Bits and Bytes of Computer Networking quiz answers Coursera

Coursera Google The Bits and Bytes of Computer Networking quiz answers to all weekly questions (weeks 1-6):

Week 1: Introduction to Networking
Week 2: The Network Layer
Week 3: The Transport and Application Layers
Week 4: Networking Services
Week 5: Connecting to the Internet
Week 6: Troubleshooting and the Future of Networking

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The Bits and Bytes of Computer Networking quiz answers

The Bits and Bytes of Computer Networking is Course 2 of the five-course Google IT Support Professional Certificate.

This course is designed to provide a full overview of computer networking. We’ll cover everything from the fundamentals of modern networking technologies and protocols to an overview of the cloud to practical applications and network troubleshooting.

By the end of this course, you’ll be able to: ● describe computer networks in terms of a five-layer model ● understand all of the standard protocols involved with TCP/IP communications ● grasp powerful network troubleshooting tools and techniques ● learn network services like DNS and DHCP that help make computer networks run ● understand cloud computing, everything as a service, and cloud storage

Week 1: Introduction to Networking quiz answers

Welcome to the Networking course of the IT Support Professional Certificate! In the first week of this course, we will cover the basics of computer networking. We will learn about the TCP/IP and OSI networking models and how the network layers work together. We’ll also cover the basics of networking devices such as cables, hubs and switches, routers, servers and clients. We’ll also explore the physical layer and data link layer of our networking model in more detail. By the end of this module, you will know how all the different layers of the network model fit together to create a network.

The Data Link Layer

Question 1

How many octets are there in a MAC address?

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

Question 2

What address is used for Ethernet broadcasts?

00:00:00:00:00:00
11:11:11:11:11:11
FF:FF:FF:FF:FF:FF
FF:00:FF:00:FF:00

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

Question 3

What is a cyclical redundancy check?

A technique that allows for multiple logical LANs to operate on the same equipment
The actual data being transported by an Ethernet frame
A way for two computers to synchronize their clocks
A mathematical calculation used to ensure that all data arrived intact

A cyclical redundancy check ensures that there was no data corruption.

Networking Devices

Question 1

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

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

Question 2

What does LAN stand for?

Locally available network
Local area network
Little area network
Large area network

LAN stands for Local Area Network.

Question 3

What’s a router?

A network device used specially for fiber cables
A more advanced version of a switch
A device that knows how to forward data between independent networks
A physical layer device that prevents crosstalk

A router connects independent networks by forwarding data between them.

TCP/IP

Question 1

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

Ethernet
IP
UDP
TCP

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

Question 2

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

Clients and servers are different names for the same thing.
A server requests data, and a client responds to that request.
Clients operate on the data link layer, and servers operate on the network layer.
A client requests data, and a server responds to that request.

Question 3

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

The physical layer
The application layer
The presentation layer
The transport layer

The Data Link Layer

Question 1

How many octets are there in a MAC address?

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

Question 2

What address is used for Ethernet broadcasts?

00:00:00:00:00:00
11:11:11:11:11:11
FF:FF:FF:FF:FF:FF
FF:00:FF:00:FF:00

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

Question 3

What is a cyclical redundancy check?

A technique that allows for multiple logical LANs to operate on the same equipment
The actual data being transported by an Ethernet frame
A way for two computers to synchronize their clocks
A mathematical calculation used to ensure that all data arrived intact

A cyclical redundancy check ensures that there was no data corruption.

The Physical Layer

Question 1

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

Line crimping
Simplex communication
Line coding
RJ45

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.

Question 2

What’s the difference between full and half duplex?

Full duplex is slower than 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.
Full duplex is a form of simplex communications.
Half duplex occurs when hubs are in use; full duplex occurs when switches are in use.

A half duplex connection allows communication in both directions, but only one side can communicate at a time.

Week 1 Graded Assessment

Week 2: The Network Layer quiz answers

In the second week of this course, we’ll explore the network layer in more depth. We’ll learn about the IP addressing scheme and how subnetting works. We’ll explore how encapsulation works and how protocols such as ARP allow different layers of the network to communicate. We’ll also cover the basics of routing, routing protocols, and how the Internet works. By the end of this module, you’ll be able to describe the IP addressing scheme, understand how subnetting works, perform binary math to describe subnets, and understand how the Internet works.

Routing

Question 1

Select examples of routing protocols. Check all that apply.

Border Gateway Protocol
Routing Information Protocol
Transmission Control Protocol
Hypertext Transfer Protocol
User Datagram Protocol

Question 2

Who is permitted to use non-routable address space?

Anyone
The IANA
It’s for testing purposes only
The IETF

Anyone can use non-routable address space.

Question 3

A typical routing table may contain which of the following? Check all that apply.

Destination address
Total hops
Destination network
TTL

Subnetting

Question 1

What does CIDR stand for?

Classless Internet Destination Routing
Classfull Inter-Destination Routing
Classless Inter-Domain Routing
Classfull Identification Routing

CIDR stands for Classless Inter-Domain Routing.

Question 2

Which of the following is a correct form of CIDR notation?

192.168.1.0:24
192.168.1.0/24
192.168.1.0\24
192.168.1.0 + 255.255.255.0

CIDR notation uses a forward slash and then lists the numbers of bits in the subnet mask.

Question 3

How many octets does a subnet mask have?

A subnet mask is the same length as an IP address.

The Network Layer

Question 1

Please select all of the valid IP addresses. Check all that apply.

123.456.123.456
192.168.1.1
8.8.8.8
257.70.312.49

Question 2

What happens to the TTL field of an IP datagram every time it reaches a router?

The TTL field is decremented by one.
The TTL field is reset to zero.
The TTL field is used for a cyclical redundancy check.
The TTL field is incremented by one.

At every router hop, the TTL field is decremented by one until it reaches zero, causing the datagram to be discarded.

Week 2 Graded Assessment

Week 3: The Transport and Application Layers quiz answers

In the third week of this course, we’ll explore the transport and application layers. By the end of this module, you’ll be able to describe TCP ports and sockets, identify the different components of a TCP header, show the difference between connection-oriented and connectionless protocols, and explain how TCP is used to ensure data integrity.

The Application Layer

Question 1

Unlike our five-layer model, the OSI network model adds two more layers on top of the Application Layer. Select examples of these new layers below.

The interconnection layer
The encryption layer
The presentation layer
The session layer
The compression layer

Question 2

An example of something that operates at the application layer is:

A router
TCP
A web browser
UDP

Web browsers and server operate at the application layer.

Question 3

What’s the standard number for a TTL field?

8
16
32
64

While this value can be set to anything from 0 to 255, 64 is the recommended standard.

The Transport Layer

Question 1

What ordering of TCP flags makes up the Three-way Handshake?

FIN, FIN/ACK, ACK
SYN, SYN/ACK, ACK
SYN, ACK, SYN, ACK
SYN, ACK, FIN

The computer that wants to establish a connection sends a packet with the SYN flag set. Then, the server responds with a packet with both the SYN and ACK flags set. Finally, the original computer sends a packet with just the ACK flag set.

Question 2

Transport layer protocols, like TCP and UDP, introduce the concept of a port. How many bits is a port field?

4 bits
8 bits
16 bits
32 bits

A TCP or UDP port is a 16-bit number, meaning there are theoretically 65,535 possible values it can have.

Question 3

Please select all valid TCP control flags.

WAIT
LISTEN
CLOSE
ACK
RST
URG

Question 4

A device that blocks traffic that meets certain criteria is known as a __.

Firewall
Router
Switch
Hub

A firewall is used to block certain defined types of traffic.

Week 3 Graded Assessment

Week 4: Networking Services quiz answers

In the fourth week of this course, we’ll explore networking services. We’ll learn about why we need DNS and how it works. We’ll also show you why DHCP makes network administration a simpler task. By the end of this module, you’ll be able to do describe how DNS and DHCP work, how NAT technologies help keep networks secure, and how VPNs and proxies help users connect and stay secured.

Dynamic Host Configuration Protocol

Question 1

What are the four things that all computers need configured in order to operate on a modern network? Check all that apply.

An NTP server
A TCP port
A name server
An IP address
A default gateway
A subnet mask
A MAC address

Question 2

When using Fixed Allocation DHCP, what’s used to determine a computer’s IP?

A record
Location
A MAC address
A subnet mask

Fixed Allocation DHCP ensures that computers receive an IP address reserved for it via its MAC address.

Question 3

The process by which a client configured to use DHCP attempts to get network configuration information is known as _____.

DHCP Discovery
DHCP Request
DHCP Offer
DHCP Acknowledgement

DHCP Discovery is how a client determines configuration information.

Name Resolution in Practice

Question 1

An A Record contains what?

A CNAME
An IPv4 address
An IPv6 address
A fully qualified domain name

Question 2

Select all that are true.

One domain name can point to one IP.
One domain name can point to many IPs.
Many domain names can point to the same IP.

Question 3

MX stands for __.

Micro extreme
Micro exchange
Mail exchange
Meta exchange

MX stands for mail exchange.

Question 4

A fully qualified domain name can contain how many characters?

63
64
127
255

An FQDN is limited to a total length of 255 characters.

Name Resolution

Question 1

What transport layer protocol does DNS normally use?

TCP
IP
ICMP
UDP

While DNS over TCP does exist, UDP is the most common protocol.

Question 2

A DNS TTL determines what?

How many steps there are in the resolution process
How far away a DNS can be from you
How many DNS resolutions can take place before the IP has to change
How long a DNS entry is allowed to be cached

TTL stands for Time to Live and determines how long a DNS entry can be cached.

Question 3

How many root servers are there?

There are 13 root servers.

Network Address Translation

Question 1

NAT addresses concerns over the dwindling IPv4 address space by _______.

allowing networks to use fewer IP addresses overall.
allowing users to move to IPv6 when they want.
allowing computers using non-routable address space to communicate with the Internet.
performing IP masquerading.

NAT allows networks to use non-routable address space for their internal devices.

Question 2

What technique allows for inbound traffic through a NAT?

Port preservation
Port forwarding
Port authority
Ephemeral ports

Port forwarding is a technique that allows for inbound traffic through a router configured to NAT.

Question 3

The total number of IPv4 addresses is approximately:

4.2 million
4.2 billion
4.2 trillion
Uncountable

There are approximately 4.2 billion IPv4 addresses.

VPNs & Proxies

Question 1

Two-factor authentication is_________________________.

a method where you need two passwords.
a method that requires two usernames.
a method where you authenticate twice.
a method where you need more than a username and a password.

Two-factor authentication requires a username/password and something extra.

Question 2

VPNs are known as a _ protocol.

connectionless
data link layer
tunneling
network layer

VPNs are tunneling protocols.

Question 3

A proxy is something that ___________.

sends data across a single network segment.
communicates on behalf of something else.
encrypts traffic sent across the Internet.
allows for many devices to speak to one other device.

While proxies are many things, they primarily communicate on behalf of something else.

Week 4 Graded Assessment

Week 5: Connecting to the Internet quiz answers

In the fifth week of this course, we’ll explore the history of the Internet, how it evolved, and how it works today. We’ll understand the different ways to connect to the Internet through cables, wireless and cellar connections, and even fiber connections. By the end of this module, you’ll be able to define the components of WANs and outline the basics of wireless and cellular networking.

Broadband Internet

Question 1

T1 is short for __.

Transportation System 1.
Transmission System 1.
Transportation 1.
Transmission 1.

T1 is short for Transmission System 1.

Question 2

How fast is a T1 line?

1.544 Mb/sec
44.763 Mb/sec
1 Mb/sec
128 Mb/sec

A T1 communicates at speeds of 1.544 Kb/sec.

Question 3

Select all statements that are true of cable internet connections.

They’re broadband connections.
They’re dial-up connections.
They’re shared bandwidth connections.
They’re wireless connections.

POTS and Dial-up

Question 1

Another term for POTS, or the Plain Old Telephone System, is ___.

Public Switched Telephone Network.
Phone Switched Transport Network.
Public Switched Telephone Exchange.
Public Available Telephone Network.
Public Available Telephone Exchange.

POTS and PSTN refer to the same thing.

Question 2

A baud rate is a measurement of the number of __________.

data segments that can be sent across a telephone line every second.
bits that can be sent across a telephone line every second.
bytes that can be sent across a telephone line every second.
packets that can be sent across a telephone line every second.

A baud rate is equivalent to bits per second.

WANs

Question 1

WAN stands for __.

Wide Area Network.
Wired Area Network.
Wireless Area Network.
Wireless Local Area Network.

WAN stands for Wide Area Network.

Question 2

In a WAN, the area between a demarcation point and the ISP’s core network is known as _.

an access point
a local loop
a Local Area Network
a local link

A local loop is the name for the area between a demarcation point and an ISP’s network.

Question 3

A point-to-point VPN is also known as a __.

site-to-site VPN
one-to-many VPN
port forwarding VPN
data link VPN

A point-to-point VPN can also be referred to as a site-to-site VPN.

Wireless Networking

Question 1

How many address fields does an 802.11 header have?

There are four different address fields in an 802.11 header.

Question 2

A wireless channel is __.

a portion of a frequency band.
a point-to-point wireless connection.
a collision domain.
an example of an ad-hoc network.

A channel represents a portion of a frequency band.

Question 3

Choose all of the frequencies that wireless networks typically operate on.

88Mhz
1.544Ghz
2.4Ghz
5Ghz

Week 5 Graded Assessment

Week 6: Troubleshooting and the Future of Networking quiz answers

Congratulations, you’ve made it to the final week in the course! In the last week of this course, we’ll explore the future of computer networking. We’ll also cover the practical aspects of troubleshooting a network using popular operating systems. By the end of this module, you’ll be able to detect and fix a lot of common network connectivity problems using tools available in Microsoft Windows, MacOS, and Linux operating systems.

Digging into DNS

Question 1

One of Level 3’s public DNS servers is __.

4.2.2.3
8.8.8.8
127.0.0.1
192.168.1.1

Level 3’s public DNS servers are 4.2.2.1 through 4.2.2.6

Question 2

A DNS resolver tool available on all major desktop operating systems is __.

host
tracert
ping
nslookup

nslookup is available by default on Windows, macOS, and Linux.

Question 3

The organization responsible for DNS at a global level is __.

Google
RFC
ICANN
IANA

ICANN is responsible for DNS at a global level.

IPv6

Question 1

An IPv6 address is how many bits long?

16
32
64
128

An IPv6 address is 128 bits long

Question 2

The very first field in an IPv6 header is the _.

data payload field
version field
source address field
traffic class field

This field is used to indicate what version of IP is being used.

Question 3

The IPv6 header field that indicates how many routers can forward a packet before it’s discarded is called the __.

next header field
router forward field
hop limit field
TTL

The hop limit field configures how many routers can try to forward a packet before it’s discarded.

The Cloud

Question 1

A piece of software that runs and manages virtual machines is known as a __.

cloud storage device
hypervisor
cloud computing device
virtual instance

A hypervisor manages many virtual instances running on a single host.

Question 2

Office 365 Outlook is an example of _.

IaaS
PaaS
FttH
SaaS

Office 365 Outlook is an example of Software as a Service (SaaS).

Question 3

A hybrid cloud is ____.

a combination of virtual hosts and virtual guests
a combination of a public cloud and a private cloud
a combination of a public cloud and hardware virtualization
a combination of a private cloud and a mesh network

A hybrid cloud runs some services on a cloud provider and some services in-house.

Verifying Connectivity

Question 1

The protocol used to communicate network errors is known as __.

Traceroute
UDP
ICMP
TCP

ICMP is used to communicate errors back to the client.

Question 2

The ping utility sends what message type?

Destination Network Unknown
Destination Network Unreachable
Echo Request
Echo Reply

By default, the ping utility sends an Echo Request ICMP message type.

Question 3

On Windows, one of the tools you can use to verify connectivity to a specific port is __.

nc (netcat)
Test-NetConnection
tracert
ping

Test-NetConnection lets you test many things, including connectivity to a specific port on a remote host.