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Questions and Answers
What is the primary purpose of the access layer in a three-tier architecture?
What is the primary purpose of the access layer in a three-tier architecture?
- To make forwarding decisions based on layer 3 header information
- To connect devices to the internet (correct)
- To connect to the core layer
- To provide redundancy in the network
What type of switches are typically used in the access layer?
What type of switches are typically used in the access layer?
- Layer 2 switches (correct)
- Firewalls
- Layer 3 routers
- Wireless access points
What is the advantage of using a network emulation tool like EVE-NG?
What is the advantage of using a network emulation tool like EVE-NG?
- It allows for the configuration of layer 3 routers
- It allows for the design of a three-tier architecture
- It allows for the simulation of network traffic
- It allows for the implementation of a three-tier architecture (correct)
What is the difference between the access layer and the distribution layer?
What is the difference between the access layer and the distribution layer?
What is the purpose of the core layer in a three-tier architecture?
What is the purpose of the core layer in a three-tier architecture?
What is the advantage of using a three-tier architecture?
What is the advantage of using a three-tier architecture?
What is the purpose of the distribution layer in a three-tier architecture?
What is the purpose of the distribution layer in a three-tier architecture?
What is the benefit of representing the three-tier architecture with the access layer at the bottom?
What is the benefit of representing the three-tier architecture with the access layer at the bottom?
What is the primary function of a multilayer switch in a network?
What is the primary function of a multilayer switch in a network?
What type of connection is often used between the access layer switches and the distribution layer devices?
What type of connection is often used between the access layer switches and the distribution layer devices?
What is the purpose of using multiple connections between devices in a network?
What is the purpose of using multiple connections between devices in a network?
What is the term used to refer to the physical interface on a router?
What is the term used to refer to the physical interface on a router?
What is the purpose of the access layer in the three-tier architecture?
What is the purpose of the access layer in the three-tier architecture?
What is the primary advantage of using link aggregation in a network?
What is the primary advantage of using link aggregation in a network?
How do you typically connect devices in a network emulator like EVE-NG?
How do you typically connect devices in a network emulator like EVE-NG?
What type of switches are used at the core of the three-tier architecture?
What type of switches are used at the core of the three-tier architecture?
What is the concept of creating logically separate networks on top of the physical infrastructure?
What is the concept of creating logically separate networks on top of the physical infrastructure?
What is the purpose of aligning devices vertically and horizontally in a network diagram?
What is the purpose of aligning devices vertically and horizontally in a network diagram?
What is the purpose of Virtualized Local Area Networks (VLANs)?
What is the purpose of Virtualized Local Area Networks (VLANs)?
What is the typical location of the access layer switches in a network?
What is the typical location of the access layer switches in a network?
What is the three-tier architecture composed of?
What is the three-tier architecture composed of?
What is the term used to refer to the physical interface on a switch?
What is the term used to refer to the physical interface on a switch?
What is the term for the physical components and interfaces of a network?
What is the term for the physical components and interfaces of a network?
What is the purpose of using multiple connections between the distribution layer devices and the core devices?
What is the purpose of using multiple connections between the distribution layer devices and the core devices?
What is the purpose of the distribution layer in the three-tier architecture?
What is the purpose of the distribution layer in the three-tier architecture?
What is the term for the process of logically separating networks and controlling traffic flow?
What is the term for the process of logically separating networks and controlling traffic flow?
What is the purpose of the core layer in the three-tier architecture?
What is the purpose of the core layer in the three-tier architecture?
What type of devices are connected to the access layer in the three-tier architecture?
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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