Questions and Answers
What is the primary purpose of the access layer in a three-tier architecture?
What type of switches are typically used in the access layer?
What is the advantage of using a network emulation tool like EVE-NG?
What is the difference between the access layer and the distribution layer?
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What is the purpose of the core layer in a three-tier architecture?
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What is the advantage of using a three-tier architecture?
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What is the purpose of the distribution layer in a three-tier architecture?
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What is the benefit of representing the three-tier architecture with the access layer at the bottom?
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What is the primary function of a multilayer switch in a network?
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What type of connection is often used between the access layer switches and the distribution layer devices?
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What is the purpose of using multiple connections between devices in a network?
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What is the term used to refer to the physical interface on a router?
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What is the purpose of the access layer in the three-tier architecture?
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What is the primary advantage of using link aggregation in a network?
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How do you typically connect devices in a network emulator like EVE-NG?
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What type of switches are used at the core of the three-tier architecture?
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What is the concept of creating logically separate networks on top of the physical infrastructure?
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What is the purpose of aligning devices vertically and horizontally in a network diagram?
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What is the purpose of Virtualized Local Area Networks (VLANs)?
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What is the typical location of the access layer switches in a network?
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What is the three-tier architecture composed of?
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What is the term used to refer to the physical interface on a switch?
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What is the term for the physical components and interfaces of a network?
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What is the purpose of using multiple connections between the distribution layer devices and the core devices?
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What is the purpose of the distribution layer in the three-tier architecture?
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What is the term for the process of logically separating networks and controlling traffic flow?
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What is the purpose of the core layer in the three-tier architecture?
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What type of devices are connected to the access layer in the three-tier architecture?
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Study Notes
Three-Tier Architecture
- The three tiers in a three-tier architecture are: access layer, distribution layer, and core
- The access layer is where devices such as PCs plug in and includes layer 2 switches
- Layer 2 switches make forwarding decisions based on layer 2 header information
- The distribution layer includes multilayer switches, which can do layer 2 switching and layer 3 forwarding or routing of packets
- The core layer includes devices that connect to the distribution layer and provide connectivity to the internet or other blocks of addresses
- The three tiers work together to provide access to the internet for devices in the access layer
Designing the Three-Tier Architecture
- To design the three-tier architecture, switches and multilayer switches are added to the access, distribution, and core layers
- Connectivity is established between the layers using RJ45 connectors or fiber for fault tolerance
- Link aggregation can be used to provide multiple connections between devices for fault tolerance
Underlay and Overlay
- The physical components and physical interfaces of the network are referred to as the underlay
- The overlay represents how traffic will flow logically through the network
- Virtualized Local Area Networks (VLANs) can be used to carve out logical subnets within the network
- The overlay and virtualization control how traffic will flow, including the use of virtualized layer 3 interfaces at the distribution layer as default gateways for clients
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Description
Designing and implementing a three-tier network architecture using a network emulation tool. Planning and setting up a three-tier architecture from scratch.