Chapter 2 Review

Abstraction is reducing information and detail to focus on essential characteristics.

• True

• False

There are different types of HTTP traffic associated with visiting different types of websites. YouTube is an example of what kind website:

• Static website

• Streaming website

• News website

• Loading website

A single central register of IP addresses and names (i.e. a DNS-style system) is an efficient means of translating human-readable names to IP addresses. Which of the following is NOT solved by DNS?

• It’s inefficient to have everyone on the Internet maintain their own list of IP addresses.

• There are too few IP addresses to meet the current demand.

• When someone new joins the Internet, they need to inform every one of their IP address.

• When an IP address changes, it is impossible to locate a computer until the owner announces the change.

Why do computers need to periodically check the DNS for websites you have already visited?

• The IP address associated with a given URL is not static; it can change.

• The IP address associated with a given URL is static; it can’t change

• To make sure the website hasn't crashed

• To break the messages its sending into packets

True or False: We don’t we need to know the IP addresses for our favorite sites because when we type in a web page address and click [enter] the browser contacts the DNS server to look up the IP address.

• True

• False

Which of the following best describes what happens when a new device is connected to the Internet?

• A device driver is assigned to the device.

• An Internet Protocol (IP) address is assigned to the device.

• A packet number is assigned to the device.

• A web address is assigned to the device.

HTTP is considered to be a high level protocol because:

• HTTP requests are given higher priority for fast delivery when being routed on the Internet.

• HTTP requests are encoded using higher frequency radio waves.

• HTTP messages can be either requests or responses.

• HTTP requests make use of abstractions provided by lower level protocols.

Kendall has been asked to talk with a small group of new teachers and explain how the Internet works. Which of the following explanation best describes the framework/architecture on which the Internet is built?

• A user is sitting at her computer surfing the Internet and wants to download a recipe from a site. She hits the download button to initiate the file transfer. The request is broken down into a series of smaller segments called packets that are sent through multiple routers until they are put back together at the web server which processes and answers the request. The process is then repeated the other way going back to the user.

• A user wants to stream a live video feed from an online service. Once she selects the movie, the server takes the video and breaks it into ordered chunks of equal size. The server then sends the chunks in the correct order to the user who uses a video player to decode the chunks and play the video. When one chunk is done playing, the video server sends the next one.

Which of the following are true statements about digital certificates in Web browsers?

I - Digital Certificates are used to verify the ownership of encrypted keys used in secured communication.

II - Digital Certificates are used to verify that the connection to a Web site is fault tolerant.

• I only

• II only

• I and II

• Neither I nor II

The various protocols in use on the internet are said to operate in layers in which the protocol(s) at each layer solve one problem related to networked communication, and higher layers are build on top of, and rely on, the lower layers to do their jobs. From the list provided chose the two (2) answers that correctly describe which internet protocol relies on the other. For example, if protocol A relies on protocol B, it means that A is a higher level protocol than B and thus protocol B must exist and work properly in order for protocol A to do its job. Select TWO answers.

• TCP/IP relies on HTTP

• HTTP relies on TCP/IP

• DNS relies on TCP/IP

• TCP/IP relies on DNS