11. Distribution layer lies in
between the Core layer and
Access layer. It usually
deals with the following:
1.
Security
2.
Access Control Lists
3.
Route Summarization
4.
Media translation
12. Some important port numbers
to know:
-
HTTP uses port number 80.
-
FTP uses port number 21
-
SMTP uses port number 25
-
Telnet uses port number 23
-
TFTP uses port number 69