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4. Wired LANs vs. Wireless LANs

Networking Fundamentals (Udemy)
129 بازدیدها · پیش 2 سال ها

Part 04 of Computer Networking Fundamentals: ⁣Wired Local Area Networks vs. Wireless Local Area Networks

Wired LANs vs Wireless LANs

At the end of this episode, I will be able to:

Compare and contrast wired and wireless LAN implementations.

Learner Objective: Identify the characteristics and importance of VLANs

Description: In this episode, the learner will be introduced to the basic constructs and characteristics of wired and wireless local area networks.

Introduction to Network Infrastructure
- Wired LAN
  - Devices in this type of LAN are connected using bounded media
  - Bounded media types
    - Copper - The most prevalent LAN-based network medium used today. This medium uses single or multiple copper conductors to transmited data.
    - Fiber - These medium uses an optical light source to transmit data through a concentrated core made of either plastic or glass.
  - For devices to communicate, they need to be physically connected via Ethernet switch
  - Due to the nature of the physical connections, wired networks can provide a higher level of security than wireless networks
  - Wired LANs can have constraints
    - Limitation of cabling (distance, electromagnetic interference, damage)
    - Building requirements (historical sites, cumbersome installations, proximity to the connectivity device)
    - Mobility is challenging
- Wireless LAN
  - Devices in this type of LAN connect to the network via radiated energy
  - Wireless LAN Types
    - Infrastructure mode - In this type of Wireless LAN, a centralized network device called a wireless access point controls all communications on the network.
    - Ad-hoc mode - In this type of Wireless LAN there is no centralized connectivity device. The wireless devices communicate directly with each other.
  - Wireless LANs have become increasingly more popular due today because:
    - Ease of installation
    - Reduction of physical cabling
    - Mobility
    - Simplicity to add devices to network
  - Disadvantages
    - Communication eminations
    - Obstacles and interference
    - Network saturation and congestion
- Hybrid LAN
  - Most common LAN deployment in modern networks today
  - This type of LAN combines both wired and wireless communication
  - Wired LAN
    - Workstations and servers (these are stationary devices)
  - Wireless LAN
    - Laptops, tablets, smartphones (these are devices that require mobility)
    - Any stationary device that requires a connection, but cabling is not feasible or possible

3. Virtual Local Area Networks

Networking Fundamentals (Udemy)
182 بازدیدها · پیش 2 سال ها

Part 03 of Computer Networking Fundamentals: Virtual Local Area Networks (VLANs)

Virtual Local Area Networks

At the end of this episode, I will be able to:

Identify the characteristics and importance of VLANs.

Learner Objective: Identify the characteristics and importance of VLANs

Description: In this episode, the learner will be introduced to Virtual Local Area Networks or VLANs as well as identify the purpose of implementing them in networks.

Introduction to Network Infrastructure
- What are VLANs? - A logical division of networked devices connected within a local area networked
- Why are VLANs important? - VLANs allow administrators to divide ports on a switch into logical groupings. This creates multiple logical switches out of a single physical switch. This can be done for performance and security.
- Understanding communication types
  - Broadcast - A communication message that is sent by a single device to every other device connected to the switch.
    - One to all communication
  - Unicast - A communication message that is sent by a single device to another device on the network.
    - One to one communication
  - Multicast - A communication message that is sent by a single device to a group or subset of the devices on the network.
  - Broadcast domain - A group of devices connected to a network that receive broadcast communications. This grouping can be based on physical or logical segments.
  - Segments - A divison that splits a network into smaller parts.
- Performance benefits - VLANs create virtual boundaries that reduce the amount of broadcast traffic between devices on a larger network and ease administration.
- Security benefits - VLANs allow network administrators to group devices together to assign an enforce security policies. Devices within a VLAN can only communicate with other devices assigned to the same VLAN.
- How are VLANs implemented?
  - VLANs require configuration of managed switches.
  - VLANs use tagging information that is inspected by the switch to determine which VLAN the communication belongs to.

2. Local Area Networks

Networking Fundamentals (Udemy)
162 بازدیدها · پیش 2 سال ها

Part 0⁣2 of Computer Networking Fundamentals: Local Area Networks

Local Area Networks

At the end of this episode, I will be able to:

Describe the components and attributes of a local area network.

Learner Objective: Describe the components and attributes of a local area network

Description: In this episode, the learner will identify the components and attributes of a local area network.

Introduction to Network Infrastructure
- Local area networks (LAN)
  - What is a network? - A group of computers, connected to common network links for the purpose of communication and sharing resources.
  - What are LANs? - A network comprising a single geographical region.
  - Components
    - Client workstations
    - Laptops
    - Mobile devices
    - Servers
    - Cabling - bounded transmission media
      - Standardized media
      - Copper or fiber
    - Connectivity or intermediate devices (Access points, switches, routers)
  - Network Models
    - Host-based - a centralized powerful computer performs all storage and processing of data. User inputs are captured from terminals, output is displayed on the terminal.
    - Client/Server - The most popular network model in modern networks, in which computers called clients request services and resources from other computers. Servers are the computers in a client/server network that respond to and provide services based on client requests.
    - Peer-to-peer - a decentralized network model in which every device evenly (peer) shares the various functions of the network (requesting resources and providing resources).