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CS 101 Attendance

This document explores the concept of asynchronous communication, where the sender and recipient do not need to be online simultaneously. It highlights examples like email and instant messaging, discusses the role of servers and clients on the internet, and identifies valid IPv4 numbers. The text also delves into domain names, the role of ICANN in internet governance, and the various ways to connect to the internet through ISPs. Additionally, the principles behind packet-based IP design and the structure of domain names are examined.

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CS 101 Attendance

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Presentation Transcript

  1. CS 101 Attendance 3/6/2013

  2. Asychronous communication • is a bad connection • means the recipient and sender to NOT have to be online at the same time • is how email works • is how an Instant Messager works • 2 and 3

  3. Are there more servers or clients on the Net? • client machines • server machines • impossible to tell • depends on which domain you are considering

  4. Which one is a valid IPv4 number? • 74.125.73.99 • 500.234.91.33 • 150-234-91-11 • 57.98.132

  5. .com, .net, .edu – these are • Low-level domain names • Root-level domain names • Top level domain names • Browser names

  6. Connections to the Internet • Can be done with a regular phone line • Can be done with a cable modem • Can be done with a satellite modem • Usually go through an ISP • All of the above

  7. Choosing an ISP involves considering • Their cost • Their choice of connections • Their space allowances • Their support • All of the above

  8. .ca, .de, .ie are • Country codes • Top level domains • Low-level domains • 1 and 2

  9. ICANN • Controls content of all web pages on the Net • Controls top-level domains • Manages the registrars for the DNS • Approves new IP standards • All choices but 1

  10. Ethernet is • The same as the DNS system • The same as IP • Used on LANs • Uses broadcast techniques • 3 and 4

  11. Domain names go from • More specific to less as you read left to right • Closer to the user to farther away • Shorter to longer names from left to right • Larger IP numbers to smaller ones

  12. Cybersquatting • Doesn’t happen these days, it used to • Involves someone registering a domain name • Involves coercion / blackmail • 2 and 3

  13. A protocol • Prevents communication • Governs how a conversation happens • Has been superseded by Ethernet • Will cost more but improves bandwidth • Is only used by computers

  14. In a domain name like rose.cs.uky.edu • Rose is the most general part of the name • Edu means that it is a temporary address • Cs is a subdomain of uky • None of the answers

  15. ICANN is • The Internet political committee • The corporation which makes rules about domain names • The sole registrar of the Internet domain name system • A branch of the US government

  16. IP designed around packets because • Easier to get small amounts of data through a line with bad connection • Cheaper to use low-quality lines • Packets can be routed to take advantage of changing traffic patterns • All of the answers

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