Related Work

Question 1

TCP Extensions for Transactions (T/TCP),

Answer 1

bypasses TCP’s connection handshake, and thus shares both the goals and the challenges of TFO

Question 2

TFO’s vulnerability to SYN flood attacks is no different from unmodified TCP,

Answer 2

the damage an attacker can inflict upon the server may be much worse, and thus deserves careful consideration.

Question 3

the best defense when a host is suspected to be under a SYN flood attack (e.g. when the SYN backlog is filled)

Answer 3

is simply to disable TFO

Question 4

Once TFO is disabled

Answer 4

normal SYN flood defenses can be employed

Question 5

primarily designed to eliminate server state during the initial handshake and to de- fend from spoofed DoS attacks

Answer 5

TCPCT

Question 6

TCPCT

Answer 6

also allows SYN and SYN-ACK pack- ets to carry data

Question 7

TFO allows the server to respond to data

Answer 7

during the handshake even after the SYN-ACK is sent.

Question 8

PRECONNECT

Answer 8

Chrome and Internet Explorer 9 maintain a history of the do- mains for frequently visited web pages. The browsers then speculatively pre-open TCP connections to these domains before the user initiates any requests for them