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8 Cards in this Set
- Front
- Back
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What is the definition of a LAN?
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A LAN includes all devices in the same broadcast domain.
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From the perspective of broadcast domains, what is a VLAN?
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Switches separate ports into different VLANS to put them in different broadcast domains.
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What are some reasons for using VLAN's?
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1. To logically group individuals or devices. 2. To reduce overhead by limiting the size of each broadcast domain. 3. To enforce better security by keeping sensitive devices on a separate VLAN. 4. To separate specialized traffic such as VOIP.
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What is VLAN trunking?
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When you have VLAN's distributed across multiple switches, the switches need to be able to tell which VLAN traffic was sent from.
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What trunking protocols do Cisco switches support?
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Inter-Switch Link (ISL) and IEEE 802.1q. (ISL is proprietary, so it can only be used between 2 cisco switches).
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What is the difference between the way ISL adds a VLAN identifier and the way 802.1q does it?
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ISL completely encapsulates the frame in an ISL header. 802.1q doesn't encapsulate, it just adds an extra 4-byte header field to the middle of the original Ethernet header. Then it has to recalculate the FCS.
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Which trunking protocols support multiple spanning trees?
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Both ISL and 802.1q support multiple spanning trees, but ISL did so much sooner.
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Do switches forward frames between VLAN's?
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No. Different VLAN's are, by definition, different subnets. Only routers can forward frames between VLAN's.
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