CHAPTER 1 CN

Which of the following descriptions below correspond to a "nuts-and-bolts" view of the Internet? Select one or more of the answers below that are correct. [Hint: more than one of answers below are correct]

• A place I go for information, entertainment, and to communicate with people.

• A collection of hardware and software components executing protocols that define the format and the order of messages exchanged between two or more communicating entities, as well as the actions taken on the transmission and/or receipt of a message or other event.

• A collection of billions of computing devices, and packet switches interconnected by links.

• A platform for building network applications.

• A "network of networks"

Which of the following descriptions below correspond to a "services" view of the Internet? Select one or more of the answers below below that are correct below that are correct.  [Hint: more than one of answers below are correct].

• A collection of hardware and software components executing protocols that define the format and the order of messages exchanged between two or more communicating entities, as well as the actions taken on the transmission and/or receipt of a message or other event.

• A collection of billions of computing devices, and packet switches interconnected by links.

• A place I go for information, entertainment, and to communicate with people.

• A "network of networks".

• A platform for building network applications.

Which of the following human scenarios involve a protocol (recall: "Protocols define the format, order of messages sent and received among network entities, and actions taken on message transmission, receipt")? Select one or more answers below that are correct. Hint: more than one of answers below are correct

• A student raising her/his hand to ask a really insightful question, followed by the teaching acknowledging the student, listening carefully to the question, and responding with a clear, insightful answer.  And then thanking the student for the question, since teachers love to get questions.

• Two people introducing themselves to each other

• A person reading a book.

• A person sleeping.

• One person asking, and getting, the time to/from another person

Ethernet

• 1. Wired. Up to 100's Gbps per link.

• 1. Wireless, up to 10's Kbps per device.

• 1. Wired. Up to 1 Tbps per link.

• 1. Wired. Up to 10’s to 100’s of Mbps downstream per user.

WiFi

• 1. Wired. Up to 10’s of Mbps downstream per user.

• 1. Wireless. 10’s to 100’s of Mbps per device.

• 1. Wireless, up to 10's Kbps per device.

• 1. Wired. Up to 1 Tbps per link.

Cable access network

• 1. Wired. Up to 10’s of Mbps downstream per user.

• 1. Wired. Up to 100's Gbps per link.

• 1. Wired. Up to 10’s to 100’s of Mbps downstream per user.

• 1. Wired. Up to 1 Tbps per link.

Digital Subscriber Line

• 1. Wired. Up to 10’s of Mbps downstream per user.

• 1. Wired. Up to 100's Gbps per link.

• 1. Wireless, up to 10's Kbps per device.

• 1. Wired. Up to 10’s to 100’s of Mbps downstream per user.

4G cellular LTE

• 1. Wireless. Up to 10’s Mbps per device.

• 1. Wired. Up to 10’s of Mbps downstream per user.

• 1. Wireless. 10’s to 100’s of Mbps per device.

• 1. Wired. Up to 10’s to 100’s of Mbps downstream per user.

Which of the following physical layer technologies has the highest transmission rate and lowest bit error rate in practice?

• 802.11 WiFi Channel

• Twisted pair (e.g., CAT5, CAT6)

• Fiber optic cable

• Coaxial cable

Choose one the following two definitions that makes the correct distinction between routing versus forwarding.

• Routing is the local action of moving arriving packets from router’s input link to appropriate router output link, while forwarding is the global action of determining the source-destination paths taken by packets.

• Forwarding is the local action of moving arriving packets from router’s input link to appropriate router output link, while routing is the global action of determining the source-destination paths taken by packets.