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Questions and Answers
What is the primary function of the distribution layer in a hierarchical network design?
What is the primary function of the distribution layer in a hierarchical network design?
Which feature is implemented at the access layer of a hierarchical network design to provide security?
Which feature is implemented at the access layer of a hierarchical network design to provide security?
In a hierarchical network design, what is the purpose of implementing Virtual LANs (VLANs) at the access layer?
In a hierarchical network design, what is the purpose of implementing Virtual LANs (VLANs) at the access layer?
What role does the distribution layer play in a hierarchical network design regarding route aggregation?
What role does the distribution layer play in a hierarchical network design regarding route aggregation?
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Which function is NOT typically associated with the access layer in a hierarchical network design?
Which function is NOT typically associated with the access layer in a hierarchical network design?
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What is one of the key purposes of using Virtual access control lists (VACLs) at the access layer?
What is one of the key purposes of using Virtual access control lists (VACLs) at the access layer?
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Which layer in a hierarchical network design is responsible for implementing Policy-based security using access control lists (ACLs)?
Which layer in a hierarchical network design is responsible for implementing Policy-based security using access control lists (ACLs)?
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What distinguishes the access layer from other layers in a hierarchical network design in terms of its network segments?
What distinguishes the access layer from other layers in a hierarchical network design in terms of its network segments?
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What characterizes a two-tier collapsed core design in a hierarchical network structure?
What characterizes a two-tier collapsed core design in a hierarchical network structure?
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What is a drawback associated with the two-tier collapsed core design?
What is a drawback associated with the two-tier collapsed core design?
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In a routed hierarchical design, where is the Layer 3 boundary pushed towards?
In a routed hierarchical design, where is the Layer 3 boundary pushed towards?
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What routing strategy is applied in the routed hierarchical design towards the access layer?
What routing strategy is applied in the routed hierarchical design towards the access layer?
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Which layer of the hierarchical network design does Layer 3 switching occur in according to the text?
Which layer of the hierarchical network design does Layer 3 switching occur in according to the text?
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What does Spanning Tree Protocol (STP) limit in the two-tier collapsed core design?
What does Spanning Tree Protocol (STP) limit in the two-tier collapsed core design?
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How does a two-tier collapsed core design benefit smaller businesses according to the text?
How does a two-tier collapsed core design benefit smaller businesses according to the text?
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What functions are implemented by a single device in a two-tier collapsed core design?
What functions are implemented by a single device in a two-tier collapsed core design?
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What is the main limitation of Spanning Tree Protocol (STP) mentioned in the text regarding load balancing?
What is the main limitation of Spanning Tree Protocol (STP) mentioned in the text regarding load balancing?
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What is the primary disadvantage associated with the hierarchical network design exemplified by a routed campus network?
What is the primary disadvantage associated with the hierarchical network design exemplified by a routed campus network?
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Study Notes
Hierarchical Network Design
- To control the impact of routing-protocol processing and bandwidth consumption, use modular hierarchical topologies with protocols designed with these controls, such as OSPF and EIGRP.
Traditional Hierarchical LAN Design
- Consists of three layers: Core, Distribution, and Access.
- Core layer: provides fast transport between distribution switches within the enterprise campus.
- Distribution layer: provides policy-based connectivity.
- Access layer: provides workgroup or user access to the network.
Core Layer
- The network's high-speed switching backbone, crucial to corporate communications.
- Also referred to as the backbone.
- Characteristics:
- Fast transport
- High reliability
- Redundancy
- Low latency and good manageability
- Quality of Service (QoS)
Distribution Layer
- The isolation point between the network's access and core layers.
- Functions:
- Aggregation of LAN or WAN links
- Policy-based security (ACLs and filtering)
- Routing services between LANs and VLANs and between routing domains
- Redundancy and load balancing
- Boundary for route aggregation and summarization
- QoS mechanisms (priority-based queuing)
Access Layer
- Provides user access to local segments on the network.
- Characterized by switched LAN segments in a campus environment.
- Functions:
- Layer 2 switching
- High availability
- Port security
- QoS classification and marking and trust boundaries
- Address Resolution Protocol (ARP) inspection
- Virtual access control lists (VACLs)
- Spanning tree
- Power over Ethernet (PoE) and auxiliary VLANs for VoIP
Benefits of Hierarchical Models
- Cost savings
- Ease of understanding
- Modular network growth
- Improved fault isolation
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Description
Test your knowledge on modular hierarchical network topologies and routing protocols such as OSPF and EIGRP. Explore the three layers of traditional hierarchical LAN design and their functions.
