01
Front
What does a Layer 2 switch do on an Ethernet LAN?
Back
A Layer 2 switch connects devices on an Ethernet LAN and forwards frames using MAC addresses.
Free Online Flashcard Deck
1 Layer 2 Switching Fundamentals Free Online FlashCards
Study 1 Layer 2 Switching Fundamentals with 12 free online flashcards. Review key terms, definitions, and concepts with this interactive flashcard deck.
12 cards
02
Front
Which address does a Layer 2 switch use to choose an output port?
Back
It examines the Ethernet header and uses the destination MAC address, not the destination IP address, to choose an output port.
03
Front
What information does a switch’s MAC address table associate?
Back
A MAC address table associates a MAC address with a port and, when VLANs are used, a VLAN.
04
Front
How does a switch learn a MAC address from an arriving frame?
Back
It records the source MAC address against the port and VLAN on which the frame arrived.
05
Front
How can a switch update its table when a host moves ports?
Back
When it receives a frame from the host on the new port, the switch can update the learned location.
06
Front
What does MAC address aging mean?
Back
Aging is the removal of a dynamically learned MAC table entry after it has been inactive for a period of time.
07
Front
How does a switch forward a known unicast to another port?
Back
If the destination MAC address maps to a different port, the switch forwards the frame out that port only.
08
Front
What happens to a frame with an unknown unicast destination?
Back
It floods the frame out eligible ports in the same VLAN, excluding the port on which the frame arrived.
09
Front
How does a switch handle a broadcast frame?
Back
It is flooded within its VLAN, except back out the incoming port.
10
Front
What if a known destination is on the frame’s incoming port?
Back
It filters the frame instead of sending it back out the same port.
11
Front
How does a VLAN affect MAC learning and forwarding?
Back
A VLAN provides a separate switching context, so MAC learning and forwarding apply within that VLAN.
12
Front
What is needed for communication between separate Layer 2 networks?
Back
Communication between separate Layer 2 networks requires a Layer 3 device, such as a router or Layer 3 switch.
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