Troubleshooting and the Future of Networking | Quiz with Answers

1. The ability for a protocol or program to determine that something went wrong is known as ________.
  redundancy
  data verification
  error detection
  data resilience 

Answer - error detection 

Explanation - Error detection is determining that an error occurred; error recovery is attempting to fix this error automatically.

2. While in an interactive nslookup session, you'd use the ______ keyword to change the DNS server you're using.
  server
  client
  FQDN
  DNS 

Answer - Server

Explanation - Issuing a server keyword, followed by a DNS server, will change what server you're using for resolution attempts.

3. The IPv6 loopback address is _____.
  127.0.0.1
  0000:0000:0000:0000:0000:0000:0000:0000
  0000:0000:0000:0000:0000:0000:0000:0001  

Answer -   0000:0000:0000:0000:0000:0000:0000:0001   

Explanation - The IPv6 loopback address is a great example of how IPv6 address compaction works.

4. PaaS stands for ______.
  Platform as a Service
  Packets as a Service
  Preamble as a Service
  Platform as a Schedule 

Answer -  Platform as a Service

Explanation - PaaS enables you to run applications without requiring an entire server to do so.

5. The equivalent of the TTL field in an IPv4 header is known as the ______ field in an IPv6 header.
  hop limit
  traffic class
  next header
  flow label 

Answer - hop limit

Explanation - The hop limit field corresponds to the IPv4 TTL field.

6. Traceroute uses UDP packets on which of the following operating systems? Check all that apply.

Mac OS

Linux

Windows 10

Windows 7 

Answer - Mac OS and Linux

Explanation - On Linux and macOS, traceroute sends UDP packets to very high port numbers. 

7. Most public Domain Name Servers (DNS) are available globally through which technology?

  Time To Live (TTL) field

  Anycast

  Hosts file

  Echo request 

Answer - Anycast

Explanation - Anycast is a method that pools servers to provide services as if it were a single system.

8. Which of these addresses is an Internet Protocol (IP) v4 loopback address?

  8.8.8.8

  192.168.1.1

  1.2.3.4

  127.0.0.1  

Answer - 127.0.0.1

Explanation - A loopback address points to itself and is used for troubleshooting purposes.

9. An Internet Protocol (IP) v6 address is how many bits in size?

  32

  128

  256

  64

Answer - 128

Explanation - IPv6 addresses are 128 bits compared to 32 bits of an IPv4 IP address.

10. Which Internet Protocol (IP) v6 header field is used to determine the quality of service level for a datagram?

  Version

  Flow label

  Payload length

  Next header 

Answer - Flow label

Explanation - The flow label field is used in conjunction with the traffic class field for routers, to make decisions about the quality of service level for a specific datagram.

11. Internet Protocol (IP) v6 addresses are written out in which format?

  8 groups of 12 bits

  4 groups of 16 bits

  6 groups of 32 bits

  8 groups of 16 bits  

Answer - 8 groups of 16 bits

Explanation - IPv6 addresses are usually written out as 8 groups of 16 bits each. Each of these groups is further made up of 4 hexadecimal digits.

12. For Internet Protocol (IP) v6 traffic to travel on an IP v4 network, which two technologies are used? Check all that apply.

IPv4 Tunnels

Packets

IPv6 tunnels

Datagrams  

Answer - IPV6 tunnels

Explanation - An IPv6 tunnel is used to encapsulate data between IPv6 tunnel servers.

13. What size is an Internet Protocol (IP) v6 payload field?

  8-bit

  20-bit

  16-bit

  32-bit 

Answer - 16-bit

Explanation - The payload length field is a 16-bit field that defines how long the data payload section of the datagram is. 

14. ICMP stands for ________.
  Internet Control Message Protocol
  Internet Client Message Protocol
  Interactive Control Message Protocol
  Internet Control Mail Protocol 

Answer -  Internet Control Message Protocol

Explanation - ICMP is used to deliver messages about network errors. 

15. One of Google's public DNS servers is 8.8.8.8. The other one is ______.
  0.0.0.0
  255.255.255.255
  8.8.4.4  

Answer - 8.8.4.4

Explanation - 8.8.8.8 and 8.8.4.4 are useful IPs to memorize when troubleshooting. 

16. An organization responsible for assigning individual domain names to other organizations or individuals is known as a(n) ______.
  DNS registrar
  internet authority
  autonomous system
  government  

Answer - DNS registrar

Explanation - You can use a registrar to register a domain name! 

17. IPv6 addresses beginning with FE80:: are used for ______.
  public multicast
  anycast
  Network Address Translation
  link local unicast  

Answer - link local unicast 

Explanation - Link-local unicast is used for IPv6 nodes to get their network configuration, much like DHCP.

18. The IPV4 mapped address space within IPv6 always starts with _______ zeroes.

  32

  64

  80

  128

Answer - 80

Explanation - 80 zeroes, followed by 16 ones, followed by the IPv4 address itself it how the IPv4 mapped address space works.

 19. You need to find the Internet Protocol (IP) address for a website. Which command do you use on a Windows system?
  pathping
  netcat
  ping
  nslookup 

Answer - nslookup

 Explanation - Using the nslookup command with a domain will return a host (A) record.

20. When using the netcat command to test a network port, which option will provide output that is not useful for scripting, but is useful for the human eye?
  No option is required
  -z
  -v
  -Port 

Answer -  -v 

 Explanation - The “-v” flag, which stands for verbose, is useful as it formats the command’s output to be readable to human eyes.

 21. A company runs sensitive technologies locally, while entrusting less-sensitive technologies to a broader user base. Which cloud delivery model is being used?

  Hybrid

  Private

  Public

  Community 

Answer - Hybrid

Explanation - A combination of cloud delivery models make up a hybrid type of deployment. In this case, both private and public models are being used.

22. Which two tools function similar to traceroute? Check all that apply.

mtr

netcat

pathping

nslookup 

Answer - mtr and pathping 

Explanation - The mtr command works in real time and will continually update its output with all of the current aggregate data. Pathping runs for 50 seconds and then displays the final aggregate data all at once. 

 23. When shortening an Internet Protocol (IP) v6 address, which two rules are used? Check all that apply.

Removing all leading zeros.

Replace groups of ones with semicolons.

Replace groups of zeros with colons.

Removing all leading ones. 

Answer - Removing all leading zeros and Replace groups of zeros with colons.

Explanation - When shortening an IPv6 address, you can remove any leading zeros from a group. Any number of consecutive groups composed of just zeroes can be replaced with two colons.

24. Following rules of compaction, the IPv6 address 2001:0db8:0000:0000:0000:ff00:0012:3456 could also be written as _______.

  21:db8::ff:12:3456
  2001:db8::ff00:12:3456
  ::1
  0000:0000:0000:0000:0000:0000:0000:0001 

Answer -  2001:db8::ff00:12:3456

Explanation - IPv6 address compaction is a great way to shorten IPv6 addresses. 

25. A support technician uses the ping utility on a system that is online, yet no response is received. What should be allowed through a firewall, for ping to operate correctly?
  ICMP
  TTL
  Echo request
  Echo reply  

Answer - ICMP

Explanation - The ping utility uses the Internet Control Message Protocol (ICMP). 

26. Unlike Linux and Mac systems, on a Windows system, the ping command sends how many echo requests?
  8
  4
  2
  12  

Answer - 4

Explanation - Linux and Mac systems send echo requests until the ping command is stopped. A Windows system sends only 4 echo requests by default.

 27. The first field of an Internet Control Message Protocol (ICMP) packet specifies the message type. Which choices represent message type examples? Check all that apply.

Time exceeded

Destination unreachable

Destination network unreachable

Destination port unreachable 

 

Answer -  Time exceeded 

 

Explanation - The type field specifies the message type. A code field further breaks down the message type to be more specific.