The following figure shows a scenario of insertion attack in which packet "O" has a bad checksum. Why does NIDS let the packet pass through?     Question options:   NIDS cannot detect the packet "O"   NIDS is not allowed to check the checksum of each packet   NIDS does not check single letter packet   NIDS is not programmed to validate the checksum of each packet.    Question 13      What is the purpose of the following traffic?       Question options:   discover open UDP ports   discover open services   discover open ICMP ports   discover live hosts

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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Question 10  
 

 The following figure shows a scenario of insertion attack in which packet "O" has a bad checksum. Why does NIDS let the packet pass through?

 

 
Question options:
 

NIDS cannot detect the packet "O"

 

NIDS is not allowed to check the checksum of each packet

 

NIDS does not check single letter packet

 

NIDS is not programmed to validate the checksum of each packet. 

 
Question 13  
 

 What is the purpose of the following traffic?

 

 

 
Question options:
 

discover open UDP ports

 

discover open services

 

discover open ICMP ports

 

discover live hosts

 
NIDS
Destination
R
R
NIDS
Destination
Bad TCP
checksum
NIDS
Destination
EWT
EWT
NIDS sees ROEWT
Destination host sees REWT
Transcribed Image Text:NIDS Destination R R NIDS Destination Bad TCP checksum NIDS Destination EWT EWT NIDS sees ROEWT Destination host sees REWT
09:40:43.964215 verbo.47247 > sparky.1548: S 2401927088:2401927088 (0) win
2048
09:40:43.964412 verbo.47247 > sparky.24: S 2401927088:2401927088 (0) win 2048
09:40:43.964465 verbo.47247 > sparky.1547: S 2401927088:2401927088 (0) win
2048
09:40:43.964553 verbo.47247 > sparky.2564: S 2401927088:2401927088 (0) win
2048
09:40:43.964604 verbo.47247 > sparky.1484: S 2401927088:2401927088 (0) win
2048
09:40:43.964642 verbo.47247 > sparky.1460: S 2401927088:2401927088 (0) win
2048
Transcribed Image Text:09:40:43.964215 verbo.47247 > sparky.1548: S 2401927088:2401927088 (0) win 2048 09:40:43.964412 verbo.47247 > sparky.24: S 2401927088:2401927088 (0) win 2048 09:40:43.964465 verbo.47247 > sparky.1547: S 2401927088:2401927088 (0) win 2048 09:40:43.964553 verbo.47247 > sparky.2564: S 2401927088:2401927088 (0) win 2048 09:40:43.964604 verbo.47247 > sparky.1484: S 2401927088:2401927088 (0) win 2048 09:40:43.964642 verbo.47247 > sparky.1460: S 2401927088:2401927088 (0) win 2048
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