Podcast
Questions and Answers
What type of ISP provides internet services to a specific geographical area?
What type of ISP provides internet services to a specific geographical area?
- Local ISP (correct)
- National ISP
- Regional ISP
- Global ISP
Which type of ISP provides internet services to a large geographical area, often spanning multiple cities or states?
Which type of ISP provides internet services to a large geographical area, often spanning multiple cities or states?
- Regional ISP (correct)
- Local ISP
- National ISP
- Global ISP
What type of ISP provides internet services to a country or large region?
What type of ISP provides internet services to a country or large region?
- Regional ISP
- National ISP (correct)
- Global ISP
- Local ISP
Which type of ISP provides internet services globally?
Which type of ISP provides internet services globally?
What is the primary function of an ISP?
What is the primary function of an ISP?
What is an example of a type of network that an ISP might provide access to?
What is an example of a type of network that an ISP might provide access to?
What is the Internet often viewed as?
What is the Internet often viewed as?
What type of network is often used to provide internet access to a specific geographical area?
What type of network is often used to provide internet access to a specific geographical area?
What is the primary function of a national ISP?
What is the primary function of a national ISP?
What type of ISP is often used to provide internet access to a large geographical area?
What type of ISP is often used to provide internet access to a large geographical area?
Study Notes
Physical Layer Technologies
- Fiber optic cable has the highest transmission rate and lowest bit error rate in practice.
Jargon and Abbreviations
- Nuts and bolts: the basic practical details.
- HTTP: HyperText Transfer Protocol.
- Wi-Fi: actually IEEE 802.11, but a marketing firm suggested the name Wi-Fi which resembles Hi-Fi.
- There are many types of Wi-Fi: b, a, g, n, ac (wave 1,2), ax.
- TCP: Transmission Control Protocol.
- IP: Internet Protocol.
- ISP: Internet Service Provider.
- IETF: Internet Engineering Task Force.
- RFC: Request for Comments.
- IEEE: Institute of Electrical and Electronics Engineers.
- IoT: Internet of Things.
- DSL: Digital Subscriber Line.
- ADSL: Asymmetric DSL.
Access Networks
- Residential access networks.
- Institutional access networks (school, company).
- Mobile access networks (Wi-Fi, 4G/5G).
Digital Subscriber Line (DSL)
- Uses existing telephone line to central office DSLAM.
- Data over DSL phone line goes to the Internet.
- Voice over DSL phone line goes to the telephone network.
- 24-52 Mbps dedicated downstream transmission rate.
- 3.5-16 Mbps dedicated upstream transmission rate.
Home Networks
- Wireless and wired devices.
- Often combined in a single box.
- Cable or DSL modem.
- WiFi wireless access point (54, 450 Mbps).
- Wired Ethernet (1 Gbps).
- Router, firewall, NAT.
Wireless Access Networks
- Shared wireless access network connects end system to router.
- Via base station aka “access point”.
- Wireless local area networks (WLANs) typically within or around a building (~30 m).
- 802.11b/g/n (WiFi): 11, 54, 450 Mbps transmission rate.
- Wide-area cellular access networks provided by mobile, cellular network operator (10’s km).
- 10’s Mbps transmission rate.
Enterprise Networks
- Companies, universities, etc.
- Enterprise link to ISP (Internet).
- Institutional router.
- Ethernet switch.
- Institutional mail, web servers.
- IEEE: Institute of Electrical and Electronics Engineers.
- WiFi.
The Internet: A “Services” View
- Infrastructure that provides services to applications.
- Provides programming interface to distributed applications.
- “Hooks” allowing sending/receiving apps to “connect” to, use Internet transport service.
- Provides service options, analogous to the postal service.
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Description
A quiz on physical layer technologies in computer networks, comparing transmission rates and bit error rates of different technologies.
