Test your basic knowledge |

CCNP Switch Deck

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. How is DHCP snooping enabled (scope)?
2 seconds
Globally
The topology is pre-populated by downloading the topology DB into the FIB and dynamically updated. Called Cisco Express Forwarding
1 IP subnet

2. How is the IPT 802.1 trunk negotiated?
Automatically using DTP and CDP
By name - config revision - and instance to vlan mapping table
If three are missed in a row - the neighbor is considered down and the data for that neighbor is aged
One router is the active virtual gateway - has highest priority or IP in group - answers all ARP requests and gives MAC based on load balancing

3. WPA2 encryption
Needs hardware upgrade over WEP - uses AES encryption
The station must wait until the frame in progress has completed - then wait a random amount of time before transmitting
It updates the L2 headers with the proper src and dst MAC - L3 TTL - L3 checksum - and L2 checksum information
If any BDUP is received on a port - it puts the port into the errdisable state

4. What is the cost of a 10Gbps link?
The time that a port spends in both listening and learning states . Default 15 seconds
The wireless clients communicate directly with no other means of connectivity such as a WAP
2
Disabled - init - listen - speak - standby - active

5. what do multilayer switches do?
Almost eliminates listening and learning states for single hosts on an access link
When each AP stands alone within the larger network.
Both layer 2 switching and IVR
Variation in delay

6. What is the STP disabled state?
Only for the offending VLAN on the port
After another forwarding delay - the port can send and receive data frames - collect MAC addresses - and send and receove BDPUs
Admin down
63 kbps

7. What is topology-basec caching?
With portfast
The topology is pre-populated by downloading the topology DB into the FIB and dynamically updated. Called Cisco Express Forwarding
Within a single MST region - an IST instances runs to work out a loop free topology between links where CST meets the region boundary and all switches in the region. It runs at the boundary.
All non-edge ports are discarding. After the root bridge is identified - the port with superior BDPU becomes root

8. Where should you change the network diameter value?
The L3 forwarding engine can't forward the packet in hardware because there is no L2 next-hop address - so the packet is sent to the L3 engine to generate the ARP response
Distribution
Cisco recommends only on the root bridge
Every switch and router in a network must be configured with appropriate QoS features and policies

9. RSTP designated port
Makes use of the DHCP snooping database and static ip source binding entries. If enabled - switch will test addresses
Port with best root path cost on segment
They must be carried over a voice VLAN (VVID) or over a regular data VLAN (ie. The native VLAN or the PVID)
A path is pre-arranged for priority along the complete path from source to destination using the RSVP protocol.

10. what I s distributed CEF (dCEF)?
Both layer 2 switching and IVR
The number of times the CEF table has bee flushed and regenerated as a whole
CEF is distributed completely among multiple L3 forwarding engines.
The standby becomes active and stays active by default. Preemption can be configured

11. What is the STP hello timer?
0000.0c07.acxx where xx is the group number as a 2-digit hex value
Time between BDPUs sent by root bridge. Default of 2 seconds
Edge - root - and point to point
Interim solution - uses same hardware as WEP - but uses TKIP encryption

12. What do you need to determine to use MSTP?
The number of STP instances needed ot support the desired topologies and whether to map a set of VLANs to each instance
63 kbps
A TCN BDPU is sent out of the switch's root port. The switch will continue sending TCN's every hello interval until ack'd by upstream neighbor. The root bridge will send a Config BDPU to all switches
A client can roam to any WLC as long as it stays in a mobility group

13. How does IPT behave when the voce VLAN is in the default none mode?
CEF is distributed across multiple L3 forwarding engines - typically on Catalyst 6500 line cards each having only a subset
1- enable qos - 2-define qos parameters to be trusted - 3-make trust conditional - 4-instruct IP phone how to extnd boundary
Data and voice over native vlan no QOS and no 802.1p trunk
1 -2 -5.5 and 11 Mbps - Channels 1/6/11 - 2.4Ghz

14. How should the switch port to which a LAP be configured?
BGP - EIGRP - OSPF - and IS-IS.
Access
If any BDUP is received on a port - it puts the port into the errdisable state
Hosts associated with a secondary VLAN can communicate with ports on the primary but not with another secondary VLAN

15. What is the switch block?
Using digital certificates
1/2 and 3/6
Used to switch packets that can't be forwarded normallly due to an encapsulation failure - unresolved address - unsupported protocol - etc.
Two distribution switches that aggregate one or more access switches

16. What is the acceptible range of VLANS?
Turn on port security
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
They should be an unconditional Etherchannel because the WLC can't negotiate a channel.
1-1005 (1 and 1002-1005 are reserved)

17. What is the GLBP group and priority range
Group (0-1023) priority (1-255 higher better def 100)
The DCF interframe space- the random backoff time before a wireless set can transmit
Regions and instances
The master router can share the VIP

18. How is an instance defined?
1 second. Backup routers can learn the interval from the master
Transmits keystrokes from phone and commands from CCM
Configuration and TCN
By name - config revision - and instance to vlan mapping table

19. If the WLC connects to an Etherchannel - how should the channel be configured and why?

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

20. In a converged fabric - which switch(es) send config BDPUs?
Manually
All nondesignated ports - but ok for all ports
Root
16 - of which up to 8 are active. The others are in standby

21. What are the restrictions for bundling into an Etherchannel?
TCAM
Global config (vlan - vtp mode - and vtp domain) and VLAN DB mode commands. Global config is preferred because VLAN DB mode commands are legacy
By short-circuiting the max age timer
Must be same type - speed - VLAN(s) - native vlan - pass the same set of vlans -duplex - and spanning tree settings

22. What is the adjacency table?
A router keeps a routing table and an ARP table. The FIB combines them for every next-hop entry
Automatically negotiates a common trunk mode between switches
When each AP stands alone within the larger network.
Sends a voltage across the receive pairs to detect a 25k ohm resistance

23. What is RPR?
By using an Ether-IP tunnel
1 IP subnet
No because they only participate if asked
Route processor redundancy - redundant sup is partially booted and initialized and must reload module in the switch and init all sup functions

24. Which fiber is the receive?
On the left as you face the connector
If the switch or the powered device doesn't suport power class discovery
2 seconds
Very high L3 throughput - no access lists or port filtering - redundancy and resilience - advanced QoS

25. What does IP source guard do?
The port will operate under 802.1D rules. If they are received on the same port - it will run 802.1D until the migration delay expires
Must be same type - speed - VLAN(s) - native vlan - pass the same set of vlans -duplex - and spanning tree settings
Makes use of the DHCP snooping database and static ip source binding entries. If enabled - switch will test addresses
1- enable MST - 2-enter MST config mode - 3-assign region name and region configuration rev - 4-map vlans to an MSTI - 5-show pending changes - 6- commit by exiting

26. How do you renable an err-disable port by default?
The link status stays up - but something between them has failed or is filtering traffic
CEF is distributed completely among multiple L3 forwarding engines.
Roughly 2000
Manually

27. How does IPT behave when the voice VLAN is in dot1p mode?
Data goes over native vlan - voice goes over VLAN0 - voice QOS is 802.1p
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
Incoming frames are dropped (combination of disabled - blocking - and listening)
It's a router that maintains routes (static or dynamic) - and populates the FIB

28. What is the default MTU?
1500B
FE - GE - and aggregated FE/GE Etherchannels
1 second. Backup routers can learn the interval from the master
A VLAN that spans the entire fabric

29. What is a baby giant frame?
Can send and receive BDPUs
The wireless clients communicate directly with no other means of connectivity such as a WAP
Frames that barely exceed 1518B or 1622B due to headers
Usually QoS from VOIP but not PC dataa

30. What is a vlan?
Root - designated - blocking - alternate - forwarding (host)
A single broadcast domain
Limits the number if dhcp requests on a port
Automatically negotiates a common trunk mode between switches

31. What are the steps to configuring HSRP MD5 authentication?
1-name the chain - 2-establish a key number - 3-create the key string - 4-apply the chain to the string
Between interfaces that are assigned to L2 VLANs or L2 trunks
Half because transmitting and receiving stations use the same frequency
Switch(config-if)# glbp xx where xx = group number

32. What are the steps of RSTP convergence?
Up to 54Mbps - not cross-compatible - 12 to 23 clean channels - 5.8 Ghz
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
1 second. Backup routers can learn the interval from the master
MAC of the end device

33. What is best effort delivery QOS?
Switches make an effort to move packets as quickly as possible
19
Cisco recommends only on the root bridge
They shorten their bridge table aging times from default (300sec) to the fowarding delay (15 sec)

34. What is an insignificant topology change?
A host port goes up or down
Root
The time that a port spends in both listening and learning states . Default 15 seconds
Makes use of the DHCP snooping database and static ip source binding entries. If enabled - switch will test addresses

35. What types of links can be trunked?
If the switch or the powered device doesn't suport power class discovery
CEF is distributed completely among multiple L3 forwarding engines.
1 second. Backup routers can learn the interval from the master
FE - GE - and aggregated FE/GE Etherchannels

36. What is a community secondary VLAN?
Globally or per-port
Lowest cumulative cost to root
Root - designated - alternate - and backup
Hosts within a secondary can communicate with each other and with the primary - but not with another secondary vlan

37. What can the Etherchannel hash use?
Data and voice over native vlan no QOS and no 802.1p trunk
1 IP subnet
Source IP - dest IP - combination of source and dest IP - source and dest MAC - or TCP/UDP port numbers
1- inferior BDPU on blocked-considered alternative - 2-inferior on root-all blocked ports considered alternate - 3-if inferior arrives on root and no blocked ports - assumes loss of connectivity to root

38. What does MSTP consist of?
Regions and instances
By short-circuiting the max age timer
Root - designated - alternate - and backup
Globally

39. What is jitter?
Admin down
From the DHCP snooping database or from static entries
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.
Variation in delay

40. What are the VRRP group and priority numbers?
The number of times the entry has been updated since the table was generated
Time between BDPUs sent by root bridge. Default of 2 seconds
Group (0-255) - priority (1-254 254 is highest - 100 default)
Port with best root path cost on segment

41. What is a proxy arp?

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

42. What is the IEEE standard for STP?
Controls where candidate root bridges can be connected and found on a network
802.1D
7 switches from root bridge
TCAM

43. the static port to vlan membership is handled in _____
A client can roam to any WLC as long as it stays in a mobility group
The ASIC
Roughly 50%
Frames are forwarded

44. What scope is 802.1x enabled?
Needs hardware upgrade over WEP - uses AES encryption
Globally
To the virtual port-channel interface
Port is forced to never authorize any connected client

45. What is DSCP codepoint AF21(18)?
The number of times the CEF table has bee flushed and regenerated as a whole
All ARP packets that arrive on untrusted ports are inspected.
Allows devices to interoperate with PVST and CST. Can use both dot1q and ISL
Immediate (class 2)

46. What is unique about HSRP group numbers?
The topology is pre-populated by downloading the topology DB into the FIB and dynamically updated. Called Cisco Express Forwarding
They are locally significant on an interface. HSRP1 on one VLAN is different from HSRP1 on another
CEF is distributed completely among multiple L3 forwarding engines.
0-255

47. How many links can be used in an EtherChannel?
SC fiber or RJ-45
2-8 FE - GE - or 10GE are bundled.
Within a single MST region - an IST instances runs to work out a loop free topology between links where CST meets the region boundary and all switches in the region. It runs at the boundary.
L2

48. CAM table entries are purged when....
300 sec
A MAC is seen on a different port
Based on priority (0-255). Default is 100. Highest IP is tie breaker
Best effort delivery - integrated services model - and differentiated services model

49. How should backbonefast be configured?
The port will operate under 802.1D rules. If they are received on the same port - it will run 802.1D until the migration delay expires
The configureable UDLD interval must be less than max age plus two intervals of forward delay
BGP - EIGRP - OSPF - and IS-IS.
On all switches in network to enable RLQ request and reply

50. How should the switch port to which an autonomous AP be configured?
1500B
The frame tag contains a 3 but portion tagged from 0 (low) to 7 (high)
Trunk
Configure the timer on the AVG and let it propagate