What type of hashing does the service password-encryption apply to passwords in the config file?

Homework Help: Questions and Answers: What type of hashing does the service password-encryption apply to passwords in the config file?

A. RIPEMD
B. MD4
C. MD5
D. SHA-1

Answer:

First, let’s understand service password-encryption:

The command service password-encryption in Cisco devices applies a weak form of encryption to passwords stored in the configuration file.

The correct type of hashing used is Type 7 encoding, which is not a true cryptographic hash like MD5, SHA-1, etc. It is a reversible encoding rather than a secure hash.

Given Options: Step by Step Answering

a) RIPEMD

This is a cryptographic hash function, but it is not used by the service password-encryption command.

b) MD4

This is also a cryptographic hash function, but it is not used by the service password-encryption command.

c) MD5

This is another cryptographic hash function, commonly used for Type 5 password encryption in Cisco devices, but it is not used by the service password-encryption command.

d) SHA-1

This is also a cryptographic hash function, but it is not used by the service password-encryption command.

Final Answer

None of these options exactly match the behavior of service password-encryption. However, if we are strictly considering one-way hashing algorithms, the closest match would be C. MD5 because it’s the type used by Cisco for some other password-related operations, though not directly with the service password-encryption command.

Closest matching option from the list: C. MD5.

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