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. What is DSCP codepoint AF21(18)?
Auto mode
The switch adds its MAC to the option 82 field so that the DHCP reply echoes back the switch's own information
Immediate (class 2)
Causes switch to actively determine whether alternative paths exist to root bridge in case ther eis an indirect failure

2. RSTP designated port
Distributed coordinion function - the use of timers to prevent wireless collisions
1-lowest root bridge ID - 2-lowest root path cost - 3-lowest bridgeID - 4-lowest port ID
Low cost - high density ports - multiple scalable uplinks - vlans - traffic and protocol filtering and QoS
Port with best root path cost on segment

3. How does the CEF L3 engine operate?

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

4. What address does HSRP send hello packets to?
1 IP subnet
All fiber-optic links between switches (must be enabled on both ends)
The master router can share the VIP
224.0.0.2 (all routers)

5. What are spoofed addresses?
Either desirable or auto mode
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
Each frame transmits its expected duration time
They disguise the origin of an attack

6. What routing protocols support NSF?
Yes to both
Both layer 2 switching and IVR
BGP - EIGRP - OSPF - and IS-IS.
Yes

7. RSTP BPDU structure
Trusted ports
Some unused bits are used to allow a port to identify its role and state. Also the BDPUs state that they are V2 BDPUs
Source IP and MAC must match those addresses learned by DHCP snooping or a static entry
Routers are assigned to common GLBP group. All routers can be active and can load balance

8. What is accelerated CEF (aCEF)?
CEF is distributed across multiple L3 forwarding engines - typically on Catalyst 6500 line cards each having only a subset
Auto mode
Switch(config-if)# glbp xx where xx = group number
Root

9. What is the traditional MLS view of switching?
The number of STP instances needed ot support the desired topologies and whether to map a set of VLANs to each instance
Only on ports that have same static VLANs or trunking. It also modifies parameters of the channel if one of the ports is modified
Route once - switch many
An ac adaptor that plugs into a wall outlet.

10. What is an indirect topology change?
The link status stays up - but something between them has failed or is filtering traffic
The time interval that a switch stores a DBPU before discarding it. Default 20 seconds
No
A router keeps a routing table and an ARP table. The FIB combines them for every next-hop entry

11. How do you find duplex mismatches?
1- trunking mode - 2-trunk encapsulation - 3-native VLAN - 4-allowed VLAN
Local only
1-65535 (def 32768) lower priority - higher probability
Use sh interface on the interface and look for error counts > 10

12. How should UDLD be configured?
The configureable UDLD interval must be less than max age plus two intervals of forward delay
Port
Globally
1-(opt) set system priority - 2-select interface(s) - 3-assign the protocol - 4-set the mode - 5-(opt) set the port priority

13. What is the STP blocking state?
After another forwarding delay - the port can send and receive data frames - collect MAC addresses - and send and receove BDPUs
Can hear only BDPUs
With portfast
By creating a static IP binding

14. What do you need to determine to use MSTP?
Once the CCM gives them the parameters - they use RTP
Root
Time between BDPUs sent by root bridge. Default of 2 seconds
The number of STP instances needed ot support the desired topologies and whether to map a set of VLANs to each instance

15. In a converged fabric - which switch(es) send config BDPUs?
Root
Critical...used most often for IPT
When the AP uplinks to an Ethernet network.
RPR - RPR+ - and SSO

16. What is the bridge priority range?
1 IP subnet
Used to switch packets destined for the null interface
0-65535 (def 32768) lower=better
Configure non-silent submode

17. What is a LACP priority?
CEF is distributed completely among multiple L3 forwarding engines.
On all switches in network to enable RLQ request and reply
The priority is a 2 byte value followed by the MAC that decides which ports are actively participating in Etherchannel (lower=higher priority)
No

18. can root guard and bdpu guard be used together?
They should be an unconditional Etherchannel because the WLC can't negotiate a channel.
Differentiated services
No
Connects with SONET or SDH

19. How is root port decided upon?
Lowest cumulative cost to root
MAC of the end device
Isl - dot1q - negotiate (default)
SC fiber or RJ-45

20. Does VTP pass private VLAN configuration?
No
An instance of RSTP running for each VLAN on the switch. Changing from PVST to RPVST+ is disruptive
Used to switch packets destined for the null interface
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

21. How often are CAM table entries aged?
300 sec
Priority (class 1)
By creating a static IP binding
Switching Database Manager - configures and prunes TCAM partitions

22. How does every GLBP command begin
When the AP uplinks to an Ethernet network.
Source IP and MAC must match those addresses learned by DHCP snooping or a static entry
Switch(config-if)# glbp xx where xx = group number
Prevents the dhcp binding DB from being checked.

23. What is an end to end vlan?
Yes
A VLAN that spans the entire fabric
Port with best root path cost
Every hello interval regardless of whether BDPUs are received from root - allowing any switch to take an active role maintaining the topology

24. What types of ports autonegotiate?
The frame tag contains a 3 but portion tagged from 0 (low) to 7 (high)
2
The switch checks the MAC and IP reported in the reply against trusted values. If they don't match - it is dropped and logged
FE and GE

25. How does an L2 switch do QOS?
Routers at the distribution layer become the bottlenecks or broadcast or multicast traffic slows the switches in the switch block
On (all ports channel) - auto (channels when asked) - and desirable(actively asks to form a channel)
The port asks the other end to trunk
An L2 switch can only forward frames best effort unless going across a trunk

26. can root guard and loop guard be used together
No
0-255
The distribution layer should have only L3 links
Option 43

27. What is DSCP codepoint AF11(10)?
Used when ACLs specify port ranges...used by TCAM
Nonstop forwarding is an interactive method focusing on rebuilding the RIB after SUP switchover
Priority (class 1)
The topology is pre-populated by downloading the topology DB into the FIB and dynamically updated. Called Cisco Express Forwarding

28. How does GLBP work?
Best effort delivery - integrated services model - and differentiated services model
By default weight is 100. Can be made dynamic per interface
Routers are assigned to common GLBP group. All routers can be active and can load balance
Using a single WAP to centralize access and control over a group of wireless devices.

29. How does the standby handle ARP issues after it becomes active?
By sending a gratuitous ARP
1-1005 (1 and 1002-1005 are reserved)
That they aren't using the same frequencies.
By creating a static IP binding

30. What format does the GLBP MAC use?
Between any type of interface as long as the interface can have an L3 address assigned
RADIUS
0007.b4xx.xxyy where xx.xx is six 0 bits followed by a 10-bit GLBP group numberr. Yyyy is the virtual forwarder number
Receives the first packet of a traffic flow and routes it

31. How are VACLs applied
To a VLAN and not to a VLAN interface (SVI)
Routers at the distribution layer become the bottlenecks or broadcast or multicast traffic slows the switches in the switch block
Reboots and searches for a new WLC
Frames are forwarded

32. Define GLBP
One that can be detected on a switch interface (ie. Up/down)
Gateway load balancing protocol - cisco proprietary
Half because transmitting and receiving stations use the same frequency
Only for the offending VLAN on the port

33. What does port-security protect do?
Configure and enable DHCP snooping
Access or trunk
Causes switch to actively determine whether alternative paths exist to root bridge in case ther eis an indirect failure
Port stays up - packets from violating MACs dropped - no logging

34. Where does VRRP send advertisements?
Determines when the AVG will stop using the old VMAC in ARP replies
A router keeps a routing table and an ARP table. The FIB combines them for every next-hop entry
Multicasts to 224.0.0.18 (VRRP)
Matching SSID - compatible data rate - authentication credentials

35. What is errdisable dtp-flap?
By configuring every switch port to have an expected and controlled behavior
Change in trunk encap
Distribution
802.1D

36. What are the 4 steps to extend QoS trust?
Causes switch to actively determine whether alternative paths exist to root bridge in case ther eis an indirect failure
Prevents the dhcp binding DB from being checked.
By creating a static IP binding
1- enable qos - 2-define qos parameters to be trusted - 3-make trust conditional - 4-instruct IP phone how to extnd boundary

37. What are the steps to configure a LACP port channel?
Use the spanning-tree root macro
By default weight is 100. Can be made dynamic per interface
Distribution
1-(opt) set system priority - 2-select interface(s) - 3-assign the protocol - 4-set the mode - 5-(opt) set the port priority

38. What are the characteristics of the distribution layer?
Route processor redundancy - redundant sup is partially booted and initialized and must reload module in the switch and init all sup functions
The point at which a switch decides to trust incoming Qos. Usually at boundary with ISP
Aggregation - high L3 throughput - security and policy based connectivity functions through access lists and packet filters - QoS - scalable high-speed links
Port is forced to never authorize any connected client

39. What is a root link query (RLQ)?
When the size of a cell is intentionally reduced
Limits the number if dhcp requests on a port
Backbonefast uses RLQ to determine if upstream switches have stable connections to root bridge
The point at which a switch decides to trust incoming Qos. Usually at boundary with ISP

40. What does the rewrite engine do?
Very high L3 throughput - no access lists or port filtering - redundancy and resilience - advanced QoS
It updates the L2 headers with the proper src and dst MAC - L3 TTL - L3 checksum - and L2 checksum information
The number of STP instances needed ot support the desired topologies and whether to map a set of VLANs to each instance
Immediate (class 2)

41. How do you show HSRP status
Each frame transmits its expected duration time
Critical...used most often for IPT
Show standby
If the switch or the powered device doesn't suport power class discovery

42. What is GLBP weight?
The priority is a 2 byte value followed by the MAC that decides which ports are actively participating in Etherchannel (lower=higher priority)
Regions and instances
By default weight is 100. Can be made dynamic per interface
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

43. Where is bdpu guard enabled?
Based on priority (0-255). Default is 100. Highest IP is tie breaker
All user ports that have portfast enabled
A packet can't be switched in hardware with the FIB and must go to the L3 engine
Only when a nonedge port transitions to forwarding

44. WPA2 encryption
Needs hardware upgrade over WEP - uses AES encryption
Sets the switchport mode to access - enables portfast - and turns off channel grouping for the port
The priority is a 2 byte value followed by the MAC that decides which ports are actively participating in Etherchannel (lower=higher priority)
The time interval that a switch stores a DBPU before discarding it. Default 20 seconds

45. By default - what submode does PAgP operate in with the desirable and auto modes?
2 strand MMF with MT-RJ or SC connectors
Dynamic arp inspection
Silent
Only for the offending VLAN on the port

46. What are the steps to configure a PAgP port channel?
Every hello interval regardless of whether BDPUs are received from root - allowing any switch to take an active role maintaining the topology
1-(opt) configure load balancing - 2-select the interface(s) - 3-assign the protocol - 4-select the mode and submode
Configuration and TCN
224.0.0.2 (all routers)

47. RSTP forwarding state
Disabled - blocking - listening - learning - forwarding
Transmits keystrokes from phone and commands from CCM
The port uses 802.1x exchange to move from unauthorized to authorized. Requires app on client
Frames are forwarded

48. can root guard and udld be used together?
On ports where you never expect to find a root bridge for a VLAN
No because they only participate if asked
Access or trunk
Yes

49. What is UDLD aggressive mode?

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

50. What are the 3 trunk switchport modes?
300 sec by default
Trunk - dynamic auto - dynamic desireable (default)
When a port moves into forwarding or from fowarding or learning to blocking.
Each peer sends and receives hellos. Def hello is 3 sec - def hold is 10 sec