Phishing,
scammers send emails claiming to be reputable companies asking for personal information.
Answer:
c. $_SERVER
Explanation:
$_SERVER is an array in PHP containing information about headers, paths, and script locations.
Example usage:
echo $_SERVER['HTTP_HOST'];
This will print information about HTTP_HOST header.
echo $_SERVER['DOCUMENT_ROOT'];
This provides information about document root path.
echo $_SERVER['SCRIPT_FILENAME'];
This provides information about the currently executing script.
Answer:
The fields of the IPv4 header change from router to router is:
- No Fragmentation - TTL, checksum(due to TTL).
- Fragmentation - Total length field, fragment M bit.
Explanation:
TTL - TTL stands for Time-TO-Live, it is important in an IP(Internet Protocol) packets that says a network router if or not the packets have been in the network so lengthy and should be rejected.
Fragmentation - It is done through the network layer when the mostly size of data-gram is higher than max size of data that can held a frame.
It is done through the network layer at the end side and is generally done at routers.
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