ICND2 Flashcards
What are the four major categories of PPP features?
Compression, Callback, Multilink, and Authentication
IOS Command: Enable PPP
interface config: encapsulation ppp
How is the STP root elected?
Lowest Bridge ID becomes root.
What is the STP Bridge IP?
Configured bridge priority prepended to MAC address.
How does a switch determine its STP root port? Place in order.
1 - lowest path cost to root
2 - lowest neighbor bridge id
3 - lowest port number
List the common STP costs for Ethernet up to TenGigabitEthernet
10Mbps 100
100Mbps 19
1Gbps 4
10Gbps 2
How is the designated bridge determined on each segment?
The same as STP root port:
1 - lowest path cost to root
2 - lowest neighbor bridge id
3 - lowest port number
What does a designated port do in STP?
It connects a non-root segment from the switches perspective.
What type of STP port connects to a designated port?
A non-designated blocking port or a root port.
List STP states in order
listening
learning
forwarding, blocking, disabled
Commands to set bridge priority
spanning-tree vlan vlan-id priority n
spanning-tree vlan vlan-id root primary
(secondary)
Single command to enable portfast and bpduguard
spanning-tree portfast edge bpduguard default
Cisco’s PVST and Rapid PVST require one to set bridge priority in increments of …
4096
What two components are unified when using Cisco Stackwise
Backplane and Administration
When a master switch is chosen what happens to the other switches in a Stackwise configuration.
The other switches reboot and adopt the master’s configuration.
What are the rules for electing a stack master
1) The current stack master remains the stack master
2) The switch with the highest member priority value
3) The switch with the non-default interface-level configuration
4) The switch with the higher hardware/software priority. (cryptography and ip services first)
5) The switch with the longest uptime
6) The switch with the lowest MAC address
What is another name for 802.1x
EAP (Extensible Authentication Protocol)
What standards are used to authenticate EAP.
Radius or TACACs
EAP = 802.1x
How does DHCP stop rogue DHCP servers?
By setting ports connected to valid DHCP servers as “trusted.” Untrusted ports receiving DHCP responses disable themselves.
Which VLAN should not be used as per Cisco best practices?
VLAN 1
Etherchannel obtains optimal load balancing over what number of links?
Powers of 2
2,4,8
Why does Cisco recommend against hardcoding etherchannel and not using PAGP or LACP?
Without PAGP or LACP if one side of the etherchannel is misconfigured it could cause a spanning-tree loop.
What are the PAgP commands?
channel-group n mode desirable
channel-group n mode auto
What are the LACP commands?
channel-group n mode active
channel-group n mode passive