COMPUTER THREATS SECURITY
WHAT IS A FIREWALL IN NETWORK SECURITY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Make filtering (allow/deny) decisions based on packet header information.
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Log all network traffic
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Perform email filtering.
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Filter log files.
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Detect various attacks and intrusions, helping to protect the environment.
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Detailed explanation-1: -iptables is a user-space utility program that allows a system administrator to configure the IP packet filter rules of the Linux kernel firewall, implemented as different Netfilter modules. The filters are organized in different tables, which contain chains of rules for how to treat network traffic packets.
Detailed explanation-2: -Using IPtables, you can prevent unauthorized systems from initiating network connections to the log server. The filtering function of IPtables can secure access to the replication log server (connections to and from the log server), allowing filtering of all inbound and outbound data at the packet level.
Detailed explanation-3: -Static Packet Filter This type of firewall decides whether to accept or deny individual packets, based on examining fields in the packet’s IP and protocol headers.
Detailed explanation-4: —dport-Sets the destination port for the packet. Use either a network service name (such as www or smtp), port number, or range of port numbers to configure this option.