Answer:
2 lines
Explanation:
The "w" flag will overwrite any content, so the existing 80 lines are lost.
Then, if you write two lines, there are two lines in the file.
You could argue that the final newline character causes a third line to be present, but logically, there are two lines.
Answer:
spanning-tree portfast bpduguard
Explanation:
spanning- tree protocol (STP) is a layer 2 protocol in the OSI model. It is automatically configured in a switch to prevent continual looping of BPDUs, to avoid traffic congestion. The fastport bpduguard is only applicable in non-trunking access in a switch. It is more secure to configure the fastport mode in switch port connected directly to a node, because there are still bpdus transfer in a switch to switch connection.
BPDUs Guard ensures that inferior bpdus are blocked, allowing STP to shut an access port in this regard.
