Which of the following services has a data encryption mechanism?

The correct answer is D. GRE. GRE (Generic Routing Encapsulation) supports encryption when combined with IPsec, making it the only option here capable of securing data in transit - this pairing (GRE over IPsec) is standard in VPN deployments. Telnet transmits all data, including credentials, in plain text…

Network Security

Question

Which of the following services has a data encryption mechanism?

Options

ATelnet
BHTTP
CSNMPv1
DGRE

How the community answered

(52 responses)

A
4% (2)
B
13% (7)
C
8% (4)
D
75% (39)

Explanation

GRE (Generic Routing Encapsulation) supports encryption when combined with IPsec, making it the only option here capable of securing data in transit - this pairing (GRE over IPsec) is standard in VPN deployments. Telnet transmits all data, including credentials, in plain text with zero encryption, which is why SSH replaced it. HTTP likewise sends traffic unencrypted (HTTPS adds TLS, but plain HTTP does not). SNMPv1 is famously insecure - it uses community strings sent in cleartext, with no authentication or encryption; SNMPv3 was introduced specifically to address this.

Memory tip: Think "GRE gets encrypted" - the G stands for "guards" your data when paired with IPsec. The others (Telnet, HTTP, SNMPv1) are all legacy/v1 protocols notorious for being security weaknesses, which is a pattern worth remembering as a group.

Topics

#Protocol Security#Data Encapsulation#Encryption Mechanisms#Tunneling

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