1. Question: What is the SSH login username?
Answer: When configuring SSH, if the local database is not called, then the user name can be arbitrary when ssh logs in, the password is Cisco
Router #line vty 0 4
Router (config-line) #transport input ssh
Router #password Cisco
2. Question: Is there the difference between a remote login with a user name and no user name?
Answer: (1) No username:
a. enable password b.line vty under password c.line vty call login
2 With user name
a. enable password b.line vty call local login c. global username and password
3. Question: After the software version is lost, the underlying crtl upgrade software version, which port is the network cable?
Answer: The network cable needs to be connected to the first port of the switch, but if the device has an MGMT interface, the network cable needs to be connected to the MGMT interface to upload the package properly.
4. Question: How does vrrp achieve vrrp master switching when the main upper-link line hangs up?
Answer: Set track probe on the upper junction of the main device, reduce the primary priority when the line is broken to achieve master switching, as follows:
Cisco (config) #int vlan 1
Cisco (config-if-VLAN 1) #vrrp 1 track G0/22 50 // Reduce its priority by 50 when the upper interface G0/22 is broken
5. Question: Will vrrp's virtual gateway mac change?
Answer: There will be no change in the same VRRP group, 00-00-5e-00-01-XX to indicate that the two-digit ten of the following XX is represented by the 16-bit corresponding to the group number of the VRRP group.
6. Question: What is the priority of VRRP by default?
Answer: The default priority for the VRRP group is 100 and the higher the priority, the higher the priority.
7.Question: In a VRRP+MSTP environment, will the standby machine immediately preempt master in the case of a low-priority (standby machine) vlan configuration vrrp [vid] preempt delay 180 host reboot?
Answer: No, low-priority vlanbackup is in the state and when the host restarts, the standby machine waits for 180s to preempt the master.
8. Question: How many times does the track retry default under VRRP?
Answer: Default 3 times
9. Question: Wh configure port isolation on the switch and find that some ports are not working?
Answer: Port isolation is only local which means that the switch is active and the cross-device is not effective. At the same time, if the port chip of the same device is not the same is not effective.
10. Question: Can port protection be configured after pvlan is configured on the switch?
Answer: Can be configured so that different groups vlan can be configured between floors for isolation and then port configuration port protection enables isolation of each port.
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