The Bits and Bytes of Computer Networking Coursera Quiz Answers

All Weeks The Bits and Bytes of Computer Networking Coursera Quiz Answers

Week 1: Introduction To Networking Quiz Answers

Quiz 01: The Data Link Layer

Q1. How many octets are there in a MAC address?

• 5
• 8
• 4
• 6

Q2. 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

Q3. 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

Quiz 02: Networking Devices

Q1. 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.

Q2. What does LAN stand for?

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

Q3. 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

Quiz 03: TCP/IP

Q1. Which of the following is an example of a network layer (layer 3) protocol?

• Ethernet
• IP
• UDP
• TCP

Q2. 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.

Q3. 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

Quiz 04: The Data Link Layer

Q1. How many octets are there in a MAC address?

• 5
• 8
• 4
• 6

Q2. 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

Q3. 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

Quiz 05: The Physical Layer

Q1. What is the type of modulation used by twisted pair cable computer networks known as?

• Line crimping
• Simplex communication
• Line coding
• RJ45

Q2. 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.

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The Bits and Bytes of Computer Networking Week 02 Quiz Answers

Quiz 01: Routing

Q1. Select examples of routing protocols. Check all that apply.

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

Q2. Who is permitted to use non-routable address space?

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

Q3. A typical routing table may contain which of the following? Check all that apply.

• Destination address
• Total hops
• Destination network
• TTL

Quiz 02: Subnetting

Q1. What does CIDR stand for?

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

Q2. 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

Q3. How many octets does a subnet mask have?

• 1
• 2
• 3
• 4

Quiz 03: The Network Layer

Q1. 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

Q2. 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.

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The Bits and Bytes of Computer Networking Week 03 Quiz Answers

Quiz 01: The Application Layer

Q1. 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

Q2. An example of something that operates at the application layer is:

• A router
• TCP
• A web browser
• UDP

Q3. What’s the standard number for a TTL field?

8
16
32
64

Quiz 02: The Transport Layer

Q1. 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

Q2. 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

Q3. Please select all valid TCP control flags.

• WAIT
• LISTEN
• CLOSE
• ACK
• RST
• URG

Q4. A device that blocks traffic that meets certain criteria is known as a __.

• Firewall
• Router
• Switch
• Hub

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The Bits and Bytes of Computer Networking Week 04 Quiz Answers

Quiz 01: Dynamic Host Configuration Protocol

Q1. 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

Q2. When using Fixed Allocation DHCP, what’s used to determine a computer’s IP?

• A record
• Location
• A MAC address
• A subnet mask

Q3. 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

Quiz 02: Name Resolution in Practice

Q1. An A Record contains what?

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

Q2. 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.

Q3. MX stands for __.

• Micro extreme
• Micro exchange
• Mail exchange
• Meta exchange

Q4. A fully qualified domain name can contain how many characters?

• 63
• 64
• 127
• 255

Quiz 03: Name Resolution

Q1. What transport layer protocol does DNS normally use?

• TCP
• IP
• ICMP
• UDP

Q2. 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

Q3. How many root servers are there?

• 8
• 13
• 16
• 17

Quiz 04:Network Address Translation

Q1. 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.

Q2. What technique allows for inbound traffic through a NAT?

• Port preservation
• Port forwarding
• Port authority
• Ephemeral ports

Q3. The total number of IPv4 addresses is approximately:

• 4.2 million
• 4.2 billion
• 4.2 trillion
• Uncountable

Quiz 05: VPNs & Proxies

Q1. 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.

Q2. VPNs are known as a _ protocol.

• connectionless
• data link layer
• tunneling
• network layer

Q3. 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.

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The Bits and Bytes of Computer Networking Week 05 Quiz Answers

Quiz 01: Broadband Internet

Q1. T1 is short for __.

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

Q2. How fast is a T1 line?

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

Q3. 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.

Quiz 02:POTS and Dial-up

Q1. 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.

Q2. 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.

Quiz 03: WANs

Q1. WAN stands for __.

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

Q2. 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

Q3. A point-to-point VPN is also known as a __.

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

Quiz 04: Wireless Networking

Q1. How many address fields does an 802.11 header have?

• 1
• 2
• 3
• 4

Q2. 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

Q3. Choose all of the frequencies that wireless networks typically operate on.

• 88Mhz
• 1.544Ghz
• 2.4Ghz
• 5Ghz

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The Bits and Bytes of Computer Networking Week 06 Quiz Answers

Quiz 01: Digging into DNS

Q1. 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

Q2. A DNS resolver tool available on all major desktop operating systems is __.

• host
• tracert
• ping
• nslookup

Q3. The organization responsible for DNS at a global level is __.

• Google
• RFC
• ICANN
• IANA

Quiz 02: IPv6

Q1. An IPv6 address is how many bits long?

• 16
• 32
• 64
• 128

Q2. The very first field in an IPv6 header is the _.

• data payload field
• version field
• source address field
• traffic class field

Q3. 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

Quiz 03: The Cloud

Q1. A piece of software that runs and manages virtual machines is known as a __.

• cloud storage device
• hypervisor
• cloud computing device
• virtual instance

Q2. Office 365 Outlook is an example of _.

• IaaS
• PaaS
• FttH
• SaaS

Q3. 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

Quiz 04: Verifying Connectivity

Q1. The protocol used to communicate network errors is known as __.

• Traceroute
• UDP
• ICMP
• TCP

Q2. The ping utility sends what message type?

• Destination Network Unknown
• Destination Network Unreachable
• Echo Request
• Echo Reply

Q3. On Windows, one of the tools you can use to verify connectivity to a specific port is __.

• nc (netcat)
• Test-NetConnection
• tracert
• ping

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There are 5 Courses in Google IT Support Professional Certificate

Course 1: Technical Support Fundamentals

Course 2: The Bits and Bytes of Computer Networking

Course 3: Operating Systems and You: Becoming a Power User

Course 4: System Administration and IT Infrastructure Services

Course 5: IT Security: Defense against the digital dark arts