Instructions:

• Answer 50 questions in 15 minutes.
• If you are not ready to take this test, you can study here.
• Match each statement with the correct term.
• Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.

1. What is NSF?
Only when a nonedge port transitions to forwarding
Makes use of the DHCP snooping database and static ip source binding entries. If enabled - switch will test addresses
Nonstop forwarding is an interactive method focusing on rebuilding the RIB after SUP switchover
Any ports associated with an isolated vlan can reach the primary - but not any other secondary. Hosts withn an isolated vlan can't reach each other


2. What's the easiest way to configure GLBP timers?
Configure the timer on the AVG and let it propagate
If a proposal is received - the recipient isolates - all nonedge ports blocked until proposal sent causing neighbors to synch - which propagates out in waves
Collision domain
Disabled - blocking - listening - learning - forwarding


3. What is SSO?

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4. How is the HSRP MAC address configured?
10-15%
0000.0c07.acxx where xx is the group number as a 2-digit hex value
Auto mode
1-LAP gets a DHCP address - 2-LAP learns IP of available WLC - 3-LAP sends a join request to WLC and receives join reply - 4-WLC sends code image - if necessary - 5-Tunnels are created


5. How does HSRP port tracking work?

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6. If a port is configured for errdisable auto recovery - how long does it stay down?
10-15%
300 sec by default
Switching Database Manager - configures and prunes TCAM partitions
Weak key rotation


7. What is the 80/20 rule?
Data and voice over native vlan no QOS and no 802.1p trunk
Differentiated services code point
Controls where candidate root bridges can be connected and found on a network
80% of the user traffic should stay in the VLAN


8. What is the STP forwarding state?
Data goes over native vlan - voice goes over specified VLAN - voice QOS is 802.1p
Interim solution - uses same hardware as WEP - but uses TKIP encryption
The frame tag includes a 3 bit COS value from 0 (low) to 7 (high). Native vlans are untagged so no COS
After another forwarding delay - the port can send and receive data frames - collect MAC addresses - and send and receove BDPUs


9. How are multiple VLANs mapped to multiple SSIDs?
Multicast to 01-80-c2-00-00-00
By using a trunk link
Matching SSID - compatible data rate - authentication credentials
Stateful switchover - redundant sup is fully booted and init'd. Both start and run config are synched as is L2 information - and switchinterfaces.


10. How is root port decided upon?
Immediate (class 2)
Lowest cumulative cost to root
1 per segment
Globally or per-port


11. How should backbonefast be configured?
On all switches in network to enable RLQ request and reply
LACP port priority
Completed dhcp bindings - mac addresses - IP addresses - etc.
1 -2 -5.5 and 11 Mbps - Channels 1/6/11 - 2.4Ghz


12. What does the epoch number indicate when looking at cef entries?
19
When the AP uplinks to an Ethernet network.
The number of times the CEF table has bee flushed and regenerated as a whole
Another router must have a higher HSRP priority and have preemt set up


13. How often are VRRP advertisements sent?
RADIUS
1 second. Backup routers can learn the interval from the master
Can send and receive BDPUs
An AP's coverage area


14. What are the steps of RSTP convergence?
If a unidirectional link is detected - the switch doesn't try to reestablish the link. ULD msgs are sent once/sec for 8 seconds - then the port is err-disabled
Lowest cumulative cost to root
Controls where candidate root bridges can be connected and found on a network
1- root bridge is elected - 2-the state of eery switch port in the STP domain must be brought from blocking state to the appropriate state


15. What is a drop adjacency?

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16. One vlan should =
0-255 (lower is better)
Best effort delivery - integrated services model - and differentiated services model
Roughly 50%
1 IP subnet


17. How is UDLD configured?
All ports where root isn't expected
Can send and receive BDPUs
A MAC is seen on a different port
Per-port or globally for all fiber-optic ports. Can be enabled globally - but will only affect fiber ports


18. Define VRRP
Only on ports that have same static VLANs or trunking. It also modifies parameters of the channel if one of the ports is modified
By short-circuiting the max age timer
A host port goes up or down
Virtual Router Redundancy Protocol - pretty much the same as HSRP


19. What does uplinkfast do?
Discarding - learning - forwarding
Enables switches at the end of the spanning tree branches to have a functioning root port while keeping 1 or more redundant potential ports in blocking mode. When the main fails - the other comes up.
2 - one for control messages and one for data
The RP listens to a flow's 1st packet for the dest. The SE listens to the packet and dest and puts a shortcut in the MSL cache. Netflow switching - route once - switch many


20. What is the STP blocking state?
Discarding - learning - forwarding
On (all ports channel) - auto (channels when asked) - and desirable(actively asks to form a channel)
Can hear only BDPUs
Change in trunk encap


21. What types of link can an etherchannel be?
80% of the user traffic should stay in the VLAN
During the time that the FIB entry is in CEF glean waiting for ARP entries - subsequent packet to that host are dropped to keep input queues from filling
Data and voice over native vlan - no QOS but still uses 802.1p trunk
Access or trunk


22. Where shoul dmultilayer switches be implemented?
They shorten their bridge table aging times from default (300sec) to the fowarding delay (15 sec)
Distribution layer
CEF is distributed across multiple L3 forwarding engines - typically on Catalyst 6500 line cards each having only a subset
Configure and enable DHCP snooping


23. What is the distribution layer best practice?
Set the native VLAN of a trunk to a bogus or unused VLAN ID then prune the native VLAN off both ends of the trunk
They must be carried over a voice VLAN (VVID) or over a regular data VLAN (ie. The native VLAN or the PVID)
The distribution layer should have only L3 links
Hosts within a secondary can communicate with each other and with the primary - but not with another secondary vlan


24. What are the caveats for HSRP port tracking?
Matching SSID - compatible data rate - authentication credentials
Another router must have a higher HSRP priority and have preemt set up
Checks the destination MAC in the header against the target MAC in the ARP reply
They shorten their bridge table aging times from default (300sec) to the fowarding delay (15 sec)


25. What is layer 2 roaming?
Packets are discarded due to an ACL or policy action
If the client maintains the same IP address as it roams between Aps. All must have same VLAN - SSID - and subnet
Access or trunk
VTP server for domain null with no password or secure mode


26. What is the PVLAN host mode?
For hosts that doesn't understand routing - the DGW is configured to reply with its own mac
Needs hardware upgrade over WEP - uses AES encryption
1-lowest root bridge ID - 2-lowest root path cost - 3-lowest bridgeID - 4-lowest port ID
Connects to a host on an isolated or community vlan. Communicates only with promiscuous port or ports on same community vlan


27. What is a cell?

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28. On what scope is DAI enabled?
Roughly 50%
Per VLAN
Needs hardware upgrade over WEP - uses AES encryption
1 second. Backup routers can learn the interval from the master


29. What 2 conditions does IP source guard check for?
A point to point port type
The campus network's backbone
Incoming frames are dropped (combination of disabled - blocking - and listening)
Source IP and MAC must match those addresses learned by DHCP snooping or a static entry


30. What is the acceptible range of VLANS?
Cisco ILP and 802.3af
The station must wait until the frame in progress has completed - then wait a random amount of time before transmitting
1-1005 (1 and 1002-1005 are reserved)
The number of STP instances needed ot support the desired topologies and whether to map a set of VLANs to each instance


31. What is a null adjacency?
Checks the source MAC in the header against the sender MAC in the ARP reply
The port asks the other end to trunk
Only a single host connects . If one BDPU is received - it is no longer an edge port
Used to switch packets destined for the null interface


32. What are the 2 choices for VLANs with IPT?
All fiber-optic links between switches (must be enabled on both ends)
Normal and aggressive
Incoming frames dropped - but MACs learned
They must be carried over a voice VLAN (VVID) or over a regular data VLAN (ie. The native VLAN or the PVID)


33. What does the switchport host macro do?
Switching Database Manager - configures and prunes TCAM partitions
It updates the L2 headers with the proper src and dst MAC - L3 TTL - L3 checksum - and L2 checksum information
Enables portfast - sets the port to access and disables PAgP
Distribution layer


34. What does DTP do?
A host port goes up or down
Only for the offending VLAN on the port
2 seconds (def)
Automatically negotiates a common trunk mode between switches


35. What categories can ports be in with dhcp snooping enabled?
An AP's coverage area
MAC of the end device
Trusted or untrusted
As a VLAN access map


36. What is a service set?
Real-time functions such as beacons and probes - encryption and interactions with the client at L2
Tracks of BDPUs on nondesignated ports. When those BDPUs stop coming - the port is put into loop-inconsistent state and blocks
A group of wireless devices that share a common SSID
Route processor redundancy - redundant sup is partially booted and initialized and must reload module in the switch and init all sup functions


37. How does GLBP work?
134 bits
1/2 and 3/6
Single instance of STP for all VLANs. BDPUs are sent over trunks using the native VLAN with untagged frames. Dot1q based
Routers are assigned to common GLBP group. All routers can be active and can load balance


38. By default - what layer do catalyst switchports operate on?
Manages addition - deletion and renaming VLANs across the network
Used to switch packets that can't be forwarded normallly due to an encapsulation failure - unresolved address - unsupported protocol - etc.
L2
Stateful switchover - redundant sup is fully booted and init'd. Both start and run config are synched as is L2 information - and switchinterfaces.


39. What is a community secondary VLAN?
Switch(config-if)# standby xx where x= group number
Configure non-silent submode
MAC addresses are learned from the source MAC of incoming frames. If the destination address is unknown - the frame is flooded out all except the receiving port.
Hosts within a secondary can communicate with each other and with the primary - but not with another secondary vlan


40. What is DSCP codepoint AF31(26)?
1 to 64
Packets must be sent to the L3 engine for further processing
If the switch or the powered device doesn't suport power class discovery
Flash (class 3)


41. What must be supported for port-based security to occur?
7 switches from root bridge
Configure non-silent submode
Root - designated - alternate - and backup
802.1x with EAP over LAN (EAPOL)


42. WPA2 encryption
Needs hardware upgrade over WEP - uses AES encryption
Promiscuous and host
Port that connects to another switch and becomes a designated port
On root - because the root bridge propagates timers with config BDPU


43. How many users should be within a switch block?
When a port moves into forwarding or from fowarding or learning to blocking.
Roughly 2000
On (all ports channel) - auto (channels when asked) - and desirable(actively asks to form a channel)
Another router must have a higher HSRP priority and have preemt set up


44. What is a wireless mobility group?
1-ID link path costs - 2-ID roodt bridge - 3-select root port (1/switch) - 4-select designated port (1/segment) - 5-ID blocking port
No
A client can roam to any WLC as long as it stays in a mobility group
Cisco proprietary. 1 instance of STP/VLAN. Requires ISL instead of dot1q


45. What is arp throttling?
During the time that the FIB entry is in CEF glean waiting for ARP entries - subsequent packet to that host are dropped to keep input queues from filling
Yes to both
On (all ports channel) - auto (channels when asked) - and desirable(actively asks to form a channel)
By using an Ether-IP tunnel


46. What is the port number range?
It's a router that maintains routes (static or dynamic) - and populates the FIB
Once the CCM gives them the parameters - they use RTP
0-255
LACP port priority


47. In a converged fabric - which switch(es) send config BDPUs?
Group (0-255) - priority (1-254 254 is highest - 100 default)
Enables switches at the end of the spanning tree branches to have a functioning root port while keeping 1 or more redundant potential ports in blocking mode. When the main fails - the other comes up.
2 seconds (def)
Root


48. How are GLBP timers used?
The master router can share the VIP
Each peer sends and receives hellos. Def hello is 3 sec - def hold is 10 sec
Priority (class 1)
The wireless clients communicate directly with no other means of connectivity such as a WAP


49. What happens when the topology changes?

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50. How should the switch port to which a LAP be configured?
The total delay from start to finish
FIB
Access
Data goes over native vlan - voice goes over specified VLAN - voice QOS is 802.1p