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Question 169 - 200-201 discussion

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An engineer is addressing a connectivity issue between two servers where the remote server is unable to establish a successful session. Initial checks show that the remote server is not receiving an SYN-ACK while establishing a session by sending the first SYN. What is causing this issue?

A.

incorrect TCP handshake

Answers
A.

incorrect TCP handshake

B.

incorrect UDP handshake

Answers
B.

incorrect UDP handshake

C.

incorrect OSI configuration

Answers
C.

incorrect OSI configuration

D.

incorrect snaplen configuration

Answers
D.

incorrect snaplen configuration

Suggested answer: A

Explanation:

A TCP handshake is a three-way exchange of messages between a client and a server to establish a TCP connection. The client initiates the handshake by sending a SYN packet with a sequence number to the server. The server responds with a SYN-ACK packet with its own sequence number and an acknowledgment number that is the client's sequence number plus one. The client completes the handshake by sending an ACK packet with an acknowledgment number that is the server's sequence number plus one. If the remote server is not receiving an SYN-ACK packet from the local server, it means that the TCP handshake is not completed and the connection is not established. This could be caused by various factors, such as network congestion, firewall rules, packet filtering, or misconfiguration of the TCP parameters on either end.Reference:=Understanding Cisco Cybersecurity Operations Fundamentals (CBROPS) - Cisco, page 177;TCP 3-Way Handshake Process - GeeksforGeeks

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asked 07/10/2024
franck ferreira
27 questions
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