Week5-Technology: Internets and Packets

Week5-Technology: Internets and Packets

• Common Link Layer technologies are…

1. WiFi
2. Optical
3. Satellite
4. Ethernet
5. Cable Modem
6. DSL

• **When looking at addresses form most general to most specific, we read IP addresses ________ and we read domain addresses _________. **

1. left to right, right to left

• When do wireless devices receive their serial numbers (i.e. MAC or Ethernet addresses)?

1. When they are manufactured

• What does the time taken for a packet to reach a destination usually reflect?

1. The speed of light and the distance the packet has to travel

• How do wireless devices operating on a shared network determine when to send information so as not to incur chaos?

1. They listen to the sound on the current network, and send information when it is quiet.

• What is the concern when deciding which device sends information next on Ethernet?

1. Ensuring fairness – that one type of device, data, or user is not preferred over others.

• What is the maximum possible number of hops a packet can take to try to reach their destination (the so-called “Time To Live” functionality of packets)?

1. 255

• What are Router Tables?

1. Dynamic lists of directions for where and how to direct packets

• What are the layers, and in what order do we structure them?

1. Application Layer
   Transport Layer
   Internetwork Layer
   Link Layer

• What is the Internet Protocol Layer responsible for?

1. Getting a packet to a specific network address

• How is an IP address determined?

1. Geographically

• The prefix of an IP address determines what?

1. The network that it belongs to

• What is the Link Layer responsible for?

1. Deciding on the next link that a packet should be sent on once it is inside of a router

• Is it possible to track a packet’s journey across the network?

1. Yes, using a technique called ‘traceroute’ which tracks the packets that are returned due to transmission failure.

原文地址：http://www.cnblogs.com/jqhuang2021/p/16852712.html