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5 Layer 2 Switching Troubleshooting Scenarios Free Online FlashCards

Study 5 Layer 2 Switching Troubleshooting Scenarios with 12 free online flashcards. Review key terms, definitions, and concepts with this interactive flashcard deck.

12 cards
01
Front

How should you trace a Layer 2 connectivity problem?

Back

Trace the frame from the endpoint access port, across each trunk, to the destination VLAN, checking configuration and operational state along the way.

02
Front

What should you verify first on an endpoint port?

Back

The access port must be up and assigned to the intended VLAN.

03
Front

What must be true of a VLAN on a switch forwarding its traffic?

Back

The VLAN must exist and be active on each switch that needs to forward its traffic.

04
Front

Does an operational trunk necessarily carry every VLAN?

Back

A trunk can be up and trunking yet exclude a particular VLAN from its allowed list.

05
Front

How can you add VLAN 20 without replacing a trunk’s existing list?

Back

Use `switchport trunk allowed vlan add 20` to add VLAN 20 without replacing the existing allowed list.

06
Front

How is native-VLAN traffic sent on an 802.1Q trunk?

Back

Native-VLAN traffic on an 802.1Q trunk is sent untagged.

07
Front

What can happen when trunk ends use different native VLANs?

Back

Traffic can be placed into different VLANs at the two ends, and spanning tree may report a native-VLAN or PVID inconsistency.

08
Front

What does `Altn BLK` indicate in spanning-tree output?

Back

`Altn BLK` indicates an alternate path that spanning tree is holding out of forwarding to prevent a Layer 2 loop; this can be normal.

09
Front

Why might spanning tree block a redundant path?

Back

Spanning tree selects a loop-free topology for each VLAN or spanning-tree instance.

10
Front

How can you make a switch more likely to become the STP root?

Back

Set a deliberate root priority on the intended root switch; a lower priority value than competing switches is preferred.

11
Front

What should you check if a switch has not learned an endpoint’s MAC address?

Back

Check the access-port state and VLAN assignment, then look for the endpoint’s address with `show mac address-table dynamic interface <interface>`.

12
Front

What should you investigate if the VLAN is correct but no MAC is learned?

Back

Check the physical link, endpoint NIC, port security or other interface restrictions, and whether the endpoint is transmitting.