.
   Reveal Solution Discussion Select an answer first
4. 13foundation · easy

   How are VLAN tags propagated across switches in a network?

   • ATags are stored in a separate control plane database and applied at each hop.
   • BTags are added by each switch and removed at the destination switch.
   • CTags are carried within the frame as it traverses trunk links between switches.
   • DTags are only used on the first and last switch in the path.
   Reveal Solution Discussion Select an answer first
5. 14application · medium

   A user reports that their device, connected to an access port on a Juniper switch, cannot communicate with other devices in the same VLAN. The access port is configured for VLAN 10. A packet capture on the device shows that it is sending frames with an 802.1Q tag for VLAN 10. What is the most likely issue?

   • AThe access port is assigned to the wrong VLAN.
   • BThe switch is not tagging the frames from the access port.
   • CThe device is sending tagged frames, but the access port expects untagged frames.
   • DThe access port is configured to accept tagged frames only.
   Reveal Solution Discussion Select an answer first
6. 15foundation · easy

   Why is IEEE 802.1Q generally preferred over ISL in modern networks?

   • AIt is an open standard and supports interoperability between vendors.
   • BIt adds less overhead because it uses a 2-byte tag.
   • CIt provides higher security by encrypting VLAN tags.
   • DIt supports more VLANs than ISL.
   Reveal Solution Discussion Select an answer first