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?
- Clients
- Hosts (correct)
- Routers
- Intermediate Systems
Which systems forward/switch data from one link to another?
Which systems forward/switch data from one link to another?
- Hosts
- Routers
- Clients
- Intermediate Systems (correct)
What is the approximate number of hosts on the Internet in 2016?
What is the approximate number of hosts on the Internet in 2016?
- 500M hosts
- 6B hosts
- 1.5B hosts (correct)
- 3B hosts
Which type of network covers a distance of 2-50 km?
Which type of network covers a distance of 2-50 km?
Which category of systems provide services like Print Server or Mail Server?
Which category of systems provide services like Print Server or Mail Server?
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?
What is the bandwidth for CAT 5e cabling?
What is the bandwidth for CAT 5e cabling?
Which type of ISP operates on a global or national scale?
Which type of ISP operates on a global or national scale?
What is the primary transmission media for Wi-Fi networks?
What is the primary transmission media for Wi-Fi networks?
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?
Which network technology is associated with IEEE 802.11 standards?
Which network technology is associated with IEEE 802.11 standards?
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)
-
- Cable
-
- 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.
