AP CSP Unit 1 Remediation (most missed questions)

Which of the following BEST describes how protocols on the Internet (e.g. IP, TCP, HTTP) make use of abstraction to accomplish their respective purposes?

• High level protocols can take on the role of a low level protocol in the event of failure in the system.

• High level protocols take into account specific implementation details of lower level protocols to ensure they are compatible

• Low level protocols can provide functionality to high level protocols without revealing the details of how this is accomplished

• Low level protocols are written in binary while high level protocols are written in hexadecimal

The latency of a network connection is most appropriately measured with which of the following units?

• Milliseconds

• Bits per byte

• Bits per second

• Bytes

Internet protocol version 4 (IPv4) represents each IP address as a 32-bit binary number. Internet protocol version 6 (IPv6) represents each IP address as a 128-bit binary number. Which of the following best describes the results of using 128-bit addresses instead of 32-bit addresses?

• 2⁴ times as many addresses are available

• 2⁹⁶ times as many addresses are available

• 4 times as many addresses are available

• 96 times as many addresses are available

Which of the following statements are true about routers and routing on the Internet. Choose two answers.

• Routers are hierarchical and the “root” router is responsible for communicating to sub-routers the best paths for them to route internet traffic

• A packet traveling between two computers on the Internet may be rerouted many times along the way or even lost or “dropped”

• Routers act independently and route packets as they see it.

• Protocols ensure that a single path between two computers is established before sending packets over it.

Which of the following statements accurately describe the hierarchy of the Web pages example.org and about.example.org? Select two answers

• The web page example.org is a domain under the top-level domain .org

• The web page example.org is a domain under the top-level domain example

• The web page about.example.org is a subdomain of about.org

• The web page about.example.org is a subdomain of example.org

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 built on top of, and rely on, the lower layers to do their jobs. From the list provided choose 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.

• HTTP relies on TCP/IP

• DNS relies on TCP/IP

• TCP/IP relies on HTTP

• TCP/IP relies on DNS