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Linux ⦁ From the following iptable rules – will the IP address – 163.172.2.10 - be...

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⦁ From the following iptable rules – will the IP address – 163.172.2.10 - be allowed to connect on port 25? Why or why not? (3pt):

-A INPUT -s 202.46.32.0/19 -j DROP -m comment --comment "server - Group: script-kiddies - drop"

-A INPUT -s 163.172.0.0/16 -j DROP -m comment --comment "server - Group: script-kiddies - drop"

-A INPUT -s 86.62.64.0/18 -j DROP -m comment --comment "server - Group: script-kiddies - drop"

-A INPUT -s 94.185.83.64/26 -j DROP -m comment --comment "server - Group: script-kiddies - drop"

-A INPUT -s 193.189.116.0/23 -j DROP -m comment --comment "server - Group: script-kiddies - drop"

-A INPUT -s 31.184.195.26 -j DROP -m comment --comment "server - Group: script-kiddies - drop"

-A INPUT -s 192.168.128.0/20 -j ACCEPT -m comment --comment "server - Object: localnet - accept"

-A INPUT -s 127.0.0.1 -j ACCEPT -m comment --comment "server - Object: local - accept"

-A INPUT -s 127.0.0.2 -j ACCEPT -m comment --comment "server - Object: local2 - accept"

-A INPUT -p tcp --destination-port 25 -j DROP -m comment --comment "server - Proto: 25 - drop"

-A INPUT -p tcp --destination-port 842 -j DROP -m comment --comment "server - Proto: 842 - drop"

⦁ What is the difference between SPF and DKIM records? (2pt)

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Answer #1

-A INPUT -s 163.172.0.0/16 -j DROP -m comment --comment "server - Group: script-kiddies - drop"

-A INPUT -p tcp --destination-port 25 -j DROP -m comment --comment "server - Proto: 25 - drop

this statement will not allow 163.172.2.10 to communicate

diffrence between SPF and DKIM

1. DKIM protects email from being altered in transit, SPF does not.

2.SPF checks the IP of the last SMTP server hop against an authorized list whereas DKIM validates the mail was initially sent by a given domain, and warrantees its integrity.

3.

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