Question 1hardmultiple choice
Full question →hardmultiple choiceObjective-mapped
Which statement best describes why GRE is often mentioned together with VPN discussions but is not itself the same as encryption?
Answer choices
Why each option matters
Good practice is not just finding the correct option. The wrong answers often show the exact trap the exam wants you to fall into.
A
Best answer
GRE provides tunneling, but confidentiality requires an additional security mechanism.
This is correct because GRE by itself is not an encryption technology.
B
Distractor review
GRE is already the same thing as WPA3 encryption.
This is wrong because GRE and WPA3 are unrelated security/tunneling concepts.
C
Distractor review
GRE replaces the need for default routes.
This is wrong because tunneling does not remove routing requirements.
D
Distractor review
GRE is used only on switch access ports.
This is wrong because GRE is not an access-port feature.
Common exam trap
Common exam trap: answer the scenario, not the keyword
A common exam trap is assuming GRE provides encryption because it is frequently mentioned with VPNs. Candidates might confuse GRE’s tunneling function with encryption, mistakenly believing GRE alone secures data confidentiality. This misunderstanding leads to incorrect answers that attribute encryption capabilities to GRE. The trap arises because GRE encapsulates traffic but transmits it in clear text, requiring an additional protocol like IPsec to provide encryption. Recognizing this distinction prevents selecting answers that incorrectly equate GRE with encryption technologies.
Technical deep dive
How to think about this question
Generic Routing Encapsulation (GRE) is a tunneling protocol used to encapsulate a wide variety of network layer protocols inside virtual point-to-point links over an IP network. GRE creates a private path or tunnel between two endpoints, allowing packets to be sent across incompatible or intermediate networks transparently. However, GRE itself does not provide any encryption or confidentiality features; it simply encapsulates the original packet within a new GRE header and IP header for transport. In Cisco networking and CCNA contexts, GRE tunnels are often paired with VPN technologies because they enable the encapsulation of multicast, broadcast, or non-IP traffic that IPsec alone cannot handle efficiently. The decision to use GRE alongside IPsec is based on the need to combine GRE's tunneling flexibility with IPsec's encryption and authentication capabilities. This separation of tunneling and encryption means that GRE provides the transport structure, while IPsec or other security protocols provide the transport protection. A common exam trap is to confuse GRE with encryption technologies or to assume GRE alone secures data confidentiality. In practice, GRE tunnels transmit data in clear text unless combined with encryption mechanisms. Network engineers must understand that GRE is a transport encapsulation method, not a security protocol. This distinction is critical for designing secure VPNs and correctly answering CCNA questions about tunneling and encryption.
KKey Concepts to Remember
- GRE encapsulates packets to create a tunnel but does not provide encryption or confidentiality by itself.
- VPN solutions often combine GRE tunneling with IPsec encryption to secure data over public networks.
- GRE supports encapsulating multicast and non-IP traffic, which IPsec alone cannot handle efficiently.
- Encryption requires a separate security protocol; GRE only provides the transport mechanism for encapsulated packets.
- Cisco routers use GRE tunnels to enable point-to-point virtual links across IP networks without altering the original payload.
- GRE tunnels do not replace routing functions or default routes; routing decisions still govern packet forwarding.
- GRE is not limited to switch access ports; it operates at Layer 3 on routers and Layer 3-capable devices.
- Understanding the difference between tunneling (GRE) and encryption (IPsec) is essential for CCNA exam success.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
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More questions from this exam
Keep practising from the same exam bank, or move into a focused topic page if this question exposed a weak area.
Question 1
A router learns the same prefix from both OSPF and EIGRP. Which route is installed by default?
Question 2
A router shows this output: R1#show ip ospf neighbor Neighbor ID Pri State Dead Time Address Interface 10.1.1.2 1 FULL/DR 00:00:34 192.168.12.2 GigabitEthernet0/0 10.1.1.3 1 2WAY/DROTHER 00:00:39 192.168.12.3 GigabitEthernet0/0 Which statement is correct?
Question 3
What is the OSPF metric called?
Question 4
A non-root switch has two uplinks toward the root bridge. One path has a lower total STP cost than the other. What role will the lower-cost uplink have?
Question 5
A router interface applies this ACL inbound: 10 deny tcp any any eq 80 20 permit ip any any A user reports that web browsing to a server by IP address fails, but ping works. Which statement best explains the behavior?
Question 6
A router learns route 198.51.100.0/24 from OSPF with AD 110 and also has a static route to the same prefix configured with AD 150. Which route is installed?
FAQ
Questions learners often ask
What does this 200-301 question test?
GRE encapsulates packets to create a tunnel but does not provide encryption or confidentiality by itself.
What is the correct answer to this question?
The correct answer is: GRE provides tunneling, but confidentiality requires an additional security mechanism. — GRE is often mentioned in VPN discussions because it provides tunneling, but tunneling and encryption are not the same thing. In practical terms, GRE can encapsulate traffic across another network path, but by itself it does not provide confidentiality. Encryption must come from an additional security mechanism if confidentiality is required. This is a classic distinction between transport structure and transport protection.
What should I do if I get this 200-301 question wrong?
Then try more questions from the same exam bank and focus on understanding why the wrong options are tempting.
Discussion
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