Computer Networks Programming

IMPLEMENTATION OF NAT IN CISCO PACKET TRACER Network address translation  ( NAT )  is a method of remapping one IP  address space  into another by modifying  network address  information in the  IP header  of packets while they are in transit across a traffic  routing device .  The main use of NAT is to limit the number of public IP addresses an organization or company must use, for both economy and security purposes. NAT inside and outside addresses : Inside refers to the addresses which must be translated. Outside refers to the addresses which are not in control of an organization. These are the network Addresses in which the translation of the addresses will be done. ·      Inside local address –  An IP address that is assigned to a host on the Inside (local) network. The address is probably not a IP address assigned by the service provider i.e., these are private IP address. This is the insi...

The DHCP (dynamic host configuration protocol) is a standardized network protocol which is used in internet protocol (IP) networks. DHCP is used to assign IP automatically to the system with the help of a machine called DHCP server. A DHCP server enables computers to request IP addresses and networking parameters automatically. In the absence of a DHCP server, each computer on the network needs to statically (manually)  assigned to an IP address. Static IP addresses are usually assigned to routers, management interfaces on switches, servers and other devices in the network which do not change location either physically or logically. Static IP addresses are also used to access and manage these devices remotely. On the other hand, user devices such as computers, smartphones, IP phones and others are likely to change their locations either physically or logically. This means that assigning them static IP addresses would be an unviable solution. DHCP is a protocol that w...