112-51 Exam Dumps : Network Defense Essentials (NDE) Exam

A transposition cipher is a type of cipher that encrypts a document by rearranging the same characters to produce the ciphertext. A transposition cipher does not change the identity or frequency of the characters, but only their position. A transposition cipher can use various methods to permute the characters, such as writing them in a grid and reading them in a different order, or shifting them along a rail fence pattern. A transposition cipher is a simple and fast algorithm, but it can be easily broken by frequency analysis or anagramming. A transposition cipher is the type of cipher employed by Kevin in the above scenario, as he used a simple algorithm to encrypt the document that just rearranges the same characters to produce the ciphertext.References:

• Transposition cipher- Wikipedia
• Network Security: Transposition Cipher Techniques- Coding Streets
• Network Defense Essentials (NDE) | Coursera- Module 4: Cryptography Techniques
• Columnar Transposition Cipher- GeeksforGeeks

The IDS component that analyzes the traffic and reports if any suspicious activity is detected is the network sensor. A network sensor is a device or software application that is deployed at a strategic point or points within the network to monitor and capture the network traffic to and from all devices on the network. A network sensor can operate in one of two modes: promiscuous or inline. In promiscuous mode, the network sensor passively listens to the network traffic and copies the packets for analysis. In inline mode, the network sensor actively intercepts and filters the network traffic and can block or modify the packets based on predefined rules. A network sensor analyzes the network traffic using various detection methods, such as signature-based, anomaly-based, or reputation-based, and compares the traffic patterns with a database of attack signatures or a model of normal behavior. If the network sensor detects any suspicious or malicious activity, such as a reconnaissance scan, an unauthorized access attempt, or a denial-of-service attack, it generates an alert and reports it to the IDS manager or the operator.A network sensor can also integrate with a response system to take appropriate actions, such as logging, notifying, or blocking, in response to the detected activity123.References:

• Network Defense Essentials Courseware, EC-Council, 2020, pp. 3-33 to 3-34
• Intrusion Detection System (IDS) - GeeksforGeeks, GeeksforGeeks, 2020
• Intrusion detection system - Wikipedia, Wikipedia, March 16, 2021

FTP traffic does not provide encryption in the data transfer process, and the data transfer between the sender and receiver is in plain text. FTP stands for File Transfer Protocol, and it is a standard network protocol for transferring files between a client and a server over a TCP/IP network. FTP uses two separate channels for communication: a control channel for sending commands and receiving responses, and a data channel for transferring files. However, FTP does not encrypt any of the data that is sent or received over these channels, which means that anyone who can intercept the network traffic can read or modify the contents of the files, as well as the usernames and passwords used for authentication. This poses a serious security risk for the confidentiality, integrity, and availability of the data and the systems involved in the file transfer. Therefore, FTP is not a secure way to transfer sensitive or confidential data over the network.References:

• Network Defense Essentials Courseware, EC-Council, 2020, pp. 3-31 to 3-32
• What is FTP, and Why Does It Matter in 2021?, Kinsta, January 4, 2021
• FTP Security, Wikipedia, February 9, 2021