free plagiarism

answer one 

One of the security concerns of an RFID system is the tag authenticity of RFID, because it makes only authorized applications to be able to output valid tags, also RFID tags are autocratic, consequently any reader can have access to them and then read them and this makes the unauthorized reader be able to scan them without any obstruction. The tag privacy of RFID makes only authorized applications to be able to identify the tags, negative spying on tag is possible at a short distance which makes it a security concerns issue of RFID system. Stealing and storing private data can be very risky on the Identity theft of RFID chip because it is easy.

One key security concern is unauthorized tracking of RFID tags. An adversary with an appropriateRFID reader can track the locations of the items tagged using RFID tags. This becomes quite seriousif the item is sensitive in nature, for example, a passport, and the tag can be used to retrieve furtherinformation, for example, the nationality and other personal information of the person holding thepassport. Another security concern is the ability of a reader to change tag information. This can beused by an adversary to, for example, change the price of a tagged item he plans to buy. 

answer two  

There are various reasons that why these protocols invented a new abstract ID (port numbers), instead of using process IDs. The single process ID is not eligible to be used to distinguish between channels after a single process establish multiple channels of communications. Also process ID is not static, therefore, it cannot be used for common services, for example HTTP and this is because process ID is assigned in a dynamic matter to the process when a process is made.Also, process IDs will make UDP and TCP protocols operating system dependent because process IDs is operating system specific