You aredesigning an Ethernet router/firewall/network address translatorusing an

Question

1. You aredesigning an Ethernet router/firewall/network address translatorusing an embedded linux operating system to control thedevice. One of the things that needs to be stored on a longterm basis in the device is the access log of IP addresses and portnumbers that have attempted to access machines behind thedevice. Think of this device as the home router behind yourcable, DSL or FIOS modem. It is desirable to store at least256 IP addresses and port numbers, each requiring about 32 bytes ofinformation. Contrast at least two of the options for thememory technology that might be employed for this access logstorage: static CMOS RAM, dynamic MOS RAM, Flash,electrically alterable ROM or mask programmed ROM.

Explanation / Answer

Dear, when we are designing an Ethernet router/firewall/networkaddress translator using an embedded linux operating system tocontrol the device.One of the things that needs to be stored on along term basis in the device is the access log of IP addresses andport numbers that have attempted to access machines behind thedevice.The below two options for the memory technology thatmight be employed for this access log storage. 1.Static CMOS RAM :It is a type of semiconductor memory where the wordstatic indicates that, unlike dynamic RAM,it does not need to be periodically refreshed, as SRAMuses bistable latcing circuitry to store each bit.
2.Mask programmed ROM : in this Specialmasks are used when the chip is made,so that the content of everymemory location is fixed from the beginning. It can never bealtered.

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