MD-100 100: Network Configuration 3 — Questions and Answers
Question 1: A Windows 10 user reports that websites load by IP address but not by hostname. Which service is most likely failing?
- DNS (Correct answer)
- DHCP
- WINS
- NetBIOS
Correct answer: DNS
DNS translates hostnames to IP addresses; if it fails, names cannot be resolved even though IP connectivity works.
Question 2: Which command displays the current DNS cache on a Windows 10 machine?
- ipconfig /displaydns (Correct answer)
- ipconfig /flushdns
- nslookup /cache
- netsh dns show cache
Correct answer: ipconfig /displaydns
ipconfig /displaydns shows all currently cached DNS entries on the local machine.
Question 3: A Windows 10 PC cannot communicate with any device on the local network. The IP address is correct but the subnet mask is 255.255.255.255. What is the effect?
- The PC treats every host as being on a different network, preventing local communication (Correct answer)
- Only internet traffic is blocked while LAN traffic works
- DNS will fail but DHCP will still function
- The gateway becomes unreachable but local hosts remain accessible
Correct answer: The PC treats every host as being on a different network, preventing local communication
A /32 subnet mask (255.255.255.255) means the device sees itself as the only host on its network, isolating it from all others.
Question 4: Which Windows 10 tool provides a graphical view of network adapter settings, including speed, duplex, and driver details?
- Device Manager (Correct answer)
- Network and Sharing Center
- Resource Monitor
- Task Manager Networking tab
Correct answer: Device Manager
Device Manager shows detailed hardware properties including driver version, speed, and duplex settings for network adapters.
Question 5: A Windows 10 PC is configured with DNS server 8.8.8.8. What does this indicate about the DNS configuration?
- The PC is using Google's public DNS server (Correct answer)
- The PC is using the ISP's DNS server
- The PC is using a corporate internal DNS server
- The PC has no DNS server configured
Correct answer: The PC is using Google's public DNS server
8.8.8.8 is Google's well-known public DNS resolver, often used to bypass ISP or corporate DNS issues.
Question 6: Which netsh command resets the TCP/IP stack to a clean state on Windows 10?
- netsh int ip reset (Correct answer)
- netsh winsock reset
- netsh interface reset all
- netsh tcp reset stack
Correct answer: netsh int ip reset
netsh int ip reset rewrites TCP/IP registry entries to their default state, resolving corruption issues.
Question 7: A Windows 10 device connects to the network but cannot reach resources on a remote subnet. Local hosts are accessible. What is the most likely misconfiguration?
- The default gateway is missing or incorrect (Correct answer)
- The subnet mask is incorrect
- DNS is not configured
- The DHCP server is offline
Correct answer: The default gateway is missing or incorrect
The default gateway is required to route traffic to remote subnets; without it, only local subnet communication works.
MD-100 100: Network Configuration 3
A Windows 10 user reports that websites load by IP address but not by hostname.
Which service is most likely failing?