2. What is Firewall?
The firewall shields the internal corpora
te network from the Internet.
3. What is FTP?
FTP is an acronym for File Transfer Proto
col. As the name suggests, FTP is used to
transfer files between computers on a net
work, such as the Internet.
4. How to distinguish
Based on the information in the headers,
the screening router allows certain packe
ts to be sent or recieved, but blocks oth
er packets.
5. What is packet?
Packet is a formatted unit of data carrie
d by a packet mode computer network. Com
puter communications links that do not su
pport packets, such as traditional point-
to-point telecommunications links, simply
transmit data as a series of bytes, chara
cters, or bits alone.
