Chapter 18

Question 1

Layer 3 EtherChannel (L3 EtherChannel)

Answer 1

Layer 3 EtherChannel (L3 EtherChannel)
An EtherChannel that acts as a routed port (that is, not a switched port), and as such, is used by a switch’s Layer 3 forwarding logic. As a result, the Layer 3 switch lists the Layer 3 EtherChannel in various routes in the switch’s IP routing table, with the switch balancing traffic across the various ports in the Layer 3 EtherChannel.

Question 2

multilayer switch

Answer 2

multilayer switch
A LAN switch that can also perform Layer 3 routing functions. The name comes from the fact that this device makes forwarding decisions based on logic from multiple OSI layers (Layers 2 and 3).

Question 3

routed port

Answer 3

routed port
A reference to the default logic on an interface on a router, such as de-encapsulating the Layer 3 packet from incoming Layer 2 frames and passing the packet to the Layer 3 forwarding logic of the device.

Question 4

Router-on-a-Stick (ROAS)

Answer 4

Router-on-a-Stick (ROAS)
Jargon to refer to the Cisco router feature of using VLAN trunking on an Ethernet interface, which then allows the router to route packets that happen to enter the router on that trunk and then exit the router on that same trunk, just on a different VLAN.

Question 5

subinterface

Answer 5

subinterface
One of the virtual interfaces on a single physical interface.

Question 6

switched port

Answer 6

switched port
A reference to the default logic on a Layer 2 switch port, such as learning the source MAC address of received frames and passing incoming frames to the Layer 2 forwarding logic of the device.

Question 7

switched virtual interface (SVI)

Answer 7

Another term for any VLAN interface in a Cisco switch.