Name two software tools used for OS guessing.(Choose two.

A.
Nmap

B.
Snadboy

C.
Queso

D.
UserInfo

E.
NetBus

Explanation:
Nmap and Queso are the two best-known OS guessing programs. OS guessing software has the ability to look at peculiarities in the way that each vendor implements the RFC’s. These differences are compared with its database of known OS fingerprints. Then a best guess of the OS is provided to the user.