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Java Programming Solved

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1. Packet Filtering Router Concept

The router acts as the entry and exit point of the network. The router is used as a firewall and the packet filtering firewall is the basic firewall. It protects the internal users by inhibiting the external network threats while transferring the packets and the 'Access Control List (ACL)' is used by the packet filtering routers. They provide data security for the packet transfer. An ACL is the list which contains the programmed statements for the router's interface. The router is connected with two networks such as private network and the outside network. It is possible to place ACL in either private network or outside the network. Because, the router has the ability for bidirectional screening of the IP packets. 

in - It controls the packets which are send through the router.

out - It controls the packets which are delivered via router.

An ALC List follows two principles and they are listed below:

• Sequential processing

• Deny all the packets, except the packets which are explicitly permitted to enter through the firewall.

There are some important parameters used for packet filtering. They are given below:

• Source IP address

• Destination IP address

• Type of encapsulated protocol such as UDP, TCP and so on.

• Incoming or outgoing interface.

There are two types of Access Control Lists as mentioned below:

• Standard ACL- It allows or restricts the data packets based on the source IP address.

• Extended ACL- It allows or restricts the data packets 

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