Security in Computing 5th Edition by Shari Lawrence Pfleeger, Charles P Pfleeger, Jonathan Margulies

Exercise 44

The FTP protocol is relatively easy to proxy; the firewall decides, for example, whether an outsider should be able to access a particular directory in the file system and issues a corresponding command to the inside file manager or responds negatively to the outsider. Other protocols are not feasible to proxy. List three protocols that it would be prohibitively difficult or impossible to proxy. Explain your answer.

Step 1 of 2

Protocols Difficult to Proxy

The three protocols that would prohibitively difficult or impossible to the proxy include:

1. Internet Protocol (IP)

2. Transmission Control Protocol (TCP) and

3. User Datagram Protocols (UDP)