APCS Principles Nov Quiz Internet and Encryption

Which of the following is NOT true about TCP/IP packets?

• Packets are numbered so if they arrive out of order the message can be reassembled.

• TCP guarantees that no packets are ever dropped

• Packets can be routed on different paths from sender to receiver.

• Messages are broken into packets to improve reliability of the internet

The Internet Engineering Task Force (IETF) defines the protocols and standards for how the Internet works. The members of the IETF are:

• An International coalition of government agencies who oversee the Internet in their countries.

• A collection of the leaders of the Tier 1 Internet service providers.

• A loosely organized collection of citizens and engineers.

• Political leaders and heads of state.

• There are no members. IETF is an "organization" in name only.

How does a computer resolve a domain name into an IP address?

• A. It asks a DNS server for the corresponding IP address.

• It scans addresses until it finds the one it's looking for

• It uses a Border Gateway Protocol to get the address from a nearby computer.

• It creates an IP address for the domain, and shares it with the closest DNS.

The world is currently in a transition to using IPv6, a newer version of the IP protocol that uses 128-bit addresses instead of 32-bit addresses used by IPv4. What is the main problem that IPv6 was created to solve?

• 32-bit addresses could not accommodate the increased size and amount of data traveling on the Internet as it has grown in popularity

• IPv6 will allow problems with IPv4's address hierarchy to be resolved

• IPv4 proved unreliable in some cases where network redundancy could not be ensured

• 32-bit addresses could not ensure that every internet-connected device can receive a unique IP address

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

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

• 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 fit.

A school starts tracking which websites each computer in the school is visiting by monitoring the packets leaving the school. A sample of the information they have collected appears above:

Which of the following is MOST likely to be answerable using all the data collected by this monitoring?

• Which students are visiting social media sites from school

• Which classes are assigning the most homework using the computers

• Which programs students are running on the lab computers

• Which websites are most frequently visited before and after school hours from a school computer

According to the domain name system (DNS), which of the following is a subdomain of the domain example.com?

• about.example.com

• example.co.uk

• example.com.org

• example.org

If the same key is used to encrypt and decrypt a message, this is known as? 

• Symmetric encryption
• Encryption doesn't exist!
• Asymmetric encryption
• Same-key encryption

hello has been encrypted with Caesar cipher to khoor. The key used was:

• abc
• 3
• 2
• alphabet mapping table

The key for a random substitution cipher is 

• a number
• an alphanumeric string
• a mapping of the letters of the alphabet to other letters
• two keys, a public and a private