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. Where is root guard enabled?

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

2. 802.11a
Using a single WAP to centralize access and control over a group of wireless devices.
Up to 54Mbps - not cross-compatible - 12 to 23 clean channels - 5.8 Ghz
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
Globally or per-port

3. Which fiber is the receive?
Globally
Yes
On the left as you face the connector
By sending a gratuitous ARP

4. How doed backbonefast work?
Frames that barely exceed 1518B or 1622B due to headers
All nondesignated ports - but ok for all ports
By short-circuiting the max age timer
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

5. How many tunnels exist between the LAP and WLC?
When a wireless station transmits a frame - the receiving one must send an ack
All ARP packets that arrive on untrusted ports are inspected.
Enables portfast - sets the port to access and disables PAgP
2 - one for control messages and one for data

6. What does DTP do?
Switchpotrt nonegotiate
Time between BDPUs sent by root bridge. Default of 2 seconds
Automatically negotiates a common trunk mode between switches
If a proposal is received - the recipient isolates - all nonedge ports blocked until proposal sent causing neighbors to synch - which propagates out in waves

7. What is 802.1x force-authorized?
The time that a port spends in both listening and learning states . Default 15 seconds
Low cost - high density ports - multiple scalable uplinks - vlans - traffic and protocol filtering and QoS
The port is forced to always authorize any connected client with no authentication necessary (default)
Best effort delivery - integrated services model - and differentiated services model

8. What is UDLD aggressive mode?

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

9. What is the cost of a 10Gbps link?
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
Port stays up - but packets from violating MACs are dropped. Switch logs violating packets
2
19

10. How are frames forwarded across a specific link?
The number of STP instances needed ot support the desired topologies and whether to map a set of VLANs to each instance
Hashing algorithm
The frame tag includes a 3 bit COS value from 0 (low) to 7 (high). Native vlans are untagged so no COS
Cisco ILP and 802.3af

11. What is Per VLAN STP (PVST)?
Once the CCM gives them the parameters - they use RTP
Single instance of STP for all VLANs. BDPUs are sent over trunks using the native VLAN with untagged frames. Dot1q based
Receives the first packet of a traffic flow and routes it
Cisco proprietary. 1 instance of STP/VLAN. Requires ISL instead of dot1q

12. What is the adjacency table?
A router keeps a routing table and an ARP table. The FIB combines them for every next-hop entry
Switch(config-if)# vrrp xx where xx= group number
Incoming frames dropped - but MACs learned
1-(opt) configure load balancing - 2-select the interface(s) - 3-assign the protocol - 4-select the mode and submode

13. What is the DIFS?
Trunk
4
1-(opt) configure load balancing - 2-select the interface(s) - 3-assign the protocol - 4-select the mode and submode
The DCF interframe space- the random backoff time before a wireless set can transmit

14. What types of link can an etherchannel be?
Access or trunk
Priority (class 1)
Reboots and searches for a new WLC
When the AP uplinks to an Ethernet network.

15. RSTP learning state
No
Incoming frames dropped - but MACs learned
5 classes with 3 drop precedences
Normal and aggressive

16. How do you implement MST?

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

17. Does GLBP allow preemption?
Yes
1-(opt) configure load balancing - 2-select the interface(s) - 3-assign the protocol - 4-select the mode and submode
On by default
One that can be detected on a switch interface (ie. Up/down)

18. What are the steps to configure a PAgP port channel?
1-(opt) configure load balancing - 2-select the interface(s) - 3-assign the protocol - 4-select the mode and submode
The number of STP instances needed ot support the desired topologies and whether to map a set of VLANs to each instance
The topology is pre-populated by downloading the topology DB into the FIB and dynamically updated. Called Cisco Express Forwarding
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

19. Whan is a 10GE WAN PHY?
From the DHCP snooping database or from static entries
Connects with SONET or SDH
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
Root

20. What is the size of ISL encapsulation?
Immediate (class 2)
26-byte header - 4-byte trailer with CRC
Virtual Router Redundancy Protocol - pretty much the same as HSRP
Routers at the distribution layer become the bottlenecks or broadcast or multicast traffic slows the switches in the switch block

21. By default - what submode does PAgP operate in with the desirable and auto modes?
10-15%
Silent
Used when there are 1 or more VLANs mapped to a single STP instance
Port that connects to another switch and becomes a designated port

22. What are the 5 STP port roles?
When a client roams between Aps in different subnets
Automatically using DTP and CDP
From the DHCP snooping database or from static entries
Root - designated - blocking - alternate - forwarding (host)

23. WEP encryption
Weak key rotation
Used to switch packets destined for the null interface
1 per segment
Isl - dot1q - negotiate (default)

24. What are the two private vlan association modes?
LACP port priority
Causes switch to actively determine whether alternative paths exist to root bridge in case ther eis an indirect failure
Promiscuous and host
Incoming frames dropped - but MACs learned

25. How is a QoS trust bondary configured?
Every switch and router in a network must be configured with appropriate QoS features and policies
Port with redundant - but less deisrable connection to a segment. Possibly root candidate
If a unidirectional link is detected - the port continues normally - but the port is marked as undetermined and a syslog is generated
Source IP - dest IP - combination of source and dest IP - source and dest MAC - or TCP/UDP port numbers

26. How does IPT behave when the voce VLAN is in the default none mode?
Data and voice over native vlan no QOS and no 802.1p trunk
Up to 54Mbps - not cross-compatible - 12 to 23 clean channels - 5.8 Ghz
1 per segment
Access

27. what do multilayer switches do?
The MST instance (MSTI) runs alongside the IST and represents an STP instance
Using digital certificates
Roughly 2000
Both layer 2 switching and IVR

28. 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
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
10-15%
Flash (class 3)

29. How much overlap should WAPs have?
Trunk
10-15%
802.1x with EAP over LAN (EAPOL)
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.

30. How is the IPT 802.1 trunk negotiated?
Almost eliminates listening and learning states for single hosts on an access link
26-byte header - 4-byte trailer with CRC
Auto mode
Automatically using DTP and CDP

31. what I s distributed CEF (dCEF)?
1/2 and 3/6
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
CEF is distributed completely among multiple L3 forwarding engines.
Port with best root path cost on segment

32. What is the PVLAN promiscuous mode?
Compatible with 802.11b - up to 54Mbps in 12 data rates - 3 channels - 2.4Ghz
Will trunk if asked
Connects to a router - firewall - or gateway. Can communicate with anything else connected to the primary or any secondary. Ignores pvlan config
Configure and enable DHCP snooping

33. can root guard and bdpu guard be used together?
Protects STP when a physical malfunction only allows traffic in 1 direction - even though the link shows as up (cisco proprietary)
2 strand MMF with MT-RJ or SC connectors
802.1D
No

34. How does an LAP bind with a WLC?
By brining up a tunnel between them to carry 802.11 related messages and client data.
CEF is distributed completely among multiple L3 forwarding engines.
LWAPP (Cisco proprietary) and CAP-WAP (standards based)
Switchpotrt nonegotiate

35. What is DSCP codepoint AF21(18)?
Should be used on access switches - can't be used on root - keeps enabled switch from becoming root by raising priority of switch and all ports - making them undesirable
Host Standby Router protocol. Cisco proprietary. Switch is either active - standby - or listen
The frame tag contains a 3 but portion tagged from 0 (low) to 7 (high)
Immediate (class 2)

36. What are the 3 unlicensed frequencies?
Only a single host connects . If one BDPU is received - it is no longer an edge port
900 MHz - 2.4Ghz - and 5-6GHz
Yes to both
To the virtual port-channel interface

37. How much overlap should a wireless repeater have?
MAC of the end device
Only on ports that have same static VLANs or trunking. It also modifies parameters of the channel if one of the ports is modified
Roughly 50%
With portfast

38. How does ILP do power discovery?
By sending a gratuitous ARP
Sends a test tone on the transmit pair. If a device is detected - CDP is used to narrow down the power class.
802.11
Weak key rotation

39. static vlans offer ____ based membership
Notifies upstream neighbors by sending multicasts on behalf of hosts at the interval of the max update rate parameter.
Port
Globally
0-255

40. What is an MST instance?
Multicasts to 224.0.0.18 (VRRP)
The MST instance (MSTI) runs alongside the IST and represents an STP instance
Half-duplex
1- trunking mode - 2-trunk encapsulation - 3-native VLAN - 4-allowed VLAN

41. What are the RSTP port roles?
All ports where root isn't expected
Route processor redundancy - redundant sup is partially booted and initialized and must reload module in the switch and init all sup functions
Root - designated - alternate - and backup
By brining up a tunnel between them to carry 802.11 related messages and client data.

42. How is an instance defined?
An L2 switch can only forward frames best effort unless going across a trunk
By name - config revision - and instance to vlan mapping table
Checks the sender's ip in all arp requests and checks the sender's IP against target IP in all replies
Roughly 2000

43. What are the 2 power over ethernet methods?
Cisco ILP and 802.3af
A path is pre-arranged for priority along the complete path from source to destination using the RSVP protocol.
All nondesignated ports - but ok for all ports
Normal and aggressive

44. Does a WLC and a LAP need to be on the same subnet?
No
Untrusted
Connects with SONET or SDH
Stateful switchover - redundant sup is fully booted and init'd. Both start and run config are synched as is L2 information - and switchinterfaces.

45. How does every HSRP config command begin?
0000.5e00.01xx
First configure a L3 interface in same VLAN as clients - then use the ip helper-address command to ID the DHCP server
Only a single host connects . If one BDPU is received - it is no longer an edge port
Switch(config-if)# standby xx where x= group number

46. What does the reload keyword do in HSRP?
Change in trunk encap
Controls where candidate root bridges can be connected and found on a network
Forces the router to wait for a period of time after the switch is reloaded before attempting to overthrow
Gets assistance from other NSF-aware neighbors. NSF features need to be built into the routing protocols on router needing and providing assistance

47. What is accelerated CEF (aCEF)?
The topology is pre-populated by downloading the topology DB into the FIB and dynamically updated. Called Cisco Express Forwarding
CEF is distributed across multiple L3 forwarding engines - typically on Catalyst 6500 line cards each having only a subset
Root
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

48. When looking at the sh spanning tree output - What does P2P denote?
A point to point port type
By sending a gratuitous ARP
Immediate (class 2)
Sets the switchport mode to access - enables portfast - and turns off channel grouping for the port

49. How far chould a VLAN extend?
Distribution layer
80% of the user traffic should stay in the VLAN
Discarding - learning - forwarding
Src-dst-ip

50. What if RSTP BDPUs aren't received?
If three are missed in a row - the neighbor is considered down and the data for that neighbor is aged
Cisco ILP and 802.3af
Only a single host connects . If one BDPU is received - it is no longer an edge port
When the size of a cell is intentionally reduced