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 AF11(10)?
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
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
Priority (class 1)
The TOS field in the header is used. 2 methods 3 bits or 6 bits

2. How is a WLC handoff handled when the WLCs are in different subnets?
By using an Ether-IP tunnel
BGP - EIGRP - OSPF - and IS-IS.
0000.0c07.acxx where xx is the group number as a 2-digit hex value
The frame tag includes a 3 bit COS value from 0 (low) to 7 (high). Native vlans are untagged so no COS

3. What types of authentication does HSRP allow?
Plain text or md5
Port with best root path cost on segment
Round robin - weighted - or host-dependent
Configure non-silent submode

4. Which fiber is the receive?
1 -2 -5.5 and 11 Mbps - Channels 1/6/11 - 2.4Ghz
1/2 and 3/6
On the left as you face the connector
A group of wireless devices that share a common SSID

5. What is DSCP codepoint AF21(18)?
The master router can share the VIP
Using digital certificates
The station must wait until the frame in progress has completed - then wait a random amount of time before transmitting
Immediate (class 2)

6. How is Root Guard used?
On ports where you never expect to find a root bridge for a VLAN
Port that connects to another switch and becomes a designated port
Routers at the distribution layer become the bottlenecks or broadcast or multicast traffic slows the switches in the switch block
Port with alternative path to root less desirable than root

7. What is the IEEE standard for STP?
Gets assistance from other NSF-aware neighbors. NSF features need to be built into the routing protocols on router needing and providing assistance
802.1D
Sends a test tone on the transmit pair. If a device is detected - CDP is used to narrow down the power class.
300 sec

8. What does Loop Guard do?
LACP port priority
Tracks of BDPUs on nondesignated ports. When those BDPUs stop coming - the port is put into loop-inconsistent state and blocks
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
Only a single host connects . If one BDPU is received - it is no longer an edge port

9. For QoS - switch uplinks should always be considered as ____ _____?
With the skinny protocol
Trusted ports
Used when there are 1 or more VLANs mapped to a single STP instance
Use sh interface on the interface and look for error counts > 10

10. How do you configure IP source guard for hosts that don't use DHCP?
RPR - RPR+ - and SSO
On all switches in network to enable RLQ request and reply
By creating a static IP binding
An instance of RSTP running for each VLAN on the switch. Changing from PVST to RPVST+ is disruptive

11. How does DAI work?
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
Critical...used most often for IPT
All ARP packets that arrive on untrusted ports are inspected.
Immediate (class 2)

12. What is the STP blocking state?
Limits the number if dhcp requests on a port
Root
A packet can't be switched in hardware with the FIB and must go to the L3 engine
Can hear only BDPUs

13. What does the switchport host macro do?
Enables portfast - sets the port to access and disables PAgP
Embeds the tag within the frame
2
Gateway load balancing protocol - cisco proprietary

14. What routing protocols support NSF?
BGP - EIGRP - OSPF - and IS-IS.
1/2 and 3/6
No
Manages addition - deletion and renaming VLANs across the network

15. What is a CEF punt?

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

16. What does BDPU filtering do?
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
All fiber-optic links between switches (must be enabled on both ends)
Port with alternative path to root less desirable than root
Effectively stops STP on filtered ports

17. What is the size of ISL encapsulation?
26-byte header - 4-byte trailer with CRC
Trunk
5 (0-4 with 4 being the highest)
802.1D

18. RSTP root port
Almost eliminates listening and learning states for single hosts on an access link
Real-time functions such as beacons and probes - encryption and interactions with the client at L2
Nonstop forwarding is an interactive method focusing on rebuilding the RIB after SUP switchover
Port with best root path cost

19. At what layer should the WLC be connected?
Traffic types and patterns - amount of L3 switching cap. At dist. Layer - # users at access layer - geography - size of spanning tree domains
If three are missed in a row - the neighbor is considered down and the data for that neighbor is aged
1-1005 (1 and 1002-1005 are reserved)
Distribution

20. What is RPR?
Because each frame is checked
Route processor redundancy - redundant sup is partially booted and initialized and must reload module in the switch and init all sup functions
Access or trunk
Hashing algorithm

21. What are the 2 power over ethernet methods?
224.0.0.2 (all routers)
1-client sends DHCP discover as broadcast - 2-DHCP server sends DHCP offer - client sends DHCP Request - DHCP server sends DHCP ack
Cisco ILP and 802.3af
Silent

22. What must be in common for a BSS to form?
Yes
Matching SSID - compatible data rate - authentication credentials
Embeds the tag within the frame
The switch checks the MAC and IP reported in the reply against trusted values. If they don't match - it is dropped and logged

23. What is a root link query (RLQ)?
Backbonefast uses RLQ to determine if upstream switches have stable connections to root bridge
Yes
By using a trunk link
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

24. if the switchport is part of an etherchannel - Where is the network assigned
1 -2 -5.5 and 11 Mbps - Channels 1/6/11 - 2.4Ghz
Once the CCM gives them the parameters - they use RTP
To the virtual port-channel interface
Up to 4 can be used in a group. Called active virtual forwarders (AVF)

25. How do you renable an err-disable port by default?
Manually
Configuration and TCN
Yes
The MST instance (MSTI) runs alongside the IST and represents an STP instance

26. What is differentiated services model QOS?
Host Standby Router protocol. Cisco proprietary. Switch is either active - standby - or listen
Switch(config-if)# standby xx where x= group number
Any dhcp reply coming from an untrusted port is discarded and the offending port is put in errdisable
Each network device handles packets individually with no advance reservations

27. How do you prevent VLAN hopping?
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
Globally
Two distribution switches that aggregate one or more access switches
By using an Ether-IP tunnel

28. What is step 1 of enabling IP source guard?
Value - mask - and result (VMR) combinations
No
Configure and enable DHCP snooping
Packets are discarded due to an ACL or policy action

29. 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

30. What are the three basic types of QOS?
Best effort delivery - integrated services model - and differentiated services model
1/2 and 3/6
All ARP packets that arrive on untrusted ports are inspected.
2-8 FE - GE - or 10GE are bundled.

31. By default - what layer do catalyst switchports operate on?
FE - GE - and aggregated FE/GE Etherchannels
Auto mode
L2
Immediate (class 2)

32. what must be done on an SVI before it is activated?
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
Flash (class 3)
No shut
A VLAN that spans the entire fabric

33. What are the PAgP negotiation modes
0-65535 (def 32768) lower=better
On (all ports channel) - auto (channels when asked) - and desirable(actively asks to form a channel)
L2
A VLAN that spans the entire fabric

34. How do you configure DAI for statically configured IP addresses?
By an ARP access list that defines the permitted bindings
By using a hash of a key string
Weak key rotation
Round robin - weighted - or host-dependent

35. What is the VRRP master router?
Prevents the dhcp binding DB from being checked.
Normal and aggressive
Port with alternative path to root less desirable than root
The active router. All other routers are in backup state

36. What is the range of HSRP group numbers?
1-lowest root bridge ID - 2-lowest root path cost - 3-lowest bridgeID - 4-lowest port ID
Sends a voltage across the receive pairs to detect a 25k ohm resistance
Bridge priority and MAC
0-255

37. Define GLBP
Gateway load balancing protocol - cisco proprietary
Flash (class 3)
Used when ACLs specify port ranges...used by TCAM
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

38. How does a Cisco IP phone connect upstream?
The total delay from start to finish
A point to point port type
Via an 802.1Q trunk or a single VLAN access port
Incoming frames are dropped (combination of disabled - blocking - and listening)

39. Which 4 things must be agreeable to trunk?
They are locally significant on an interface. HSRP1 on one VLAN is different from HSRP1 on another
1- trunking mode - 2-trunk encapsulation - 3-native VLAN - 4-allowed VLAN
With the skinny protocol
Automatically by duplex mode in use. Full duplex are point ot point. Half duplex ports use traditional 802.1D convergence is used.

40. How does backbonefast determine whether alternative paths exist?
0-255 (lower is better)
Makes use of the DHCP snooping database and static ip source binding entries. If enabled - switch will test addresses
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
MST attributes must be manually entereed on each switch in the region. They don' t propagate like VTP.

41. How does RSTP identify a topology change?
Port that connects to another switch and becomes a designated port
An L2 switch can only forward frames best effort unless going across a trunk
On root - because the root bridge propagates timers with config BDPU
Only when a nonedge port transitions to forwarding

42. How does HSRP do MD5 authentication?
Forces the router to wait for a period of time after the switch is reloaded before attempting to overthrow
The priority is a 2 byte value followed by the MAC that decides which ports are actively participating in Etherchannel (lower=higher priority)
By using a hash of a key string
Isl - dot1q - negotiate (default)

43. What is a microcell?
Source IP - dest IP - combination of source and dest IP - source and dest MAC - or TCP/UDP port numbers
Arp for local subnet - if on different subnet - will arp for dgw
When the size of a cell is intentionally reduced
By an ARP access list that defines the permitted bindings

44. What is the standard for WLANs?
A path is pre-arranged for priority along the complete path from source to destination using the RSVP protocol.
Used when there are 1 or more VLANs mapped to a single STP instance
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
802.11

45. What is unique about HSRP group numbers?
When a port moves into forwarding or from fowarding or learning to blocking.
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
They are locally significant on an interface. HSRP1 on one VLAN is different from HSRP1 on another
Configure and enable DHCP snooping

46. What is the GLBP redirect timer?
Switching Database Manager - configures and prunes TCAM partitions
A port can only forward or relay BDPUs - but can't receive them - disabled by default - enabled per-port - blocks port when superior BDPUs are received
2 seconds (def)
Determines when the AVG will stop using the old VMAC in ARP replies

47. What is UDLD normal mode?
63 kbps
If a unidirectional link is detected - the port continues normally - but the port is marked as undetermined and a syslog is generated
12 kbps with headers and compression
Cisco recommends only on the root bridge

48. RSTP alternate port
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
Port with alternative path to root less desirable than root
900 MHz - 2.4Ghz - and 5-6GHz
Cisco recommends only on the root bridge

49. What is the switch block?
1-1005 (1 and 1002-1005 are reserved)
Using digital certificates
Globally
Two distribution switches that aggregate one or more access switches

50. What is a proxy arp?

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