Podcast
Questions and Answers
What type of systems are considered as sinks or source of data?
What type of systems are considered as sinks or source of data?
Which systems forward/switch data from one link to another?
Which systems forward/switch data from one link to another?
What is the approximate number of hosts on the Internet in 2016?
What is the approximate number of hosts on the Internet in 2016?
Which type of network covers a distance of 2-50 km?
Which type of network covers a distance of 2-50 km?
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Which category of systems provide services like Print Server or Mail Server?
Which category of systems provide services like Print Server or Mail Server?
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What do Telecommunication Companies like AT & T, Verizon, and Comcast provide access to?
What do Telecommunication Companies like AT & T, Verizon, and Comcast provide access to?
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What is the bandwidth for CAT 5e cabling?
What is the bandwidth for CAT 5e cabling?
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Which type of ISP operates on a global or national scale?
Which type of ISP operates on a global or national scale?
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What is the primary transmission media for Wi-Fi networks?
What is the primary transmission media for Wi-Fi networks?
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Which category of UTP cabling has a twist length of 7.5cm to 10cm?
Which category of UTP cabling has a twist length of 7.5cm to 10cm?
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Which network technology is associated with IEEE 802.11 standards?
Which network technology is associated with IEEE 802.11 standards?
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Study Notes
Network Basics
- Enables data transfer among nodes
- Comprises heterogeneous nodes, more than two nodes
- End Systems: sinks or source of data, examples include Desktop, Laptop, Servers, Printers, Cellphones, etc.
- Intermediate System: forward/switch data from one link to another, examples include Routers, switches
Host and Clients
- Host: End Systems that provide service, examples include Print Server, Storage Server, Mail Server, etc.
- Clients: End Systems that request service
Links and Internet
- Links: connect systems, characterized by transmission rate, propagation delay
- Internet: Inter-Network, connecting multiple networks
- Approximately 1.5 billion hosts on Internet in 2016
- Internet Service Provider (ISP): provides access to Internet, examples include Telecommunication (Telephone) Companies, Coffee Shops (Wi-Fi)
Network Types
- Local Area Network (LAN): 0-2km, single ownership
- Metropolitan Area Network (MAN): 2-50 km
- Wide Area Network (WAN): 50+ km
ISP and Access
- Types of ISPs: Tier 1 (Global or National), Tier 2 (Regional), Tier 3 (Local)
- Access: between subscriber and service provider, divided into Metro (covering the city), Core (between cities)
Transmission Media
- Guided: Twisted Pair, Coaxial Cable, Optical Fiber
- Unguided: Microwave, Satellite, Wireless
UTP Categories
- CAT 3: up to 16Mhz, voice grade, twist length of 7.5cm to 10cm
- CAT 4: up to 20Mhz, not used much in practice
- CAT 5: up to 100Mhz, used in 10Mbps and 100Mbps Ethernet, twist length of 0.6cm to 0.85cm
- CAT 5e (Enhanced), Cat6, Cat7...
Network Edge
- Enterprise Network: Ethernet, Wi-Fi
- Ethernet: uses UTP, 10Mbps, 100Mbps, 1 Gbps, 10Gbps, originally bus, now point-to-point (Star) topology
- Wi-Fi: IEEE 802.11, uses 2.4Ghz and 5.8Ghz
Access Networks
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- DSL (Digital Subscriber Line)
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- Cable
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- Fiber-To-The-Home (FTTH)
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- Wi-Fi (Wireless Fidelity)
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- LTE (Long Term Evolution)
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Description
This quiz covers the basic components of a computer network, including end systems, intermediate systems, hosts, clients, and links. Test your knowledge on the roles and functions of these network elements.
