In this problem we investigate whether either UDP or TCP provides a degree of end-point authentication. a. Consider a server that receives a request within a UDP packet and responds to that request within a UDP packet (for example, as done by a DNS server). If a client with IP address X spoofs its address with address Y, where will the server send its response? b. Suppose a server receives a SYN with IP source address Y, and after responding with a SYNACK, receives an ACK with IP source address Y with the correct acknowledgment number. Assuming the server chooses a random initial sequence number and there is no "man-in-the-middle," can the server be certain that the client is indeed at Y (and not at some other address X that is spoofing Y)?

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
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In this problem we investigate whether either UDP or TCP provides a degree of
end-point authentication.
a. Consider a server that receives a request within a UDP packet and responds to
that request within a UDP packet (for example, as done by a DNS server). If a
client with IP address X spoofs its address with address Y, where will the server
send its response?
b. Suppose a server receives a SYN with IP source address Y, and after responding
with a SYNACK, receives an ACK with IP source address Y with the correct
acknowledgment number. Assuming the server chooses a random initial sequence
number and there is no "man-in-the-middle," can the server be certain that the
client is indeed at Y (and not at some other address X that is spoofing Y)?
Transcribed Image Text:In this problem we investigate whether either UDP or TCP provides a degree of end-point authentication. a. Consider a server that receives a request within a UDP packet and responds to that request within a UDP packet (for example, as done by a DNS server). If a client with IP address X spoofs its address with address Y, where will the server send its response? b. Suppose a server receives a SYN with IP source address Y, and after responding with a SYNACK, receives an ACK with IP source address Y with the correct acknowledgment number. Assuming the server chooses a random initial sequence number and there is no "man-in-the-middle," can the server be certain that the client is indeed at Y (and not at some other address X that is spoofing Y)?
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