The Bits and Bytes of Computer Networking. Week 1: Networking Basics

How many wires are in a standard Category 6 cable?

8; A standard Cat6 cable has 8 wires that consist of four twisted pairs inside of a single jacket.

A defined set of standards that computers must follow in order to communicate properly is known as a _____. switch/ collision domain/ modulation/ protocol

not a collision domain.

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

Line coding

When an electrical pulse on one wire is accidentally detected on another nearby wire, this is known as _____.

cross talk; Crosstalk is reduced by the way that wires are twisted inside of a cable.

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

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

What is the fifth layer of the Transmission Control Protocol/Internet Protocol (TCP/IP) model?

Application

What is used to determine when the communications channels are clear and when a device is free to transmit data?

Carrier Sense Multiple Access with Collision Detection (CSMA/CD) is used to determine when the communications channels are clear and when a device is free to transmit data.

What does LAN stand for?

Local area network

What device forwards data and operates at layer three of the Transmission Control Protocol/Internet Protocol (TCP/IP) model?

Router; A router is a device that knows how to forward data between independent networks and operates at layer three.

Which of the following are examples of layers of our five-layer network model? Check all that apply. The physical layer The transport layer, The presentation layer The application layer

The physical layer The transport layer, The application layer

How many octets are there in a MAC address?

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

Multiple systems try to send data at the same time. The electrical pulses sent across the cable interfere with each other. What type of network segment is being used?

Collision Domain; A collision domain is a network segment where only one device can communicate at a time.

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

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

MAC address stands for ____ address.

media access control

What section in an ethernet frame will you find a Virtual Local Area Network (VLAN) header?

EtherType field, You may find a VLAN header in the EtherType field. This will indicate that the frame is called a VLAN frame.

What address is used for Ethernet broadcasts?

FF::FF:FF::FF::FF:FF

Which layer in the Transmission Control Protocol/Internet Protocol (TCP/IP) model is responsible for delivering data between two nodes? Datalink, Network, Transport, Application

Not Transport

You need to identify the manufacturer of a network interface. Where will you look for this information?

The first three octets of a MAC address are known as the Organizationally Unique Identifier (OUI). These are assigned to individual hardware manufacturers.

What's a router?

a device that knows how to forward data between independent networks.

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.

Which of the following is an example of a network layer (layer 3) protocol? IP, TCP, UDP, Ethernet

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

Select the device that will have the most network ports. Desktop, Server, Switch, Laptop

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

The Ethernet protocol functions at which layer of the Transmission Control Protocol/Internet Protocol (TCP/IP) model?

Data link; A lot of protocols exist at the data link layer, but the most common is Ethernet.

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.

Where is the Start Frame Delimiter (SFD) found in an ethernet frame?

The last byte of the preamble, The SFD is found in the last byte of the preamble, and signals to a receiving device that the preamble is over, and that the actual frame contents will now follow.

A device that knows how to forward traffic between independent networks is known as a _____.

router