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27 Cards in this Set
- Front
- Back
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Why does the 3-layer heirarchal model simplify building a network?
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it focuses on 3 functional areas, rather than packet construction
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What are the three functional areas?
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core layer, distribution layer, and access layer
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What sort of equipment is in the core layer?
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high-end switches and high-speed cable, such as fiber
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What layer is responsible for routing LAN traffic?
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the distribution layer
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What layers are responsible for packet manipulation?
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the distribution and access layers
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What are the two primary duties of the core layer?
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speed and reliable delivery
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What sort of equipment is used at the distribution layer?
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LAN-based routers and Layer-3 switches
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What layer is responsible for ensuring that packets are properly routed between subnets and VLAN's?
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the distribution layer
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What is another name for the distribution layer?
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the Workgroup layer
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What sort of equipment is used in the access layer?
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hubs and switches
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What does the access layer do?
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ensures packets are delivered to end user computers
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What is another name for the access layer?
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the Desktop layer
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What are five benefits of Cisco's heirarchical model?
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high performance; efficient management and troubleshooting; policy creation; scalability; and behavior prediction
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What three factors should be considered when designing core-layer devices?
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high data-transfer rate, including load sharing; low latency period; and high reliability, including multiple data paths
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Why does the core layer not enforce policy?
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it would introduce too much latency
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What layer is responsible for routing?
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the distribution layer
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What layer provides policy-based connectivity?
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the distribution layer
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What are six examples of policy-based connectivity provided by the distribution layer?
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packet filtering; QoS; Access Layer aggregation point; controlling broadcast and multicast; application gateways; and queuing and packet manipulation
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What does a route summary do?
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consolidates traffic from multiple subnets into a single network connection
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What command will retrieve a routing summary from Cisco routers?
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show ip route summary
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What layer gives the ability to expand or contract a collision domain?
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the access layer
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What devices can be used to expand or contract a collision domain?
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a repeater, hub, or switch
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What is a collision domain?
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a part of an OSI physical layer where any communication sent by a node can be sensed by any other node on that collision domain
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What is a broadcast domain?
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part of OSI Layer 2/3 where a node can broadcast to any other node on that broadcast domain
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What four tasks does the access layer allow?
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MAC address filtering; creating separate collision domains (w/ switch); share bandwidth; and manage switch bandwidth
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What topology does the Access Layer use in a Collapsed Core model? |
Star: end devices have a single connection to a switch |
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What topology does the distribution layer use in a Collapsed Core model? |
Hybrid/partial mesh: access-layer switches will generally have links to multiple switches, and distribution-layer switches will usually have redundant links |
