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 does a LAP do if it loses communication with it's WLC?
Reboots and searches for a new WLC
Half because transmitting and receiving stations use the same frequency
Up to 54Mbps - not cross-compatible - 12 to 23 clean channels - 5.8 Ghz
Roughly 2000


2. When should CDP be enabled?
The TOS field in the header is used. 2 methods 3 bits or 6 bits
Only for trusted Cisco gear - especially phones
Between interfaces that are assigned to L2 VLANs or L2 trunks
Per VLAN


3. How is an instance defined?
On ports where you never expect to find a root bridge for a VLAN
1/2 and 3/6
By name - config revision - and instance to vlan mapping table
Checks the destination MAC in the header against the target MAC in the ARP reply


4. Where does VRRP send advertisements?
A private VLAN can be logically associated with a special secondary vlan
Use the spanning-tree root macro
Multicasts to 224.0.0.18 (VRRP)
Based on priority (0-255). Default is 100. Highest IP is tie breaker


5. What ILP mode are all ports in by default?
By name - config revision - and instance to vlan mapping table
802.1x with EAP over LAN (EAPOL)
Auto mode
The switch adds its MAC to the option 82 field so that the DHCP reply echoes back the switch's own information


6. where does L2 switching occur?
Between interfaces that are assigned to L2 VLANs or L2 trunks
Using a mobility exchange message
Sends a voltage across the receive pairs to detect a 25k ohm resistance
Plain text or md5


7. For QoS - switch uplinks should always be considered as ____ _____?
802.1w
Trusted ports
Enables portfast - sets the port to access and disables PAgP
Up to 54Mbps - not cross-compatible - 12 to 23 clean channels - 5.8 Ghz


8. can root guard and udld be used together?
Connects with SONET or SDH
Only for the offending VLAN on the port
Yes
Roughly 50%


9. what I s distributed CEF (dCEF)?
Will trunk if asked
CEF is distributed completely among multiple L3 forwarding engines.
Trusted ports
That they aren't using the same frequencies.


10. How much BW does a voip connection use?
No shut
12 kbps with headers and compression
It is enabled by default on all CEF capable switches
Some unused bits are used to allow a port to identify its role and state. Also the BDPUs state that they are V2 BDPUs


11. What does the switchport host macro do?
Backbonefast uses RLQ to determine if upstream switches have stable connections to root bridge
Only for trusted Cisco gear - especially phones
Sets the switchport mode to access - enables portfast - and turns off channel grouping for the port
Switching Database Manager - configures and prunes TCAM partitions


12. What is NSF?
To the virtual port-channel interface
Nonstop forwarding is an interactive method focusing on rebuilding the RIB after SUP switchover
Matching SSID - compatible data rate - authentication credentials
Switches make an effort to move packets as quickly as possible


13. what should you do if you expect a PAgP capable switch at the other end vs. a server or host?
Etherchannel ports have inconsistent config
A point to point port type
Port with best root path cost on segment
Configure non-silent submode


14. Where is the QoS trust boundary usually configured on an IP phone?
By configuring every switch port to have an expected and controlled behavior
Routers at the distribution layer become the bottlenecks or broadcast or multicast traffic slows the switches in the switch block
2-8 FE - GE - or 10GE are bundled.
Usually QoS from VOIP but not PC dataa


15. What are the 4 steps in DHCP negotiation?
A point to point port type but the neighboring device runs traditional 802.1D STP
When the AP uplinks to an Ethernet network.
Gateway load balancing protocol - cisco proprietary
1-client sends DHCP discover as broadcast - 2-DHCP server sends DHCP offer - client sends DHCP Request - DHCP server sends DHCP ack


16. How many tunnels exist between the LAP and WLC?
To the virtual port-channel interface
With portfast
Route processor redundancy - redundant sup is partially booted and initialized and must reload module in the switch and init all sup functions
2 - one for control messages and one for data


17. How much overlap should a wireless repeater have?
Either desirable or auto mode
Roughly 50%
Compatible with 802.11b - up to 54Mbps in 12 data rates - 3 channels - 2.4Ghz
The frame tag includes a 3 bit COS value from 0 (low) to 7 (high). Native vlans are untagged so no COS


18. What is the size of ISL encapsulation?
Every switch and router in a network must be configured with appropriate QoS features and policies
Determines when the AVG will stop using the old VMAC in ARP replies
By short-circuiting the max age timer
26-byte header - 4-byte trailer with CRC


19. When are RSTP bdpus sent?
Yes to both
Checks the source MAC in the header against the sender MAC in the ARP reply
Every hello interval regardless of whether BDPUs are received from root - allowing any switch to take an active role maintaining the topology
PAgP (Cisco proprietary) and LACP (standards-based)


20. What is the STP blocking state?
Completed dhcp bindings - mac addresses - IP addresses - etc.
Frames are forwarded
Can hear only BDPUs
The standby becomes active and stays active by default. Preemption can be configured


21. How do you prevent switch spoofing?
Configure non-silent submode
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
By configuring every switch port to have an expected and controlled behavior
One that can be detected on a switch interface (ie. Up/down)


22. What is the distribution layer best practice?
The distribution layer should have only L3 links
Data goes over native vlan - voice goes over specified VLAN - voice QOS is 802.1p
When a wireless station transmits a frame - the receiving one must send an ack
A router keeps a routing table and an ARP table. The FIB combines them for every next-hop entry


23. How many potential links can LACP define?
16 - of which up to 8 are active. The others are in standby
They should be an unconditional Etherchannel because the WLC can't negotiate a channel.
FIB
26-byte header - 4-byte trailer with CRC


24. What is a cell?

Warning: Invalid argument supplied for foreach() in /var/www/html/basicversity.com/show_quiz.php on line 183


25. What are the 6 steps to configure 802.1x for port security?
1-enable AAA on switch - 2-define RADIUS servers - 3-define authentication method - 4-enable 802.1x on switch - 5-conf. 802.1x ports - 6-allow hosts
1- enable qos - 2-define qos parameters to be trusted - 3-make trust conditional - 4-instruct IP phone how to extnd boundary
300 sec
Option 43


26. How does Root Guard work?

Warning: Invalid argument supplied for foreach() in /var/www/html/basicversity.com/show_quiz.php on line 183


27. What is the cost of a 100Mbps link?
If a proposal is received - the recipient isolates - all nonedge ports blocked until proposal sent causing neighbors to synch - which propagates out in waves
19
Needs hardware upgrade over WEP - uses AES encryption
16 bits (8b port priority - 8b port number)


28. Where is UDLD enabled?
All ports where root isn't expected
Manually
A host port goes up or down
All fiber-optic links between switches (must be enabled on both ends)


29. What is PVST plus (PVST+)?
Allows devices to interoperate with PVST and CST. Can use both dot1q and ISL
No
Control functions
A path is pre-arranged for priority along the complete path from source to destination using the RSVP protocol.


30. If a port is configured for errdisable auto recovery - how long does it stay down?
Isolated and community
300 sec by default
They shorten their bridge table aging times from default (300sec) to the fowarding delay (15 sec)
Port stays up - but packets from violating MACs are dropped. Switch logs violating packets


31. How are BDPUs spread?
Aggregation - high L3 throughput - security and policy based connectivity functions through access lists and packet filters - QoS - scalable high-speed links
Low cost - high density ports - multiple scalable uplinks - vlans - traffic and protocol filtering and QoS
Each network device handles packets individually with no advance reservations
Multicast to 01-80-c2-00-00-00


32. How do you configure DAI for statically configured IP addresses?
Control functions
By an ARP access list that defines the permitted bindings
Only when a nonedge port transitions to forwarding
Each physical interface has a different IP address. All physical interfaces point to a virtual interface called the standby address or VIP


33. What is RPR+?

Warning: Invalid argument supplied for foreach() in /var/www/html/basicversity.com/show_quiz.php on line 183


34. How does a DAI enabled switch gather trusted ARP info?
Use the spanning-tree root macro
Access or trunk
Very high L3 throughput - no access lists or port filtering - redundancy and resilience - advanced QoS
From the DHCP snooping database or from static entries


35. What is topology-basec caching?
1-(opt) set system priority - 2-select interface(s) - 3-assign the protocol - 4-set the mode - 5-(opt) set the port priority
The topology is pre-populated by downloading the topology DB into the FIB and dynamically updated. Called Cisco Express Forwarding
1500B
The station can transmit immediately and wait for an ack


36. What is the default MTU?
Round robin - weighted - or host-dependent
1500B
Determines when the AVG will stop using the old VMAC in ARP replies
VTP server for domain null with no password or secure mode


37. How does the standby handle ARP issues after it becomes active?
Globally or per-port
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
By sending a gratuitous ARP
Up to 4 can be used in a group. Called active virtual forwarders (AVF)


38. What data does DHCP snooping track?
When each AP stands alone within the larger network.
Completed dhcp bindings - mac addresses - IP addresses - etc.
By an ARP access list that defines the permitted bindings
PAgP (Cisco proprietary) and LACP (standards-based)


39. What is DSCP codepoint AF31(26)?
On by default
Sends special layer 2 UDLD frames and expects an echo. Both ends must be configured for UDLD
When each AP stands alone within the larger network.
Flash (class 3)


40. What is a bridge ID made up of?
A point to point port type but the neighboring device runs traditional 802.1D STP
Multicasts to 224.0.0.18 (VRRP)
The time that a port spends in both listening and learning states . Default 15 seconds
Bridge priority and MAC


41. How does HSRP port tracking work?

Warning: Invalid argument supplied for foreach() in /var/www/html/basicversity.com/show_quiz.php on line 183


42. What does uplinkfast do?
Via an 802.1Q trunk or a single VLAN access port
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.
Differentiated services
Access or trunk


43. What categories can ports be in with dhcp snooping enabled?
Single instance of STP for all VLANs. BDPUs are sent over trunks using the native VLAN with untagged frames. Dot1q based
Trusted or untrusted
Full duplex
No


44. How many virtual MACs can GLBP have?
L2
Hosts within a secondary can communicate with each other and with the primary - but not with another secondary vlan
Up to 4 can be used in a group. Called active virtual forwarders (AVF)
A MAC is seen on a different port


45. How does HSRP gateway addressing work
When the AP uplinks to an Ethernet network.
LACP port priority
Each physical interface has a different IP address. All physical interfaces point to a virtual interface called the standby address or VIP
Gateway load balancing protocol - cisco proprietary


46. What must the other end be set to if PAgP desirable or LACP active mode is selected?
Either desirable or auto mode
Forces the router to wait for a period of time before attempting overthrow
Differentiated services code point
When the AP uplinks to an Ethernet network.


47. RSTP forwarding state
Checks the source MAC in the header against the sender MAC in the ARP reply
Frames are forwarded
VTP server for domain null with no password or secure mode
Listens to the first packet going to router and away from the router. If it can switch in both directions - it learns a shortcut path so subsequent packets can be switched without the RP


48. What are the 2 types of BDPU?
Distribution layer
Configuration and TCN
Used when there are 1 or more VLANs mapped to a single STP instance
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


49. what do multilayer switches do?
Both layer 2 switching and IVR
Embeds the tag within the frame
Yes
Collision domain


50. What is an isolated secondary VLAN?

Warning: Invalid argument supplied for foreach() in /var/www/html/basicversity.com/show_quiz.php on line 183