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CS 6262- Network Security Questions with 100% Correct Verified Answers
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CS 6262- Network Security Questions with 100% Correct Verified Answers
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CS 6262- Network Security Questionswith 100% Correct Verified Answers
Types of amplification attacks. - ANSWER DoS bug and DOS flood. Denial of service
bug and denial of service flood
DoS bug - ANSWER DoS attack designed to exploit a bug say a design flaw or
vulnerability, an implementation error on the server. The attacker machine can send
a few packets that contain input that would trigger the bug and then crash the server
rendering it unavailable
NTP (Network Time Protocol) - ANSWER An UDP based Internet protocol that enables
synchronization of computer clock times in a network of computers by exchanging time
signals. (UDP 123)
Why is NTP vulnerable to amplification attacks? - ANSWER
Internet Protocol (IP) - ANSWER The network protocol that deals with the routing of
packets through interconnected networks to the final destination. A communication
standard that enables computers to route communications traffic from one network to
another as needed. It is connectionless, unreliable and best effort based. Each packet
, will find it's way to destination and there is no mechanism to ensure that all packets
will arrive properly and in sequence
IP Header - ANSWER The header defined by the IP. Used to create IP packets by
encapsulating data supplied by higher-layer protocol (such as TCP) behind an IP
header. Most have a length of 20 bytes, but can be longer if options are applied.
From the security point of
view the main weakness of IP is that there is no authentication
of the source IP address. Which means that the attacker can
spoof an IP source address.
TCP (Transmission Control Protocol) - ANSWER Key characteristics are: Session
based, Congestion control and in-order delivery. TCP is tightly linked with IP and
usually seen as TCP/IP in writing. A connection-oriented, guaranteed-delivery protocol
used to send data packets between computers over a network like the Internet.
provides reliable, ordered, and error-checked delivery of a stream of packets on the
internet. Works at both ends of most Internet communication to ensure a perfect copy of
a message is sent.
TCP Handshake - ANSWER syn + syn/ack + ack. Suppose our client wants to connect to
a server. It first sends a SYN packet, this packet has a SYN flag set and also a sequence
number. The acknowledgement number is 0 because this is the first packet. The server
responds with a SYN/ACK packet, which means that both the SYN flap and
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