Questions and Answers
What is the primary function of the device used in the access layer?
What is the main purpose of the three-tier architecture?
What is the name of the emulator tool used in the video to design and implement the three-tier architecture?
What is the order of the three tiers in the network architecture?
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What is the purpose of the distribution layer in the three-tier architecture?
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What is the primary benefit of using a network emulation tool?
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What is the name of the device configured in the emulator tool?
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What is the purpose of the access layer in the three-tier architecture?
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What type of device is used in the access layer?
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What is the primary function of a multilayer switch?
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Why are multiple connections used between devices in the network?
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What type of cable is often used for connectivity between the access layer and the distribution layer?
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What is the term used to describe the physical interface on a networking device?
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What is the purpose of aligning devices in the network diagram?
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What type of device is used in the core layer?
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What is the benefit of using link aggregation?
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What is the purpose of connecting the access layer to the distribution layer?
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What is the term used to describe the process of connecting devices in the network?
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What type of devices are represented in the access layer of the three-tier architecture?
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What is the purpose of the underlay in a network architecture?
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What type of switches are used in the core of the three-tier architecture?
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What is the purpose of the overlay in a network architecture?
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What is the primary function of the distribution layer in the three-tier architecture?
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What is the purpose of virtualized local area networks (VLANs) in a network architecture?
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What is the topological structure of the three-tier architecture?
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What is the purpose of the access layer in the three-tier architecture?
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What is the relationship between the core and other blocks in the three-tier architecture?
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What is the primary benefit of using the three-tier architecture?
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Study Notes
Three-Tier Architecture
A three-tier architecture consists of three layers: access layer, distribution layer, and core layer
In a three-tier architecture, the distribution layer and core layer serve different purposes and are not redundant. Here are the distinguishing differences between the two:
1. Distribution Layer:
- The distribution layer is responsible for routing traffic between the access layer and core layer.
- It acts as a boundary between the access layer where end devices connect and the core layer where the network backbone resides.
- The distribution layer provides services such as access control, traffic filtering, and policy enforcement.
- It helps in optimizing network performance by load balancing and providing redundancy for network paths.
- The distribution layer plays a crucial role in scaling the network and ensuring efficient communication between different parts of the network.
2. Core Layer:
- The core layer is the backbone of the network and is responsible for high-speed and high-volume data transmission.
- It is designed to provide fast and reliable connectivity between different parts of the network.
- The core layer typically consists of high-performance switches and routers that are optimized for speed and minimal latency.
- Unlike the distribution layer, the core layer does not perform tasks like access control or filtering. Its main focus is on fast and efficient data forwarding.
- The core layer is critical for ensuring seamless connectivity and minimal bottlenecks in the network infrastructure.
In summary, while the distribution layer handles routing and services between the access and core layers, the core layer serves as the high-speed backbone for transmitting data across the network. Both layers have distinct roles in a three-tier architecture, and their functions are essential for maintaining a robust and efficient network infrastructure.
The access layer is where devices plug in and is the closest to the end-user devices
The access layer uses layer 2 switches, which make forwarding decisions based on layer 2 header information
In a three-tier architecture, each layer serves a specific role:
1. Access Layer: This is where devices, like computers or phones, connect to the network. It's the closest layer to the end-user devices, and its main job is to provide a point of connection for these devices to access the network. In simpler terms, the access layer is like the gateway for your devices to connect to the network.
- Switches
- Wireless Access Points
- Network Interface Cards (NICs)
- Ethernet cables
2. Distribution Layer: The distribution layer helps manage the flow of data between the access layer and the core layer. It acts as a middle layer that controls how information is sent and received within the network. Think of it as a traffic manager directing the flow of data between different parts of the network.
- Switches
- Routers
- Layer 3 switches
- Load balancers
- Firewalls
3. Core Layer: The core layer is the backbone of the network, handling the bulk of the data transfer between different parts of the network. It's like the highway that carries information quickly and efficiently from one place to another within the network. The core layer ensures that data moves smoothly between devices and different parts of the network infrastructure.
- Routers
- Switches
- Firewalls
- Load balancers
- Layer 3 switches
- Intrusion prevention systems
- Network appliances designed for high-speed data transfer
- Other specialized networking equipment designed for high-throughput, low-latency communication tasks
Access Layer
- In the access layer, devices are connected to layer 2 switches
- Layer 2 switches are responsible for forwarding decisions based on layer 2 header information
- In the emulator, the access layer is represented by devices labeled Access-Switch-1, Access-Switch-2, etc.
Distribution Layer
- The distribution layer is responsible for connecting the access layer to the core layer
- The distribution layer uses multilayer switches, which can perform layer 2 switching and layer 3 routing
- Multilayer switches can forward packets based on layer 3 information
- In the emulator, the distribution layer is represented by devices labeled Distribution-1, Distribution-2, etc.
Core Layer
- The core layer is the backbone of the network and provides connectivity between different blocks or domains
- The core layer also uses multilayer switches
- In the emulator, the core layer is represented by devices labeled Core-1, Core-2, etc.
Connectivity and Fault Tolerance
- Devices in the access layer are connected to devices in the distribution layer
- Devices in the distribution layer are connected to devices in the core layer
- For fault tolerance, multiple connections are used between devices in the access layer and distribution layer
- Link aggregation is used to provide multiple connections between devices
Underlay and Overlay
- The underlay represents the physical components and physical interfaces of the network
- The overlay represents the logical layout of the network and how traffic flows
- Virtualized Local Area Networks (VLANs) are used to carve out logical subnets and control traffic flow
- Virtualized layer 3 interfaces are used at the distribution layer to act as default gateways for clients
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Description
Learn about the three-tier network architecture and how to design and implement it using a network emulation tool.
