Podcast
Questions and Answers
What is the primary function of the Internet infrastructure?
What is the primary function of the Internet infrastructure?
What is the role of an ISP in the Internet architecture?
What is the role of an ISP in the Internet architecture?
What is the purpose of a programming interface in the Internet architecture?
What is the purpose of a programming interface in the Internet architecture?
What is the role of a network datacenter in the Internet architecture?
What is the role of a network datacenter in the Internet architecture?
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What is the primary function of the HTTP protocol?
What is the primary function of the HTTP protocol?
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What is the role of a home network in the Internet architecture?
What is the role of a home network in the Internet architecture?
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What is the purpose of an enterprise network in the Internet architecture?
What is the purpose of an enterprise network in the Internet architecture?
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What is the primary function of the Internet in the context of services?
What is the primary function of the Internet in the context of services?
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What is the term used to describe the collection of devices, routers, and links managed by an organization?
What is the term used to describe the collection of devices, routers, and links managed by an organization?
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What is the primary function of packet switches in the Internet?
What is the primary function of packet switches in the Internet?
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What is the term used to describe the transmission rate of a communication link?
What is the term used to describe the transmission rate of a communication link?
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What is the organization responsible for developing Internet standards?
What is the organization responsible for developing Internet standards?
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What is the protocol used for web communication?
What is the protocol used for web communication?
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What is the type of network that provides internet access to mobile devices?
What is the type of network that provides internet access to mobile devices?
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What is the term used to describe the devices that run network applications at the Internet's edge?
What is the term used to describe the devices that run network applications at the Internet's edge?
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What is the protocol used for streaming video?
What is the protocol used for streaming video?
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What is the term used to describe the Internet's architecture?
What is the term used to describe the Internet's architecture?
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What is the organization that publishes Internet standards as RFCs?
What is the organization that publishes Internet standards as RFCs?
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What is the primary function of a DSLAM in a digital subscriber line (DSL) access network?
What is the primary function of a DSLAM in a digital subscriber line (DSL) access network?
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What is the typical transmission rate range of a wireless local area network (WLAN) using 802.11b/g/n?
What is the typical transmission rate range of a wireless local area network (WLAN) using 802.11b/g/n?
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What is the primary function of a central office in a digital subscriber line (DSL) access network?
What is the primary function of a central office in a digital subscriber line (DSL) access network?
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What is the primary function of an institutional router in an enterprise network?
What is the primary function of an institutional router in an enterprise network?
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What is the typical range of a wireless local area network (WLAN) using 802.11b/g/n?
What is the typical range of a wireless local area network (WLAN) using 802.11b/g/n?
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What is the primary function of a cable or DSL modem in a home network?
What is the primary function of a cable or DSL modem in a home network?
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What is the primary function of a base station in a wireless access network?
What is the primary function of a base station in a wireless access network?
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What is the typical transmission rate range of a digital subscriber line (DSL) access network?
What is the typical transmission rate range of a digital subscriber line (DSL) access network?
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What is the primary function of an enterprise link in an enterprise network?
What is the primary function of an enterprise link in an enterprise network?
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What is the primary function of a wireless access point in a wireless access network?
What is the primary function of a wireless access point in a wireless access network?
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Study Notes
Access Networks
- Residential access networks, institutional access networks (schools, companies), and mobile access networks (Wi-Fi, 4G/5G) connect to local or regional ISP.
- Home network: wireless and wired devices connect to cable or DSL modem, which connects to ISP via central office.
- DSL (Digital Subscriber Line): uses existing telephone line to central office, transmits voice and data at different frequencies.
- DSL provides 24-52 Mbps dedicated downstream transmission rate and 3.5-16 Mbps dedicated upstream transmission rate.
Wireless Access Networks
- Shared wireless access network connects end system to router via base station (access point).
- Wireless local area networks (WLANs) provide 11, 54, or 450 Mbps transmission rate within a building (~30m).
- Wide-area cellular access networks provide 10's of Mbps transmission rate over larger areas (10's km).
Enterprise Networks
- Enterprise networks connect companies, universities, etc. to ISP via institutional router.
- Ethernet switch connects to institutional mail and web servers.
The Internet: A "Services" View
- The Internet provides infrastructure for services to applications: Web, streaming video, email, games, e-commerce, social media, etc.
- Provides a programming interface to distributed applications, allowing sending/receiving apps to "connect" to and use Internet transport service.
The Internet: A "Nuts and Bolts" View
- The Internet is a network of networks, comprising billions of connected devices (hosts/end systems) running network applications.
- Packet switches (routers, switches) forward packets (chunks of data) through communication links (fiber, copper, radio, satellite).
- Networks are managed by organizations, and transmission rates vary (bandwidth).
- Protocols (e.g., HTTP, IP, TCP, Wi-Fi, 4G/5G, Ethernet) control the sending and receiving of messages.
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Description
Learn about different types of access networks, including residential, institutional, and mobile networks, and how they connect to Internet Service Providers (ISPs). Understand home networks, DSL technology, and transmission rates.
