useiptablesWrite a rule that doesn't allow172.16.0.0/16Which of the following rules is correct?

• A.iptables -t fielter -A INPUT -s 172.16.0.0/16 -p all -j DROP
• B.iptables -t fielter -P INPUT -d 172.16.0.0/16 -p all -j ACCEPT
• C.iptables -t fielter -P INPUT -s 172.16.0.0/16 -p all -j DROP
• D.iptables -t fielter -P INPUT -s 172.16.0.0/16 -p all -j ACCEPT

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aboutL2TPThe sequence of the call establishment process in the corridor, which of the following descriptions is correct?
1. EstablishL2TPtunnel
2. EstablishPPPconnect
3. LNSAuthenticate the user
4. User access to intranet resources
5. EstablishL2TPconversation

• A.2->1->5->3->4
• B.2->3->1->5->4
• C.1->2->3->5->4
• D.1->5->3->2->4

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In the process of using the digital envelope, which of the following information will be encrypted? (Multiple choice)

• A.Recipient's public key
• B.User data
• C.Symmetric key
• D.Receiver's private key

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Regarding the description of the authentication of Internet users and VPN access users, which of the following is wrong?

• A.The process of local authentication or server authentication for online users is basically the same, both of which authenticate users through authentication domains, and the user triggering methods are also the same
• B.Internet users and VPN access users share data, and user attribute checks (user status, account expiration time, etc.) are also effective for VPN access
• C.After VPN users access the network, they can access the network resources of the corporate headquarters, and the firewall can control the accessible network resources based on the user's name
• D.After being authenticated, VPN access users will be online at the same time on the user online list

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HTTPmessage usageUDPcarry, andHTTPSprotocol based onTCPthree-way handshake, soHTTPSSafer and more recommendedHTTPS.

• A.True
• B.False

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