28 Questions
What is the primary function of the Internet infrastructure?
To provide services to applications and enable communication between devices
What is the role of an ISP in the Internet architecture?
To connect devices to the Internet through local or national networks
What is the purpose of a programming interface in the Internet architecture?
To provide a platform for developing distributed applications
What is the role of a network datacenter in the Internet architecture?
To host web applications and provide content to users
What is the primary function of the HTTP protocol?
To send and receive data over the web
What is the role of a home network in the Internet architecture?
To connect devices to the Internet through WiFi technology
What is the purpose of an enterprise network in the Internet architecture?
To enable communication between devices within an organization
What is the primary function of the Internet in the context of services?
To enable communication between devices and provide services to applications
What is the term used to describe the collection of devices, routers, and links managed by an organization?
Network
What is the primary function of packet switches in the Internet?
To forward packets
What is the term used to describe the transmission rate of a communication link?
Bandwidth
What is the organization responsible for developing Internet standards?
IETF (Internet Engineering Task Force)
What is the protocol used for web communication?
HTTP
What is the type of network that provides internet access to mobile devices?
Mobile network
What is the term used to describe the devices that run network applications at the Internet's edge?
Hosts
What is the protocol used for streaming video?
Skype
What is the term used to describe the Internet's architecture?
Network of networks
What is the organization that publishes Internet standards as RFCs?
IETF (Internet Engineering Task Force)
What is the primary function of a DSLAM in a digital subscriber line (DSL) access network?
To split the voice and data signals
What is the typical transmission rate range of a wireless local area network (WLAN) using 802.11b/g/n?
11, 54, 450 Mbps
What is the primary function of a central office in a digital subscriber line (DSL) access network?
To connect multiple DSL lines to a high-speed backbone network
What is the primary function of an institutional router in an enterprise network?
To connect the enterprise network to the Internet
What is the typical range of a wireless local area network (WLAN) using 802.11b/g/n?
within or around a building (~30 m)
What is the primary function of a cable or DSL modem in a home network?
To connect the home network to the Internet
What is the primary function of a base station in a wireless access network?
To connect end systems to a router
What is the typical transmission rate range of a digital subscriber line (DSL) access network?
24-52 Mbps (downstream), 3.5-16 Mbps (upstream)
What is the primary function of an enterprise link in an enterprise network?
To connect the enterprise network to the Internet
What is the primary function of a wireless access point in a wireless access network?
To provide wireless access to the Internet
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.
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.
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