11.3 - Denial of Service Attacks Flashcards by Sarin Patel | Brainscape

Q

What is Denial of Service?

A

Attempt to exhaust resources:

Network bandwidth
TCP connections
Server resources

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Q

3 different defenses against DoS

A

Ingress filtering
+ fool proof
+ works at edges
- doesn’t work in core
uRPF checks
+ automatic
- requires symmetric routing
SynCookies (TCP)

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Q

Advantages of SYN cookies

A

Prevent server from exhausting state after TCP SYN

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Q

Backscatter

A

IP address spoofing -> “backscatter”

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