Routers, Redundancy, Packets

What does the Router do?

• Manages and sends packets via the cheapest route.

• Keeps track of the traffic on the Internet.

• Provides Internet addresss for packets of Information.

• Uses TCP to control the speed of packets over the Internet.

• Creates a firewall to prevent unwanted information from reaching you.

Which best explains 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 site is assigned to the device.

• You are asked for payment to access the ISP

Which of these best describes fault-tolerance on the Internet?

• The ability to stop cyberattacks

• The ability to transmit data even when some connections have failed

• The ability for DNS servers to retrieve the correct IP addresses of websites

• The ability for the Internet to handle billions of unique users

• The ability to debug a website

Which of these best describes the scalability of the Internet?

• The ability to stop cyberattacks

• The ability to transmit data even when some connections have failed

• The ability for DNS servers to retrieve the correct IP addresses of websites

• The ability for the Internet to handle billions of unique users

• The ability to copy a program illegally for many users.

Which of these best describes the redundancy of the Internet?

• There are many different paths for information to travel from point A to point B.

• Information on the Internet is broken up into packets.

• A router directs a packet by reading its destination IP address.

• The Internet can handle billions of unique users at once.

When I type "www.gmail.com" into my web browser and hit enter, which of the following best describes what happens?

• My computer sends a request to a TCP server, which sends back the IP address for GMail.

• My computer sends a request to a DNS server, which sends back the IP address for GMail.

• My computer makes a direct connection to gmail.com and starts receiving packets.

• My computer sends a request to a gmail.com server, which sends back the IP address for a DNS server.

Which of the following is true about how packets are sent over the Internet?

• Packets are received in the same order they are sent.

• When data is broken down into packets, they all travel the same route through the Internet to their destination.

• Packets may travel different routes to the same destination, and are frequently dropped along the way.

• If TCP does not receive all packets for a particular communication, then every single packet must be re-sent.

In the Internet Simulator, your class is using 6 routers. You are on router 1 and your friend is on router 4. When you send them a message, what path will the packets travel?

• Your computer --> Router 1 --> Router 2 --> Router 3 --> Router 4 --> Their computer

• Your computer --> Router 1 --> Router 4 --> Their computer

• Your computer --> Router 4 --> Their computer

• There is no way to know in advance, but it will start with Router 1 and end with Router 4.

You're sending a message to a friend on the Internet Simulator. They're connected to a different router than you. To communicate with them, you need to know their _______________________.

• Domain Name System (DNS)

• Transmission Control Protocol (TCP)

• Router Address

• Internet Protocol (IP) Address

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