MCQs

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1. Which command is commonly used to check the status of a network interface on a Cisco switch?
   a. show ip route
   b. show interfaces status
   c. show vlan brief
   d. show running-config
   Answer: b. show interfaces statuscisco
2. What does the “down” status indicate on an Ethernet interface?
   a. Interface is administratively disabled
   b. Interface is overloaded
   c. Interface is actively passing traffic
   d. Interface is in promiscuous mode
   Answer: a. Interface is administratively disabledcisco
3. Which command displays the operational status and configuration of a network interface on Linux?
   a. show interfaces
   b. ipconfig
   c. ifconfig
   d. ping
   Answer: c. ifconfigplacementpreparation
4. What color is typically shown in “show interfaces status” for a port in the “notconnect” state on Cisco switches?
   a. Green
   b. Amber
   c. Blue
   d. No color assigned
   Answer: b. Ambercisco
5. Which component is most likely at fault if the interface shows “err-disabled”?
   a. Cable is unplugged
   b. VLAN not assigned
   c. Port security violation
   d. DHCP misconfiguration
   Answer: c. Port security violationcisco
6. What does the “admin down” status mean for a network port?
   a. The port is enabled by default
   b. The port is administratively shut down
   c. The port is experiencing collisions
   d. The port is operating in half-duplex
   Answer: b. The port is administratively shut downcisco
7. Which network command is used to determine the MAC address of a network interface on Windows?
   a. show mac-address-table
   b. ipconfig /all
   c. ping localhost
   d. arp -a
   Answer: b. ipconfig /allplacementpreparation
8. What action is required to bring a Cisco interface from “down” to “up” after a shutdown?
   a. Issue ping command
   b. Use the no shutdown command
   c. Reboot the switch
   d. Enable spanning-tree
   Answer: b. Use the no shutdown commandcisco
9. The primary function of the “show interfaces” command is to:
   a. Display routing tables
   b. Show port utilization and status
   c. Show VLAN membership
   d. Display user login attempts
   Answer: b. Show port utilization and statuscisco+1
10. What does a “line protocol down” message indicate on a router?
    a. Physical cable unplugged
    b. Protocol misconfigured or remote device issue
    c. Normal interface operation
    d. Hardware failure in switch
    Answer: b. Protocol misconfigured or remote device issuejuniper
11. Which of the following can cause a network interface to remain inactive?
    a. Incorrect duplex settings
    b. Normal operation
    c. Proper IP address assignment
    d. Correct VLAN mapping
    Answer: a. Incorrect duplex settingsnetworklessons
12. What command checks IPv4 configuration for an interface in Windows?
    a. ifconfig
    b. ipconfig
    c. traceroute
    d. route print
    Answer: b. ipconfigplacementpreparation
13. In Juniper devices, which status means the physical link is up but the protocol is not established?
    a. up/up
    b. up/down
    c. down/down
    d. admin down
    Answer: b. up/downjuniper
14. What does the “show running-config interface” command reveal?
    a. Routing table details
    b. Real-time interface configuration
    c. Password security settings
    d. User MAC addresses
    Answer: b. Real-time interface configurationcisco+1
15. A network interface with “input errors” in its status likely has:
    a. Cable unplugged
    b. Malfunctioning hardware or noise
    c. Correct cabling
    d. Active firewall rules
    Answer: b. Malfunctioning hardware or noisecisco
16. What status is displayed for a switch port with no cable attached?
    a. up
    b. down
    c. err-disabled
    d. listening
    Answer: b. downcisco+1
17. In the output of “show interfaces status”, what does “disabled” mean?
    a. The port is enabled
    b. A device is connected
    c. The interface is administratively shut down
    d. Traffic is flowing
    Answer: c. The interface is administratively shut downcisco+1
18. Which type of interface error is represented by high CRC error counts?
    a. Software misconfiguration
    b. Physical layer problems
    c. VLAN mis-assignment
    d. DHCP exhaustion
    Answer: b. Physical layer problemscisco
19. What status does a “no shutdown” command set for an interface?
    a. err-disabled
    b. admin down
    c. interface up (enabled)
    d. notconnect
    Answer: c. interface up (enabled)cisco
20. What command helps verify if an interface is part of a specific VLAN?
    a. show port-security
    b. show interfaces status
    c. show vlan brief
    d. show ip route
    Answer: c. show vlan briefcisco
21. What do high “output errors” indicate on a network interface status?
    a. Successful transmission
    b. Issues with outgoing transmissions
    c. Regular broadcast traffic
    d. No devices connected
    Answer: b. Issues with outgoing transmissionscisco
22. Which cable type, if faulty, can cause an interface to appear as “down”?
    a. Optical fiber
    b. Shielded twisted pair
    c. Coaxial cable
    d. All of the above
    Answer: d. All of the abovejuniper+1
23. What is a common cause for an interface status showing “blocking”?
    a. Spanning tree configuration
    b. Port security disabled
    c. MAC address mismatch
    d. Firewall policy applied
    Answer: a. Spanning tree configurationcisco
24. Which layer of the OSI model does the physical interface status correspond to?
    a. Application layer
    b. Physical layer
    c. Transport layer
    d. Network layer
    Answer: b. Physical layerplacementpreparation+1
25. On Cisco IOS, which command lists all interfaces that are in the “err-disabled” state?
    a. show vlan brief
    b. show interfaces status err-disabled
    c. show mac address-table
    d. show spanning-tree
    Answer: b. show interfaces status err-disabledcisco
26. What sh flogi command is used for?
    a. Checking routing tables
    b. Checking Fibre Channel interface login status
    c. Checking spanning tree status
    d. Checking broadcast storm
    Answer: b. Checking Fibre Channel interface login statuscisco
27. What is the significance of “operational status” on a Windows network adapter?
    a. Shows if interface is up or down
    b. Shows broadcast domain
    c. Shows IP route configuration
    d. Shows MAC table
    Answer: a. Shows if interface is up or downplacementpreparation
28. Which status indicates both device hardware and link are functioning?
    a. up
    b. down
    c. notconnect
    d. disabled
    Answer: a. upcisco+1
29. What does “notconnect” mean on a Cisco switch port status?
    a. Port is disabled administratively
    b. No device is connected or link failure
    c. Port is actively forwarding packets
    d. Port is in spanning-tree blocking state
    Answer: b. No device is connected or link failurecisco
30. The “connected” status in “show interfaces status” means:
    a. The port is administratively down
    b. The port is receiving traffic from another device
    c. The port is not assigned to a VLAN
    d. The interface has no IP address assigned
    Answer: b. The port is receiving traffic from another devicecisco
31. What does “show hardware internal debug-info interface” help with?
    a. Debugging interface errors at hardware level
    b. Displaying user configuration
    c. Checking spanning tree timers
    d. Viewing VLAN memberships
    Answer: a. Debugging interface errors at hardware levelcisco
32. Which output field in “show interfaces” indicates speed and duplex status?
    a. IP address
    b. Speed/Duplex
    c. MAC address
    d. Output queue
    Answer: b. Speed/Duplexcisco+1
33. The “show ip interface brief” command is used to:
    a. Configure port description
    b. Display summary information about IP status of interfaces
    c. Create VLANs
    d. Troubleshoot OSPF status
    Answer: b. Display summary information about IP status of interfacescisco
34. What is indicated by a “protocol down, line up” status?
    a. Remote protocol mismatch or disabled
    b. Cable not attached
    c. VLAN misassigned
    d. MAC address conflict
    Answer: a. Remote protocol mismatch or disabledjuniper
35. High “collision” counts in interface statistics normally indicate:
    a. Full duplex mode
    b. Half duplex and network congestion
    c. Routing error
    d. Redundant link
    Answer: b. Half duplex and network congestionjuniper+1
36. Which status means an interface is enabled but not passing user data due to logical blocking?
    a. disabled
    b. err-disabled
    c. blocking
    d. forwarding
    Answer: c. blockingcisco
37. On which OSI layer does the status of MAC addresses get maintained?
    a. Network
    b. Physical
    c. Data Link
    d. Application
    Answer: c. Data Linksanfoundry
38. Why might an interface show “admin down” status in Juniper or Cisco systems?
    a. Device is physically damaged
    b. Interface is disabled in configuration
    c. No MAC address is assigned
    d. Used for link aggregation
    Answer: b. Interface is disabled in configurationjuniper+1
39. Which command is essential for discovering interface errors, discards, or CRC problems?
    a. show mac address-table
    b. show interfaces counters errors
    c. show ip route
    d. show spanning-tree summary
    Answer: b. show interfaces counters errorscisco+1
40. In network troubleshooting, what does a “down/down” status normally alert the technician to first?
    a. Administrative shutdown
    b. Physical connectivity issues
    c. Broadcast storm
    d. Spanning-tree loop detected
    Answer: b. Physical connectivity issuesjuniper+1
41. What does the “show interfaces” output header “Last input” mean?
    a. Time since interface was reenabled
    b. Time since last traffic was received
    c. Time since last error occurred
    d. Time since last spanning tree recalculation
    Answer: b. Time since last traffic was receivedcisco
42. Which protocol regularly monitors interface status and can trigger failover in high availability designs?
    a. OSPF
    b. VRRP
    c. RIP
    d. BGP
    Answer: b. VRRPcisco
43. What does an interface status of “inactive” mean in Junos OS?
    a. Hardware fault detected
    b. Interface not assigned to a logical unit or family
    c. Device is not configured correctly
    d. IP address conflict
    Answer: b. Interface not assigned to a logical unit or familyjuniper
44. Which command shows both the physical and logical status of interfaces in Cisco IOS?
    a. show interfaces
    b. show version
    c. show filesystems
    d. show running-config
    Answer: a. show interfacescisco+1
45. Which interface status is typically shown during a port security violation?
    a. up/up
    b. err-disabled
    c. notconnect
    d. admin down
    Answer: b. err-disabledcisco
46. What does the “duplex mismatch” status indicate in interface troubleshooting?
    a. Interface is operating normally
    b. One device is set to full duplex, another to half duplex
    c. VLAN tag not recognized
    d. MAC address conflict
    Answer: b. One device is set to full duplex, another to half duplexnetworklessons+1
47. For what reason would an interface status show “reset” on Cisco IOS?
    a. Device is upgrading firmware
    b. Interface is being restarted after an error
    c. Spanning tree is blocking the port
    d. OSPF adjacency is forming
    Answer: b. Interface is being restarted after an errorcisco
48. Why might a port on a switch transition from “up” to “down” frequently?
    a. Flapping cable, intermittent hardware, or remote shutdown
    b. Proper link negotiation
    c. Correct VLAN membership
    d. No spanning tree configured
    Answer: a. Flapping cable, intermittent hardware, or remote shutdownjuniper+1
49. What could cause a “line protocol down” status when the hardware status is “up”?
    a. Remote side misconfigured or disconnected
    b. Cable mismatch
    c. VLAN association conflict
    d. Interface is disabled by administrator
    Answer: a. Remote side misconfigured or disconnectedjuniper
50. What tool is typically used for monitoring real-time interface status and utilization?
    a. Traceroute
    b. SNMP monitoring software
    c. FTP client
    d. Web proxy server
    Answer: b. SNMP monitoring softwarecisco

1. https://www.cisco.com/c/en/us/support/docs/switches/catalyst-6500-series-switches/12027-53.html
2. http://www.cisco.com/en/US/docs/storage/san_switches/mds9000/sw/rel_3_x/troubleshooting/guide/ts_port.html
3. https://www.placementpreparation.io/mcq/computer-network/
4. https://www.placementpreparation.io/mcq/computer-network/page/2/
5. https://www.juniper.net/documentation/us/en/software/junos/interfaces-fundamentals/topics/topic-map/troubleshooting-interfaces.html
6. https://networklessons.com/switching/troubleshooting-interfaces
7. https://www.sanfoundry.com/computer-networks-questions-answers-data-link-layer/
8. https://www.interviewbit.com/computer-network-mcq/
9. https://www.uninets.com/blog/computer-networks-mcq
10. https://www.gdcramban.in/MCQ/networkmcq.pdf
11. https://testbook.com/objective-questions/mcq-on-networking–5eea6a1639140f30f369f551
12. https://www.scribd.com/document/528059156/Network-Review
13. https://www.scribd.com/document/507960859/Computer-Network-MCQ-ANSWERS
14. https://www.watelectronics.com/mcq/network-interface-card/
15. https://reck.ac.in/wp-content/uploads/2023/04/DCN_MCQ-Ashwini-.pdf
16. https://www.sanfoundry.com/computer-network-questions-answers/
17. https://netseccloud.com/troubleshooting-common-issues-with-console-ports
18. https://www.geeksforgeeks.org/quizzes/50-computer-networks-mcqs-with-answers/
19. https://wayground.com/admin/quiz/67ab44f9d9a747f50f8a8abf/network-interface-card-quiz
20. https://www.sanfoundry.com/operating-system-mcqs-application-io-interface-1/