Computer Engineering II, Quiz 3

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How are users authenticated in modern websites?

The server sets a cookie with a session ID associated with the server side code.

The user submits its login information with every request.

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Why are two separate ports used for encrypted and unencrypted versions of a protocol?

The encrypted transport behaves differently than the unencrypted transport.

It may be ambiguous whether the client is using encrypted or unencrypted requests

The unencrypted protocol was introduced first and adding encryption was not possible without breaking compatibility

Other:

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Does the sender of a mail always contact the destination mailserver directly?

Yes

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Does using an ISP provided DNS server reduce resolution time?

Yes, the server is closer to the user, hence latency is smaller.

No, the recursive lookup increases the time until the user receives a response

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When opening http://google.com in a modern browser, at least two connections will be opened. Why?

The HTTP (port 80) server redirects users to use HTTPS (port 443).

The server for domain google.ch redirects to the www.google.ch domain.

The browser opens additional connections to fetch resources in parallel

The clients issues HTTP/1.0 requests and needs to open a connection for each resource

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