Which protocol do Domain Name System (DNS) and Dynamic Host Configuration Protocol (DHCP) use?

The unit of data exchanged between two peer MAC entities using the services of the physical layer is a(n) ____________.

A. extended service set B. MPDU C. MSDU D. station

A phantom deadlock __________.

a) is an example of resource deadlock b) occurs in the presence of circular waits for communication signals c) occurs when a process that holds a shared resource fails d) none of the above.