CEH-001 Exam Dumps : Certified Ethical Hacker (CEH)

Snort has been used to capture packets on the network. On studying the packets, the penetration tester finds it to be abnormal. If you were the penetration tester, why would you find this abnormal?

05/20-17:0645.061034 192.160.13.4:31337 --> 172.16.1.101:1

TCP TTL:44 TOS:0x10 ID:242

***FRP** Seq:0xA1D95  Ack:0x53  Win: 0x400

What is odd about this attack? (Choose the most appropriate statement)

Which of the following is an example of IP spoofing?

After a client sends a connection request (SYN) packet to the server, the server will respond (SYN-ACK) with a sequence number of its choosing, which then must be acknowledged (ACK) by the client. This sequence number is predictable; the attack connects to a service first with its own IP address, records the sequence number chosen, and then opens a second connection from a forged IP address. The attack doesn't see the SYN-ACK (or any other packet) from the server, but can guess the correct responses. If the source IP address is used for authentication, then the attacker can use the one-sided communication to break into the server. What attacks can you successfully launch against a server using the above technique?