Exam 200-301 topic 1 question 995 discussion

Anti-replay is a security method that is used to prevent man-in-the-middle attacks by ensuring that network packets are received and processed only once. This is typically accomplished by adding a unique identifier, called a sequence number or nonce, to each packet. The recipient of the packet keeps track of the sequence numbers that it has received and processes only packets that have not been received before. If a packet with a duplicate sequence number is received, it is discarded.

Option B: Anti-replay is a security method used to prevent an attacker from intercepting and replaying valid data, but it is not specifically used to prevent man-in-the-middle (MITM) attacks. Anti-replay works by using sequence numbers or timestamps to ensure that each piece of data is unique and has not been intercepted and replayed by an attacker. While this can help prevent certain types of attacks, it is not a complete solution for preventing MITM attacks. Authentication, on the other hand, is specifically designed to prevent MITM attacks by verifying the identity of each party in a communication.

Authentication

The authentication method is used because it verifies the identities of participants in a network or communication. In the case of a man-in-the-middle attack, an attacker attempts to interfere with communication between two parties by pretending to be one of them. Authentication ensures that each party is indeed who they claim to be, thus preventing the success of a man-in-the-middle attack.

I think it's B. MITM attacks can occur over the athuentication-process of WPA2 with KRACK. WPA3 should fix that.

it´s A anti-replay is a security mechanism used to prevent replay attacks, not man-in-the-middle attacks.

B is correct

From Wendell Odom, CCNA 200-301 Official Cert Guide Vol. 2: "Anti-replay: Preventing a man in the middle from copying and later replaying the packets sent by a legitimate user, for the purpose of appearing to be a legitimate user." It's the correct answer. None of the other options are strict protections against MITM.

Anti replay : Preventing a man in the middle from copying and later replaying the packets sent by a legitimate user, for the purpose of appearing to be a legitimate user. From OCG

Man-in-the-middle attack should be the person without authentication, they try to collect all the packet of network traffic by the software sniffer and reached the goal.

A. Authentication- MITM attacks can be prevented or detected by two means: authentication and tamper detection.

Authentication is the security method used to prevent man-in-the-middle attacks. Man-in-the-middle attacks occur when an attacker intercepts and alters communication between two parties, without their knowledge. By authenticating the identities of the communicating parties, it becomes more difficult for an attacker to impersonate one of them and insert themselves into the communication. Authentication methods can include passwords, digital certificates, biometric authentication, two-factor authentication (2FA), and other mechanisms that verify the identity of the communicating parties. By ensuring that the parties involved are who they claim to be, authentication helps protect against man-in-the-middle attacks and helps establish a secure and trusted communication channel.