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 are the port channel load balancing methods?
L2
Switch(config-if)# vrrp xx where xx= group number
Src-ip - dst-ip - src-dst-ip - src-mac - dst-mac - src-dst-mac - src-port - dst-port - src-dst-port
1500B

2. What is common spanning tree (CST)?
To a VLAN and not to a VLAN interface (SVI)
Single instance of STP for all VLANs. BDPUs are sent over trunks using the native VLAN with untagged frames. Dot1q based
With the skinny protocol
Low cost - high density ports - multiple scalable uplinks - vlans - traffic and protocol filtering and QoS

3. What must be supported for port-based security to occur?
802.1x with EAP over LAN (EAPOL)
Multicast to 01-80-c2-00-00-00
Manages addition - deletion and renaming VLANs across the network
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

4. How does DSCP handle IP precedence?
1-client sends DHCP discover as broadcast - 2-DHCP server sends DHCP offer - client sends DHCP Request - DHCP server sends DHCP ack
Normal and aggressive
5 classes with 3 drop precedences
Switch(config-if)# standby xx where x= group number

5. what must be done on an SVI before it is activated?
Can send and receive BDPUs
FE and GE
No shut
Tracks of BDPUs on nondesignated ports. When those BDPUs stop coming - the port is put into loop-inconsistent state and blocks

6. What types of link can an etherchannel be?
Low cost - high density ports - multiple scalable uplinks - vlans - traffic and protocol filtering and QoS
Access or trunk
FE and GE
If the client maintains the same IP address as it roams between Aps. All must have same VLAN - SSID - and subnet

7. Where should STP timers be configured and why?
Manually
With portfast
Checks the source MAC in the header against the sender MAC in the ARP reply
On root - because the root bridge propagates timers with config BDPU

8. What is DSCP codepoint AF41(34)?
No
Global config (vlan - vtp mode - and vtp domain) and VLAN DB mode commands. Global config is preferred because VLAN DB mode commands are legacy
Show standby
Flash override (class 4)

9. What is the adjacency table?
A router keeps a routing table and an ARP table. The FIB combines them for every next-hop entry
The time that a port spends in both listening and learning states . Default 15 seconds
Distribution layer
When the AP uplinks to an Ethernet network.

10. What is an isolated secondary VLAN?

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

11. What is the default mode of load balancing?
Incoming frames dropped - but MACs learned
10-15%
Automatically negotiates a common trunk mode between switches
Src-dst-ip

12. What is a baby giant frame?
If the switch or the powered device doesn't suport power class discovery
Use sh interface on the interface and look for error counts > 10
Round robin - weighted - or host-dependent
Frames that barely exceed 1518B or 1622B due to headers

13. What does the epoch number indicate when looking at cef entries?
63 kbps
Only when a nonedge port transitions to forwarding
The number of times the CEF table has bee flushed and regenerated as a whole
Each physical interface has a different IP address. All physical interfaces point to a virtual interface called the standby address or VIP

14. What is the traditional MLS view of switching?
Isolated and community
By an ARP access list that defines the permitted bindings
Checks the source MAC in the header against the sender MAC in the ARP reply
Route once - switch many

15. How much overlap should WAPs have?
Manages addition - deletion and renaming VLANs across the network
10-15%
On all switches in network to enable RLQ request and reply
134 bits

16. What happens if both 802.1D and RSTP BDPUs are received?
No
Promiscuous and host
MST attributes must be manually entereed on each switch in the region. They don' t propagate like VTP.
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

17. What is a BSS?
Using a single WAP to centralize access and control over a group of wireless devices.
Trusted ports
Manages addition - deletion and renaming VLANs across the network
Packets must be sent to the L3 engine for further processing

18. How does HSRP gateway addressing work
Causes switch to actively determine whether alternative paths exist to root bridge in case ther eis an indirect failure
Each physical interface has a different IP address. All physical interfaces point to a virtual interface called the standby address or VIP
1-lowest root bridge ID - 2-lowest root path cost - 3-lowest bridgeID - 4-lowest port ID
Dynamic WEP keys that change periodically

19. How many virtual MACs can GLBP have?
Must be same type - speed - VLAN(s) - native vlan - pass the same set of vlans -duplex - and spanning tree settings
Host Standby Router protocol. Cisco proprietary. Switch is either active - standby - or listen
Some unused bits are used to allow a port to identify its role and state. Also the BDPUs state that they are V2 BDPUs
Up to 4 can be used in a group. Called active virtual forwarders (AVF)

20. What is the DIFS?
If a unidirectional link is detected - the port continues normally - but the port is marked as undetermined and a syslog is generated
The link status stays up - but something between them has failed or is filtering traffic
Root - designated - blocking - alternate - forwarding (host)
The DCF interframe space- the random backoff time before a wireless set can transmit

21. What is the VRRP skew time?
Cisco proprietary. 1 instance of STP/VLAN. Requires ISL instead of dot1q
Incoming frames are dropped (combination of disabled - blocking - and listening)
0000.0c07.acxx where xx is the group number as a 2-digit hex value
Hold time is 3xhello. A skew time of 256ms-routerpriority)/256ms is added

22. What criteria are used to size a switch block?
Configure and enable DHCP snooping
Traffic types and patterns - amount of L3 switching cap. At dist. Layer - # users at access layer - geography - size of spanning tree domains
Isolated and community
It is enabled by default on all CEF capable switches

23. What is the STP disabled state?
Trusted ports
A router keeps a routing table and an ARP table. The FIB combines them for every next-hop entry
Admin down
19

24. What is latency?
Limits the number if dhcp requests on a port
The total delay from start to finish
By configuring every switch port to have an expected and controlled behavior
Globally

25. Which 4 things must be agreeable to trunk?
Connects with SONET or SDH
1- trunking mode - 2-trunk encapsulation - 3-native VLAN - 4-allowed VLAN
Configure the timer on the AVG and let it propagate
Two distribution switches that aggregate one or more access switches

26. How does an LAP bind with a WLC?
From the DHCP snooping database or from static entries
By brining up a tunnel between them to carry 802.11 related messages and client data.
Automatically by duplex mode in use. Full duplex are point ot point. Half duplex ports use traditional 802.1D convergence is used.
63 kbps

27. Where should you change the network diameter value?
1 per segment
Cisco recommends only on the root bridge
On root - because the root bridge propagates timers with config BDPU
Port that connects to another switch and becomes a designated port

28. What is the standard for WLANs?
Used to switch packets that can't be forwarded normallly due to an encapsulation failure - unresolved address - unsupported protocol - etc.
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
Checks the destination MAC in the header against the target MAC in the ARP reply
802.11

29. How do you prevent switch spoofing?
224.0.0.2 (all routers)
Multicasts to 224.0.0.18 (VRRP)
By configuring every switch port to have an expected and controlled behavior
Global config (vlan - vtp mode - and vtp domain) and VLAN DB mode commands. Global config is preferred because VLAN DB mode commands are legacy

30. How does RSTP identify a topology change?
Only when a nonedge port transitions to forwarding
The station must wait until the frame in progress has completed - then wait a random amount of time before transmitting
They shorten their bridge table aging times from default (300sec) to the fowarding delay (15 sec)
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

31. On what scope is DAI enabled?
Configure the timer on the AVG and let it propagate
Show standby
Distributed coordinion function - the use of timers to prevent wireless collisions
Per VLAN

32. What are the characteristics of the access layer?
Access or trunk
134 bits - consisting of source and destination addresses and protocol information from the packet or frame
On the left as you face the connector
Low cost - high density ports - multiple scalable uplinks - vlans - traffic and protocol filtering and QoS

33. What is the default VTP state?
134 bits - consisting of source and destination addresses and protocol information from the packet or frame
VTP server for domain null with no password or secure mode
The number of times the entry has been updated since the table was generated
1- trunking mode - 2-trunk encapsulation - 3-native VLAN - 4-allowed VLAN

34. When a host is connected to a switchport - why aren't frame errors propagated?
A point to point port type but the neighboring device runs traditional 802.1D STP
VTP server for domain null with no password or secure mode
Switched Virtual Interface - an L3 address can be assigned to a logical interface that represents an entire VLAN - which becomes the DGW for that VLAN
Because each frame is checked

35. What is a vlan?
Real-time Transport Protocol
A single broadcast domain
Full duplex
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

36. How many 802.3af power classes are there?
Auto mode
Globally
5 (0-4 with 4 being the highest)
Configure the timer on the AVG and let it propagate

37. How does backbonefast determine whether alternative paths exist?
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
Automatically by duplex mode in use. Full duplex are point ot point. Half duplex ports use traditional 802.1D convergence is used.
16 - of which up to 8 are active. The others are in standby
MST attributes must be manually entereed on each switch in the region. They don' t propagate like VTP.

38. What is a QoS trust boundary?
Disabled - blocking - listening - learning - forwarding
The switch adds its MAC to the option 82 field so that the DHCP reply echoes back the switch's own information
The point at which a switch decides to trust incoming Qos. Usually at boundary with ISP
0-65535 (def 32768) lower=better

39. What is the range of PAgP channel group numbers?
No
RPR - RPR+ - and SSO
L2
1 to 64

40. How is an RSTP edge port configured
Time between BDPUs sent by root bridge. Default of 2 seconds
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
Access or trunk
With portfast

41. What are the 3 RSTP port types?
The distribution layer should have only L3 links
Edge - root - and point to point
The DCF interframe space- the random backoff time before a wireless set can transmit
Globally

42. How does UDLD work?
Configure non-silent submode
Sends a test tone on the transmit pair. If a device is detected - CDP is used to narrow down the power class.
Sends special layer 2 UDLD frames and expects an echo. Both ends must be configured for UDLD
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.

43. How do you configure LACP standby links?
Each physical interface has a different IP address. All physical interfaces point to a virtual interface called the standby address or VIP
An ac adaptor that plugs into a wall outlet.
Used when there are 1 or more VLANs mapped to a single STP instance
LACP port priority

44. 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
The number of STP instances needed ot support the desired topologies and whether to map a set of VLANs to each instance
Configure and enable DHCP snooping
The ASIC

45. Does VTP pass private VLAN configuration?
No
Stateful switchover - redundant sup is fully booted and init'd. Both start and run config are synched as is L2 information - and switchinterfaces.
Full duplex
Data and voice over native vlan no QOS and no 802.1p trunk

46. When are RSTP bdpus sent?
Hold time is 3xhello. A skew time of 256ms-routerpriority)/256ms is added
Every hello interval regardless of whether BDPUs are received from root - allowing any switch to take an active role maintaining the topology
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.
Needs hardware upgrade over WEP - uses AES encryption

47. What are the 5 steps to manualy configure STP?
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
TCAM
Src-dst-ip
The ASIC

48. 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

49. What is best effort delivery QOS?
Switches make an effort to move packets as quickly as possible
That they aren't using the same frequencies.
Differentiated services code point
Frames are forwarded

50. How often are HSRP hellos sent?
They should be an unconditional Etherchannel because the WLC can't negotiate a channel.
Needs hardware upgrade over WEP - uses AES encryption
Limits the number if dhcp requests on a port
3 seconds. Holdtime =3 hellos + 1