28 Questions
What provides services to applications such as web, email, and social media?
Infrastructure
What is the primary function of the infrastructure in the Internet?
To provide services to applications
What is an example of a type of network mentioned in the text?
All of the above
What is the role of the Internet in terms of sending and receiving data?
It provides a transport service for sending and receiving data
What is the analogy used to describe the Internet's transport service?
Postal service
What is the purpose of the programming interface provided by the Internet?
To enable applications to use Internet services
What is the term used to describe the interconnected appliances mentioned in the text?
Inter-connected appliances
What type of network is mentioned as a provider of streaming video?
Content provider network
What is the primary function of a DSL splitter?
To separate data and voice signals from a single phone line
In a home network, what is the primary function of a cable or DSL modem?
To connect devices to the internet
What is the primary difference between a local ISP and a global ISP?
Local ISP provides regional coverage, global ISP provides global coverage
What is the primary transmission rate range of a DSL connection?
24-52 Mbps
What is the primary function of a central office?
To connect to a regional ISP
What type of network connects end systems to a router via a base station?
Wide-area cellular access network
What is the primary function of an institutional router?
To connect to an ISP
What type of network provides internet access to companies, universities, etc.?
Enterprise network
What is the primary transmission rate range of a WiFi wireless access point?
54, 450 Mbps
What is the primary function of a mobile access network?
To provide internet access to mobile devices
What is the Internet composed of, from a nuts and bolts perspective?
A collection of interconnected networks
What is the primary function of packet switches in the Internet?
To forward packets of data
What is the term for the amount of data that can be transmitted over a communication link?
Bandwidth
What is the term for a collection of devices, routers, and links managed by an organization?
Network
What is the primary function of routers in the Internet?
To switch packets of data
What is the term for the rules that control the sending and receiving of messages over the Internet?
Protocols
What is the organization responsible for developing Internet standards?
IETF
What is the protocol that enables communication between devices on the Internet?
IP
What is the term for a request for comments on Internet standards?
RFC
What is the protocol that enables web communication on the Internet?
HTTP
Study Notes
Access Networks
- Residential access networks provide internet access to homes.
- Institutional access networks provide internet access to schools, companies, and other institutions.
- Mobile access networks provide internet access through WiFi, 4G, and 5G networks.
DSL (Digital Subscriber Line)
- Uses existing telephone lines to connect to the central office.
- Data and voice transmitted at different frequencies over the same line.
- Dedicated downstream transmission rate: 24-52 Mbps.
- Dedicated upstream transmission rate: 3.5-16 Mbps.
Home Networks
- Wireless and wired devices are often combined in a single box.
- Cable or DSL modem connects to the internet.
- WiFi wireless access point (54, 450 Mbps) and wired Ethernet (1 Gbps) connect devices.
Wireless Access Networks
- Shared wireless access network connects end systems to a router.
- Base station (access point) connects devices.
- Wireless local area networks (WLANs): 802.11b/g/n (WiFi), 11, 54, 450 Mbps transmission rate.
- Wide-area cellular access networks: 10's Mbps, 4G/5G cellular networks.
Enterprise Networks
- Companies, universities, and other institutions use enterprise networks.
- Institutional router and Ethernet switch connect to the ISP.
- IEEE (Institute of Electrical and Electronics Engineers) sets standards.
The Internet: A "Services" View
- The internet provides services to applications: Web, streaming video, email, games, e-commerce, social media, and more.
- Provides a programming interface to distributed applications.
The Internet: A "Nuts and Bolts" View
- The internet consists of billions of connected devices: hosts, packet switches, communication links, and networks.
- Packet switches forward packets of data.
- Communication links: fiber, copper, radio, satellite.
- Networks are managed by organizations.
- Internet: a "network of networks" interconnected by ISPs.
Internet Standards
- IETF (Internet Engineering Task Force) sets standards.
- RFC (Request for Comments) documents standards.
- Examples: HTTP, TCP, IP, WiFi, Ethernet.
This quiz covers the different types of internet service providers, including residential, institutional, and mobile access networks. It also explores the relationships between local and regional ISPs, home networks, and content providers.
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