SSH Implementations and Usage

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Questions and Answers

What primary encryption technique does SSH use to ensure secure communication?

Symmetric cryptography only
Hashing algorithms
Steganography
Public-key cryptography (correct)

Which of the following is NOT a function of SSH?

Secure tunnelling
Bandwidth throttling (correct)
Secure file transfer
Remote system management

Which SSH feature allows for automation of repetitive administrative tasks?

SSH scripting (correct)
Password authentication
Secure tunnelling
Public-key exchange

What main advantage does SSH provide over Telnet?

Powerful command-line interface and security features (B) Signup and view all the answers

Which software is primarily used for SSH on Windows systems?

PuTTY (A) Signup and view all the answers

What is the purpose of using secure tunnels in SSH?

To allow insecure protocols to run securely (D) Signup and view all the answers

Which authentication method offers an extra layer of security in SSH?

Public-key cryptography (C) Signup and view all the answers

How can SSH be configured on Windows?

Via the Windows Settings app (A) Signup and view all the answers

Which protocol provides secure data transfer through strong encryption?

SSH (B) Signup and view all the answers

What is the default port used by SSH?

22 (D) Signup and view all the answers

Which of the following is a stronger authentication method utilized by SSH?

Keys (D) Signup and view all the answers

Which feature is NOT supported by SSH?

Multi-factor authentication (A) Signup and view all the answers

What type of transfer is associated with Telnet?

Unencrypted (A) Signup and view all the answers

Which of the following reflects the flexibility of SSH compared to Telnet?

More command-line functionality (B) Signup and view all the answers

Which statement is true about data transfer in Telnet?

It is transmitted in plaintext. (C) Signup and view all the answers

Which statement is correct regarding scripting capabilities?

SSH has limited scripting capabilities. (B) Signup and view all the answers

What is one of the encryption technologies used by SSH?

Symmetrical encryption (C) Signup and view all the answers

Which command allows a user to connect to a remote host using SSH?

ssh <a href="mailto:[email protected]">[email protected]</a> (B) Signup and view all the answers

What is the primary function of a firewall in a network?

To control access to and from the protected network (D) Signup and view all the answers

What is an example of how SSH can be used from the command line?

ssh <a href="mailto:[email protected]">[email protected]</a> ls (C) Signup and view all the answers

Which of the following best describes a firewall?

A network device separating protected and unprotected networks (C) Signup and view all the answers

What can happen if an internal network is connected directly to the Internet without a firewall?

Every system may become vulnerable (B) Signup and view all the answers

Which of the following is NOT a type of encryption used by SSH?

Block encryption (B) Signup and view all the answers

What precaution is essential for proper network security when using a firewall?

Securing every system on the internal network (D) Signup and view all the answers

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Study Notes

SSH Overview

OpenSSH is the most common open-source implementation of SSH found on Linux, Unix, and BSD-based operating systems, including macOS.
On Windows, OpenSSH is not enabled by default and must be activated via the Windows Settings app.
PuTTY is another popular open-source SSH client originally designed for Windows but now available for multiple platforms including macOS and Unix/BSD.

Reasons for Using SSH

Strong Authentication: Supports various methods including passwords and public-key cryptography for enhanced security.
Secure File Transfer: Provides encrypted file transfer capabilities, ensuring sensitive data remains secure from interception.
Secure Tunneling: Allows the creation of secure tunnels for running insecure protocols over unencrypted networks, such as FTP.
Automated Tasks: Scripting through SSH enables administrators to automate repetitive tasks efficiently.
Flexibility: Offers a powerful command-line interface for managing files, users, and services, surpassing the limitations of Telnet.

SSH vs Telnet

Security:
- Telnet is unsecured with no encryption.
- SSH employs strong encryption for secure communication.
Port:
- Telnet operates on port 23.
- SSH uses port 22 by default.
Authentication:
- Telnet relies on basic username/password authentication.
- SSH supports stronger authentication through keys as well.
Data Transfer:
- Telnet transfers data in plaintext.
- SSH uses encryption for secure data transfer.
Multi-factor Authentication: Not supported in Telnet, while SSH supports it.
File Transfer: Telnet's transfer is insecure; SSH ensures secure file transfers.
Scripting Capabilities: Telnet has limited scripting; SSH offers extensive scripting functionalities.
Flexibility: Telnet provides limited functionalities compared to SSH's powerful command-line interface.

SSH Encryption Methods

Symmetrical Encryption: Uses the same key for both encryption and decryption.
Asymmetrical Encryption: Utilizes a pair of keys (public and private) for secure communication.
Hashing: Provides data integrity by generating a fixed-size hash value from data.

Basic SSH Commands

Use the command format ssh username@hostname to connect to a remote server.
Upon connecting, a password prompt appears for the remote user account.
To run a single command on a remote host and exit, use ssh username@hostname 'command' (e.g., listing directory contents using ls).

Firewalls

A firewall is a critical network device or host with multiple network interfaces, controlling access between protected internal networks and external unprotected networks like the Internet.
It acts as a security barrier, preventing unauthorized access while safeguarding sensitive internal data and software.
Direct connection of internal networks to the Internet necessitates rigorous security, as a single error can compromise the entire network.

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