Module 6 challenge: Troubleshooting and the Future of Networking: The Bits and Bytes of Computer Networking (Technical Support Fundamentals) Answers 2025

Question 1

What is one type of built-in protocol mechanism?

✅ Time to Live (TTL) expiration
❌ Misconfiguration error
❌ IPv6
❌ Error detection

Explanation:
TTL (Time to Live) is a built-in IP mechanism that limits how long a packet can circulate on a network before being discarded.

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Question 2

The first field of an ICMP packet specifies the message type. Which choices represent message type examples?

✅ Time exceeded
✅ Destination unreachable
❌ HTTP 404 Not Found
❌ ARP request failed

Explanation:
ICMP messages like Destination Unreachable and Time Exceeded report network errors. The others are from unrelated protocols.

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Question 3

Which two tools function similar to traceroute?

✅ Mtr
✅ pathping
❌ netcat
❌ Nslookup

Explanation:
Mtr and pathping show the route and latency of packets, similar to traceroute.

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Question 4

A tech uses the netcat tool on a Linux system. Which has proper syntax?

✅ nc google.com 80
❌ nc google.com -z
❌ nc google.com
❌ nc -v 80

Explanation:
The correct command format for connecting to a host and port is:
nc <hostname> <port>

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Question 5

You need to find the IP address for a website. Which command do you use on Windows?

✅ Nslookup
❌ Pathping
❌ Ping
❌ Netcat

Explanation:
nslookup is used to query DNS servers for the IP address of a domain name.

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Question 6

When troubleshooting DNS problems, which helpful feature do public servers usually support?

✅ ICMP echo requests
❌ Virtualization services
❌ Paths between nodes
❌ Port connectivity

Explanation:
Most public DNS servers respond to ICMP echo requests (pings), allowing you to verify network connectivity.

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Question 7

With virtualization, a single physical machine, called a host, can run many individual virtual instances, called ______.

✅ Guests
❌ Clients
❌ Clouds
❌ Servers

Explanation:
Each virtual machine running on a host is known as a guest.

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Question 8

An IPv6 address is how many bits in size?

✅ 128
❌ 32
❌ 64
❌ 256

Explanation:
IPv6 addresses are 128 bits long, allowing for a vastly larger address space than IPv4.

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Question 9

Which is the most fully compressed version of 7d2b:00a9:a0c4:0000:a772:00fd:a523:0358?

✅ 7d2b:a9:a0c4:0:a772:fd:a523:358
❌ 7d2b:a9:a0c4:0:a772:fd:a523
❌ 7d2b:00a9:a0c4:0000:a772
❌ 7d2b:a9:a0c4::a772:fd:a523:358

Explanation:
Leading zeros are removed, and a single “0” replaces the “0000” block.
“::” can only replace multiple zero blocks, not just one.

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Question 10

Which IPv6 header field is used to determine the quality of service level for a datagram?

✅ Flow label
❌ Version
❌ Next header
❌ Payload length

Explanation:
The Flow Label field in IPv6 allows routers to identify and prioritize packets belonging to the same flow for Quality of Service (QoS).

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