Term
| What are the three layers of the Cisco three-layer Heirarchal model? |
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Definition
| Access, DIstribution, Core. |
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Term
| What are some characteristics of the Access layer of the C3LHM? |
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Definition
-Provides end user access to the network
-Provides QoS and Multicast support options.
-Security through Dynamic Arp Inspection, DHCP snooping, BPDU Guard, port-security, and IP Source Guard. |
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Term
| What are some characteristics of the Distribution layer of the C3LHM? |
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Definition
-Is the aggregation point for access switches.
-Uses routing policies.
-Segments workgroups and thier problems from the Core.
-Provides availability, QoS, fast path srecovery, and load balancing. |
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Term
| What are some characteristics of the Core layer of the C3LHM? |
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Definition
-Backbone that provides high-speed layer 3 links between Distribution layers and other network segments.
-no other policies, like ACLs or filters, should be used that will slow traffic down. |
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Term
| Without a Core layer, what must the distribution switches be? |
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Definition
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Term
| What is it called when you combine the Distribution and Core layers? |
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Definition
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Term
| What are the Cisco definitions of small, medium, and large networks? |
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Definition
-Small: < 200
-Medium: 200 - 1000
-Large: 1000+ |
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Term
| What are the three layers of the Data Center Model? |
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Definition
| Core, Aggregation, Access. |
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Term
| While the Core and Access layers of the Data Center Model are very similar to the C3LHM, what Characterises the Aggregation layer? |
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Definition
-Server load balancing.
-content switching
-SSL off-load
-and security through firewalls and IPS. |
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Term
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Definition
| Service-Oriented Network Architecture. |
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Term
| What are the three layers of the SONA? |
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Definition
-Network Infrastructure (hardward)
-Interactive Services (resources allocated to applications, using the network infrastructure)
-Applications (policy and logic, leverages the interactive services layer to meet business needs.) |
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Term
| What are the two sublayers of the SONA Applications layer? |
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Definition
| Application layer and Collaboration layer. |
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Term
| What does PPDIOO stand for? |
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Definition
| The Prepare, plan, design, implement, operate, and optimize lifecycle aproach. |
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Term
| What are the three types of traffic flows in a campus network? |
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Definition
-Local (Same segment/VLAN, Access layer only)
-Remote (Different segment/VLAN, Access and distro layers)
-Enterprise (central for all users, all three layers) |
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Term
| You can divide enterprise campus networks into what two basic modular elements |
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Definition
| The Switch Block and the Core Block. |
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Term
| What are some rules for creating Switch Blocks? |
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Definition
-The should contain a balanced mix of L2 and L3 functionaloty
-Distro layer devices should be multi-layer switches.
-STP should be confined to each Switch Block
-VLANs should be contained as well and NEVER traverse the network core. |
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Term
| What is the recommended user limit on a switch block? |
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Definition
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Term
| Switch Block size should be based on what? |
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Definition
-Traffic types and behavior
-Size and number of common workgroups |
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Term
| Generally a switch block is too large if what conditions are observed? |
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Definition
-Layer three bottlenecks in the Distro layer
-Broadcast/multicast traffic starts to slow the switches in the block. |
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Term
| As a best practice when using switch blocks, where should L2 connectivity be contained? |
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Definition
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Term
| As a best practice when using switch blocks, where should L3 connectivity be contained? |
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Definition
| In the Distribution Layer. |
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Term
| What are the two basic Core Block designs? |
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Definition
| Collapsed core, Dual Core. |
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Term
| What distinguishes a Dual Core Core-block design? |
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Definition
| A dual core connects two or more switch blocks in a redundant fasion. |
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Term
| What are the two most important aspects to consider when designing a network Core Layer? |
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Definition
-Devices can effectivly forward traffic when EVERY link is at 100% utilization.
-High port density of high-speed links. |
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