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questions in True or False

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True or False [20pt]
1. Two different webpages (https://cs.vt.edu/research/ and https://ece.vt.edu/research) can be
send over to a client over the same HTTP persistent connection.
2. User-agent: header field in HTTP request message is similar to HTTP cookies (i.e., it can be used
to uniquely identify a client).
3. The message body in a HTTP GET request is always empty.
4. HTTP can use either TCP or UDP as its transport layer protocol.
5. DNS uses UDP as its transport layer.
6. An SMTP transmitting server can use multiple intermediate SMTP servers to relay the mail
before it reaches the intended SMTP receiving server.
7. SMTP uses persistent connections - if the sending mail server has several messages to send the
receiving mail server, it can send all of them on the same TCP connection.
8. Web-based email does not use SMTP but instead uses HTTP for the entire mail transfer.
9. During CDN cluster selection, it is possible that geographically closest cluster does not always
yield smallest delay (best performance).
10. If a DNS server is non-authoritative for a particular hostname, then the DNS server cannot
contain a Type A record for the hostname.

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