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How do you protect your network against SYN Flood attacks?

The SYN flood attack sends TCP connections requests faster than a machine can process them.
Attacker creates a random source address for each packet
SYN flag set in each packet is a request to open a new connection to the server from the
spoofed IP address
Victim responds to spoofed IP address,then waits for confirmation that never arrives (timeout
wait is about 3 minutes)
Victim’s connection table fills up waiting for replies and ignores new connections
Legitimate users are ignored and will not be able to access the server
How do you protect your network against SYN Flood attacks?

What should Stephanie use so that she does not get in trouble for surfing the Internet?

Stephanie works as a records clerk in a large office building in downtown Chicago. On Monday,
she went to a mandatory security awareness class (Security5) put on by her company’s IT
department. During the class, the IT department informed all employees that everyone’s Internet
activity was thenceforth going to be monitored.
Stephanie is worried that her Internet activity might give her supervisor reason to write her up, or

worse get her fired. Stephanie’s daily work duties only consume about four hours of her time, so
she usually spends the rest of the day surfing the web. Stephanie really enjoys surfing the Internet
but definitely does not want to get fired for it.
What should Stephanie use so that she does not get in trouble for surfing the Internet?

What is Jason trying to accomplish here?

In TCP communications there are 8 flags; FIN, SYN, RST, PSH, ACK, URG, ECE, CWR. These
flags have decimal numbers assigned to them:
FIN = 1
SYN = 2
RST = 4
PSH = 8

ACK = 16
URG = 32
ECE = 64
CWR = 128
Jason is the security administrator of ASPEN Communications. He analyzes some traffic using
Wireshark and has enabled the following filters.

What is Jason trying to accomplish here?


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