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1. What is tunneling in networking?
   a. Transmitting one protocol packet inside another protocol packet
   b. Routing a packet without modification
   c. Encrypting data at the application layer
   d. Filtering packets based on IP address
   Answer: a
   Source: PubNubpubnub
2. What is the primary purpose of tunneling?
   a. To enable secure communication between different networks
   b. To increase packet size
   c. To reduce network latency
   d. To translate DNS queries
   Answer: a
   Source: GeeksforGeeksgeeksforgeeks
3. Which of the following is NOT a tunneling protocol?
   a. IPsec
   b. GRE
   c. FTP
   d. L2TP
   Answer: c
   Source: GeeksforGeeksgeeksforgeeks
4. How does tunneling encapsulate packets?
   a. Original packet is wrapped inside a new protocol packet
   b. Original packet is discarded and replaced
   c. Packet is compressed without modification
   d. Packet header is encrypted directly
   Answer: a
   Source: PubNubpubnub
5. Which tunneling protocol is often used for VPNs?
   a. PPTP
   b. DNS
   c. HTTP
   d. SMTP
   Answer: a
   Source: PubNubpubnub
6. What is the main disadvantage of tunneling?
   a. Increased overhead due to encapsulation
   b. Inability to traverse firewalls
   c. Reduced packet security
   d. Decreased network compatibility
   Answer: a
   Source: PubNubpubnub
7. What role does encapsulation play in tunneling?
   a. It adds an external header to the original packet
   b. It compresses the original packet
   c. It removes redundant data from the packet
   d. It filters unwanted traffic
   Answer: a
   Source: GeeksforGeeksgeeksforgeeks
8. Which tunneling protocol helps in transitioning IPv4 to IPv6?
   a. 6to4
   b. DNS
   c. FTP
   d. RIP
   Answer: a
   Source: PubNubpubnub
9. GRE in networking stands for:
   a. Generic Routing Encapsulation
   b. General Routing Extension
   c. Gateway Routing Endpoint
   d. Global Resource Exchange
   Answer: a
   Source: GeeksforGeeksgeeksforgeeks
10. What is an overlay network in terms of tunneling?
    a. A virtual network created by tunnels
    b. The physical network infrastructure
    c. A wireless access point
    d. A multicast routing protocol
    Answer: a
    Source: Scribd Networktut MCQscribd
11. What is the underlay network in tunneling terminology?
    a. The physical network carrying tunneled packets
    b. The encrypted tunnel inside the packet
    c. The virtual private network endpoint
    d. The firewall filtering traffic
    Answer: a
    Source: Scribd Networktut MCQscribd
12. Which tunneling protocol provides encryption and secure key exchange?
    a. IPsec
    b. SMTP
    c. FTP
    d. GRE
    Answer: a
    Source: GeeksforGeeksgeeksforgeeks
13. What happens to tunneled packets when they reach the destination?
    a. They are decapsulated to extract the original packet
    b. They are encrypted again
    c. They are discarded and retransmitted
    d. They are routed directly to the router
    Answer: a
    Source: PubNubpubnub
14. Point-to-Point Tunneling Protocol (PPTP) primarily runs over which protocol?
    a. TCP
    b. UDP
    c. ICMP
    d. HTTP
    Answer: a
    Source: PubNubpubnub
15. Which tunneling protocol is associated with Layer 2 of OSI Model?
    a. L2TP
    b. GRE
    c. IPsec
    d. HTTP
    Answer: a
    Source: GeeksforGeeksgeeksforgeeks
16. What is Path MTU Discovery in tunneling?
    a. Mechanism to avoid packet fragmentation in tunnels
    b. Protocol for establishing tunnels
    c. Encryption standard for VPNs
    d. Routing algorithm for tunnels
    Answer: a
    Source: Sanfoundryscribd
17. Which of these tunneling protocols can carry multiple protocols within tunnels?
    a. GRE
    b. FTP
    c. SMTP
    d. DHCP
    Answer: a
    Source: GeeksforGeeksgeeksforgeeks
18. Which is the major benefit of using tunneling in IPv6 migration?
    a. Allows IPv6 packets to be sent over IPv4 networks
    b. Encrypts DNS queries
    c. Filters invalid IPv6 addresses
    d. Compresses IPv6 headers
    Answer: a
    Source: PubNubpubnub
19. In IPsec tunneling mode, what is protected?
    a. The entire IP packet
    b. Only the header
    c. Only the payload
    d. None
    Answer: a
    Source: Sanfoundry Network Securitycwipedia
20. What does the term “tunnel endpoint” refer to?
    a. Devices where packets enter and exit a tunnel
    b. A firewall on the path
    c. Router interface with NAT
    d. The encrypted key
    Answer: a
    Source: PubNubpubnub
21. What is the primary use of Secure Socket Tunneling Protocol (SSTP)?
    a. Secure transmission over HTTPS
    b. Routing internal emails
    c. DNS query forwarding
    d. Streaming multimedia
    Answer: a
    Source: GeeksforGeeksgeeksforgeeks
22. Which tunneling method encapsulates IPv6 packets inside IPv4 headers?
    a. 6in4
    b. PPP
    c. SNMP
    d. ARP
    Answer: a
    Source: PubNubpubnub
23. What distinguishes GRE from IPsec tunneling?
    a. GRE does not provide encryption, IPsec does
    b. GRE is always encrypted, IPsec is not
    c. GRE works on Layer 3 only
    d. IPsec cannot tunnel packets
    Answer: a
    Source: GeeksforGeeksgeeksforgeeks
24. What is the overhead drawback of tunneling?
    a. Increased packet size due to encapsulation
    b. Reduced bandwidth usage
    c. Immediate packet delivery
    d. Lower latency
    Answer: a
    Source: PubNubpubnub
25. Which tunneling protocol is considered deprecated due to known security issues?
    a. PPTP
    b. IPsec
    c. L2TP
    d. GRE
    Answer: a
    Source: Sanfoundrysanfoundry
26. Which of the following encapsulates PPP frames to be sent over IP networks?
    a. L2TP
    b. GRE
    c. IPsec
    d. SMTP
    Answer: a
    Source: GeeksforGeeksgeeksforgeeks
27. What is the purpose of IP-in-IP tunneling?
    a. Encapsulate one IP packet inside another for routing purposes
    b. Encrypt IP packets
    c. Compress IPv4 headers
    d. Filter IP packets on a router
    Answer: a
    Source: PubNubpubnub
28. Which tunneling protocol is often used to secure VPNs on Windows platforms?
    a. SSTP
    b. GRE
    c. FTP
    d. L2TP
    Answer: a
    Source: GeeksforGeeksgeeksforgeeks
29. What does the term “tunnel broker” mean?
    a. A service that provides IPv6 connectivity via tunnels
    b. A router manufacturer
    c. Firewall software
    d. Traffic analyzer
    Answer: a
    Source: PubNubpubnub
30. What type of network communication can tunneling enable?
    a. Connecting incompatible network protocols
    b. Increasing broadcast traffic
    c. Blocking incoming connections
    d. Multiplexing physical cables
    Answer: a
    Source: GeeksforGeeksgeeksforgeeks
31. Which layer of the OSI model does GRE operate on?
    a. Layer 3 (Network Layer)
    b. Layer 2 (Data Link Layer)
    c. Layer 4 (Transport Layer)
    d. Layer 1 (Physical Layer)
    Answer: a
    Source: GeeksforGeeksgeeksforgeeks
32. What advantage does IPsec tunneling provide over GRE?
    a. Authentication, integrity, and encryption
    b. Reduced header size
    c. Simpler configuration
    d. Faster packet forwarding
    Answer: a
    Source: PubNubpubnub
33. What is the function of a “tunnel interface”?
    a. A logical interface representing the tunnel endpoint
    b. Physical cable connection
    c. Wireless access point
    d. DHCP server
    Answer: a
    Source: Scribd Networktut MCQscribd
34. What is a key characteristic of Layer 2 Tunneling Protocol (L2TP)?
    a. It does not provide encryption by itself
    b. It provides built-in encryption
    c. It tunnels only TCP packets
    d. It functions as a firewall
    Answer: a
    Source: GeeksforGeeksgeeksforgeeks
35. What kind of tunneling encapsulates Ethernet frames?
    a. VPN tunneling protocols like L2TP
    b. GRE tunnels only
    c. IPsec tunnels only
    d. HTTP tunneling
    Answer: a
    Source: PubNubpubnub
36. Which tunneling protocol was developed by Cisco and Microsoft?
    a. PPTP
    b. GRE
    c. IPsec
    d. SSTP
    Answer: a
    Source: PubNubpubnub
37. What is one security risk associated with tunneling?
    a. Unauthorized tunnel creation bypassing security controls
    b. Faster routing
    c. Packet loss due to fragmentation
    d. Excessive bandwidth usage
    Answer: a
    Source: Sanfoundrysanfoundry
38. How are tunnels identified at endpoints?
    a. By IP addresses and tunnel interface configuration
    b. By MAC addresses only
    c. By protocol type only
    d. By DNS names
    Answer: a
    Source: PubNubpubnub
39. What mechanism helps prevent fragmentation issues in tunneling?
    a. Path MTU Discovery (PMTUD)
    b. Static routing
    c. VLAN tagging
    d. DNS caching
    Answer: a
    Source: Sanfoundryscribd
40. Which protocol is often combined with GRE to secure data?
    a. IPsec
    b. FTP
    c. SMTP
    d. HTTP
    Answer: a
    Source: PubNubpubnub
41. What is “double encapsulation” in tunneling?
    a. Encapsulating a packet twice for nested tunnels
    b. Encrypting twice the same packet
    c. Compressing twice the payload
    d. Routing packets twice
    Answer: a
    Source: GeeksforGeeksgeeksforgeeks
42. Which one is NOT a benefit of tunneling?
    a. High latency reduction
    b. Protocol compatibility
    c. Secure data transmission
    d. Network scalability
    Answer: a
    Source: PubNubpubnub
43. What type of tunneling is called “automatic tunneling”?
    a. Tunneling performed without manual configuration, e.g., Teredo
    b. Manual IPsec configuration
    c. GRE with encryption
    d. VPN with certificates
    Answer: a
    Source: Sanfoundryreck
44. How does an IPsec tunnel protect traffic?
    a. By encrypting and authenticating IP packets
    b. By removing headers
    c. By compressing packet data
    d. By adding VLAN tags
    Answer: a
    Source: Sanfoundry Network Securitycwipedia
45. What does a “tunnel key” refer to?
    a. Identifier used to distinguish tunnels between the same endpoints
    b. Encryption key for all tunnels globally
    c. Password for user authentication
    d. IP address of tunnel endpoint
    Answer: a
    Source: GeeksforGeeksgeeksforgeeks
46. Which tunneling protocol encapsulates IPv4 packets inside IPv4 packets?
    a. IP-in-IP
    b. GRE
    c. PPTP
    d. L2TP
    Answer: a
    Source: PubNubpubnub
47. What is the purpose of “split tunneling” in VPNs?
    a. To route some traffic through the VPN while other traffic goes direct
    b. To encrypt all internet traffic only
    c. To block local resources
    d. To create multiple tunnels simultaneously
    Answer: a
    Source: Sanfoundrysanfoundry
48. Which tunneling protocol is layered over UDP for NAT traversal?
    a. L2TP
    b. GRE
    c. IP-in-IP
    d. SSH
    Answer: a
    Source: GeeksforGeeksgeeksforgeeks
49. What is the meaning of “decapsulation” in tunneling?
    a. Removing outer headers to retrieve the original packet
    b. Encrypting the packet twice
    c. Adding routing information
    d. Dropping tunneled packets
    Answer: a
    Source: PubNubpubnub
50. Which protocol supports secure key exchange in IPsec tunneling?
    a. Internet Key Exchange (IKE)
    b. DNS
    c. DHCP
    d. SMTP
    Answer: a
    Source: GeeksforGeeksgeeksforgeeks

1. https://www.pubnub.com/learn/glossary/tunneling-in-networking/
2. https://www.geeksforgeeks.org/computer-networks/tunneling/
3. https://www.scribd.com/document/441799143/NETWORKTUT-MCQ-docx
4. https://www.scribd.com/document/455187372/MCQ-question-Latest
5. https://server.cwipedia.in/DATA/SEM-VI/NIS/NIS%20MCQ%20%20QB%20cwipedia.pdf
6. https://www.sanfoundry.com/cyber-security-questions-answers-vpns/
7. https://www.sanfoundry.com/computer-networks-questions-answers-security/
8. https://reck.ac.in/wp-content/uploads/2023/04/DCN_MCQ-Ashwini-.pdf
9. https://mcqslearn.com/cs/computer-networks/tunneling.php
10. https://www.sanfoundry.com/surveying-questions-answers-tunnelling/
11. https://www.gdcramban.in/MCQ/networkmcq.pdf
12. https://www.sanfoundry.com/computer-networks-questions-answers-quiz/
13. https://www.sanfoundry.com/computer-network-questions-answers/
14. https://www.scribd.com/document/581910536/TOP-NETWORKING-Multiple-Choice-Questions-and-Answers
15. https://testbook.com/objective-questions/mcq-on-tunneling–63f34e205a42af8d8d85d8c3
16. https://testbook.com/question-answer/which-of-the-following-internet-services-is-a-secu–6577225defa68978a7142102
17. https://examradar.com/computer-networking-network-security-mcqs/
18. https://www.examsbook.com/questions/which-of-the-following-is-an-example-of-a-tunneling-network
19. https://www.includehelp.com/networking/vpn-aptitude-questions-and-answers.aspx
20. https://www.studocu.com/in/document/dr-apj-abdul-kalam-technical-university/btech/computer-network-all-unit-multiple-choice-questions-and-answers/15939837