Computer Networking Lesson 1

A transport layer level segment combined with a network layer header is called a ...

• message

• datagram

• packet

• frame

Reorder the layers in their correct ascending order:

• Physical

• Data Link

• Network

• Transport

• Application

The e2e (end to end) principle suggests that specific application-level functions usually can, and preferably should be built into the lower levels of the system at the core of the network.

• True

• False

The e2e principle is summarized as: the ​ (a)   should be simple and minimal, while the ​ (b)   should carry the intelligence

• network core
• end systems

Some data link layer protocols, such 802.11 (WiFi), implement some basic error correction as the physical medium used is easily prone to interference and noise (such as a nearby running microwave). Is this a violation of the end-to-end principle?

• Yes

• No

Which of the following are ramifications of the “hourglass shape of the internet”?

• Many technologies that were not originally designed for the internet have been modified so that they have versions that can communicate over the internet (such as Radio over IP).

• It has been a difficult and slow process to transition to IPv6, despite the shortage of public IPv4 addresses.

• Applications like BitTorrent leverage peer-to-peer networking instead of a more traditional client-server model for better performance.

Which of the following statements are correct?

• The Spanning Tree Algorithm helps to prevent broadcast storms

• The Spanning Tree Algorithm presented in this lecture always results in a spanning tree that places the root in a topologically central location, so that all the nodes are as “close” as possible to the root.

• Network traffic cannot traverse an inactive link.

Match each layer to the unit of information it handles:

• datagram

• Network

• segment

• Physical

• frames

• Data Link

• bits

• Transport

• message

• Application

The Internet protocol stack has a layered architecture that resembles what kind of shape?

• Triangle

• Rectangular

• Hourglass

• Uniform

What is the initial ARPANET Host-to-Host protocol called?

• NSA

• NCP

• TCP

• UDP