Use a sequence diagram to describe the interactions among the participating processes.
Consider the Simple Mail Transfer Protocol (SMTP)4.An excerpt from the RFC for this protocol provides the following sample session.
```
R: 220 USC-ISI.ARPA Simple Mail Transfer Service Ready
S: HELO LBL-UNIX.ARPA
R: 250 USC-ISI.ARPA
S: MAIL FROM:
R: 250 OK
S: RCPT TO:
R: OK
S: DATA
R: 354 Start mail input; end with
S: Blah blah blah...
S: ...etc. etc. etc.
S: .
R: 250 OK
S: QUIT
R: 221 USC-ISI.ARPA Service closing transmission channel
```
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Answer the following statement true (T) or false (F)
A(n) _____ chart (sometimes called a column chart) is used to show comparisons.
Fill in the blank(s) with the appropriate word(s).
A virtual _______ replaces the ancient hardware ________ of the telephone days with software running in a virtual machine.
Fill in the blank(s) with the appropriate word(s).
Which of the following statements is true about PCIe adapters?
A) An x1 PCIe slot accepts only an x1 adapter. B) PCIe sends 8 bits at a time. C) PCIe sends 64 bits at a time. D) Any PCIe adapter can have any number of lanes assigned (from 1 to 32).