Study with Steph - Episode on Networks with Justin Kennington

Introduction

• Guest: Justin Kennington, President of SDVoE
• Discussion on networks, focusing on computer networks

Basics of Networks

• Network Definition: A network is a group of intelligent entities connected to exchange information
  • Example: Social networks (group of people exchanging information)

Types of Networks

• Computer Networks: A group of computers connected in a specific topology to exchange information
• Ethernet Networks: Dominant technology, mostly discussed

OSI Model

• Conceptual model (not physical) that breaks down computer communication into 7 layers
• Layers:
  1. Physical Layer: Voltage on wire, RF energy, light on fiber optics (1s and 0s)
  2. Data Link Layer: Where Ethernet starts, interpretation of 1s and 0s, MAC addresses
  3. Network Layer: Smart switches, logical bus topology
  4. Transport Layer: Facilitates data transfer across networks (TCP/UDP)
  5. Session Layer: Manages sessions/connections
  6. Presentation Layer: Data translation and encryption
  7. Application Layer: End-user applications interface (web browsers, email clients)

Key Network Concepts

• Ethernet Address/MAC Address: Unique for every device in the world
• Hubs vs. Switches:
  • Hubs: Repeat signals to all devices, inefficient for bandwidth
  • Switches: Intelligent devices that direct data to the correct recipient using MAC addresses

Common Topologies

• Bus Topology: Devices share a single communication line
• Star Topology: Devices connected to a central switch, forming a star shape
• Mesh Topology: Multiple access points connect wirelessly to share load and coverage
• Ring Topology (historical): Devices connected in a circular pattern, now rarely used

Wired vs Wireless Networks

• Wired Networks: Generally more robust and reliable

  • Example: Corporate networks, home wired setups (Star topology)
  • Media: Twisted pair cables (Cat5, Cat6), Fiber optics

• Wireless Networks: Offers flexibility, good for homes and non-wired setups

  • Example: Home mesh networks for Wi-Fi coverage

LAN and WAN

• LAN (Local Area Network): Devices within a close geographical area, single broadcast domain
• WAN (Wide Area Network): Interconnects multiple LANs over large distances
  • Example: Internet, connecting homes to large data centers

Types of Communication

• Unicast: One-to-one communication
• Broadcast: One-to-all communication within a LAN
• Multicast: One-to-selective-many communication

Practical Applications and AV over IP

• Designing a Network: Consider number of hosts, bandwidth needs, communication requirements
• AV over IP: Increased need for bandwidth, consistent data flow, importance of intelligent switches

Educational Resources

• SDVoE Academy: Training on AV over IP and network design principles
• CTS Exam Tip: 43% of answers are C (humorous note)

Conclusion

• Importance of understanding both AV and IT networking principles for modern integrators
• Encouragement to utilize educational resources to bridge knowledge gaps