MCQs

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1. What is a MAC address table primarily used for in a network switch?
   a. Mapping MAC addresses to IP addresses
   b. Mapping MAC addresses to switch ports
   c. Mapping IP addresses to hostnames
   d. Mapping VLANs to subnets
   Answer: bjumpcloud+1
2. What is another common term for the MAC address table in switches?
   a. Routing Table
   b. ARP Table
   c. CAM Table
   d. NAT Table
   Answer: cgeeksforgeeks+1
3. Which OSI layer operates MAC address tables?
   a. Layer 1 (Physical)
   b. Layer 2 (Data Link)
   c. Layer 3 (Network)
   d. Layer 4 (Transport)
   Answer: bjumpcloud+1
4. What is the main benefit of a MAC address table in Ethernet networks?
   a. Enables encrypted communication
   b. Reduces unnecessary network traffic
   c. Broadcasts every frame to all ports
   d. Converts frames to packets
   Answer: bjumpcloud
5. What does a switch do if a MAC address is not present in its address table?
   a. Drops the frame
   b. Forwards the frame to all ports (flooding)
   c. Forwards only to one random port
   d. Stores the frame without action
   Answer: bgeeksforgeeks+1
6. Which characteristic allows a MAC address table to dynamically learn device locations?
   a. Static mapping
   b. Broadcast storm control
   c. Listening to source MAC addresses of incoming frames
   d. Multicast filtering
   Answer: cgeeksforgeeks+1
7. What purpose does the “aging timer” serve in a MAC address table?
   a. Encrypts old entries
   b. Archives them in the cloud
   c. Removes inactive entries after a time period
   d. Increases their priority
   Answer: cjumpcloud
8. Which command would display the MAC address table on a Cisco switch?
   a. show running-config
   b. show mac address-table
   c. show ip route
   d. show vlan
   Answer: bjumpcloud
9. Which field is NOT typically present in a MAC address table?
   a. MAC Address
   b. Port Number
   c. VLAN ID
   d. Subnet Mask
   Answer: dgeeksforgeeks+1
10. What type of entry is manually added to a MAC address table?
    a. Static
    b. Dynamic
    c. Ephemeral
    d. Default
    Answer: ageeksforgeeks+1
11. What is the typical length of a MAC address?
    a. 24 bits
    b. 32 bits
    c. 48 bits
    d. 64 bits
    Answer: cgeeksforgeeks
12. What happens when the MAC address table overflows?
    a. Switch disables affected ports
    b. Switch converts all entries to static
    c. Switch floods frames for unknown addresses
    d. Switch ignores new entries
    Answer: cjumpcloud
13. Which of these is a vulnerability associated with MAC address tables?
    a. MAC flooding
    b. VLAN hopping
    c. Ping of death
    d. Replay attack
    Answer: ajumpcloud
14. What are the two main types of MAC address table entries?
    a. Primary and secondary
    b. Sequential and random
    c. Static and dynamic
    d. Persistent and volatile
    Answer: cgeeksforgeeks+1
15. What is the function of VLAN tags in a MAC address table?
    a. Identify subnet boundaries
    b. Separate broadcast domains on shared infrastructure
    c. Assign IP addresses automatically
    d. Encrypt MAC addresses
    Answer: bjumpcloud
16. What does a switch do upon receiving a frame from a new source MAC address?
    a. Forwards frame to all ports
    b. Ignores the frame
    c. Adds source MAC to its table with ingress port
    d. Requests authorization
    Answer: cgeeksforgeeks+1
17. Which protocol relies on the MAC address table for forwarding decisions?
    a. OSPF
    b. RIP
    c. Ethernet switching
    d. BGP
    Answer: cjumpcloud
18. MAC address tables support which type of traffic optimization?
    a. Multicast group pruning
    b. Efficient unicast frame forwarding
    c. Protocol encapsulation
    d. Packet fragmentation
    Answer: bjumpcloud
19. Which of these situations would cause a dynamic entry in the MAC address table to age out?
    a. Duplicate MAC address detected
    b. No frames received from the address within the aging period
    c. VLAN mismatch
    d. Interface shutdown
    Answer: bjumpcloud
20. Which command is used to view the MAC address table on a Linux device?
    a. ip addr show
    b. show running-config
    c. ifconfig -a
    d. arp -a
    Answer: dgeeksforgeeks
21. What is the effect of a static entry overriding a dynamic one for the same MAC address?
    a. Dynamic entry is ignored
    b. Both entries are used
    c. Frames are broadcast for that address
    d. The port becomes disabled
    Answer: ageeksforgeeks+1
22. What is the hexadecimal notation format of a MAC address?
    a. Only digits 0-9
    b. Letters and numbers separated by colons, hyphens, or periods
    c. Uppercase letters only
    d. Decimal separated by slashes
    Answer: bgeeksforgeeks
23. What does the MAC address table of a switch provide to network administrators?
    a. Virtual IP mapping
    b. Device-to-port mapping
    c. Storage for application data
    d. Firewall configuration
    Answer: bjumpcloud+1
24. What is Content Addressable Memory (CAM) in this context?
    a. Another term for MAC address table
    b. A storage type for user files
    c. A type of memory on servers
    d. A video streaming buffer
    Answer: ageeksforgeeks+1
25. Which of these best describes MAC table flooding?
    a. Sending ICMP packets to all MACs
    b. Overwriting the table with legitimate entries
    c. Filling the table with fake MAC addresses
    d. Encrypting broadcast traffic
    Answer: cjumpcloud
26. Dynamic entries in the MAC address table:
    a. Must be manually added
    b. Are learned by the switch automatically
    c. Are permanent unless deleted
    d. Require VLAN assignment
    Answer: bgeeksforgeeks+1
27. What is the result when two devices have the same MAC address on a network?
    a. Improved redundancy
    b. Network will not function correctly
    c. Faster network speeds
    d. Automatic load-balancing
    Answer: bgeeksforgeeks
28. In which scenarios would manual or static MAC address entries be necessary?
    a. For dynamic IP assignment
    b. For securing critical devices
    c. For backup switching paths
    d. For multicast routing
    Answer: bjumpcloud+1
29. Which technology commonly makes use of MAC address tables for efficient data delivery?
    a. Ethernet LANs
    b. VPN tunnels
    c. MPLS networks
    d. Public cloud internet
    Answer: ajumpcloud+1
30. What does table “aging” prevent in switch operation?
    a. MAC spoofing
    b. Table overflow with unused entries
    c. VLAN assignment errors
    d. Physical port shutdown
    Answer: bjumpcloud
31. Which OS command shows the MAC address assigned to a device in Windows?
    a. netstat
    b. ipconfig /all
    c. net view
    d. hostname
    Answer: bgeeksforgeeks
32. Which situation triggers a switch to update its MAC address table?
    a. Receiving a frame with a new source MAC address
    b. A port is administratively down
    c. STP calculation event
    d. An IP conflict is detected
    Answer: ageeksforgeeks+1
33. What do MAC address table entries map besides MAC addresses to ports?
    a. Hostnames
    b. VLAN IDs (if applicable)
    c. Subnet masks
    d. Bandwidth allocation
    Answer: bjumpcloud
34. For which type of frames will the switch consult its MAC address table for port lookup?
    a. IP packets
    b. Ethernet frames
    c. DNS requests
    d. Routing updates
    Answer: bgeeksforgeeks+1
35. “Flooding” occurs when:
    a. The MAC address is not in the table
    b. The frame is destined to an unused VLAN
    c. Table reaches maximum allowed size
    d. Duplicate MACs are present on the network
    Answer: ajumpcloud+1
36. Which of the following is NOT an effect of MAC table overflow?
    a. Increased frame flooding
    b. Enhanced network performance
    c. Possible security risks
    d. Unintended data disclosure
    Answer: bjumpcloud
37. What is required for a switch to create a dynamic MAC address entry?
    a. Manual configuration
    b. Receiving a frame from the MAC address on a specific port
    c. Receiving ARP requests only
    d. Network restart
    Answer: bgeeksforgeeks+1
38. When does a switch send a frame to all its ports (except incoming port)?
    a. When source address matches table entry
    b. When destination MAC is not in its table
    c. When VLAN ID is mismatch
    d. When table is full
    Answer: bjumpcloud
39. Which field in a MAC address uniquely identifies the manufacturer?
    a. First 24 bits of the MAC
    b. Last 24 bits of the MAC
    c. VLAN field
    d. IP address
    Answer: ageeksforgeeks
40. Why must MAC addresses be unique on a network?
    a. Prevents routing loops
    b. Prevents data delivery errors and collisions
    c. Required for faster internet access
    d. Encrypts communication
    Answer: bgeeksforgeeks
41. Commands like show mac address-table help network admins:
    a. Identify device to port mappings
    b. Assign IP addresses
    c. Configure firewalls
    d. Enable SSH
    Answer: ajumpcloud+1
42. Which problem can arise if the MAC address table is not correctly maintained?
    a. Network congestion
    b. IP spoofing
    c. DNS cache poisoning
    d. DHCP starvation
    Answer: ajumpcloud
43. What does the switch primarily do with the MAC address table during frame forwarding?
    a. Looks up destination MAC to determine the output port
    b. Encrypts the frame
    c. Assigns UDP port numbers
    d. Converts unicast to broadcast
    Answer: ajumpcloud
44. Which entry in the MAC address table has the highest priority?
    a. Dynamic
    b. Static
    c. Aged-out
    d. Ephemeral
    Answer: bgeeksforgeeks+1
45. Which technology uses MAC address tables to isolate different logical networks on the same physical switch?
    a. Routing
    b. VLANs
    c. VPNs
    d. Multicasting
    Answer: bjumpcloud
46. What occurs when a device moves to a different port on the switch?
    a. MAC address is deleted from the table
    b. MAC address entry updates to new port
    c. The switch blocks the device
    d. Current table entry becomes static
    Answer: bjumpcloud
47. The structure of a MAC address table always includes at least which two items?
    a. MAC address and port number
    b. MAC address and subnet
    c. VLAN ID and hostname
    d. Port number and interface description
    Answer: ageeksforgeeks+1
48. Why might an administrator manually assign a static MAC entry?
    a. To isolate a device from the network
    b. To ensure critical traffic always uses a specific port
    c. To enforce DHCP allocation
    d. To bypass VLAN segmentation
    Answer: bjumpcloud
49. Which scenario will NOT trigger a MAC address table update?
    a. New device connects and sends data
    b. Device sends no frames for a long period
    c. Port is administratively shut down
    d. IP address change of device
    Answer: djumpcloud
50. What is the typical action after a static MAC entry is removed by an admin?
    a. The corresponding port stops functioning
    b. The switch can relearn the address dynamically as traffic resumes
    c. Address becomes inaccessible forever
    d. Table requires clearing
    Answer: bgeeksforgeeks+1

1. https://jumpcloud.com/it-index/what-is-a-mac-address-table
2. https://www.geeksforgeeks.org/computer-networks/what-is-mac-address-table/
3. https://www.sanfoundry.com/computer-networks-questions-answers-mac-address/
4. https://www.watelectronics.com/mcq/address-resolution-protocol/
5. https://www.placementpreparation.io/mcq/computer-network/
6. https://networkwalks.com/0-4-bg-prep-session-ip-and-mac-address-quiz/
7. https://www.gdcramban.in/MCQ/networkmcq.pdf
8. https://www.getkisi.com/blog/media-access-control
9. https://arubanetworking.hpe.com/techdocs/AOS-CX/10.07/HTML/5200-7865/Content/Chp_mac/mac-add-tab.htm
10. https://reck.ac.in/wp-content/uploads/2023/04/DCN_MCQ-Ashwini-.pdf
11. https://www.sciencedirect.com/topics/computer-science/media-access-control
12. https://itexamanswers.net/7-2-3-address-resolution-quiz-answers.html
13. https://www.cisco.com/c/en/us/td/docs/switches/lan/csbms/350xseries/2_5_7/Administration/tesla-350-550/mac-address-tables.pdf
14. https://www.ccbp.in/blog/articles/computer-network-mcq
15. https://www.ipxo.com/blog/media-access-control/
16. https://notes.networklessons.com/mac-address
17. https://www.watelectronics.com/mcq/network-devices/
18. https://www.geeksforgeeks.org/computer-networks/mac-address-in-computer-network/
19. https://wit-hdip-computer-science.github.io/semester-1-computer-networks/topic03/talk-4/talk-4.pdf
20. https://en.wikipedia.org/wiki/MAC_address