MCQs

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Overall MCQs for Reference

1. What does an “Unknown Host” error typically indicate in server technology?
   a. Router misconfiguration
   b. DNS could not resolve the hostname
   c. Low disk space
   d. High CPU usage
   Answer: b. DNS could not resolve the hostnametechdogs
2. Which network tool often reports “Unknown Host” when it cannot resolve a hostname?
   a. traceroute
   b. ipconfig
   c. ping
   d. netstat
   Answer: c. pinglabex
3. A server attempts to connect to another via hostname, but receives “Unknown Host.” Which is the first area to check?
   a. RAM size
   b. Host file entries
   c. Power supply
   d. Video card
   Answer: b. Host file entriescwiki.apache
4. On UNIX systems, where are static hostname mappings stored that could affect “Unknown Host” errors?
   a. /var/log/hostnames
   b. /etc/hosts
   c. /usr/local/hostmap
   d. /tmp/hostlist
   Answer: b. /etc/hostscwiki.apache
5. What is the primary protocol involved in hostname resolution in server technology?
   a. HTTP
   b. FTP
   c. DNS
   d. DHCP
   Answer: c. DNStestbook
6. Which type of error would you see if a Java application can’t resolve a hostname?
   a. DNSException
   b. FileNotFoundException
   c. UnknownHostException
   d. NetworkException
   Answer: c. UnknownHostExceptionsanfoundry
7. What command can help verify if a DNS entry exists for a hostname?
   a. ping
   b. nslookup
   c. ipconfig
   d. ifconfig
   Answer: b. nslookupcwiki.apache
8. You get an “Unknown Host” error while trying to SSH to a server. Which step should be performed first?
   a. Restart server
   b. Check hostname spelling
   c. Update browser
   d. Send ARP packets
   Answer: b. Check hostname spellingcwiki.apache
9. In a web application, “Unknown Host” may appear if the server lacks what information?
   a. Network mask
   b. DNS entry for the hostname
   c. NTP configuration
   d. SSL certificate
   Answer: b. DNS entry for the hostnamewfo.verintcloudservices
10. What could firewalls potentially block, causing “Unknown Host” errors?
    a. DNS packets
    b. HTTP packets
    c. SMTP packets
    d. SNMP traps
    Answer: a. DNS packetswfo.verintcloudservices
11. Which diagnostic tool can help determine if the issue is with DNS or the server hardware?
    a. netstat
    b. nslookup
    c. tasklist
    d. route print
    Answer: b. nslookupcwiki.apache
12. In distributed computing, “Unknown Host” errors may suggest what kind of misconfiguration?
    a. Insufficient bandwidth
    b. Incorrect hostname or missing DNS entry
    c. Overloaded CPU
    d. Old hard disks
    Answer: b. Incorrect hostname or missing DNS entrycwiki.apache
13. When using browser-based management tools, what protocol is often used to test connectivity that could report “Unknown Host”?
    a. HTTP
    b. FTP
    c. SNMP
    d. TFTP
    Answer: a. HTTPwfo.verintcloudservices
14. Which network configuration file often solves “Unknown Host” issues by adding hostname to IP mappings?
    a. /etc/network/interfaces
    b. /etc/hosts
    c. /etc/resolv.conf
    d. /etc/sysconfig/network
    Answer: b. /etc/hostscwiki.apache
15. What is usually missing when an “Unknown Host” error occurs in URL-based database connections?
    a. Database username
    b. Correct server hostname
    c. Encryption key
    d. Port number
    Answer: b. Correct server hostnamedigitalocean
16. DNS uses which protocol to exchange zone information between servers?
    a. TCP
    b. UDP
    c. FTP
    d. SMTP
    Answer: a. TCPtestbook
17. DNS uses which protocol when resolving a hostname to an IP address for clients?
    a. TCP
    b. UDP
    c. ICMP
    d. ARP
    Answer: b. UDPtestbook
18. Which of the following can directly cause “Unknown Host” errors?
    a. Typo in hostname
    b. Weak password
    c. Physical disk failure
    d. High memory usage
    Answer: a. Typo in hostnameedurev+1
19. Which OS-level utility helps you check if the “Unknown Host” error is due to missing /etc/hosts mappings?
    a. vi
    b. cat
    c. grep
    d. all of the mentioned
    Answer: d. all of the mentionedcwiki.apache
20. Which server role is most critical for resolving hostnames in enterprise environments?
    a. DHCP
    b. DNS
    c. SMTP
    d. LDAP
    Answer: b. DNStestbook
21. An “Unknown Host” message implies the network stack has failed to perform which operation?
    a. Hostname to IP translation
    b. Service authentication
    c. Firewall rule verification
    d. Packet routing
    Answer: a. Hostname to IP translationtechdogs+1
22. Which configuration detail is required in the hosts file for hostname resolution?
    a. IP address and hostname
    b. Subnet mask
    c. MAC address
    d. VLAN ID
    Answer: a. IP address and hostnamecwiki.apache
23. If a client gets “Unknown Host,” but others connect fine, what’s a likely cause?
    a. Local cache issue
    b. CPU overheating
    c. Hardware RAID misconfiguration
    d. Backup script failure
    Answer: a. Local cache issuetestbook
24. What is the recommended action if a managed server reports “Unknown Host” in Enterprise Manager software?
    a. Reboot all servers
    b. Verify and correct the hostname entered
    c. Delete all logs
    d. Format the disk
    Answer: b. Verify and correct the hostname enteredwfo.verintcloudservices
25. Which layer of the OSI model typically deals with hostname resolution?
    a. Physical
    b. Data link
    c. Application
    d. Presentation
    Answer: c. Applicationlabex
26. What information does the “Unknown Host Exception” indicate in Java networking?
    a. Hostname cannot be resolved
    b. File cannot be found
    c. Port is busy
    d. Server is overloaded
    Answer: a. Hostname cannot be resolvededurev+1
27. Which troubleshooting step is most effective for resolving “Unknown Host” in larger server clusters?
    a. Use caching DNS servers
    b. Reset server hardware
    c. Unplug and replug cables
    d. Increase RAM
    Answer: a. Use caching DNS serverscwiki.apache
28. What type of DNS server provides temporary store of DNS records to speed up resolution?
    a. Authoritative DNS server
    b. DNS cache server
    c. DHCP server
    d. File server
    Answer: b. DNS cache servertestbook
29. Which is not a direct cause of “Unknown Host” errors?
    a. Misspelled hostname
    b. DNS server unavailable
    c. Full disk
    d. Hosts file missing an entry
    Answer: c. Full diskedurev+1
30. “Unknown Host” errors indicate failures at which stage of connectivity?
    a. Data transmission
    b. Hostname lookup
    c. Disk access
    d. Authentication
    Answer: b. Hostname lookuplabex+1
31. On Windows, which file could be edited to resolve “Unknown Host” errors?
    a. win.ini
    b. hosts
    c. registry
    d. config.sys
    Answer: b. hostsdell
32. A “ping: unknown host” error implies issues with what?
    a. Network bandwidth
    b. Hostname resolution
    c. Wi-Fi standards
    d. Antivirus configuration
    Answer: b. Hostname resolutionlabex
33. What is the effect of a missing DNS entry for a server hostname?
    a. Connection refused
    b. Unknown Host error
    c. Slow file transfer
    d. HTTP 500 error
    Answer: b. Unknown Host errordigitalocean+1
34. In what scenario will configuring a firewall fix “Unknown Host” errors?
    a. When firewall blocks DNS traffic
    b. When firewall blocks HTTP traffic
    c. When firewall blocks SMTP traffic
    d. When firewall blocks SSH traffic
    Answer: a. When firewall blocks DNS trafficreddit+1
35. Which technology must be functional for name-to-IP translation to work?
    a. DHCP
    b. DNS
    c. RAID
    d. NTP
    Answer: b. DNStestbook
36. When managing virtual machines, what else should be checked besides networking when encountering “Unknown Host”?
    a. VM hostname settings
    b. Storage capacity
    c. Number of CPU cores
    d. Licensing
    Answer: a. VM hostname settingsdynatrace
37. Which configuration file in Hadoop can cause “Unknown Host” errors if incorrect?
    a. core-site.xml
    b. mapred-site.xml
    c. hadoop-env.sh
    d. yarn-site.xml
    Answer: a. core-site.xmlcwiki.apache
38. Which type of DNS server stores authoritative records?
    a. Recursive
    b. Cache
    c. Authoritative
    d. Forwarding
    Answer: c. Authoritativetestbook
39. An “Unknown Host” error in Minecraft servers is due to which technical issue?
    a. Minecraft version mismatch
    b. Hostname resolution failure
    c. Incorrect block ID
    d. Network latency
    Answer: b. Hostname resolution failurediscourse.cubecoders+1
40. Which common non-technical cause can sometimes result in “Unknown Host” errors?
    a. Typographical error
    b. Poor handwriting
    c. Outdated hardware
    d. Incompatible peripherals
    Answer: a. Typographical errorcwiki.apache
41. If “Unknown Host” errors persist after correcting hostnames and configuring /etc/hosts, what is the next step?
    a. Restart DNS service
    b. Replace RAM
    c. Update browser
    d. Clean malware
    Answer: a. Restart DNS servicecwiki.apache
42. What is a best practice for preventing “Unknown Host” issues in a large data center?
    a. Use both DNS and hosts files for redundancy
    b. Only use hosts files
    c. Only use local DNS
    d. Avoid hostname usage
    Answer: a. Use both DNS and hosts files for redundancycwiki.apache
43. What return code or exception does Java throw when a host cannot be resolved?
    a. IOException
    b. UnknownHostException
    c. NullPointerException
    d. URISyntaxException
    Answer: b. UnknownHostExceptionsanfoundry
44. What happens if a server has a correct IP but a misspelled hostname in its configuration files?
    a. Unknown Host error
    b. Network authentication fails
    c. Power loss warning
    d. Disk failure
    Answer: a. Unknown Host errorcwiki.apache
45. Which network layer protocol facilitates the initial hostname queries that could result in “Unknown Host”?
    a. ARP
    b. DNS
    c. IP
    d. PPP
    Answer: b. DNStestbook
46. If a server cannot be found on the network, but IP-based access works, what’s most likely the problem?
    a. Hostname resolution
    b. Disk failure
    c. Power surge
    d. Server under heavy load
    Answer: a. Hostname resolutiontechdogs
47. Which troubleshooting command helps confirm hostnames are resolving correctly in Linux?
    a. nslookup
    b. ls
    c. pwd
    d. cat
    Answer: a. nslookupcwiki.apache
48. Which combination causes “Unknown Host” most frequently in server technology?
    a. Misspelled hostnames and missing DNS entries
    b. Bad hard drives and memory leaks
    c. Thermal shutdown and CPU throttling
    d. Faulty graphics cards and USB drivers
    Answer: a. Misspelled hostnames and missing DNS entriesedurev+1
49. In cloud server environments, what is a frequent cause of “Unknown Host”?
    a. DNS propagation delay
    b. RAID level mismatch
    c. CPU virtualization
    d. Storage deduplication
    Answer: a. DNS propagation delaydigitalocean
50. Which user action typically resolves an “Unknown Host” error fastest if DNS fails?
    a. Add correct entry to local hosts file
    b. Reinstall network drivers
    c. Increase bandwidth
    d. Replace motherboard
    Answer: a. Add correct entry to local hosts filecwiki.apache

1. https://www.techdogs.com/td-dictionary/word/unknown-host
2. https://labex.io/tutorials/nmap-how-to-troubleshoot-ping-unknown-host-error-in-cybersecurity-417606
3. https://cwiki.apache.org/confluence/display/HADOOP2/unknownhost
4. https://testbook.com/objective-questions/mcq-on-dns–5eea6a0939140f30f369d8ff
5. https://www.sanfoundry.com/advanced-java-questions-answers-client-server/
6. https://wfo.f2.verintcloudservices.com/OnlineHelp_en/emt/rec_EM_EM_Config_Admin_Guide/rec_EM_Error_Message_Indicates_Unknown_Host.htm
7. https://docs.digitalocean.com/support/how-do-i-fix-the-unknown-host-error-when-connecting-to-mysql/
8. https://edurev.in/t/433556/Summary-Unknown-Host-Exception–Computer-Science
9. https://www.dell.com/support/kbdoc/en-in/000027539/avamar-administrator-fails-to-connect-with-unknown-host-due-to-incorrect-windows-hosts-file-permissions
10. https://www.reddit.com/r/Minecraft/comments/12dlvoy/failed_to_connect_to_the_server_unknown_host/
11. https://community.dynatrace.com/t5/Open-Q-A/Vmware-Dynatrace-Unknown-host/m-p/226035
12. https://discourse.cubecoders.com/t/minecraft-friend-cannot-connect-to-server-and-receives-unknown-host-error/20710
13. https://www.sanfoundry.com/computer-networks-questions-answers-dns/
14. https://testbook.com/objective-questions/mcq-on-internet–5eea6a1639140f30f369f54c
15. https://stackoverflow.com/questions/22967035/how-to-overcome-unknown-host-exception-with-no-access-to-system32-drivers-etc-ho
16. https://www.gdcramban.in/MCQ/networkmcq.pdf
17. https://mcqss.com/windows-server-mcq
18. https://www.scribd.com/document/252481970/Multiple-Choice-Questions
19. https://www.yeahhub.com/multiple-choice-questions-answers-windows-explanation/
20. https://www.checkupdown.com/http-status-error-001/