Introduction to network week 1 quiz and test

What's a router?

A device that knows how to forward data between independent networks A router connects independent networks by forwarding data between them.

Which layer abstracts away the need for any other layers to care about what hardware is in use?

Data link layer One of the primary purposes of the data link layer is to essentially abstract away the need for any other layers to care about the physical layer and what hardware is in use.

What is a cyclical redundancy check?

A mathematical calculation used to ensure that all data arrived intact. A cyclical redundancy check ensures that there was no data corruption.

What immediately follows the Start Frame Delimiter in an ethernet frame?

Destination Media Access Control (MAC) address The destination MAC address immediately follows the Start Frame Delimiter.

What does the letter B represent in a Media Access Control (MAC) address?

11 Since we don't have numerals to represent any individual digit larger than 9, hexadecimal numbers employ the letters A, B, C, D, E and F to represent the numbers 10, 11, 12, 13, 14 and 15.

What's the difference between a client and a server?

A client requests data, and a server responds to that request.

Which of the following are examples of layers of our five-layer network model? Check all that apply.

Application layer, transport layer, physical layer

You open a web page and log into your email. The traffic travels over many routers. What protocol will the routers use to determine the most optimal path to forward the traffic?

Border Gateway Protocol (BGP) Border Gateway Protocol (BGP) lets routers learn about the most optimal paths to forward traffic.

When data can flow across a cable in both directions, this is known as _____ communication.

Duplex Duplex communication occurs when data flows in both directions.

What is the type of modulation used by twisted pair cable computer networks known as?

Line coding Line coding is the modulation of an electrical charge so that each side of a connection knows what is a one and what is a zero.

What does LAN stand for?

Local Area Network

You get in your car after work and turn on the radio. What type of communication does the radio use?

Simplex A radio provides one way communication, or unidirectional. This is simplex communication.

Select the device that will have the most network ports.

Switch A switch will have the most network ports, because its purpose is to connect many devices.

UDP stands for ______.

User Datagram Protocol User Datagram Protocol is one of the more common transport layer protocols.

Which of the following statements accurately describe the differences between a hub and a switch? Check all that apply.

A switch remembers which devices are connected on each interface, while a hub does not. A hub is a physical layer device, and a switch is a dat link layer device. A hub causes larger collision domains.

What address is used for Ethernet broadcasts?

FF:FF:FF:FF:FF:FF The address FF:FF:FF:FF:FF:FF is used for Ethernet broadcast traffic.

What's the difference between full and half duplex?

Full duplex allows communications in two directions at the same time, half duplex means that only one side can communicate at a time. A half duplex connection allows communication in both directions, but only one side can communicate at a time.

You have installed a device at the physical layer. All of the systems you connect to this device will talk to each other at the same time. What have you installed?

Hub A hub is a physical layer device that allows for connections from many computers at once.

Which of the following is an example of a network layer (layer 3) protocol?

IP IP, or Internet Protocol, is the most common network layer protocol.

How many octets are there in a MAC address?

6 A MAC address is a 48-bit number consisting of 6 octets.

Something that requests data from a server is known as a ____.

Client A client requests data, and a server responds to that request.

What layer in the Transmission Control Protocol/Internet Protocol (TCP/IP) model is responsible for defining a way to interpret signals so network devices can communicate?

Data link layer The data link layer is responsible for defining a common way of interpreting signals so network devices can communicate.

MAC address stands for ____ address.

Media Access Control A MAC address is sometimes also referred to as a hardware address.

Which section in an ethernet frame contains the data from higher layers, such as Internet Protocol (IP) and the transport and application layers?

Payload The payload contains all of the data from higher layers, such as the IP, transport, and application layers, that's actually being transmitted.

The first part of an Ethernet frame is known as the _____.

Preamble The preamble is used to let the other side know that an Ethernet frame is incoming. It's also used for clock synchronization.