9 Questions
What is the function of a DSLAM in a DSL network?
Transmit data over DSL phone line to the Internet
Which access network technology provides asymmetric transmission rates?
Cable network
What is the purpose of a cable modem termination system (CMTS) in an HFC network?
Manage data and TV transmission in the access network
Which wireless technology is typically used for wide-area wireless access?
3G, 4G: LTE
Which physical media has two concentric copper conductors?
Coaxial cable
What is a characteristic of fiber optic cables?
Carry light pulses for data transmission
In a DSL network, where does voice data over DSL phone lines go?
To the telephone network
Which device combines wireless access, routing, firewall, and wired Ethernet capabilities?
Wireless access point
What is the purpose of an Ethernet switch in an enterprise access network?
Distribute data within the institutional network
Study Notes
Network Structure
- The Internet is a network of networks that connect millions of computing devices (hosts) such as PCs, laptops, mobile devices, and smartphones.
- These devices are connected through access networks, links, and physical media (wired and wireless) to the global Internet.
Network Edge
- The network edge consists of end systems (hosts), access networks, and links.
- End systems can be clients, servers, and other devices that run network applications.
- Servers are often located in data centers.
Network Core
- The network core consists of interconnected routers that forward packets of data.
- The network core is a network of networks, where multiple ISPs (Internet Service Providers) are interconnected.
Communication
- Communication occurs through wireless and wired links, including fiber, copper, radio, and satellite transmission.
- Transmission rates are measured in bandwidth.
Protocols
- Protocols are the set of rules that govern data communication over the Internet.
- Examples of protocols include TCP, IP, HTTP, and 802.11.
- Protocols define the format and order of message transmission and reception, as well as the actions taken on message transmission and receipt.
Internet Services
- The Internet provides services to applications, including Web, VoIP, email, games, e-commerce, and social networks.
- The Internet provides a programming interface to applications, allowing them to connect to the Internet and exchange data.
Security
- The Internet is vulnerable to security threats, and security protocols are necessary to protect data transmission.
History of the Internet
- The Internet has a rich history, with its development influenced by various organizations and individuals.
RFC and IETF
- RFC (Request for Comments) is a series of documents that define the Internet standards.
- IETF (Internet Engineering Task Force) is an organization that oversees the development of Internet standards.
Test your knowledge on network edge, access networks, physical media, network core, packet switching, circuit switching, Internet structure, network performance, security, protocol layers, and service models based on Chapter 1 of a networking textbook.
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