MAC learning, VLANs, 802.1Q trunking, STP port roles and states, RSTP, EtherChannel and inter-VLAN routing.
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- What process allows a switch to build its MAC address table?
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MAC learning - switches learn source MAC addresses from frames that arrive on ports- When does a switch add a MAC address to its MAC address table?
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When a frame with a new source MAC address arrives on a port- What does a switch do when it receives a frame with an unknown destination MAC address?
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It floods the frame out all ports except the incoming port- What is the default aging time for entries in a switch's MAC address table?
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300 seconds (5 minutes)- Can a single MAC address be learned on two different switch ports simultaneously?
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No, a MAC address can only exist on one port; if learned on a different port, the old entry is aged out- What is a VLAN?
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A logical subdivision of a switch that isolates traffic, allowing devices on different VLANs to be separated even on the same physical switch- What is the primary benefit of using VLANs?
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They reduce broadcast domains and improve security by isolating network traffic- What is VLAN 1 on a Cisco switch?
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The default VLAN to which all ports are assigned if not configured otherwise- Can devices in different VLANs communicate without a router or layer 3 switch?
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No, a router or layer 3 switch is required for inter-VLAN routing- What is dynamic VLAN assignment?
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VLANs assigned automatically based on MAC address, IP address, or protocol- What is the valid range of VLAN IDs?
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1 to 4094 (VLANs 1002 to 1005 are reserved for Token Ring and FDDI)- What is 802.1Q?
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An IEEE standard for VLAN tagging that adds a 4-byte header to Ethernet frames to identify the VLAN- What does 802.1Q add to an Ethernet frame?
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A 4-byte tag containing the TPID (0x8100) and VLAN ID- What is a trunk port?
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A port that carries traffic for multiple VLANs and uses 802.1Q to tag frames with their VLAN IDs- What is the maximum VLAN ID that can be carried in an 802.1Q tag?
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